Maven高级应用与实践-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_40301475/article/details/114289545

maven

maven高级应用
maven基础知识回顾

maven高级应用

maven基础回顾
maven传统的web工程做一个数据查询
maven工程拆分与聚合的思想
把第二阶段做好的web工程修改成maven拆分与聚合的形式
私服-远程仓库
如何安装第三方jar包。（把第三方jar包安装到本地仓库，把第三方jar包安装到私服）

maven基础知识回顾

maven是一个项目管理工具。
依赖管理：maven对项目中jar包的管理过程。传统工程我们直接把jar包放置在项目中。
maven工程真正的jar包放置在仓库中，项目中只用放置jar包的坐标。
仓库的种类：本地仓库，远程仓库（私服），中央仓库。
仓库之间的关系：当我们启动一个maven工程的时候，maven工程会通过pom文件中的jar包的坐标去本地仓库找对应的jar包。
默认情况下，如果本地仓库没有对应的jar包，maven工程会自动去中央仓库下载jar包到本地仓库。
在公司中，如果本地没有对应jar包，会先从私服下载jar包，
如果私服没有jar包，可以从中央仓库下载，也可以从本地上传。
一键构建：maven自身集成了tomcat插件。可以对项目进行编译，测试，打包，安装，发布等操作。
maven常用命令：clean，compile，test，package，install，deploy。
maven三套生命周期：清理生命周期，默认生命周期，站点生命周期。

案例

1. 数据库创建

创建程序对应的数据库


SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for `items`
-- ----------------------------
DROP TABLE IF EXISTS `items`;
CREATE TABLE `items` (
  `id` int(10) NOT NULL auto_increment,
  `name` varchar(20) default NULL,
  `price` float(10,0) default NULL,
  `pic` varchar(40) default NULL,
  `createtime` datetime default NULL,
  `detail` varchar(200) default NULL,
  PRIMARY KEY  (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of items
-- ----------------------------
INSERT INTO `items` VALUES ('1', '传智播客', '1000', null, '2018-03-13 09:29:30', '带我走上人生巅峰');
INSERT INTO `items` VALUES ('2', '黑马310', null, null, '2018-03-28 10:05:52', '插入测试');
INSERT INTO `items` VALUES ('3', '黑马307', '199', null, '2018-03-07 10:08:04', '插入测试');
INSERT INTO `items` VALUES ('7', '插入测试', null, null, null, null);
INSERT INTO `items` VALUES ('8', '插入测试', null, null, null, null);

2. 创建项目工程

打开IDEA创建maven项目
创建成功

3. 所需环境准备

web.xml文件中修改web配置文件头部声明，修改如下：

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
          http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0">

</web-app>

在pom.xml文件中导入jar包（ssm框架jar包导入）

黑马给的版本：

	<!-- 统一管理jar包版本 -->
	<properties>
		<spring.version>5.0.2.RELEASE</spring.version>
		<slf4j.version>1.6.6</slf4j.version>
		<log4j.version>1.2.12</log4j.version>
		<shiro.version>1.2.3</shiro.version>
		<mysql.version>5.1.6</mysql.version>
		<mybatis.version>3.4.5</mybatis.version>
		<spring.security.version>5.0.1.RELEASE</spring.security.version>
	</properties>

	<!-- 锁定jar包版本 -->
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework</groupId>
				<artifactId>spring-context</artifactId>
				<version>${spring.version}</version>
			</dependency>
			<dependency>
				<groupId>org.springframework</groupId>
				<artifactId>spring-web</artifactId>
				<version>${spring.version}</version>
			</dependency>
			<dependency>
				<groupId>org.springframework</groupId>
				<artifactId>spring-webmvc</artifactId>
				<version>${spring.version}</version>
			</dependency>
			<dependency>
				<groupId>org.springframework</groupId>
				<artifactId>spring-tx</artifactId>
				<version>${spring.version}</version>
			</dependency>
			<dependency>
				<groupId>org.springframework</groupId>
				<artifactId>spring-test</artifactId>
				<version>${spring.version}</version>
			</dependency>
			<dependency>
				<groupId>org.mybatis</groupId>
				<artifactId>mybatis</artifactId>
				<version>${mybatis.version}</version>
			</dependency>
		</dependencies>
	</dependencyManagement>

	<!-- 项目依赖jar包 -->
	<dependencies>
		<!-- spring -->
		<dependency>
			<groupId>org.aspectj</groupId>
			<artifactId>aspectjweaver</artifactId>
			<version>1.6.8</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-aop</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context-support</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-web</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-orm</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-beans</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-core</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-test</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-tx</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.12</version>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>${mysql.version}</version>
		</dependency>
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>javax.servlet-api</artifactId>
			<version>3.1.0</version>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>javax.servlet.jsp</groupId>
			<artifactId>jsp-api</artifactId>
			<version>2.0</version>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>jstl</groupId>
			<artifactId>jstl</artifactId>
			<version>1.2</version>
		</dependency>
		<!-- log start -->
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>${log4j.version}</version>
		</dependency>
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-api</artifactId>
			<version>${slf4j.version}</version>
		</dependency>
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-log4j12</artifactId>
			<version>${slf4j.version}</version>
		</dependency>
		<!-- log end -->
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis</artifactId>
			<version>${mybatis.version}</version>
		</dependency>
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis-spring</artifactId>
			<version>1.3.0</version>
		</dependency>
		<dependency>
			<groupId>c3p0</groupId>
			<artifactId>c3p0</artifactId>
			<version>0.9.1.2</version>
			<type>jar</type>
			<scope>compile</scope>
		</dependency>
		<dependency>
			<groupId>com.github.pagehelper</groupId>
			<artifactId>pagehelper</artifactId>
			<version>5.1.2</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.security</groupId>
			<artifactId>spring-security-web</artifactId>
			<version>${spring.security.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.security</groupId>
			<artifactId>spring-security-config</artifactId>
			<version>${spring.security.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.security</groupId>
			<artifactId>spring-security-core</artifactId>
			<version>${spring.security.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.security</groupId>
			<artifactId>spring-security-taglibs</artifactId>
			<version>${spring.security.version}</version>
		</dependency>
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid</artifactId>
			<version>1.0.9</version>
		</dependency>
	</dependencies>
	<!-- 添加tomcat7插件 -->
	<build>
		<plugins>
			<plugin>
				<groupId>org.apache.tomcat.maven</groupId>
				<artifactId>tomcat7-maven-plugin</artifactId>
				<version>2.2</version>
			</plugin>
		</plugins>
	</build>

补全文件夹
在main下补全java和resources文件夹，在src下创建test目录再创建java目录。

在这里插入图片描述

4. dao层代码编写

main.java下创建包com.xmx.domain，并在此目录下创建数据库表对应的实体类Items

package com.xmx.domain;
import java.util.Date;

/**
 * @author ：xumx
 * @date ：Created in 2021/3/5 16:40
 * @description：
 * @modified By：
 * @version:
 */
public class Items {
    private Integer id;
    private String name;
    private Double price;
    private String pic;
    private Date createtime;
    private String detail;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Double getPrice() {
        return price;
    }

    public void setPrice(Double price) {
        this.price = price;
    }

    public String getPic() {
        return pic;
    }

    public void setPic(String pic) {
        this.pic = pic;
    }

    public Date getCreatetime() {
        return createtime;
    }

    public void setCreatetime(Date createtime) {
        this.createtime = createtime;
    }

    public String getDetail() {
        return detail;
    }

    public void setDetail(String detail) {
        this.detail = detail;
    }
}

main.java下创建包com.xmx.dao，并在此目录下创建接口ItemsDao

package com.xmx.dao;

import com.xmx.domain.Items;

public interface ItemsDao  {
    public Items findById(Integer id);

}

在resources目录下创建com.xmx.dao文件夹。这里注意创建com.xmx.dao时使用com/xmx/dao如下图所示

在这里插入图片描述
并在此文件夹下创建一个ItemsDao.xml文件

ItemsDao.xml文件内容如下：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.xmx.dao.ItemsDao">
    <select id="findById" parameterType="int" resultType="items">
        select * from items where id = #{id}
    </select>
</mapper>

在resources目录下创建applicationContext.xml文件

applicationContext.xml文件内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
			    http://www.springframework.org/schema/beans/spring-beans.xsd
			    http://www.springframework.org/schema/context
			    http://www.springframework.org/schema/context/spring-context.xsd
			    http://www.springframework.org/schema/aop
			    http://www.springframework.org/schema/aop/spring-aop.xsd
			    http://www.springframework.org/schema/tx
			    http://www.springframework.org/schema/tx/spring-tx.xsd
			    http://www.springframework.org/schema/mvc
			    http://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <!--dao层配置文件开始-->

    <!--配置连接池-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql:///maven"/>
        <property name="username" value="root" />
        <property name="password" value="root" />

    </bean>

    <!--配置生产SqlSession对象的工厂-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <!--扫描pojo包，给包下所有pojo对象起别名-->
        <property name="typeAliasesPackage" value="com.xmx.domain"/>
    </bean>

    <!--扫描接口包路径，生成包下所有接口的代理对象，并且放入spring容器中 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.xmx.dao"/>
    </bean>
    <!--dao层配置文件结束-->

</beans>

在test.java.com.xmx.test下创建测试类ItemsTest

package com.xmx.test;

import com.xmx.dao.ItemsDao;
import com.xmx.domain.Items;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * @author ：xumx
 * @date ：Created in 2021/3/5 17:09
 * @description：
 * @modified By：
 * @version:
 */
public class ItemsTest {
    @Test
    public void findById(){
        //获取spring容器
        ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
        //从容器中拿到所需的dao的代理对象
        ItemsDao itemsDao = ac.getBean(ItemsDao.class);
        //调用方法
        Items items = itemsDao.findById(1);
        System.out.println(items.getName());

    }
}

5. service层代码编写

创建如下图所示文件

在这里插入图片描述

编写ItemsService文件

package com.xmx.service;

import com.xmx.domain.Items;

public interface ItemsService {
    public Items findById(Integer id);
}

编写ItemsServiceImpl文件

package com.xmx.service.impl;

import com.xmx.dao.ItemsDao;
import com.xmx.domain.Items;
import com.xmx.service.ItemsService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @author ：xumx
 * @date ：Created in 2021/3/5 19:15
 * @description：
 * @modified By：
 * @version:
 */
@Service
public class ItemsServiceImpl implements ItemsService {

    @Autowired
    private ItemsDao itemsDao;

    @Override
    public Items findById(Integer id) {
        return itemsDao.findById(id);
    }
}

编写applicationContext.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
			    http://www.springframework.org/schema/beans/spring-beans.xsd
			    http://www.springframework.org/schema/context
			    http://www.springframework.org/schema/context/spring-context.xsd
			    http://www.springframework.org/schema/aop
			    http://www.springframework.org/schema/aop/spring-aop.xsd
			    http://www.springframework.org/schema/tx
			    http://www.springframework.org/schema/tx/spring-tx.xsd
			    http://www.springframework.org/schema/mvc
			    http://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <!--dao层配置文件开始-->

    <!--配置连接池-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql:///maven"/>
        <property name="username" value="root" />
        <property name="password" value="root" />

    </bean>

    <!--配置生产SqlSession对象的工厂-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <!--扫描pojo包，给包下所有pojo对象起别名-->
        <property name="typeAliasesPackage" value="com.xmx.domain"/>
    </bean>

    <!--扫描接口包路径，生成包下所有接口的代理对象，并且放入spring容器中 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.xmx.dao"/>
    </bean>
    <!--dao层配置文件结束-->

    <!--service层配置文件开始-->

    <!--组件扫描配置-->
    <context:component-scan base-package="com.xmx.service" />

    <!--aop面向切面编程，切面就是切入点和通知的组合-->
    <!--配置事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" >
        <property name="dataSource" ref="dataSource" />
    </bean>
    <!--配置事务的通知-->
    <tx:advice id="advice">
        <tx:attributes>
            <tx:method name="save*" propagation="REQUIRED"/>
            <tx:method name="update*" propagation="REQUIRED"/>
            <tx:method name="delete*" propagation="REQUIRED"/>
            <tx:method name="find*" read-only="true"/>
            <tx:method name="*" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>

    <!--配置切面-->
    <aop:config>
        <aop:pointcut id="pointcut" expression="execution(* com.xmx.service.impl.*.*(..))"/>
        <aop:advisor advice-ref="advice" pointcut-ref="pointcut" />
    </aop:config>
    <!--service层配置文件结束-->

</beans>

resources文件下创建log4j.properties文件

# Set root category priority to INFO and its only appender to CONSOLE.
#log4j.rootCategory=INFO, CONSOLE            debug   info   warn error fatal
log4j.rootCategory=debug, CONSOLE, LOGFILE

# Set the enterprise logger category to FATAL and its only appender to CONSOLE.
log4j.logger.org.apache.axis.enterprise=FATAL, CONSOLE

# CONSOLE is set to be a ConsoleAppender using a PatternLayout.
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m\n

# LOGFILE is set to be a File appender using a PatternLayout.
log4j.appender.LOGFILE=org.apache.log4j.FileAppender
log4j.appender.LOGFILE.File=d:\axis.log
log4j.appender.LOGFILE.Append=true
log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout
log4j.appender.LOGFILE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m\n

编写测试文件test

package com.xmx.test;

import com.xmx.dao.ItemsDao;
import com.xmx.domain.Items;
import com.xmx.service.ItemsService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * @author ：xumx
 * @date ：Created in 2021/3/5 17:09
 * @description：
 * @modified By：
 * @version:
 */
public class ItemsTest {
    @Test
    public void findById(){
        //获取spring容器
        ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
        /*//dao测试
        //从容器中拿到所需的dao的代理对象
        ItemsDao itemsDao = ac.getBean(ItemsDao.class);
        //调用方法
        Items items = itemsDao.findById(1);
        System.out.println(items.getName());*/
        //service测试
        ItemsService itemsService = ac.getBean(ItemsService.class);
        //调用方法
        Items items = itemsService.findById(1);
        System.out.println(items.getName());

    }
}

5. web层代码编写

创建包com.xmx.controller

在这里插入图片描述

编写ItemsController类

package com.xmx.controller;

import com.xmx.domain.Items;
import com.xmx.service.ItemsService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * @Author Xumx
 * @Date 2021/3/6 19:42
 * @Version 1.0
 */

@Controller
@RequestMapping("/items")
public class ItemsController {

    @Autowired
    private ItemsService itemsService;

    @RequestMapping("/findDetail")
    public String findDetail(Model model){
        Items items = itemsService.findById(1);
        model.addAttribute("item",items);
        return "itemDetail";
    }
}

在resources文件下创建springmvc.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
			    http://www.springframework.org/schema/beans/spring-beans.xsd
			    http://www.springframework.org/schema/context
			    http://www.springframework.org/schema/context/spring-context.xsd
			    http://www.springframework.org/schema/aop
			    http://www.springframework.org/schema/aop/spring-aop.xsd
			    http://www.springframework.org/schema/tx
			    http://www.springframework.org/schema/tx/spring-tx.xsd
			    http://www.springframework.org/schema/mvc
			    http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--组件扫描-->
    <context:component-scan base-package="com.xmx.controller" />

    <!--处理器映射器，处理器适配器-->
    <mvc:annotation-driven />

    <!--视图解析器-->
    <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/" />
        <property name="suffix" value=".jsp" />
    </bean>

    <!--释放静态资源-->
    <mvc:default-servlet-handler/>

</beans>

在WEB-INF文件下创建pages目录，并在pages中创建itemDetail.jsp文件

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt"  prefix="fmt"%>    
 
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body> 
	<form>
		<table width="100%" border=1>
			<tr>
				<td>商品名称</td>
				<td> ${item.name } </td>
			</tr>
			<tr>
				<td>商品价格</td>
				<td> ${item.price } </td>
			</tr>
			<tr>
				<td>生成日期</td>
				<td> <fmt:formatDate value="${item.createtime}" pattern="yyyy-MM-dd HH:mm:ss"/> </td>
			</tr>
			<tr>
				<td>商品简介</td>
				<td>${item.detail} </td>
			</tr>
		</table>
	</form>
</body>
</html>

配置web.xml

<!DOCTYPE web-app PUBLIC
        "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
        "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
          http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0">

    <!--编码过滤器-->
    <filter>
        <filter-name>encoding</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encoding</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!--配置spring核心监听器-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <!--重新指定spring配置文件的路径-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>

    <!--springmvc的核心servlet-->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>


</web-app>

启动tomcat，输入网址http://localhost:8080/mavendemo1/items/findDetail

案例改进后

maven解决代码可重用和便于维护问题上是这么解决的：
maven把一个完整的项目，分成不同的独立模块，这些模块都有各自独立的坐标。哪个地方需要其中某个模块，就直接引用该模块的坐标即可。
今后如果公司开发一个新项目，我们先考虑的问题不是dao，service，utils，domain如何编写，我们要考虑的是dao，service，utils，domain这些模块是否已经存在，如果存在直接引用。
以上就是maven拆分的思想。
我们可以把拆分零散的模块聚合到一起编写一个完整的项目，这就是maven聚合思想。

1. maven父子工程创建

创建父工程maven_parent(不使用骨架创建)，删除项目下的src目录，

在这里插入图片描述

再创建子工程maven_dao(不使用骨架创建)，

在这里插入图片描述

创建子工程maven_service(不使用骨架创建)，

在这里插入图片描述

创建子工程maven_web(使用骨架创建)

在这里插入图片描述

删掉maven_web子工程的pom.xml文件中多余的代码

删除代码：

 <name>maven_web Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <finalName>maven_web</finalName>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.1.0</version>
        </plugin>
        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.8.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.22.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-war-plugin</artifactId>
          <version>3.2.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>

保留代码如下：

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.xmx</groupId>
  <artifactId>maven_web</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

 
</project>

在这里插入图片描述

2. 工程和模块之间的关系

工程和模块的区别：
工程不等于完整的项目，模块也不等于完整的项目，一个完整的项目看的是代码，代码完整，
就可以说这是一个完整的项目和此项目是工程和模块没有关系。

工程天生只能使用自己内部资源，工程天生是独立的。后天可以和其他工程或模块建立关联关系。
模块天生不是独立的，模块天生是属于父工程的，模块一旦创建，所有父工程的资源都可以使用。

父子工程之间，子模块天生集成父工程，可以使用父工程所有资源。
子模块天生是没有任何关系的。

父子工程之间不用建立关系，继承关系是先天的，不需要手动建立。

平级之间的引用叫依赖，依赖不是先天的，依赖需要后天建立的。

再maven_service工程的pom.xml中添加依赖

    <dependencies>
        <dependency>
            <groupId>com.xmx</groupId>
            <artifactId>maven_dao</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>

在这里插入图片描述

在maven_web的pom.xml文件中添加依赖

  <dependencies>
    <dependency>
      <groupId>com.xmx</groupId>
      <artifactId>maven_service</artifactId>
      <version>1.0-SNAPSHOT</version>
    </dependency>
  </dependencies>

在这里插入图片描述

在maven_parent的pom.xml文件中添加依赖

添加如下代码：

<!-- Í³Ò»¹ÜÀíjar°ü°æ±¾ -->
    <properties>
        <spring.version>5.0.2.RELEASE</spring.version>
        <slf4j.version>1.6.6</slf4j.version>
        <log4j.version>1.2.12</log4j.version>
        <shiro.version>1.2.3</shiro.version>
        <mysql.version>5.1.6</mysql.version>
        <mybatis.version>3.4.5</mybatis.version>
        <spring.security.version>5.0.1.RELEASE</spring.security.version>
        <maven.compiler.source>9</maven.compiler.source>
        <maven.compiler.target>9</maven.compiler.target>
    </properties>

    <!-- Ëø¶¨jar°ü°æ±¾ -->
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-web</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-tx</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-test</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis</artifactId>
                <version>${mybatis.version}</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <!-- ÏîÄ¿ÒÀÀµjar°ü -->
    <dependencies>
        <!-- spring -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.6.8</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <!-- log start -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>${log4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <!-- log end -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>${mybatis.version}</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.0</version>
        </dependency>
        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version>
            <type>jar</type>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>5.1.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-web</artifactId>
            <version>${spring.security.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-config</artifactId>
            <version>${spring.security.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-core</artifactId>
            <version>${spring.security.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-taglibs</artifactId>
            <version>${spring.security.version}</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.9</version>
        </dependency>
    </dependencies>
    <!-- Ìí¼Ótomcat7²å¼þ -->
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.2</version>
            </plugin>
        </plugins>
    </build>

添加完成后的代码：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.xmx</groupId>
    <artifactId>maven_parent</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>maven_dao</module>
        <module>maven_service</module>
        <module>maven_web</module>
    </modules>

    <!-- Í³Ò»¹ÜÀíjar°ü°æ±¾ -->
    <properties>
        <spring.version>5.0.2.RELEASE</spring.version>
        <slf4j.version>1.6.6</slf4j.version>
        <log4j.version>1.2.12</log4j.version>
        <shiro.version>1.2.3</shiro.version>
        <mysql.version>5.1.6</mysql.version>
        <mybatis.version>3.4.5</mybatis.version>
        <spring.security.version>5.0.1.RELEASE</spring.security.version>
        <maven.compiler.source>9</maven.compiler.source>
        <maven.compiler.target>9</maven.compiler.target>
    </properties>

    <!-- Ëø¶¨jar°ü°æ±¾ -->
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-web</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-tx</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-test</artifactId>
                <version>${spring.version}</version>
            </dependency>
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis</artifactId>
                <version>${mybatis.version}</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <!-- ÏîÄ¿ÒÀÀµjar°ü -->
    <dependencies>
        <!-- spring -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.6.8</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <!-- log start -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>${log4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <!-- log end -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>${mybatis.version}</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.0</version>
        </dependency>
        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version>
            <type>jar</type>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>5.1.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-web</artifactId>
            <version>${spring.security.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-config</artifactId>
            <version>${spring.security.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-core</artifactId>
            <version>${spring.security.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-taglibs</artifactId>
            <version>${spring.security.version}</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.9</version>
        </dependency>
    </dependencies>
    <!-- Ìí¼Ótomcat7²å¼þ -->
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.2</version>
            </plugin>
        </plugins>
    </build>
</project>

注意：
在这里插入图片描述

3. 在父子工程中填充代码

在maven_dao下创建两个包com.xmx.domain和com.xmx.dao。分别在两个包下创建对应的文件ItemsDao和Items如下图所示。在maven_dao下的resources目录下创建包（注意擦护功能键时使用com/xmx/dao）。在resources.com.xmx.dao目录下创建文件ItemsDao.xml。在resources目录下创建目录spring，并在spring目录下创建文件applicationContext_dao.xml。

在这里插入图片描述

Items代码：

package com.xmx.domain;
import java.util.Date;

/**
 * @author ：xumx
 * @date ：Created in 2021/3/5 16:40
 * @description：
 * @modified By：
 * @version:
 */
public class Items {
    private Integer id;
    private String name;
    private Double price;
    private String pic;
    private Date createtime;
    private String detail;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Double getPrice() {
        return price;
    }

    public void setPrice(Double price) {
        this.price = price;
    }

    public String getPic() {
        return pic;
    }

    public void setPic(String pic) {
        this.pic = pic;
    }

    public Date getCreatetime() {
        return createtime;
    }

    public void setCreatetime(Date createtime) {
        this.createtime = createtime;
    }

    public String getDetail() {
        return detail;
    }

    public void setDetail(String detail) {
        this.detail = detail;
    }
}

ItemsDao代码：

package com.xmx.dao;

import com.xmx.domain.Items;

public interface ItemsDao {
    public Items findById(Integer id);

}

resources下创建包：
在这里插入图片描述
ItemsDao.xml文件代码：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.xmx.dao.ItemsDao">
    <select id="findById" parameterType="int" resultType="items">
        select * from items where id = #{id}
    </select>
</mapper>

applicationContext_dao.xml文件代码：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
			    http://www.springframework.org/schema/beans/spring-beans.xsd
			    http://www.springframework.org/schema/context
			    http://www.springframework.org/schema/context/spring-context.xsd
			    http://www.springframework.org/schema/aop
			    http://www.springframework.org/schema/aop/spring-aop.xsd
			    http://www.springframework.org/schema/tx
			    http://www.springframework.org/schema/tx/spring-tx.xsd
			    http://www.springframework.org/schema/mvc
			    http://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <!--dao层配置文件开始-->

    <!--配置连接池-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql:///maven"/>
        <property name="username" value="root" />
        <property name="password" value="root" />

    </bean>

    <!--配置生产SqlSession对象的工厂-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <!--扫描pojo包，给包下所有pojo对象起别名-->
        <property name="typeAliasesPackage" value="com.xmx.domain"/>
    </bean>

    <!--扫描接口包路径，生成包下所有接口的代理对象，并且放入spring容器中 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.xmx.dao"/>
    </bean>
    <!--dao层配置文件结束-->

</beans>

在maven_service工程创建com.xmx.service和com.xmx.service.impl包。在com.xmx.service目录下创建文件ItemsService，在com.xmx.service.impl目录下创建文件ItemsServiceImpl。在resources目录下创建目录spring，并在spring目录下创建文件applicationContext_service.xml。

在这里插入图片描述

ItemsService文件代码：

package com.xmx.service;

import com.xmx.domain.Items;

public interface ItemsService {
    public Items findById(Integer id);
}

ItemsServiceImpl文件代码：

package com.xmx.service.impl;

import com.xmx.dao.ItemsDao;
import com.xmx.domain.Items;
import com.xmx.service.ItemsService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @author ：xumx
 * @date ：Created in 2021/3/5 19:15
 * @description：
 * @modified By：
 * @version:
 */
@Service
public class ItemsServiceImpl implements ItemsService {

    @Autowired
    private ItemsDao itemsDao;

    @Override
    public Items findById(Integer id) {
        return itemsDao.findById(id);
    }
}

applicationContext_service.xml文件代码：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
			    http://www.springframework.org/schema/beans/spring-beans.xsd
			    http://www.springframework.org/schema/context
			    http://www.springframework.org/schema/context/spring-context.xsd
			    http://www.springframework.org/schema/aop
			    http://www.springframework.org/schema/aop/spring-aop.xsd
			    http://www.springframework.org/schema/tx
			    http://www.springframework.org/schema/tx/spring-tx.xsd
			    http://www.springframework.org/schema/mvc
			    http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--配置连接池-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql:///maven"/>
        <property name="username" value="root" />
        <property name="password" value="root" />

    </bean>
    <!--service层配置文件开始-->

    <!--组件扫描配置-->
    <context:component-scan base-package="com.xmx.service" />

    <!--aop面向切面编程，切面就是切入点和通知的组合-->
    <!--配置事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" >
        <property name="dataSource" ref="dataSource" />
    </bean>
    <!--配置事务的通知-->
    <tx:advice id="advice">
        <tx:attributes>
            <tx:method name="save*" propagation="REQUIRED"/>
            <tx:method name="update*" propagation="REQUIRED"/>
            <tx:method name="delete*" propagation="REQUIRED"/>
            <tx:method name="find*" read-only="true"/>
            <tx:method name="*" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>

    <!--配置切面-->
    <aop:config>
        <aop:pointcut id="pointcut" expression="execution(* com.xmx.service.impl.*.*(..))"/>
        <aop:advisor advice-ref="advice" pointcut-ref="pointcut" />
    </aop:config>
    <!--service层配置文件结束-->

</beans>

在maven_web工程下创建包com.xmx.controller。在com.xmx.controller包下创建文件ItemsController。在resources目录下创建文件log4j.properties和springmvc.xml。在WEB-INF下创建文件夹pages并在其下创建文件itemDetail.jsp。修改WEB-INF下的web.xml文件。在resources目录下创建文件applicationContext.xml。

在这里插入图片描述

ItemsController文件代码：

package com.xmx.controller;

import com.xmx.domain.Items;
import com.xmx.service.ItemsService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * @Author Xumx
 * @Date 2021/3/6 19:42
 * @Version 1.0
 */

@Controller
@RequestMapping("/items")
public class ItemsController {

    @Autowired
    private ItemsService itemsService;

    @RequestMapping("/findDetail")
    public String findDetail(Model model){
        Items items = itemsService.findById(1);
        model.addAttribute("item",items);
        return "itemDetail";
    }
}

log4j.properties文件代码：

# Set root category priority to INFO and its only appender to CONSOLE.
#log4j.rootCategory=INFO, CONSOLE            debug   info   warn error fatal
log4j.rootCategory=debug, CONSOLE, LOGFILE

# Set the enterprise logger category to FATAL and its only appender to CONSOLE.
log4j.logger.org.apache.axis.enterprise=FATAL, CONSOLE

# CONSOLE is set to be a ConsoleAppender using a PatternLayout.
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m\n

# LOGFILE is set to be a File appender using a PatternLayout.
log4j.appender.LOGFILE=org.apache.log4j.FileAppender
log4j.appender.LOGFILE.File=d:\axis.log
log4j.appender.LOGFILE.Append=true
log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout
log4j.appender.LOGFILE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m\n

springmvc.xml文件代码：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
			    http://www.springframework.org/schema/beans/spring-beans.xsd
			    http://www.springframework.org/schema/context
			    http://www.springframework.org/schema/context/spring-context.xsd




			    http://www.springframework.org/schema/mvc
			    http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--组件扫描-->
    <context:component-scan base-package="com.xmx.controller" />

    <!--处理器映射器，处理器适配器-->
    <mvc:annotation-driven />

    <!--视图解析器-->
    <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/" />
        <property name="suffix" value=".jsp" />
    </bean>

    <!--释放静态资源-->
    <mvc:default-servlet-handler/>

</beans>

itemDetail.jsp文件代码：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt"  prefix="fmt"%>    
 
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body> 
	<form>
		<table width="100%" border=1>
			<tr>
				<td>商品名称</td>
				<td> ${item.name } </td>
			</tr>
			<tr>
				<td>商品价格</td>
				<td> ${item.price } </td>
			</tr>
			<tr>
				<td>生成日期</td>
				<td> <fmt:formatDate value="${item.createtime}" pattern="yyyy-MM-dd HH:mm:ss"/> </td>
			</tr>
			<tr>
				<td>商品简介</td>
				<td>${item.detail} </td>
			</tr>
		</table>
	</form>
</body>
</html>

修改后的web.xml文件代码：

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
          http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0">

  <!--编码过滤器-->
  <filter>
    <filter-name>encoding</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
    <init-param>
      <param-name>forceEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>encoding</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <!--配置spring核心监听器-->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <!--重新指定spring配置文件的路径-->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>

  <!--springmvc的核心servlet-->
  <servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>


</web-app>

applicationContext.xml文件代码：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
			    http://www.springframework.org/schema/beans/spring-beans.xsd
			    http://www.springframework.org/schema/context
			    http://www.springframework.org/schema/context/spring-context.xsd
			    http://www.springframework.org/schema/aop
			    http://www.springframework.org/schema/aop/spring-aop.xsd
			    http://www.springframework.org/schema/tx
			    http://www.springframework.org/schema/tx/spring-tx.xsd
			    http://www.springframework.org/schema/mvc
			    http://www.springframework.org/schema/mvc/spring-mvc.xsd">


    <import resource="classpath:spring/applicationContext_dao.xml" />
    <import resource="classpath:spring/applicationContext_service.xml" />
</beans>

4. maven父子工程三种启动方式

第一种启动方式

在这里插入图片描述

第二种启动方式：

注意：这里可能会出现找不到tomcat这时候需要在maven_web工程的pom.xml中添加依赖

<build>
    <plugins>
      <plugin>
        <groupId>org.apache.tomcat.maven</groupId>
        <artifactId>tomcat7-maven-plugin</artifactId>
        <version>2.2</version>
      </plugin>
    </plugins>
  </build>