maven 搭建 ssm

前面我们用maven 搭建 springmvc+spring,今天我们再来添加一个持久化框架mybatis(前面也建过mybatis的helloworld),做一个查user信息的小项目

一 用maven来构建

1 构建方法参考 (换上项目对象模型配置文件就可以了pom.xml)

http://blog.youkuaiyun.com/onewby/article/details/78582477

2 p上项目架构,构建后补补一下包

这里写图片描述

3 数据库部分

//建数据库
create database springmvc;
//建表
CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(10) DEFAULT NULL,
  `password` varchar(10) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
//插入数据
INSERT INTO `springmvc`.`user`
(`id`,
`username`,
`password`)
VALUES
(1,'wby','123456')

4 web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
    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_2_5.xsd">
    <!--spring ioc 容器随web一起启动-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
    <listener>
        <listener-class>
            org.springframework.web.context.ContextLoaderListener
        </listener-class>
    </listener>
    <!--
    springmvc的默认配置文件是放在WEB-INF下的,叫action-servlet.xml
    想改在resources下,那么就得修改web.xml下的分发器的servlet,具体如下:
    -->
    <servlet>
        <servlet-name>action</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>action</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

5 applicationContext.xml配置文件

<?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:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
    <!--spring 管理业务逻辑组件-->
    <context:component-scan base-package="com.wby">
        <!--除去控制器,交由Springmvc配置文件-->
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller" />
    </context:component-scan>
   <!--数据源 采用c3p0-->
   <context:property-placeholder location="classpath:dbconfig.properties" />
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
        <property name="driverClass" value="${jdbc.driverClass}"></property>
        <property name="user" value="${jdbc.user}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>
    <!--事物管理-->
    <bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <!-- 开启基于注解的事务 -->
    <tx:annotation-driven transaction-manager="dataSourceTransactionManager"/>
    <!--整合mybatis-->
    <!--为了service 层能够调用 dao层下接口,现有如下配置-->
    <!--@Autowired-->
    <!--private UserMapper userMapper;-->
    <!--public List<User> getUser(){-->
    <!--return userMapper.getUser();-->
    <!--}-->
    <!---->
    <!--创建sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <!-- 指定mybatis-config.xml全局配置文件的位置 -->
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>
        <!-- 指定mapper文件的位置-->
        <property name="mapperLocations" value="classpath:mapper/*.xml"></property>
    </bean>
<!--扫描所有的mapper,让他们可以注入进来-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.wby.dao"  />
    </bean>
</beans>

6 springmvc.xml配置文件

<?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:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-4.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--控制网站跳转逻辑-->
    <!--只扫描控制器-->
    <context:component-scan base-package="com.wby" use-default-filters="false">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller" />
    </context:component-scan>
    <!--处理动态资源等-->
    <mvc:annotation-driven/>
    <!--处理静态资源-->
    <mvc:default-servlet-handler/>
    <!--视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <property name="prefix" value="/WEB-INF/pages/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

7 mybatis-config.xml 配置文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
 PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
 "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <settings>
        <!--开启驼峰命名-->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
        <setting name="jdbcTypeForNull" value="NULL"/>

        <setting name="lazyLoadingEnabled" value="true"/>
    </settings>

    <!--<databaseIdProvider type="DB_VENDOR">-->
        <!--<property name="MySQL" value="mysql"/>-->
        <!--<property name="Oracle" value="oracle"/>-->
        <!--<property name="SQL Server" value="sqlserver"/>-->
    <!--</databaseIdProvider>-->

</configuration>

8 entity(domain,ben)层 先建一user.java实体

package com.wby.entity;
/**
 * Created by Administrator on 2017/11/25.
 */
public class User {
    private int id;
    private String username;
    private String password;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
}

9 dao层

package com.wby.dao;
import java.util.List;
import com.wby.entity.User;
/**
 * Created by Administrator on 2017/11/25.
 */
public interface UserMapper {
    public  List<User> getUser();
}

10 **dao层下接口的映射文件 ***mapper.xml(相当于daoimpl) UserMapper.xml

<?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.wby.dao.UserMapper">
    <!--public List<User> getUser();-->
    <select id="getUser" resultType="com.wby.entity.User">
        select * from user
    </select>
</mapper>

11 service 层

package com.wby.service;

import com.wby.dao.UserMapper;
import com.wby.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
/**
 * Created by Administrator on 2017/11/25.
 */
@Service
public class UserService {
   @Autowired
   private UserMapper userMapper;
    public List<User> getUser(){
        return userMapper.getUser();
    }

}

12 controller层

package com.wby.controller;
import com.wby.entity.User;
import com.wby.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import java.util.List;
import java.util.Map;
/**
 * Created by Administrator on 2017/11/25.
 */
@Controller
public class UserController {
    @Autowired
    UserService userService;
    @RequestMapping("/index.html")
    public String emps( Map<String,Object> map){
        List<User> users = userService.getUser();
        map.put("users", users);
        return "main";
    }
}

dbconfig.properties

jdbc.jdbcUrl=jdbc:mysql://localhost:3306/springmvc
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.user=root
jdbc.password=root

pom.xml

<?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.wby</groupId>
    <artifactId>ssm</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>


<dependencies>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>4.3.12.RELEASE</version>
    </dependency>


    <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>4.3.12.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-aspects -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aspects</artifactId>
        <version>4.3.12.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>4.3.12.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>4.3.12.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>4.3.12.RELEASE</version>
    </dependency>



    <!-- https://mvnrepository.com/artifact/jstl/jstl -->
    <dependency>
        <groupId>jstl</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.4.2</version>
    </dependency>


    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>1.3.1</version>
    </dependency>

    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.41</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/com.mchange/c3p0 -->
    <dependency>
        <groupId>com.mchange</groupId>
        <artifactId>c3p0</artifactId>
        <version>0.9.5.2</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>4.0.0</version>
        <scope>provided</scope>
    </dependency>

</dependencies>


</project>

二 建议

2.1.0采用tomcat 9.0莫名的问题,换为tomcat8.0莫名地解决

2.1.1百度了一下 maven ssm 404 ,查到说路径问题,前前后后看了百余变发现路径没问题啊

2.1.2WEB-INF 里面的.jsp不能直接访问,只能通过controller来控制访问,我认了,可我有一个index.jsp 就在webapp下也不给我访问…连localhost:8080也不给

emmm…如果出现此类问题先检查是否出现2.1.1,2.1.2,这样类似的情况么。。。若实在没有就换tomcat8 试试。

三 运行结果
这里写图片描述

这里写图片描述

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