ssm环境搭建

ssm入门环境搭建

ssm入门环境搭建源代码：https://download.youkuaiyun.com/download/zj20170916/10570672

1、jar包：31个jar包

2、web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>ssm</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  
  <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>
  
  <!-- 编码过滤器   POST  -->
  <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>
  </filter>
  
  <filter-mapping>
  	<filter-name>encoding</filter-name>
  	<url-pattern>/*</url-pattern>
  </filter-mapping>
   
  <!-- 配置前端控制器   -->
  <servlet>
  	  <servlet-name>springmvc</servlet-name>
  	  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<!--   	  配置文件 -->
  	  <init-param>
  	  	  <param-name>contextConfigLocation</param-name>
  	  	  <param-value>classpath:springmvc.xml</param-value>
  	  </init-param>
  </servlet>
  
  <servlet-mapping>
  	  <servlet-name>springmvc</servlet-name>
  	  <!-- 
  	    1: *.action *.do  拦截所有以.action .do结尾的请求       企业 后台开发  应用此种方式
  	    2: /*             拦截所有（包含.jsp .js .css .png.jpg...) 全拦截       企业不用
  	    3: /              拦截所有（包含.js .css .png .jpg) (不包含.jsp) 全拦截   另行 对静态资源放行配置  企业  前台应用使用此种 方式
  	   -->
  	  <url-pattern>*.action</url-pattern>
  </servlet-mapping>
  
</web-app>

其中classpath:applicationContext*.xml，*表示配置文件较多。由于将applicationContext文件进行分层，将dao层的放在applicationContext-dao.xml中，service放在applicationContext-service.xml中，

3、applicationContext-dao.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	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/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
	http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">

	<context:property-placeholder location="classpath:db.properties" />

	<!-- 数据库连接池 -->
	<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
		destroy-method="close">
		<property name="driverClassName" value="${jdbc.driver}" />
		<property name="url" value="${jdbc.url}" />
		<property name="username" value="${jdbc.username}" />
		<property name="password" value="${jdbc.password}" />
		<property name="maxActive" value="10" />
		<property name="maxIdle" value="5" />
	</bean>
	
	<!-- 配置SqlSessionFactory -->
	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<!-- 数据库连接池 -->
		<property name="dataSource" ref="dataSource" />
		<!-- 加载mybatis的全局配置文件 -->
		<property name="configLocation" value="classpath:mybatis/SqlMapConfig.xml" />
	</bean>
	
		<!-- 配置Mapper扫描 -->
	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
		<!-- 配置Mapper扫描包 -->
		<property name="basePackage" value="cn.zj.mapper" />
	</bean>
	
</beans>

dao一般处理数据源和数据库相关

4、db.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssm?characterEncoding=utf-8
jdbc.username=root
jdbc.password=root

5、SqlMapConfig.xml

<?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>

	<!--  别名    "cn.zj.pojo"  此包及其子包下所有  -->
	<typeAliases>
		<package name="cn.zj.pojo"/>
	</typeAliases>

</configuration>

6、applicationContext-service.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	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/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
	http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">

	<!-- 扫描@Service -->
	<context:component-scan base-package="cn.zj.service"/>
	
</beans>

7、applicationContext-trans.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	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/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
	http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">

	<!-- 事务管理器 -->
	<bean id="transactionManager"
		class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<!-- 数据源 -->
		<property name="dataSource" ref="dataSource" />
	</bean>

	<!-- 通知 -->
	<tx:advice id="txAdvice" transaction-manager="transactionManager">
		<tx:attributes>
			<!-- 传播行为 -->
			<tx:method name="save*" propagation="REQUIRED" />
			<tx:method name="insert*" propagation="REQUIRED" />
			<tx:method name="delete*" propagation="REQUIRED" />
			<tx:method name="update*" propagation="REQUIRED" />
			<tx:method name="find*" propagation="SUPPORTS" read-only="true" />
			<tx:method name="get*" propagation="SUPPORTS" read-only="true" />
			<tx:method name="query*" propagation="SUPPORTS" read-only="true" />
		</tx:attributes>
	</tx:advice>

	<!-- 切面 -->
	<aop:config>
		<aop:advisor advice-ref="txAdvice"
			pointcut="execution(* cn.zj.service.*.*(..))" />
	</aop:config>

</beans>

其中开启事务的有"save*"、"insert*"、"delete*"、"update*"方法，若有需要可另加。

execution为表达式，第一个*为返回值，表示所有；cn.zj.service为指定的包名；第二个*表示所有的类；第三个*表示类中的所有方法；..代表方法中所有参数

8、springmvc.xml

<?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:p="http://www.springframework.org/schema/p"
	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/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
        
	<!-- 扫描 -->
	<context:component-scan base-package="cn.zj.controller"/>
	
	<!-- 配置处理器映射器 -->
	<!-- <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"></bean> -->
	<!-- 处理器适配器 -->
	<!-- <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"></bean> -->
	<!--  配置处理器映射器 处理器适配器 -->
	<mvc:annotation-driven/>
	
	<!-- 视图解析器 -->
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<!-- 前缀 -->
		<property name="prefix" value="/WEB-INF/jsp/"/>
		<!-- 后缀 -->
		<property name="suffix" value=".jsp"/>
	</bean>
        
</beans>

9、ItemController.java

package cn.zj.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import cn.zj.pojo.Item;
import cn.zj.service.ItemService;

@Controller
public class ItemController{

	@Autowired
	private ItemService itemService;
	
	@RequestMapping(value = "/item/itemList.action")
	public ModelAndView itemList(){
		
		// 从Mysql数据库查询数据过来
		List<Item> list = itemService.findItemList();
		
		//Model 
		ModelAndView mav = new ModelAndView();
		//数据
		mav.addObject("itemList", list);
		//视图     
		mav.setViewName("itemList");
		return mav;
	}
}

10、ItemService.java

package cn.zj.service;

import java.util.List;

import cn.zj.pojo.Item;

public interface ItemService {
	
	//查询items 表所有数据
	public List<Item> findItemList();
	
}

11、ItemServiceImpl.java

package cn.zj.service;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import cn.zj.mapper.ItemsMapper;
import cn.zj.pojo.Item;

@Service
public class ItemServiceImpl implements ItemService {

	@Autowired
	private ItemsMapper itemsMapper;

	@Override
	public List<Item> findItemList() {
		return itemsMapper.findItemList();
	}
}

12、ItemsMapper.java

package cn.zj.mapper;

import java.util.List;

import cn.zj.pojo.Item;

public interface ItemsMapper {
	
	//查询items 表所有数据
	public List<Item> findItemList();

}

13、ItemsMapper.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">

<!-- 命名空间 接口代理开发开始 ：  将接口与Mapepr进行绑定  -->
<mapper namespace="cn.zj.mapper.ItemsMapper">
	
	<!-- //查询items 表所有数据 -->
	<select id="findItemList" resultType="Item">
		select * from items
	</select>
</mapper>

14、Item.java

package cn.zj.pojo;

import java.util.Date;

public class Item {
	// 商品id
	private int id; 
	// 商品名称
	private String name;
	// 商品价格
	private Float price;
	// 商品创建时间
	private Date createtime;
	// 商品描述
	private String detail;
    //get/set方法
    //有参无参构造器
}

15、建表sql语句，使用mysql

/*
Navicat MySQL Data Transfer

Source Server         : localhost_3306
Source Server Version : 50611
Source Host           : localhost:3306
Source Database       : springmvc

Target Server Type    : MYSQL
Target Server Version : 50611
File Encoding         : 65001

Date: 2018-07-29 11:45:13
*/

DROP DATABASE IF EXISTS ssm;

CREATE DATABASE ssm;

USE ssm;

SET FOREIGN_KEY_CHECKS=0;

-- ----------------------------
-- Table structure for items
-- ----------------------------
DROP TABLE IF EXISTS `items`;
CREATE TABLE `items` (
  `id` INT(11) NOT NULL AUTO_INCREMENT,
  `name` VARCHAR(32) NOT NULL COMMENT '商品名称',
  `price` FLOAT(10,1) NOT NULL COMMENT '商品定价',
  `detail` TEXT COMMENT '商品描述',
  `pic` VARCHAR(64) DEFAULT NULL COMMENT '商品图片',
  `createtime` DATETIME NOT NULL COMMENT '生产日期',
  PRIMARY KEY (`id`)
) ENGINE=INNODB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of items
-- ----------------------------
INSERT INTO `items` VALUES ('1', '台式机', '3000.0', '该电脑质量非常好！！！！', NULL, '2018-07-03 13:22:53');
INSERT INTO `items` VALUES ('2', '笔记本', '6000.0', '笔记本性能好，质量好！！！！！', NULL, '2018-07-09 13:22:57');
INSERT INTO `items` VALUES ('3', '背包', '200.0', '名牌背包，容量大质量好！！！！', NULL, '2018-07-06 13:23:02');

16、itemList.jsp

<%@ 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>查询商品列表</title>
</head>
<body>
	<form
		action="${pageContext.request.contextPath }/item/queryitem.action"
		method="post">
		查询条件：
		<table width="100%" border=1>
			<tr>
				<td><input type="submit" value="查询" /></td>
			</tr>
		</table>
		商品列表：
		<table width="100%" border=1>
			<tr>
				<td>商品名称</td>
				<td>商品价格</td>
				<td>生产日期</td>
				<td>商品描述</td>
				<td>操作</td>
			</tr>
			<c:forEach items="${itemList }" var="item">
				<tr>
					<td>${item.name }</td>
					<td>${item.price }</td>
					<td><fmt:formatDate value="${item.createtime}"
							pattern="yyyy-MM-dd HH:mm:ss" /></td>
					<td>${item.detail }</td>

					<td><a
						href="${pageContext.request.contextPath }/itemEdit.action?id=${item.id}">修改</a></td>
				</tr>
			</c:forEach>
		</table>
	</form>
</body>

</html>

17、启动服务器，浏览器地址输入

http://localhost:8080/ssm/item/itemList.action

18、异常1

Cause: java.lang.NoSuchMethodException: cn.zj.pojo.Item.<init>()

这是缺少无参构造器造成的，这发生在ItemsMapper.xml中

<!-- //查询items 表所有数据 -->
<select id="findItemList" resultType="Item">
    select * from items
</select>

在数据返回时出现的问题，从数据库中查到数据之后进行自动映射，在自动映射之前需要创建对象，此时创建的对象为无参构造器创建的，此时出现的问题