MyBatis——整合spring、springMVC、MyBatis框架

1 前言

在使用監聽器整合spring和springMVC 中介紹了spring 和 springMVC 框架的整合，本文將介紹 spring、springMVC、MyBatis 3個框架的整合（即SSM框架），主要思想是：將 springMVC 和 MyBatis 框架的部分配置交給 spring 容器管理。

spring、springMVC、MyBatis 的分工如下：

spring：負責 service、bean 等
springMVC：負責控制層，攔截器、MVC 驅動、視圖解析器等
MyBatis：負責 DAO 等

2 實驗環境

（1）導入 JAR 包

（2）工作目錄

注意：src 和 conf 目錄下的 com.mapper 包必須同名。

（3）數據庫

在 MySQL 中創建數據庫：users，再在此數據庫中創建表：students。

students 包含 sid（int）、sname（varchar）和 sex（varchar） 3個字段，其中，sid 設置了自增，students 表中數據如下：

3 實驗分析

（1）資源文件

log4j.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
 
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
 
	<appender name="STDOUT" class="org.apache.log4j.ConsoleAppender">
		<param name="Encoding" value="UTF-8" />
		<layout class="org.apache.log4j.PatternLayout">
			<param name="ConversionPattern" value="%-5p %d{MM-dd HH:mm:ss,SSS} %m (%F:%L)\n" />
		</layout>
	</appender>
 
	<logger name="java.sql">
		<level value="debug" />
	</logger>
 
	<logger name="org.apache.ibatis">
		<level value="info" />
	</logger>
 
	<root>
		<priority value="debug" />
		<appender-ref ref="STDOUT" />
	</root>
</log4j:configuration>

注意：log4j.xml文件名不能隨意更改，有時候也以 properties 文件的形式呈現。

jdbc.properties

# K = V
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/users?characterEncoding=UTF-8&allowMultiQueries=true
jdbc.username=root
jdbc.password=0.

（2）配置文件

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_3_0.xsd"
	version="3.0">

	<!-- 首頁網頁 -->
	<welcome-file-list>
		<welcome-file>/WEB-INF/view/index.jsp</welcome-file>
	</welcome-file-list>

	<!-- 配置CharacterEncodingFilter，用於解決後臺中文亂碼 -->
	<filter>
		<filter-name>characterEncodingFilter</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>characterEncodingFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

	<!-- 配置核心(前端)控制器 DispatcherServlet -->
	<servlet>
		<servlet-name>dispatcherServlet</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<!-- 加載IOC容器配置文件 -->
			<param-name>contextConfigLocation</param-name>
			<param-value>classpath:springMVC.xml</param-value>
		</init-param>
	</servlet>
	<servlet-mapping>
		<servlet-name>dispatcherServlet</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>

	<!-- 配置ContextLoaderListener需要的參數 -->
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:spring.xml</param-value>
	</context-param>

	<!-- 配置監聽器 -->
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
</web-app>

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:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
		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-4.0.xsd">	
	
	<!-- 掃描控制層組件 -->
	<context:component-scan base-package="com.controller"></context:component-scan>
	
	<!-- 配置視圖解析器 -->
 	<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/WEB-INF/view/"></property>
		<property name="suffix" value=".jsp"></property>
	</bean>
	
	<!-- 默認的servlet -->
	<mvc:default-servlet-handler/>
	
	<!-- MVC驅動 -->
	<mvc:annotation-driven/>
</beans>

spring.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: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/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">
 	
 	<!-- 掃描組件，不掃描控制層組件 -->
 	<context:component-scan base-package="com">
 		<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
 	</context:component-scan>
 	
	<!-- 引入屬性文件 -->
	<context:property-placeholder location="classpath:jdbc.properties"/>
 	
 	<!-- 創建數據源 -->
	<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
		<property name="driverClassName" value="${jdbc.driver}"></property>
		<property name="url" value="${jdbc.url}"></property>
		<property name="username" value="${jdbc.username}"></property>
		<property name="password" value="${jdbc.password}"></property>
	</bean>
	
	<!-- 配置事務管理器 -->
	<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<property name="dataSource" ref="dataSource"></property>
	</bean>
	
	<!-- 開啓註解驅動，即對事務相關的註解進行掃描，解析含義並執行功能 -->
	<tx:annotation-driven transaction-manager="transactionManager"/>
	
	<!-- 配置SqlSessionFactoryBean -->
	<bean class="org.mybatis.spring.SqlSessionFactoryBean">
		<property name="configLocation" value="classpath:mybatis.xml"></property>
		<property name="dataSource" ref="dataSource"></property>
	</bean>
	
	<!-- 在所設置的包下，給所有接口生成動態代理實現類，並由spring容器管理 -->
	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
		<property name="basePackage" value="com.mapper"></property>
	</bean>
</beans>

mybatis.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>
	<!-- 引入映射文件 -->
	<mappers>
		<package name="com.mapper"/>
	</mappers>
</configuration>

（3）JavaBean（Model）

Student.java

package com.bean;
 
public class Student {
	private Integer sid;
	private String sname;
	private String sex;
	
	public Integer getSid() {
		return sid;
	}
 
	public void setSid(Integer sid) {
		this.sid = sid;
	}
 
	public String getSname() {
		return sname;
	}
 
	public void setSname(String sname) {
		this.sname = sname;
	}

	public String getSex() {
		return sex;
	}

	public void setSex(String sex) {
		this.sex = sex;
	}
}

（4）視圖（View）

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!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>歡迎</title>
</head>
<body>
	<a href="getAll">顯示所有學生信息</a>
</body>
</html>

show.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<html>
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
	<title>顯示</title>
</head>
<body>
	<table>
		<tr>
			<th>學號</th>
			<th>姓名</th>
			<th>性別</th>		
		</tr>
		<c:forEach items="${list}" var="student">
			<tr>
				<td>${student.sid}</td>
				<td>${student.sname}</td>
				<td>${student.sex}</td>
			</tr>
		</c:forEach>		
	</table>
</body>
</html>

（5）映射文件（DAO）

StudentMapper.java

package com.mapper;

import java.util.List;
import com.bean.Student;

public interface StudentMapper {
    public List<Student> selectAll();
}

StudentMapper.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.mapper.StudentMapper" >
  <select id="selectAll" resultType="com.bean.Student" >
    select sid,sname,sex from students
  </select>
</mapper>

（6）服務層（Service）

StuService.java

package com.service;

import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.bean.Student;
import com.mapper.StudentMapper;

@Service
public class StuService {
	@Autowired
	private StudentMapper mapper;
	
	public List<Student> getStudents(){
		return mapper.selectAll();
	}
}

（7）控制層（Controller）

Test.java

package com.controller;

import java.util.List;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import com.bean.Student;
import com.service.StuService;

@Controller
public class Test {
	
	@Autowired
	private StuService service;
	
	@RequestMapping("getAll")
	public String getAll(Map<String,Object> map) {
		List<Student> list=service.getStudents();
		map.put("list", list);
		return "show";
	}
}

（8）運行結果

在地址欄中輸入：http://localhost:8080/SSM/，進入 index.jsp 頁面，如下：

點擊【顯示所有學生信息】超鏈接，進入 show.jsp 頁面，如下：

MyBatis——整合spring、springMVC、MyBatis框架

1 前言

2 實驗環境

3 實驗分析

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MyBatis——緩存機制

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