JavaEE_Mybatis_SpringMVC_整合開發_lesson2_Mapper代理開發方式

百度雲：Myeclipse2014項目(包括資料庫表和資料)

http://pan.baidu.com/s/1i4ij4Kt

上接lessson1,SSM架構整合, 原始Dao開發

本例展示如何使用Mapper代理的開發方式，開發SSM（Spring Springmvc Mybaits）

主要内容包括

1.SqlMapConfig.xml (Mybatis配置檔案)

2.application-Context.xml (SpringMVC配置檔案)

3.User.java(JavaBean)

4.UserMapper.java(接口類)     /   UserMapper.xml(接口實作)

5.Mapper測試類  UserMapperTest.java 利用Junit 進行測試

項目的目錄結構

1.SqlMapConfig.xml (Mybatis配置檔案)

<?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></settings> -->
	<typeAliases>
		<!--單個起别名的方法-->
		<!-- <typeAlias type="cn.itcast.mybatis.po.User" alias="user"/>  -->
		
		<!-- 批量定義别名 -->
		<package name="cn.itcast.ssm.po"/>
	</typeAliases>

	<mappers>
		<!-- 原始Dao開發方式，提供xml檔案 -->
		<mapper resource="sqlmap/User.xml" />
		<!-- <mapper resource="mapper/UserMapper.xml"/> -->
		<!-- <mapper class="cn.itcast.mybatis.mapper.UserMapper"/> -->
		
		<!-- Mybatis的包掃描器: 由Spring管理後, 在Spring中進行配置 -->
		<!--<package name="cn.itcast.ssm.mapper" />  -->
	</mappers>
</configuration>           

2.application-Context.xml (Spring配置檔案)

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 
		http://www.springframework.org/schema/beans/spring-beans-3.2.xsd 
		http://www.springframework.org/schema/mvc 
		http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd 
		http://www.springframework.org/schema/context 
		http://www.springframework.org/schema/context/spring-context-3.2.xsd 
		http://www.springframework.org/schema/aop 
		http://www.springframework.org/schema/aop/spring-aop-3.2.xsd 
		http://www.springframework.org/schema/tx 
		http://www.springframework.org/schema/tx/spring-tx-3.2.xsd ">

	<!-- 加載配置檔案 -->
	<context:property-placeholder location="classpath:db.properties" />

	<!-- 資料源，使用dbcp -->
	<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>

	<!-- sqlSessinFactory -->
	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<!-- 加載mybatis的配置檔案 -->
		<property name="configLocation" value="mybatis/SqlMapConfig.xml" />
		<!-- 資料源 -->
		<property name="dataSource" ref="dataSource" />
	</bean>
	
	<!-- 原始dao接口 -->
	<bean id="userDao" class="cn.itcast.ssm.dao.UserDaoImpl">
		<property name="sqlSessionFactory" ref="sqlSessionFactory"/>
	</bean>
	
	<!-- Mapper代理的開發方式 -->
	<!--  -->
	<bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
		<!--mapperInterface 指定mapper接口  -->
		<property name="mapperInterface" value="cn.itcast.ssm.mapper.UserMapper"/>
		<property name="sqlSessionFactory" ref="sqlSessionFactory"/>
	</bean>
	
	<!-- Spring的包掃描器 -->
	<!-- 
	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
		<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
		<property name="basePackage" value="cn.itcast.ssm.mapper"/>
	</bean>
	 -->
</beans>            

注意事項：

<!-- Spring的包掃描器 -->  org.mybatis.spring.mapper.MapperScannerConfigurer

<!-- mapper批量掃描,從mapper保重掃描出mapper接口，自動建立代理對象在Spring中注冊 -->

<!-- 這裡必須使用sqlSessionFactoryBeanName,若用sqlSessionFactory -->

<!-- 會 在context:property-placeholder元件之前加載，導緻db.properties讀取失敗 -->

3.User.java(JavaBean)

package cn.itcast.ssm.po;

import java.util.Date;
import java.util.List;

//hibernate字段名和屬性名相對應
public class User {
	@Override
	public String toString() {
		return "User [id=" + id + ", username=" + username + ", birthday="
				+ birthday + ", sex=" + sex + ", address=" + address + "]";
	}

	private int id;
	private String username;
	private Date birthday;
	private String sex;
	private String address;

	// 使用者的訂單商品資訊
	List<Orders> orderlist;

	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 Date getBirthday() {
		return birthday;
	}

	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}

	public String getSex() {
		return sex;
	}

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

	public String getAddress() {
		return address;
	}

	public void setAddress(String address) {
		this.address = address;
	}

	// 使用者的訂單商品資訊
	public List<Orders> getOrderlist() {
		return orderlist;
	}

	public void setOrderlist(List<Orders> orderlist) {
		this.orderlist = orderlist;
	}
}
           

4.UserMapper.java(接口類)     /   UserMapper.xml(接口實作)

UserMapper.java(接口類

package cn.itcast.ssm.mapper;

import java.util.List;

import cn.itcast.ssm.po.User;
import cn.itcast.ssm.po.UserCustom;
import cn.itcast.ssm.po.UserQueryVo;

public interface UserMapper {

	User findUserById(Integer id) throws Exception;

	List<UserCustom> findUserList(UserQueryVo userQueryVo) throws Exception;

	Integer findUserCount(UserQueryVo userQueryVo) throws Exception;

	User findUserByIdResultMap(Integer id) throws Exception;

	public List<User> findUserByName(String name) throws Exception;

	void insertUser(User user) throws Exception;

	void deleteUser(int id) throws Exception;

}
           

 UserMapper.xml(接口實作)

<?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">

<!-- namespace命名空間，作用就是對sql進行分類化管理，了解sql隔離 
注意：使用mapper代理方法開發，namespace有特殊重要的作用-->
<mapper namespace="cn.itcast.ssm.mapper.UserMapper">

	<resultMap type="User" id="userResultMap">
		<id column="_id" property="id"/>
		<result column="_username" property="username"/>
	</resultMap>

	<sql id="query_user_where">
		<if test="userCustom!=null">
			<if test="userCustom.sex!=null and userCustom.sex!=''">
				AND user.sex = #{userCustom.sex}
			</if>
			<if test="userCustom.username!=null and userCustom.username!=''">
				AND user.username like'%${userCustom.username}%'
			</if>
		</if>
	</sql>

	<!-- 通過OGNL的方式進行擷取 -->
	<select id="findUserList" parameterType="cn.itcast.ssm.po.UserQueryVo"
		resultType="cn.itcast.ssm.po.UserCustom">
		SELECT * FROM user
		<!-- where 可以自動去掉第一個and -->
		<where>
			<include refid="query_user_where"></include>
			<if test="ids!=null">
				<!--
				 使用foreach周遊傳入的ids
				 collection:指定輸入對象中的集合屬性
				 item:每個便利的對象
				 open:開始周遊拼接的串
				 close:結束周遊拼接的串
				 separator:周遊的兩個對象中需要拼接的串
				 -->
				<foreach collection="ids" item="id" open="AND user.id IN (" close=")" separator=",">
					#{id}
				</foreach>
			</if>
		</where>
	</select>

	<select id="findUserCount" parameterType="cn.itcast.ssm.po.UserQueryVo"
		resultType="int">
		SELECT COUNT(*) FROM user WHERE user.sex = #{userCustom.sex} AND
		user.username like'%${userCustom.username}%'
		<!-- where 可以自動去掉第一個and -->
		<where>
			<include refid="query_user_where"></include>
		</where>
	</select>
	
	<select id="findUserByIdResultMap" parameterType="java.lang.Integer" resultMap="userResultMap">
	 	SELECT id _id, username _username FROM user where id = #{id} 
	</select>
	

	 <!-- cn.itcast.mybatis.po.User -->
	 <select id="findUserById" parameterType="java.lang.Integer" resultType="user">
	 	SELECT * FROM user where id = #{id} 
	 </select>
	 
	 
	 <select id="findUserByName" parameterType="java.lang.String" resultType="cn.itcast.ssm.po.User">
	 	SELECT * FROM user where username like '%${value}%'
	 </select>
	 
	 
	 <insert id="insertUser" parameterType="cn.itcast.ssm.po.User">
	 	<selectKey keyProperty="id" order="AFTER" resultType="java.lang.Integer">
	 		SELECT LAST_INSERT_ID()
	 	</selectKey>
	 	INSERT INTO user(username,birthday,sex,address) VALUES(#{username},#{birthday},#{sex},#{address}) 
	 	<!-- 
		使用mysql的uuid（）生成主鍵
		執行過程：
		首先通過uuid()得到主鍵，将主鍵設定到user對象的id屬性中
		其次在insert執行時，從user對象中取出id屬性值
		 -->
		<!--  <selectKey keyProperty="id" order="BEFORE" resultType="java.lang.String">
			SELECT uuid()
		</selectKey>
		insert into user(id,username,birthday,sex,address) value(#{id},#{username},#{birthday},#{sex},#{address}) -->
	 </insert>


	<delete id="deleteUser" parameterType="java.lang.Integer">
		DELETE FROM user WHERE id=#{id}
	</delete>
	 
	 
	<update id="updateUser"	parameterType="cn.itcast.ssm.po.User">
		UPDATE user SET username=#{username},birthday=#{birthday},sex=#{sex},address=#{address} 
		WHERE id=#{id}
	</update>
	 
</mapper>           

5.Mapper測試類  UserMapperTest.java 利用Junit 進行測試

package cn.itcast.ssm.mapper;

import java.util.List;

import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import cn.itcast.ssm.po.User;

public class UserMapperTest {

	private ApplicationContext applicationContext;

	// 此方法是在執行testFindUserById之前執行
	@Before
	public void setUp() throws Exception {
		applicationContext = new ClassPathXmlApplicationContext(
				"classpath:spring/applicationContext.xml");
	}

	@Test
	public void testFindUserById() throws Exception {
		UserMapper userMapper = (UserMapper) applicationContext
				.getBean("userMapper");

		// applicationContext.getAliases(arg0)

		User user = userMapper.findUserById(1);
		System.out.println(user);
	}

	@Test
	public void testFindUserByName() throws Exception {
		UserMapper userMapper = (UserMapper) applicationContext
				.getBean("userMapper");

		List<User> userList = userMapper.findUserByName("小");
		System.out.println(userList);

	}

	@Test
	public void testInsertUser() throws Exception {
		UserMapper userMapper = (UserMapper) applicationContext
				.getBean("userMapper");

		User user = new User();
		user.setUsername("haha");
		userMapper.insertUser(user);
	}

	@Test
	public void testDeleteUser() throws Exception {
		UserMapper userMapper = (UserMapper) applicationContext
				.getBean("userMapper");

		userMapper.deleteUser(40);
	}
}
           

測試結果：