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MyBatis3.x与Spring4.x整合

作者:互联网

一、搭建开发环境
1.使用maven创建web项目
2.编辑pom.xml:
<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com</groupId>
  <artifactId>mybatis_spring_test</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>mybatis_spring_test Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <!-- <scope>test</scope> -->
    </dependency>
    
    <!-- 添加Spring-core包 -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>4.1.7.RELEASE</version>
    </dependency>
    <!-- 添加spring-context包 -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>4.1.7.RELEASE</version>
    </dependency>
    <!-- 添加spring-tx包 -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-tx</artifactId>
        <version>4.1.3.RELEASE</version>
    </dependency>
    <!-- 添加spring-jdbc包 -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>4.1.3.RELEASE</version>
    </dependency>
    <!-- 为了方便进行单元测试,添加spring-test包 -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-test</artifactId>
        <version>4.1.3.RELEASE</version>
    </dependency>
    <!--添加spring-web包 -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>4.1.7.RELEASE</version>
    </dependency>
    
    <!--添加aspectjweaver包 -->
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.8.7</version>
    </dependency>
    
    <!-- 添加mybatis的核心包 -->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.2.8</version>
    </dependency>
    
    <!-- 添加mybatis与Spring整合的核心包 -->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>1.2.2</version>
    </dependency>
    <!-- 添加servlet3.0核心包 -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.0.1</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>javax.servlet.jsp-api</artifactId>
        <version>2.3.1</version>
    </dependency>
    <!-- jstl -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>
    
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.8</version>
    </dependency>
    
    <dependency>
        <groupId>c3p0</groupId>
        <artifactId>c3p0</artifactId>
        <version>0.9.1.2</version>
    </dependency>
    
  </dependencies>
  <build>
    <finalName>mybatis_spring_test</finalName>
    
    <!-- 如果不添加此节点mybatis的mapper.xml文件都会被漏掉。 -->  
    <resources>  
        <resource>  
            <directory>src/main/java</directory>  
            <includes>  
                <include>**/*.properties</include>  
                <include>**/*.xml</include>  
            </includes>  
            <filtering>false</filtering>  
        </resource>  
        <resource>  
            <directory>src/main/resources</directory>  
            <includes>  
                <include>**/*.properties</include>  
                <include>**/*.xml</include>  
            </includes>  
            <filtering>false</filtering>  
        </resource>  
    </resources>  
  </build>
</project>
3.为项目手动添加src/main/java、src/test/resources、src/test/java这三个source folder,至此,项目搭建的工作全部完成。

二、创建数据库和表
三、编写相关代码
1.dao类
public interface TeacherMapper {

    int deleteByPrimaryKey(String tid);
    
    int insert(Teacher record);
    
    Teacher selectByPrimaryKey(int key);
    
    int updateByPrimaryKey(Teacher record);
}
TeacherMapper是一个接口,里面定义了操作ksl_teacher表的增删改查的方法。
2.实体类
public class Teacher implements Serializable{

    private int id;// id --> tid
    
    private String name;// name --> tname

    public Teacher(int id, String name) {
        super();
        this.id = id;
        this.name = name;
    }
    
    public Teacher() {
        super();
    }

    public int getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    @Override
    public String toString() {
        return "Teacher [id=" + id + ", name=" + name + "]";
    }
    
    
}
3.SQL映射文件
<?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.dao.TeacherMapper">

    <select id="selectByPrimaryKey" parameterType="int"
        resultType="com.domain.Teacher">
        select tid id, tname name from ksl_teacher where tid=#{key}
    </select>
 
    <update id="updateByPrimaryKey" parameterType="com.domain.Teacher">
        update ksl_teacher
        <set>
            tname=#{name}
        </set>
        where tid=#{id}
    </update>
    
    <delete id="deleteByPrimaryKey" parameterType="int">
        delete from ksl_teacher where tid=#{tid}
    </delete>
    
    <insert id="insert" parameterType="com.domain.Teacher">
        insert into ksl_teacher(tname) values (#{name, jdbcType=VARCHAR})
    </insert>
    
</mapper>
-----------------------
teacherMapping.xml这个文件的内容是编写操作ksl_teacher表的SQL语句,需要注意:
1.teacherMapping.xml的<mapper>标签的namespace必须是TeacherMapper接口的全类名,即<mapper namespace="com.dao.TeacherMapper">;
2.TeacherMapping.xml的定义操作数据库的<select><delete><update><insert>这些标签的id属性值必须和TeacherMapper接口定义的方法名一致。
之所以有上述的两点要求,就是为了能够让MyBatis可以根据TeacherMapper接口和TeacherMapping.xml文件去自动实现TeacherMapper接口中定义的相关方法,这样我们就不再需要针对TeacherMapper接口去编写具体的实现代码了。

四、Spring与MyBatis整合
1.编写相关配置文件(以下都在src/main/resources目录下)
dbconfig.properties:
driverClassName=com.mysql.jdbc.Driver
validationQuery=SELECT 1
jdbc_url=jdbc:mysql://localhost:3306/mysql
jdbc_username=root
jdbc_password=######

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"
    xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <!-- 引入dbconfig.properties属性文件 -->
    <context:property-placeholder location="classpath:dbconfig.properties" />
    <!-- 自动扫描(自动注入),扫描com.service这个包以及它的子包的所有使用@Service注解标注的类 -->
    <context:component-scan base-package="com.service" />
</beans>

spring-mybatis.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:aop="http://www.springframework.org/schema/aop"
    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-3.0.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">

    <!--1 配置C3P0数据源 -->
    <bean id="datasource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
        <!--驱动类名 -->
        <property name="driverClass" value="${driverClassName}" />
        <!-- url -->
        <property name="jdbcUrl" value="${jdbc_url}" />
        <!-- 用户名 -->
        <property name="user" value="${jdbc_username}" />
        <!-- 密码 -->
        <property name="password" value="${jdbc_password}" />
        <!-- 当连接池中的连接耗尽的时候c3p0一次同时获取的连接数  -->
        <property name="acquireIncrement" value="5"></property>
        <!-- 初始连接池大小 -->
        <property name="initialPoolSize" value="10"></property>
        <!-- 连接池中连接最小个数 -->
        <property name="minPoolSize" value="5"></property>
        <!-- 连接池中连接最大个数 -->
        <property name="maxPoolSize" value="20"></property>
    </bean>
    
    <!--2 会话工厂bean sqlSessionFactoryBean -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 数据源 -->
        <property name="dataSource" ref="datasource"></property>
        <!-- 别名 -->
        <!-- <property name="typeAliasesPackage" value="com.domain"></property> -->
        <!-- sql映射文件路径 -->
        <property name="mapperLocations" value="classpath*:com/mapping/*Mapping.xml"></property>
    </bean>
    
    <!--3 自动扫描对象关系映射 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--指定会话工厂,如果当前上下文中只定义了一个则该属性可省去 -->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
        <!-- 指定要自动扫描接口的基础包,实现接口 -->
        <property name="basePackage" value="com.dao"></property>
    </bean>
    
    <!--4 声明式事务管理 -->
    <!--定义事物管理器,由spring管理事务 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="datasource"></property>
    </bean>
    <!--支持注解驱动的事务管理,指定事务管理器 -->
    <tx:annotation-driven transaction-manager="transactionManager"/>

    <!--5 容器自动扫描IOC组件  -->
    <context:component-scan base-package="com.dao"></context:component-scan>
    
    <!--6 aspectj支持自动代理实现AOP功能 -->
    <aop:aspectj-autoproxy proxy-target-class="true"></aop:aspectj-autoproxy>
</beans>

2.进行单元测试
首先,在src/main/java目录下创建一个com.service包,然后在此包下创建一个TeacherServiceI接口:
public interface TeacherServiceI {

    void addTeacher(Teacher record);
    
    Teacher selectById(int tid);
}
然后,在com.service.impl包下创建一个针对此接口的实现类:
/*
 * 使用@Service注解将TeacherServiceImpl标注为一个Service
 * 其id为teacherService
 */
@Service("teacherService")
public class TeacherServiceImpl implements TeacherServiceI {

    /*
     * 使用@Autowired变量标注teacherMapper变量,
     * 当需要使用teacherMapper时,Spring就会自动注入
     */
    @Autowired
    private TeacherMapper teacherMapper;
    
    public void addTeacher(Teacher record) {
        teacherMapper.insert(record);
    }

    public Teacher selectById(int tid) {
        return teacherMapper.selectByPrimaryKey(tid);
    }

}
在src/test/java目录下编写单元测试类,新建一个com.test包,然后创建MyBatisTest类:
public class MyBatisTest {

    private TeacherServiceI teacherService;
    
    /*
     * Before方法在所有测试方法之前执行,并且只执行一次
     * 所有做Junit单元测试时一些初始化工作可以在这个方法里进行
     * 比如在Before方法里初始化ApplicationContext与TeacherService
     */
    @Before
    public void before() {
        //使用spring.xml和spring-mybatis.xml这两个配置文件创建Spring上下文
        ApplicationContext ac = new ClassPathXmlApplicationContext(new String[]{"spring.xml", "spring-mybatis.xml"});
        //从Spring的容器中根据Bean的id取出teacherService
        teacherService = (TeacherServiceI) ac.getBean("teacherService");
    }
    
    @Test
    public void testAddTeacher() {
        Teacher t = new Teacher();
        t.setName("nigemaiti");
        teacherService.addTeacher(t);
    }
}

最终,执行了maven clean--maven install之后,即可正常运行测试。
----------------------------------
五、在web服务器中进行测试
1.编辑web.xml,添加Spring监听器配置项:
<!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>
  <display-name>Archetype Created Web Application</display-name>
 
  <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>

    <listener>
        <description>Spring监听器</description>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <!-- ContextLoaderListener初始化Spring上下文时需要使用到的contextConfigLocation参数 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <!-- 配置spring.xml和spring-mybatis.xml这两个配置文件的位置,固定写法 -->
        <param-value>classpath:spring.xml,classpath:spring-mybatis.xml</param-value>
    </context-param>
</web-app>
2.在TeacherMapper接口中添加一个获取表格所有信息的方法:
List<Teacher> getAllTeachers();
3.在TeacherMapping.xml中编写getAllTeachers:
<resultMap type="com.domain.Teacher" id="BaseResultMap">
        <id column="tid" property="id" jdbcType="INTEGER" />
        <result column="tname" property="name" jdbcType="VARCHAR" />
</resultMap>
    
<select id="getAllTeachers" resultMap="BaseResultMap">
        select tid id, tname name from ksl_teacher
</select>
4.更新TeacherServiceI:
List<Teacher> getAllTeachers();
5.更新TeacherServiceImpl:
public List<Teacher> getAllTeachers() {
    return teacherMapper.getAllTeachers();
}
6.在src/main/java目录下创建一个com.web.controller包,然后在包中创建TeacherServlet:
/*
 * @WebServlet是Servlet3.0提供的注解,目的是将一个继承了HttpServlet的普通Java类标注为一个Servlet
 * TeacherServlet在使用了@WebServlet标注后,就不需要在web.xml中配置了
 */
@WebServlet("/teacherServlet")
public class TeacherServlet extends HttpServlet {

    // 处理业务逻辑的TeacherServiceI
    private TeacherServiceI teacherService;
    
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        List<Teacher> list = teacherService.getAllTeachers();
        request.setAttribute("listTeachers", list);
        request.getRequestDispatcher("/index.jsp").forward(request, response);
    }
    
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doGet(request, response);
    }
    
    public void init() {
        ApplicationContext ac = WebApplicationContextUtils.getWebApplicationContext(this.getServletContext());
        teacherService = (TeacherServiceI) ac.getBean("teacherService");
    }
}
7.编辑index.jsp,用于展示查询到的用户信息:
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%--加入该标签手动开启el功能--%>
<%@page isELIgnored="false"%>
<!DOCTYPE html>
<html>
    <head>
        <title>显示教师信息</title>
        <style type="text/css">
            table,td{
                border: 1px solid;
                border-collapse: collapse;
            }
        </style>
    </head>
    <body>
        <table>
            <tr>
                <td>教师ID</td>
                <td>教师名</td>
            </tr>
            <%--遍历listTeachers集合中的Teacher对象 --%>
            <c:forEach var="teacher" items="${listTeachers}">
                <tr>
                    <td>${teacher.id}</td>
                    <td>${teacher.name}</td>
                </tr>
            </c:forEach>
        </table>
    </body>
</html>
8.执行maven clean-maven install,然后将项目部署到Tomcat服务器中运行,最后输入地址
http://localhost:9080/mybatis_spring_test/teacherServlet访问。

标签:www,http,MyBatis3,spring,springframework,整合,org,public,Spring4
来源: https://www.cnblogs.com/yuanfei1110111/p/10352574.html