JAVA框架 Spring 和Mybatis整合（传统dao）

一：我们使用spring处理service，mybaits处理dao层。

二：导入jar包

pom.xml文件内容：

 <?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.</modelVersion>

   <groupId>jd.com</groupId>
   <artifactId>AddSpringAndMy</artifactId>
   <version>1.0-SNAPSHOT</version>
   <packaging>war</packaging>

   <name>AddSpringAndMy Maven Webapp</name>
   <!-- FIXME change it to the project's website -->
   <url>http://www.example.com</url>

   <properties>
     <project.build.sourceEncoding>UTF-</project.build.sourceEncoding>
     <maven.compiler.source>1.8</maven.compiler.source>
     <maven.compiler.target>1.8</maven.compiler.target>
   </properties>
   <dependencies>
     <dependency>
       <groupId>org.hamcrest</groupId>
       <artifactId>hamcrest-library</artifactId>
       <version>1.3</version>
     </dependency>
     <dependency>
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-log4j12</artifactId>
       <version>1.7.</version>
     </dependency>
     <dependency>
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-api</artifactId>
       <version>1.7.</version>
     </dependency>
     <dependency>
       <groupId>org.apache.logging.log4j</groupId>
       <artifactId>log4j-core</artifactId>
       <version>2.0.</version>
     </dependency>
     <dependency>
       <groupId>org.apache.logging.log4j</groupId>
       <artifactId>log4j-api</artifactId>
       <version>2.0.</version>
     </dependency>
     <dependency>
       <groupId>spring-jms</groupId>
       <artifactId>spring-jms</artifactId>
       <version>4.2.</version>
     </dependency>
     <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-web</artifactId>
       <version>4.3..RELEASE</version>
     </dependency>
     <dependency>
       <groupId>mysql</groupId>
       <artifactId>mysql-connector-java</artifactId>
       <version>5.1.</version>
     </dependency>
     <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-oxm</artifactId>
       <version>4.1..RELEASE</version>
     </dependency>
     <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-test</artifactId>
       <version>4.1..RELEASE</version>
     </dependency>
     <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-expression</artifactId>
       <version>4.3..RELEASE</version>
     </dependency>
     <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-core</artifactId>
       <version>4.3..RELEASE</version>
     </dependency>
     <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-beans</artifactId>
       <version>4.3..RELEASE</version>
     </dependency>
     <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-context</artifactId>
       <version>4.3..RELEASE</version>
     </dependency>
     <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-aop</artifactId>
       <version>4.3..RELEASE</version>
     </dependency>
     <dependency>
       <groupId>aopalliance</groupId>
       <artifactId>aopalliance</artifactId>
       <version>1.0</version>
     </dependency>
     <dependency>
       <groupId>spring-aspects</groupId>
       <artifactId>spring-aspects</artifactId>
       <version>4.2.</version>
     </dependency>
     <dependency>
       <groupId>com.springsource.org</groupId>
       <artifactId>aspectj.weaver</artifactId>
       <version>1.6.</version>
     </dependency>

     <dependency>
       <groupId>org.apache.commons</groupId>
       <artifactId>commons-pool2</artifactId>
       <version>2.4.</version>
     </dependency>

     <dependency>
       <groupId>org.apache.commons</groupId>
       <artifactId>commons-dbcp2</artifactId>
       <version>2.0.</version>
     </dependency>
     <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-jdbc</artifactId>
       <version>4.1..RELEASE</version>
     </dependency>
     <dependency>
       <groupId>log4j</groupId>
       <artifactId>log4j</artifactId>
       <version>1.2.</version>
     </dependency>
     <dependency>
       <groupId>org.javassist</groupId>
       <artifactId>javassist</artifactId>
       <version>3.16.-GA</version>
     </dependency>
     <dependency>
       <groupId>org.mybatis</groupId>
       <artifactId>mybatis-spring</artifactId>
       <version>1.2.</version>
     </dependency>
     <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-tx</artifactId>
       <version>4.1..RELEASE</version>
     </dependency>
     <dependency>
       <groupId>commons-logging</groupId>
       <artifactId>commons-logging</artifactId>
       <version>1.1.</version>
     </dependency>
     <dependency>
       <groupId>cglib</groupId>
       <artifactId>cglib</artifactId>
       <version>2.2.</version>
     </dependency>
     <dependency>
       <groupId>asm</groupId>
       <artifactId>asm</artifactId>
       <version>3.3.</version>
     </dependency>
     <dependency>
       <groupId>org.mybatis</groupId>
       <artifactId>mybatis</artifactId>
       <version>3.2.</version>
     </dependency>
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
       <version>4.11</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.junit.jupiter</groupId>
       <artifactId>junit-jupiter-api</artifactId>
       <version>RELEASE</version>
     </dependency>
     <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-test</artifactId>
       <version>4.3..RELEASE</version>
     </dependency>
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
       <version>RELEASE</version>
     </dependency>
   </dependencies>

   <build>
     <finalName>AddSpringAndMy</finalName>
     <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
       <plugins>
         <plugin>
           <artifactId>maven-clean-plugin</artifactId>
           <version>3.0.</version>
         </plugin>
         <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
         <plugin>
           <artifactId>maven-resources-plugin</artifactId>
           <version>3.0.</version>
         </plugin>
         <plugin>
           <artifactId>maven-compiler-plugin</artifactId>
           <version>3.7.</version>
         </plugin>
         <plugin>
           <artifactId>maven-surefire-plugin</artifactId>
           <version>2.20.</version>
         </plugin>
         <plugin>
           <artifactId>maven-war-plugin</artifactId>
           <version>3.2.</version>
         </plugin>
         <plugin>
           <artifactId>maven-install-plugin</artifactId>
           <version>2.5.</version>
         </plugin>
         <plugin>
           <artifactId>maven-deploy-plugin</artifactId>
           <version>2.8.</version>
         </plugin>
       </plugins>
     </pluginManagement>
   </build>
 </project>

注意：

在引用jar包的话，会出现jar包冲突，注意版本的引用，最好版本号一致。

jar包清单：

三、配置文件整合

1）首先引用properites文件（注意引用外部文件使用classpath引用）

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

2）开启注解扫描和动态代理

     <context:component-scan base-package="jd.com" />
     <aop:aspectj-autoproxy />

3）我们将DataSource和sqlSessionFactory叫给spring个管理

     <!--定义数据库连接池-->
     <bean id="basicDataSource" class="org.apache.commons.dbcp2.BasicDataSource" >
         <!--支持el表达式-->
         <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="maxTotal" value="" />
         <property name="maxIdle" value="" />
     </bean>

因为SqlSessionFactory是接口，可以使用mybatis-spring的整合的实现类：SqlSessionFactoryBean

其中需要在注入DataSource和配置文件的注入。注意需要是用classpath文件引用

    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
         <!--依赖DataSource-->
         <property name="dataSource" ref="basicDataSource"/>
          <!--加载mybaits的配置文件-->
         <property name="configLocation" value="classpath:SqlMapConfig.xml" />
     </bean>

4)注入dao层和service层

     <bean id="dao" class="jd.com.dao.trDaoImpl">
         <property name="SqlSessionFactory" ref="sqlSessionFactory"/>
     </bean>
     <bean class="jd.com.service.serFindByIdImpl" id="serv">
         <property name="dao" ref="dao" />
     </bean>

applicationContext.xml完整配置文件：

 <?xml version="1.0" encoding="UTF-8"?>
 <!--总的约束-->
 <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">
 <!--加载配置文件，定义的properites文件
     引入外部文件使用classpath关键字。
 -->

     <context:component-scan base-package="jd.com" />
     <aop:aspectj-autoproxy />

 <context:property-placeholder location="classpath:db.properites" />
     <!--定义数据库连接池-->
     <bean id="basicDataSource" class="org.apache.commons.dbcp2.BasicDataSource" >
         <!--支持el表达式-->
         <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="maxTotal" value="" />
         <property name="maxIdle" value="" />
     </bean>
     <!--配置mapper
             其中：org.mybatis.spring.SqlSessionFactoryBean 是SqlSessionFactory的实现类，该类在mybatis-spring.1.2..jar里。
     -->
     <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
         <!--依赖DataSource-->
         <property name="dataSource" ref="basicDataSource"/>
          <!--加载mybaits的配置文件-->
         <property name="configLocation" value="classpath:SqlMapConfig.xml" />
     </bean>
     <bean id="dao" class="jd.com.dao.trDaoImpl">
         <property name="SqlSessionFactory" ref="sqlSessionFactory"/>
     </bean>
     <bean class="jd.com.service.serFindByIdImpl" id="serv">
         <property name="dao" ref="dao" />
     </bean>

 </beans>

其中db.properits是配置数据库配置。

在看下mybatis的配置文件：只是一个子配置文件引入：

 <?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>
     <mappers >
         <mapper resource="user.xml" />

         <!--<mapper class="jd.com.proxydao.AccMapper" />-->
         <!--<package name="jd.com.proxydao"  />-->
         <!--<package name="jd.com.vo" />-->
         <!--<package name="jd.com.vodemo" />-->
         <!--导入配置文件-->
         <!--<package name="jd.com" />-->
     </mappers>
 </configuration>

子配置文件user.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">
 <!--和主配置文件约束是不一样的-->
 <mapper namespace="findById">
     <select id="findId" parameterType="int" resultType="jd.com.dao.user" >
         SELECT * FROM username WHERE  id=#{id};
     </select>
 </mapper>

注意：在不使用mybatis的动态代理的情况下，需要注意 namespace和id不是对应的接口的接口名和方法。

user.class实体类：

 package jd.com.dao;

 public class user {
     private Integer id;
     private String name;
     private String sex;

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

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

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

     public Integer getId() {
         return id;
     }

     public String getName() {
         return name;
     }

     public String getSex() {
         return sex;
     }

     @Override
     public String toString() {
         return this.getName()+" "+this.getId()+" "+this.getSex();
     }
 }

dao层：

接口：

 package jd.com.dao;

 public interface trDao {
      user findUserByName(Integer id);
 }

实现类：注意这个里继承扫起来SqlSessionSupport类。在注入dao层的时候需要注意的引用sqlsessionfactory  所以这之前spring的自己daosupport一样需要引用相应的（DataSource）

 package jd.com.dao;

 import org.apache.ibatis.session.SqlSession;
 import org.mybatis.spring.support.SqlSessionDaoSupport;
 import org.springframework.stereotype.Repository;

 //需要继承SqlSessionDaoSupport

 public class trDaoImpl extends SqlSessionDaoSupport implements trDao {

     @Override
     public user findUserByName(Integer id) {
 //        SqlSessionDaoSupport该类有相应的set方法和get方法 应该类型spring的DaoSupport
         SqlSession sqlSession=this.getSqlSession();

         user use=sqlSession.selectOne("findById.findId",id);
         return use;
     }
 }

service层：

接口：

 package jd.com.service;

 import jd.com.dao.user;

 public interface trService {
     user serFindById(Integer id);
 }

实现类：

 package jd.com.service;

 import jd.com.dao.trDao;
 import jd.com.dao.user;
 import org.springframework.stereotype.Service;

 import javax.annotation.Resource;

 @Service(value = "serv")
 public class serFindByIdImpl implements trService {
     @Resource(name="dao")
     private trDao dao;

     @Override
     public user serFindById(Integer id) {
         user use=this.dao.findUserByName(id);
         return use;
     }
 }

测试类：

 package jd.com.testDemo;

 import jd.com.dao.user;
 import jd.com.service.serFindByIdImpl;
 import org.junit.jupiter.api.Test;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.support.ClassPathXmlApplicationContext;

 public class testDemo {

 //    @Resource(name="sev")
 //    private serFindByIdImpl serv;

     @Test
     public  void test1(){
         ApplicationContext ap=new ClassPathXmlApplicationContext("applicationContext.xml");
         serFindByIdImpl serv= (serFindByIdImpl) ap.getBean("serv");
         System.out.println();
         user us=serv.serFindById();
         System.out.println(us);

     }
 }
 ;