mybatis、Spring整合（eclipse）以及事务管理

1、项目目录

2、jar包

• dbcp:连接池
• pool：连接池
• logging:日志
• log4j:日志
• mybatis-spring：用于SqlSession等相关操作
• spring相关包
• mybatis

3、web.xml配置

• 可以删除本配置文件，本次测试用的是JUnit，不涉及网络访问，所有该配置文件并不需要

<?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" id="WebApp_ID" version="3.0">
 <display-name>transactionDome</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>
 <listener>
       <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
   </listener>

   <context-param>
       <param-name>contextConfigLocation</param-name>
       <param-value>classpath:spring-mybatis.xml</param-value>
   </context-param>

   <servlet>
       <servlet-name>springServlet</servlet-name>
       <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
       <init-param>
           <param-name>contextConfigLocation</param-name>
           <param-value></param-value>
       </init-param>
       <load-on-startup>1</load-on-startup>
   </servlet>

   <servlet-mapping>
       <servlet-name>springServlet</servlet-name>
       <url-pattern>/</url-pattern>
   </servlet-mapping>
</web-app>

4、spring-mybatis.xml配置

• 注释已经够详细，不再详细说明

<?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-3.1.xsd
                       http://www.springframework.org/schema/context
                       http://www.springframework.org/schema/context/spring-context-3.1.xsd
                       http://www.springframework.org/schema/mvc
                       http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
   <!-- 自动扫描 -->
   <context:component-scan base-package="com.sysker.spring.dome" />
   <!-- 引入配置文件 -->
   <bean id="propertyConfigurer"
       class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
       <property name="location" value="classpath:jdbc.properties" />
   </bean>
  <!-- 连接池配置 -->
   <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
       destroy-method="close">
       <property name="driverClassName" value="${driver}" />
       <property name="url" value="${url}" />
       <property name="username" value="${username}" />
       <property name="password" value="${password}" />
       <!-- 初始化连接大小 -->
       <property name="initialSize" value="${initialSize}"></property>
       <!-- 连接池最大数量 -->
       <property name="maxActive" value="${maxActive}"></property>
       <!-- 连接池最大空闲 -->
       <property name="maxIdle" value="${maxIdle}"></property>
       <!-- 连接池最小空闲 -->
       <property name="minIdle" value="${minIdle}"></property>
       <!-- 获取连接最大等待时间 -->
       <property name="maxWait" value="${maxWait}"></property>
   </bean>  

   <!-- spring和MyBatis完美整合，不需要mybatis的配置映射文件 -->
   <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
       <property name="dataSource" ref="dataSource" />
       <!-- 自动扫描mapping.xml文件 -->
       <property name="mapperLocations" value="classpath:com/sysker/spring/dome/mapping/*.xml"></property>
   </bean>  

   <!-- DAO接口所在包名，Spring会自动查找其下的类 -->
   <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
       <property name="basePackage" value="com.sysker.spring.dome.dao" />
       <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
   </bean>  

   <!-- (事务管理)transaction manager, use JtaTransactionManager for global tx -->
   <bean id="transactionManager"
       class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
       <property name="dataSource" ref="dataSource" />
   </bean>  

   <!-- 配置事务管理模板：Spring为了简化事务管理的代码而提供的类 -->
   <bean id="transactionTemplate" class="org.springframework.transaction.support.TransactionTemplate">
   	<property name="transactionManager" ref="transactionManager"></property>
   </bean>

</beans>  

5、jdbc.properties配置

driver=com.mysql.jdbc.Driver

url=jdbc:mysql://localhost:3306/spring?characterEncoding=UTF-8&useSSL=false 

username=root

password=root

initialSize=0  

maxActive=20  

maxIdle=20  

minIdle=1  

maxWait=60000 

6、log4j配置（日志）

#定义LOG输出级别
log4j.rootLogger=INFO,Console,File
#定义日志输出目的地为控制台
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.Target=System.out
#可以灵活地指定日志输出格式，下面一行是指定具体的格式
log4j.appender.Console.layout = org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=[%c] - %m%n  

#文件大小到达指定尺寸的时候产生一个新的文件
log4j.appender.File = org.apache.log4j.RollingFileAppender
#指定输出目录
log4j.appender.File.File = logs/ssm.log
#定义文件最大大小
log4j.appender.File.MaxFileSize = 10MB
# 输出所以日志，如果换成DEBUG表示输出DEBUG以上级别日志
log4j.appender.File.Threshold = ALL
log4j.appender.File.layout = org.apache.log4j.PatternLayout
log4j.appender.File.layout.ConversionPattern =[%p] [%d{yyyy-MM-dd HH\:mm\:ss}][%c]%m%n

7、entity及mapping.xml

package com.sysker.spring.dome.entity;

public class Account {
    // 账户id
    private String id;
    // 账号名
    private String name;
    // 余额
    private String money;

    public Account() {
        super();
    }

    public Account(String id, String name, String money) {
        super();
        this.id = id;
        this.name = name;
        this.money = money;
    }

    public String getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public String getMoney() {
        return money;
    }

    public void setMoney(String money) {
        this.money = money;
    }

}

• 由于直接mapping中直接用的是穿进来的参数，所以实体类也没有用到

<?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.sysker.spring.dome.dao.AccountDao">
    <update id="inMoney">
    	update account set
    	money = money + #{arg1}
    	where name = #{arg0}
    </update>

    <update id="outMoney">
    	update account set
    	money = money - #{arg1}
    	where name = #{arg0}
    </update>
</mapper>

8、Dao

package com.sysker.spring.dome.dao;

public interface AccountDao {
    void outMoney(String out, String money);

    void inMoney(String in, String money);
}

9、service及serviceImpl

package com.sysker.spring.dome.service;

public interface AccountService {

    void transfer(String out, String in, String money);
}

service实现，包含了事务管理

package com.sysker.spring.dome.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.support.TransactionCallbackWithoutResult;
import org.springframework.transaction.support.TransactionTemplate;

import com.sysker.spring.dome.dao.AccountDao;
import com.sysker.spring.dome.service.AccountService;

@Service
public class AccountServiceImpl implements AccountService {

    @Autowired
    private AccountDao accountDao;

    @Autowired
    private TransactionTemplate transactionTemplate;

    @Override
    public void transfer(String out, String in, String money) {
        /**
         * 事务管理，execute()方法中创建了一个匿名内部类，在匿名内部类中操作业务，即可实现事务管理
         */
        transactionTemplate.execute(new TransactionCallbackWithoutResult() {

            @Override
            protected void doInTransactionWithoutResult(TransactionStatus transactionStatus) {
                accountDao.outMoney(out, money);
                int i = 1/0;
                accountDao.inMoney(in, money);

            }
        });

    }

}

10、测试类

package com.sysker.spring.dome.test;

import javax.annotation.Resource;

import org.apache.log4j.Logger;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.sysker.spring.dome.service.AccountService;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {"classpath:spring-mybatis.xml"})
public class TestMybatis {
    private static Logger logger = Logger.getLogger(TestMybatis.class);
    @Resource
    private AccountService accountService = null;

    @Test
    public void test1() {
        accountService.transfer("aaa", "bbb", "200");
        logger.info("success");

    }

}

总结

• 今天在慕课网学习，本来是打算实现事务管理的，但发现视频中老师采用的是jdbc连接，所以就参考老师的思路，实现了mybatis-spring整合，过程虽然艰难，但确实收获满满：
• • 1、对依赖注入有了更深的理解和认知，对spring有了更全面的认知，当然更多的还是发现自己了解的太浅；
• • 2、多练习，多尝试，多思考，多琢磨，多总结，当你踩完所有的坑，你就离成神之路不远了
• • 3、我始终比较喜欢在bug中学习，每填掉一个坑都让人感到兴奋，同时也会收获很多