spring 集成 mybatis的实例详解

1>先创建maven的quickstart项目;并且创建dao层,service层,controller层,po层,mapper,resources以及下面的配置文件(db.properties,log4j.properties,mybatis.xml,spring.xml).

2>配置pom.xml

​ 修改jdk版本;

​ 添加依赖:

​ junit版本改为4.12;spring-context;spring-test;spring-jdbc;spring-tx(事务);aspectjweaver(切面编程);c3p0(连接池);mybatis;mybatis-spring;mysql-connector-java(mysql驱动包);slf4j-log4j12,slf4j-api(日志打印);

​ 设置资源目录和插件

<build> <!-- Maven 项目:如果源代码(src/main/java)存在xml、properties、tld 等文件 Maven 默认不会自动编译该文件到输出目录,如果要编译源代码中xml properties tld 等文件 需要显式配置 resources 标签 --> <resources> <resource> <directory>src/main/resources</directory> </resource> <resource> <directory>src/main/java</directory> <includes> <include>**/*.xml</include> <include>**/*.properties</include> <include>**/*.tld</include> </includes> <filtering>false</filtering> </resource> </resources> </build>

3>配置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: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.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd'> <!-- 扫描基本包 --> <context:component-scan base-package='com.xxxx' /> <!-- 加载properties 配置文件 --> <context:property-placeholder location='classpath:db.properties' /> <!-- aop --> <aop:aspectj-autoproxy /> <!-- 配置c3p0 数据源 --> <bean class='com.mchange.v2.c3p0.ComboPooledDataSource'> <property name='driverClass' value='${jdbc.driver}'></property> <property name='jdbcUrl' value='${jdbc.url}'></property> <property name='user' value='${jdbc.username}'></property> <property name='password' value='${jdbc.password}'></property> </bean> <!-- 配置事务管理器 --> <bean class='org.springframework.jdbc.datasource.DataSourceTransactionManager'> <property name='dataSource' ref='dataSource'></property> </bean> <!-- 设置事物增强 --> <tx:advice transaction-manager='txManager'> <tx:attributes> <tx:method name='add*' propagation='REQUIRED' /> <tx:method name='insert*' propagation='REQUIRED' /> <tx:method name='update*' propagation='REQUIRED' /> <tx:method name='delete*' propagation='REQUIRED' /> </tx:attributes> </tx:advice> <!-- aop 切面配置 --> <aop:config> <aop:pointcut expression='execution(* com.xxxx.service..*.*(..))' /> <aop:advisor advice-ref='txAdvice' pointcut-ref='servicePointcut' /> </aop:config> <!-- 配置 sqlSessionFactory --> <bean class='org.mybatis.spring.SqlSessionFactoryBean'> <property name='dataSource' ref='dataSource'></property> <property name='configLocation' value='classpath:mybatis.xml' /> <property name='mapperLocations' value='classpath:com/xxxx/mapper/*.xml' /> </bean> <!-- 配置扫描器 --> <bean class='org.mybatis.spring.mapper.MapperScannerConfigurer'> <!-- 扫描com.xxxx.dao这个包以及它的子包下的所有映射接口类 --> <property name='basePackage' value='com.xxxx.dao' /> <property name='sqlSessionFactoryBeanName' value='sqlSessionFactory' /> </bean></beans>

4>配置 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> <!-- 定义类别名 --> <typeAliases> <package name='com.xxxx.po'/> </typeAliases></configuration>

5>配置 db.properties

jdbc.url中?前面的spring_mybatis是数据库名字,注意要修改下

password是密码,也是要修改下的

6>添加日志

jdbc.driver=com.mysql.cj.jdbc.Driverjdbc.url=jdbc:mysql://localhost:3306/spring_mybatis?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&useSSL=falsejdbc.username=rootjdbc.password=root

log4j.properties

log4j.rootLogger=DEBUG, Console# Consolelog4j.appender.Console=org.apache.log4j.ConsoleAppenderlog4j.appender.Console.layout=org.apache.log4j.PatternLayoutlog4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%nlog4j.logger.java.sql.ResultSet=INFOlog4j.logger.org.apache=INFOlog4j.logger.java.sql.Connection=DEBUGlog4j.logger.java.sql.Statement=DEBUGlog4j.logger.java.sql.PreparedStatement=DEBUG添加源代码

1>在po 包下创建 JavaBean 文件 User.java

public class User { private Integer userId; private String userName; private String userPwd; private String userEmail; private Date createDate; private Date updateDate; /** set get toString 方法省略 **/}

2>在dao层添加UserDao接口

public interface UserDao { User queryUserByUserId(Integer userId);}

3>在mapper包添加UserMapper.xml 映射文件

sql代码写在这地方

<?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.xxxx.dao.UserDao'> <select parameterType='int'resultType='com.xxxx.po.User'> select user_id as userId,user_name as userName,user_pwd as userPwd from tb_user where user_id = #{userId} </select></mapper>

4>添加 UserService.java

@Servicepublic class UserService { @Autowired private UserDao userDao; public User queryUserByUserId(Integer userId){ return userDao.queryUserByUserId(userId); }}

5>添加 UserController.java

@Controllerpublic class UserController { // 注入userService @Resource private UserService userService; /** * 通过用户ID查询用户对象 * @param userId * @return */ public User queryUserByUserId(Integer userId) { User user = userService.queryUserByUserId(userId); return user; }}

执行测试

public class App { public static void main(String[] args) { // 加载Spring的配置 BeanFactory factory = new ClassPathXmlApplicationContext('spring.xml'); // 得到UserController对象 UserController userController = (UserController)factory.getBean('userController'); // 调用方法 User user = userController.queryUserByUserId(1);System.out.println(user.toString()); }}

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