spring 集成 mybatis的实例详解
corona_sgj 人气:0这篇文章主要介绍了spring 集成 mybatis的实例详解,本文给大家介绍的非常详细，对大家的学习或工作具有一定的参考借鉴价值，需要的朋友可以参考下
环境配置
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 id="dataSource" 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 id="txManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 设置事物增强 -->
<tx:advice id="txAdvice" 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 id="servicePointcut" expression="execution(* com.xxxx.service..*.*(..))" />
<aop:advisor advice-ref="txAdvice" pointcut-ref="servicePointcut" />
</aop:config>
<!-- 配置 sqlSessionFactory -->
<bean id="sqlSessionFactory" 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 id="mapperScanner" 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.Driver jdbc.url=jdbc:mysql://localhost:3306/spring_mybatis? useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&useSSL=false jdbc.username=root jdbc.password=root
log4j.properties
log4j.rootLogger=DEBUG, Console # Console log4j.appender.Console=org.apache.log4j.ConsoleAppender log4j.appender.Console.layout=org.apache.log4j.PatternLayout log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n log4j.logger.java.sql.ResultSet=INFO log4j.logger.org.apache=INFO log4j.logger.java.sql.Connection=DEBUG log4j.logger.java.sql.Statement=DEBUG log4j.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 id="queryUserByUserId" 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
@Service
public class UserService {
@Autowired
private UserDao userDao;
public User queryUserByUserId(Integer userId){
return userDao.queryUserByUserId(userId);
}
}
5>添加 UserController.java
@Controller
public 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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