刚学了mybatis,现在用mybatis整合一下springmvc
配置文件
jdbc.properties
jdbc.driverClass = com.mysql.jdbc.Driver
jdbc.jdbcUrl = jdbc:mysql:///ssm
jdbc.username = root
jdbc.password =xxx12345
log4j.properties
### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %p %c{}:%L - %m%n
#\u5728\u5F00\u53D1\u73AF\u5883\u4E0B\u8BBE\u7F6E\u6210debug
log4j.rootLogger=DEBUG, stdout
log4j.logger.com.springframework=DEBUG
log4j.logger.com.ibatis=DEBUG
log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=DEBUG
log4j.logger.com.ibatis.common.jdbc.ScriptRunner=DEBUG
log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=DEBUG
log4j.logger.java.sql.Connection=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG
log4j.logger.java.sql.ResultSet=DEBUG
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: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-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<!-- 扫描service层 -->
<context:component-scan base-package="com.ssm.service.impl" />
<!-- 引入jdbc配置文件 -->
<context:property-placeholder location="classpath:jdbc.properties" />
<!-- 配置dbcp的数据源 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${jdbc.driverClass}" />
<property name="url" value="${jdbc.jdbcUrl}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
<property name="maxActive" value="10"></property>
<property name="maxIdle" value="5"></property>
</bean>
<!-- 配置sqlSessionFactory -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<!-- 自动扫描entity目录, 省掉Configuration.xml里的手工配置 -->
<property name="mapperLocations" value="classpath:com/ssm/mapper/*.xml" />
</bean>
<!-- 配置mapper扫描 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.ssm.mapper" />
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
</bean>
<!-- 配置事务管理器 -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager" />
</beans>
说一下顺序,首先加载jdbc的配置文件,然后配置数据源,这里用到的是dbcp的数据源,网上有很多用的是阿里巴巴的Druid数据源,这里先不暂不使用,其实用法都一样,都是用来提供dataSource的。之后是配置配置sqlSessionFactory,sqlSessionFactory的class在mybatis和spring整合的jar包中,并在sqlSessionFactory中注入dataSource,所以顺序不应该弄错,先配置好了数据源,才能在sqlSessionFactory中注入;然后通过mapperLocations属性来加载所有mapper.xml文件,个人感觉mybatis的核心就在这个配置文件了。之后通过basePackage来扫描所有mapper.java类。最后就是基于注解的事务管理,一般都标注在service层。
spring-mvc.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: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-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<!-- 自动扫描controller包下的所有类 -->
<context:component-scan base-package="com.ssm.controller" />
<!-- 视图解析器 -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
<!--可为空,方便实现自已的依据扩展名来选择视图解释类的逻辑 -->
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView" />
</bean>
</beans>
这里面就两个东西,一个是扫描controller类,一个是视图控制器。
web.xml
<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
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">
<!-- 监听器 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring*.xml</param-value>
</context-param>
<!-- 字符过滤器 -->
<filter>
<filter-name>CharacterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- 中央处理器 -->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring*.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<!-- struts习惯使用/*,在springmvc不管用 -->
<url-pattern>*.do</url-pattern>
</servlet-mapping>
</web-app>
这个web.xml文件很简单,就三个东西,一个是监听器,在启动tomcat时候加载的配置文件,字符过滤器,还有就是springmvc的中央处理器。
User类
public class User {
private long uid;
private String name;
private int age;
//省略setter getter方法
此实体类对应数据库的user表。
UserMapper.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">
<!-- 命名空间 -->
<mapper namespace="com.ssm.mapper.UserMapper">
<select id="findUserById" parameterType="long" resultType="com.ssm.pojo.User">
SELECT * from user where uid = #{uid};
</select>
</mapper>
这个也很简单了,就是根据id查询,namespace是mapper.java的全路径,输入映射是uid的类型,输出映射是这个实体。
UserMapper
package com.ssm.mapper;
import com.ssm.pojo.User;
public interface UserMapper {
//根据id查询
public User findUserById(long uid);
}
mapper.java类必须满足的条件:
1.接口的全路径和mapper.xml的namespace一致。
2.接口的方法名和mapper.xml的id一致。
3.接口的输入参数和mapper.xml的parameterType类型一致
4.接口的输出类型和mapper.xml的resultType一致。
service
public interface UserService {
// 根据id查询
public User findUserById(long uid);
}
serviceImpl
package com.ssm.service.impl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.ssm.mapper.UserMapper;
import com.ssm.pojo.User;
import com.ssm.service.UserService;
@Service
public class UserServiceImpl implements UserService{
@Autowired
private UserMapper userMapper;
@Override
public User findUserById(long uid) {
return userMapper.findUserById(uid);
}
}
@service:表示把这个类交给spring管理,spring会自动扫描到这个注解的类并把它放入spring容器中。
@Autowired:表示把UserMapper 类注入到这个类中。
测试
SpringMybatisTest
public class SpringMybatisTest {
/***
* 测试spring整合mybatis
*/
@Test
public void test1() {
ApplicationContext context = new ClassPathXmlApplicationContext(
"spring-mybatis.xml");
UserService userService = (UserService) context.getBean("userServiceImpl");
User user = userService.findUserById();
System.out.println(user);
}
输出:
说明mybatis整合spring成功。
现在测试mybatis整合springmvc
UserController
package com.ssm.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import com.ssm.pojo.User;
import com.ssm.service.UserService;
@Controller
@RequestMapping("/userController")
public class UserController {
@Autowired
private UserService userService;
@RequestMapping("shouUser")
public String showUser() {
System.out.println("run...");
User user = userService.findUserById();
System.out.println(user);
return "showUser";
}
}
同理把这个类交给spring管理,并注入userservice。
启动服务器(tomcat7)输入:
`http://localhost:8080/dust/userController/shouUser.do`
成功跳转到WEB-INF下jsp下的一个测试页面。
showUser.jsp
ssm is ok! <br>
控制台输出:
run...
User [uid=, name=胖佳, age=]
证明mybatis整合springmvc成功。