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5. 整合 Spring部分
a. 先将 controller、service、dao 建立起来。
Controller：UserController.java
package ssm.controller;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.servlet.http.HttpServletRequest;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.propertyeditors.CustomDateEditor;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.ServletRequestDataBinder;
import org.springframework.web.bind.annotation.InitBinder;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import ssm.model.User;
import ssm.service.UserManagerService;
@Controller
@RequestMapping("/userManage") //模块路径
public class UserController {
@Autowired
UserManagerService userManagerService;
@RequestMapping(value="/findUserById", method=RequestMethod.GET)
public String findUserById(Model model, @RequestParam(required=true) Integer userId) throws Exception {
User user = userManagerService.findUserById(userId);
System.out.println(user);
model.addAttribute("user", user);
return "userManage/userDetail";
}
@InitBinder
protected void initBinder(HttpServletRequest request,
ServletRequestDataBinder binder) throws Exception {
binder.registerCustomEditor(Date.class, new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd"), true));
}
}
UserManagerService 接口和实现： UserManagerServiceImpl.java （只写实现）
package ssm.service.impl;
import ssm.dao.UserDAO;
import ssm.model.User;
import ssm.service.UserManagerService;
public class UserManagerServiceImpl implements UserManagerService {
private UserDAO userDAO;
public void setUserDAO(UserDAO userDAO) {
this.userDAO = userDAO;
}
@Override
public User findUserById(int id) throws Exception {
//调用 orderMapper 获取用户信息
return userDAO.findUserById(id);
}
}
UserDAO接口和实现（UserDAOImpl.java）：继承的 SqlSessionDaoSupport 用来为 DAO 提供 SqlSession。
import org.mybatis.spring.support.SqlSessionDaoSupport;
import org.springframework.beans.factory.annotation.Autowired;
import ssm.dao.UserDAO;
import ssm.mapper.UserMapper;
import ssm.model.User;
public class UserDAOImpl extends SqlSessionDaoSupport implements UserDAO {
@Autowired
private UserMapper userMapper;
@Override
public User findUserById(int userId) throws Exception {
User user = null;
user = userMapper.findUserById(userId);
return user;
}
}
b. 完成 Spring 的配置文件：前面 web.xml 中配置的 DispatcherServlet contextConfigLocation：spring-servlet.xml
注：因为 jackson 的包用的最新的，所以 消息转换器的 类：MappingJackson2HttpMessageConverter
<?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:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.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 http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd "> <!-- 组件扫描 --> <context:component-scan base-package="ssm.controller" /> <!-- 启动注解驱动 --> <!-- <mvc:annotation-driven /> --> <!-- 也可以自己配置映射器和适配器，替换上面的annotion-driven --> <!-- 映射器 --> <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping" /> <!-- 适配器 --> <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"> <property name="messageConverters"> <util:list id="messageConverter"> <ref bean="jsonHttpMessageConverter"/> </util:list> </property> </bean> <!-- 消息转换器 --> <bean id="jsonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"></bean> <!-- 视图解析器 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"></property> <property name="suffix" value=".jsp"></property> </bean> </beans>
c. 还记得之前在 mybatis 的 SqlMapConfig.xml 中配置的 数据库连接池吗？现在我们要把它交给 spring 来管理：将 SqlMapConfig.xml 中引用的 properties、 environments 等注释掉。并且在 resources/spring 下新建 applicationContext.xml 配置文件。如下：（因为用的 spring 4.2.2，database class 用的是 org.apache.commons.dbcp2.BasicDataSource， 并且属性 maxTotal 较早的版本是 maxActive）
<?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:mvc="http://www.springframework.org/schema/mvc"
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-3.1.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-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/aop
http://www.springframework.org/schema/aop/spring-aop-3.1.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.1.xsd ">
<context:property-placeholder location="classpath:db.properties"/>
<bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${oracle.driver}" />
<property name="url" value="${oracle.url}" />
<property name="username" value="${oracle.username}" />
<property name="password" value="${oracle.password}" />
<property name="maxTotal" value="30" />
<property name="maxIdle" value="5" />
</bean>
</beans>
d. service 配置文件： applicationContext-service.xml，将 service Bean 交给 spring 容器管理。
<?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:mvc="http://www.springframework.org/schema/mvc" 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-3.1.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-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/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd "> <bean id="userManagerService" class="ssm.service.impl.UserManagerServiceImpl"> <!-- 将 DAO 注入 service --> <property name="userDAO" ref="userDAO" /> </bean> </beans>
dao 配置文件：其中 关于 org.mybatis.spring.mapper.MapperScannerConfigurer 这个类我们后面再解释。
<?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:mvc="http://www.springframework.org/schema/mvc" 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-3.1.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-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/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd "> <!-- 配置 SqlSessionFactory --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="configLocation" value="classpath:mybatis/SqlMapConfig.xml"></property> </bean> <!-- mapper扫描器 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="ssm.mapper" /> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" /> </bean> <bean id="userDAO" class="ssm.dao.impl.UserDAOImpl"> <property name="sqlSessionFactory" ref="sqlSessionFactory" /> </bean> </beans>
OK！ Spring 的配置也完成了，那么写一个测试类 test 一下：SpringMyBatisTest.java
package test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import ssm.model.User;
import ssm.service.UserManagerService;
public class SpringMyBatisTest {
public static void main(String[] args) throws Exception {
//加载配置文件
ApplicationContext ctx = new ClassPathXmlApplicationContext(
"classpath:mybatis/SqlMapConfig.xml",
"classpath:spring/applicationContext.xml",
"classpath:spring/applicationContext-dao.xml",
"classpath:spring/applicationContext-service.xml");
UserManagerService service = (UserManagerService) ctx.getBean("userManagerService");
User user = service.findUserById(100101);
System.out.println("User ---- " + user);
}
}
应该可以查询出结果。。。
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原文地址：http://my.oschina.net/u/1757476/blog/531267
