spingIoc注解方式之通常运用

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bean.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"    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"><!-- 开启注解扫描 --><context:component-scan base-package="cn.itcast.e_anno2"></context:component-scan><bean id="userDao" class="cn.itcast.e_anno2.UserDao" scope="prototype"></bean></beans>

UserDao.java

@Repository   // 在持久层可以选择用这个注解public class UserDao {public UserDao(){System.out.println("UserDao.UserDao()");}public UserDao(int id){System.out.println("UserDao.UserDao(int id)" + id);}public void save() {System.out.println("DB:保存用户!!!");}}

UserService.java

@Service   // 表示业务逻辑层的组件public class UserService {//  注意此类中没有setter方法//@Resource//  根据类型查找 【在容器中要确保该类型只有一个变量】@Resource(name = "userDao")  // 根据名称查找private UserDao userDao;  // 去容器中招UserDao类型的变量，找到后就赋值public void save() {userDao.save();}}

UserAction.java

package cn.itcast.e_anno2;import javax.annotation.Resource;import org.springframework.stereotype.Controller;@Controller  // 控制层的组件public class UserAction {@Resourceprivate UserService userService;public String execute() {userService.save();return null;}}

App.java

import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class App {// 创建容器对象private ApplicationContext ac = new ClassPathXmlApplicationContext("cn/itcast/e_anno2/bean.xml");@Testpublic void testExecuteAction() {// 从容器中获取ActionUserAction userAction = (UserAction) ac.getBean("userAction");userAction.execute();}}

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