了解Spring 注解注入

1. 创建Action文件，可以想像成controller

   import javax.annotation.Resource;public class UserAction{@Resourceprivate UserManager manager = null;
   //  @Resource
   //  public void setManager(UserManager manager) {
   //      this.manager = manager;
   //  }public String execute(){System.out.println("Manager:" + manager);return "success";}}

2. 创建Action中的usermanage对象,可以想像成service对象

   public class UserManager {public void add(){System.out.println("add...");}
   }

3. ApplicationContext文件配置

   <?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:aop="http://www.springframework.org/schema/aop"xmlns:tx="http://www.springframework.org/schema/tx"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-3.0.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd"><!-- 启用注解注入 --><context:annotation-config/><bean id="userAction" class="cn.com.xalead.spring.UserAction" scope="singleton"/><bean id="userManager" class="cn.com.xalead.spring.UserManager" />
   </beans>
   

4. 运行测试

   import org.springframework.beans.factory.BeanFactory;
   import org.springframework.context.support.ClassPathXmlApplicationContext;public class MainClass {public static void main(String[] args) {BeanFactory factory = new ClassPathXmlApplicationContext("app*.xml");UserAction ua = (UserAction)factory.getBean("userAction");ua.execute();}}

   结果输出：Manager:cn.com.xalead.spring.UserManager@1e27ed3