了解Spring 注解注入

import javax.annotation.Resource;

public class UserAction{

@Resource
private UserManager manager = null;
//  @Resource
//  public void setManager(UserManager manager) {
//      this.manager = manager;
//  }

public String execute(){

System.out.println("Manager:" + manager);
return "success";
}

}

public class UserManager {

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

<?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.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 http://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>

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();
}

}

Manager:cn.com.xalead.spring.UserManager@1e27ed3