spring AOP 返回后通知 简单示例
开始前我们要导入spring需要的jar包；
还需要引入?aspectjweaver.jar 和?cglib.jar 这两个jar包
如果是maven项目的话，在pom.xml 的dependencies节点下添加如下引用即可：
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?<dependency>
<groupId>aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.5.3</version>
</dependency>
<dependency>
<groupId>cglib</groupId>
<artifactId>cglib</artifactId>
<version>2.2.2</version>
</dependency>
现在开始：
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首先，我们定义一个工程中要用到的简单实体Bean--?User.java
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package org.xmy.ldq.entity;import java.io.Serializable;/** * 测试用实体 * @author LiDuanqiang */public class User implements Serializable{private static final long serialVersionUID = 5752197085695030514L;private String id;private String name;private String password;private String address;public User() {}public User(String id, String name,String password,String address) {super();this.id = id;this.name = name;this.password = password;this.address = address;}public String getId() {return id;}public void setId(String id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}}?
?接下来定义一个通知对象：UserAdvice.java
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package org.xmy.ldq.aop;import org.aspectj.lang.JoinPoint;/** * 用户操作的通知对象 * @author LiDuanqiang */public class UserAdvice {/** * 主体方法返回后将执行的通知方法 * @param JoinPoint * @param retValue主体方法传递到通知方法的返回值 * @return */public Object afterReturning(JoinPoint joinPoint,Object retValue)throws Throwable{Object object = null;object = joinPoint.getThis();//返回代理对象/*切入点主体方法的名字*/String methodName = joinPoint.getSignature().getName();if (retValue instanceof Boolean && (Boolean)retValue && methodName.equals("login")) {System.out.println("方法:"+methodName+"()"+"成功执行;"+"登录成功!");}return object;}}?
?再定义一个目标类:AOPBean.java
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package org.xmy.ldq;import org.xmy.ldq.entity.User;/** * 主体Bean * @author LiDuanqiang */public class AOPBean{public Boolean login(User user){Boolean ret = false;/*用户名和密码都为ldq则成功登录*/if (user.getName().equals("ldq")&&user.getPassword().equals("ldq")) {ret = true;}return ret;}}?
?最后定义一个测试主程序的实现类：App.java
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package org.xmy.ldq;import org.springframework.context.support.ClassPathXmlApplicationContext;import org.xmy.ldq.entity.User;/** * 测试 * @author LiDuanqiang */public class App{public static void main( String[] args ){ClassPathXmlApplicationContext factory =new ClassPathXmlApplicationContext("applicationContext.xml");AOPBean aopBean = (AOPBean) factory.getBean("aopBean");aopBean.login(new User("1","ldq","ldq","cs"));System.exit(0);}}?
?配置文件很重要:applicationContext.xml
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<?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:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:p="http://www.springframework.org/schema/p"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd"><aop:config><!-- 定义切点 --><aop:pointcut id="login_PointcutTarget" expression="execution(* org.xmy.ldq.AOPBean.login(..))"/><!-- 定义切面 --><aop:aspect id="userAspect" ref="userAdvice"><aop:after-returningpointcut-ref="login_PointcutTarget"arg-names="joinPoint,retValue"returning="retValue"method="afterReturning"/></aop:aspect></aop:config><bean id="userAdvice" 被切目标方法的参数名称；?
returning="retValue" 目标方法成功执行后的返回值 一般类型定义为 Object；method="afterReturning"目标方法名称?
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如果程序中报出
java.lang.NoClassDefFoundError: org/aspectj/weaver/reflect/ReflectionWorld$ReflectionWorldException
是aspectjweaver.jar包丢失了，将其引入即可；
?Cannot proxy target class because CGLIB2 is not available. Add CGLIB to the class path or specify proxy interfaces.错误 是因为采用的CGLIB代理，应把相应的jar包引入。
1 楼 tonytony3 2011-11-16 十分感谢你的afterReturning(JoinPoint joinPoint,Object retValue)
arg-names="joinPoint,retValue
查了好久也查不得 ，现在用你的可以实现需求了，更细粒度地 做业务日志，THANK YOU VERY MUCH！ 2 楼 冬天秋天 2011-11-18 tonytony3 写道十分感谢你的afterReturning(JoinPoint joinPoint,Object retValue)
arg-names="joinPoint,retValue
查了好久也查不得 ，现在用你的可以实现需求了，更细粒度地 做业务日志，THANK YOU VERY MUCH！
呵呵，真的吗，我也很开心哈！