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：
Xml代码
<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：
首先，我们定义一个工程中要用到的简单实体Bean-- User.java
Java代码 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
Java代码 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
Java代码 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
Java代码 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
Xml代码 <?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-returning pointcut-ref="login_PointcutTarget" arg-names="joinPoint,retValue" returning="retValue" method="afterReturning" /> </aop:aspect> </aop:config> <bean id="userAdvice" class="org.xmy.ldq.aop.UserAdvice"></bean> <bean id="aopBean" class="org.xmy.ldq.AOPBean"></bean> </beans>
说明：arg-names="joinPoint,retValue" 被切目标方法的参数名称；
Xml代码 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
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。
