SpringMVC使用注解配置AOP

注解配置AOP（使用 AspectJ 类库实现的），大致分为三步：

1. 使用注解@Aspect来定义一个切面，在切面中定义切入点(@Pointcut),通知类型(@Before, @AfterReturning,@After,@AfterThrowing,@Around).
2. 开发需要被拦截的类。
3. 将切面配置到xml中，当然，我们也可以使用自动扫描Bean的方式。这样的话，那就交由Spring AoP容器管理。
4. 另外需要引用 aspectJ 的 jar 包： aspectjweaver.jar aspectjrt.jar

User.java

package com.bjsxt.model;public class User {    private String username;    private String password;    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }}

/***接口类*/package com.bjsxt.dao;import com.bjsxt.model.User;public interface UserDAO {    public void save(User user);}

实现接口：

package com.bjsxt.dao.impl;import org.springframework.stereotype.Component;import com.bjsxt.dao.UserDAO;import com.bjsxt.model.User;@Component("u")public class UserDAOImpl implements UserDAO {    public void save(User user) {        System.out.println("user save11d!");        /*throw new RuntimeException("exception");*/ //抛异常    }}

操作类：

package com.bjsxt.service;import javax.annotation.Resource;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Qualifier;import org.springframework.stereotype.Component;import com.bjsxt.dao.UserDAO;import com.bjsxt.model.User;@Component("userService")public class UserService {    private UserDAO userDAO;      public void init() {        System.out.println("init");    }    public void add(User user) {        userDAO.save(user);    }    public UserDAO getUserDAO() {        return userDAO;    }    @Resource(name="u")    public void setUserDAO( UserDAO userDAO) {        this.userDAO = userDAO;    }    public void destroy() {        System.out.println("destroy");    }}

加入aop

package com.bjsxt.aop;import org.aspectj.lang.annotation.After;import org.aspectj.lang.annotation.AfterReturning;import org.aspectj.lang.annotation.AfterThrowing;import org.aspectj.lang.annotation.Aspect;import org.aspectj.lang.annotation.Before;import org.aspectj.lang.annotation.Pointcut;import org.springframework.stereotype.Component;@Aspect@Componentpublic class LogInterceptor {    @Pointcut("execution(public * com.bjsxt.service..*.add(..))")    public void myMethod(){};/*@Before("execution(public void com.bjsxt.dao.impl.UserDAOImpl.save(com.bjsxt.model.User))")*/    @Before("myMethod()")    public void before() {        System.out.println("method start");    }     @After("myMethod()")    public void after() {        System.out.println("method after");    }     @AfterReturning("execution(public * com.bjsxt.dao..*.*(..))")    public void AfterReturning() {        System.out.println("method AfterReturning");    }     @AfterThrowing("execution(public * com.bjsxt.dao..*.*(..))")    public void AfterThrowing() {        System.out.println("method AfterThrowing");    } }

配置文件

<?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"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-2.5.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-2.5.xsdhttp://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop-3.1.xsd"><!-- 要添加最后2行 -->    <context:annotation-config />    <!-- 自动扫描 -->    <context:component-scan base-package="com.bjsxt"/>       <!-- 要添加本行 -->    <aop:aspectj-autoproxy/> </beans>

测试类：

package com.bjsxt.service;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.bjsxt.model.User;//Dependency Injection//Inverse of Controlpublic class UserServiceTest {    @Test    public void testAdd() throws Exception {        ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");        UserService service = (UserService)ctx.getBean("userService");        System.out.println(service.getClass());        service.add(new User());        System.out.println("###");        ctx.destroy();    }}

结果：

class com.bjsxt.service.UserService$$EnhancerByCGLIB$$7b201784method staetuser save11d!method AfterReturningmethod after

注意：

• @Aspect：意思是这个类为切面类
• @Componet：因为作为切面类需要 Spring 管理起来，所以在初始化时就需要将这个类初始化加入 Spring 的管理；
• @Before：切入点的逻辑(Advice)
• execution…:切入点语法

此内容转载自 偶my耶 的博客:

http://www.cnblogs.com/oumyye/p/4480196.html

如需转载请注明出处！