一、前言
通过Spring注释的方式(基于xml配置文件的方式参考其他页)实现面向切面编程AOP的,首先定义切面方法如@Pointcut("execution(public * com.xwood.test.action.*Action.*(..))"),然后再通过@Before、@Around、@After注释在方法前后处理公共的业务逻辑,如日志、通用抽象逻辑处理等
二、代码示例
1. 定义日志处理拦截器LogIntercept,具体代码如下
import org.aspectj.lang.ProceedingJoinPoint;@b@import org.aspectj.lang.annotation.After;@b@import org.aspectj.lang.annotation.Around;@b@import org.aspectj.lang.annotation.Aspect;@b@import org.aspectj.lang.annotation.Before;@b@import org.aspectj.lang.annotation.Pointcut;@b@import org.springframework.stereotype.Component;@b@@b@@Aspect@b@@Component@b@public class LogIntercept{@b@ @b@ @Pointcut("execution(public * com.xwood.test.action.*Action.*(..))")@b@ public void actionLog(){}@b@ @b@ @b@ @Before("actionLog()")@b@ public void before() {@b@ this.printLog(" @Before actionLog() 准备打印action层日志... ");@b@ }@b@ @b@ @Around("actionLog()")@b@ public void around(ProceedingJoinPoint pjp) throws Throwable{@b@ this.printLog(" @Around actionLog() 准备打印action层日志... ");@b@ pjp.proceed();@b@ this.printLog(" @Around actionLog() action层逻辑已经执行完成 ");@b@ }@b@ @b@ @b@ @After("actionLog()")@b@ public void after() {@b@ this.printLog(" @After actionLog() action层逻辑已经执行完成 ");@b@ }@b@ @b@ @b@ private void printLog(String str){@b@ System.out.println(str);@b@ }@b@ @b@}
2. 定义Action层的用例如UserAction,如下
import org.springframework.stereotype.Controller;@b@@b@@Controller@b@public class UserAction{@b@ @b@ public void login(){@b@ System.out.println(" 【UserAction】 用户登录 ... ");@b@ }@b@@b@}
3.spring的相关配置,定义xmlns:aop="http://www.springframework.org/schema/aop"、http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd的申明,并添加<aop:aspectj-autoproxy proxy-target-class="true"/> 配置项
<?xml version="1.0" encoding="UTF-8"?>@b@<beans xmlns="http://www.springframework.org/schema/beans"@b@ xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"@b@ xmlns:context="http://www.springframework.org/schema/context"@b@ xmlns:aop="http://www.springframework.org/schema/aop"@b@ xsi:schemaLocation="@b@ http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd@b@ http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd@b@ http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">@b@ @b@ <!-- 自动扫描Action加入Spring上下文 Scope:prototype -->@b@ <context:component-scan base-package="com.xwood.test" scope-resolver="org.springframework.context.annotation.Jsr330ScopeMetadataResolver"/>@b@ <aop:aspectj-autoproxy proxy-target-class="true"/> @b@ @b@</beans>
4. 测试用例类ActionLogTest,代码如下
import org.junit.Test;@b@import org.springframework.beans.factory.annotation.Autowired;@b@import org.springframework.test.context.ContextConfiguration;@b@import org.springframework.test.context.junit4.AbstractJUnit4SpringContextTests;@b@@b@import com.xwood.test.action.UserAction;@b@@b@@ContextConfiguration(locations={"classpath*:spring-*.xml"})@b@public class ActionLogTest extends AbstractJUnit4SpringContextTests {@b@ @b@ @Autowired@b@ private UserAction action;@b@ @b@ @Test@b@ public void test() throws Exception{@b@ action.login();@b@ }@b@@b@}
控制台日志如下
@Around actionLog() 准备打印action层日志... @b@ @Before actionLog() 准备打印action层日志... @b@ 【UserAction】 用户登录 ... @b@ @Around actionLog() action层逻辑已经执行完成 @b@ @After actionLog() action层逻辑已经执行完成