Java web切面编程

在我们的 web开发中我们在对公用的一些方法我们需要抽取出来这样达到代码的冗余今天我利用项目上用的AOP的实际应用做了一个整理

首先 xml配置扫描

<?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: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/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">

<aop:aspectj-autoproxy />

<context:component-scan base-package="com.leimingtech.platform.core.interceptors" />

<context:component-scan base-package="com.leimingtech.cms.interceptors" />

</beans>

活动切面示列

import java.util.Map;

import javax.servlet.http.HttpServletRequest;

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.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Component;

import com.leimingtech.core.common.ContentClassify;

import com.leimingtech.core.base.ContextHolderUtils;

import com.leimingtech.core.entity.ContentsEntity;

import com.leimingtech.core.entity.VoteEntity;

import com.leimingtech.core.service.SystemService;

import com.leimingtech.core.service.VoteServiceI;

import com.leimingtech.core.util.StringUtils;

/**

* 投票切面类

* @author zhangxiaoqiang

@Aspect

@Component

public class VoteInterceptor{

@Autowired

private SystemService systemService;

@Autowired

private VoteServiceI voteService;

*所要切面的那个方法类

@Pointcut("execution(public * com.leimingtech.core.service.ContentsServiceI.saveContent(..))")

public void myMethod(){};

/**

* 下面用到的是织入点语法, 看文档里面有. 就是指定在该方法前执行

* 记住下面这种通用的, *表示所有

* @param map

@Before("myMethod()&&args(map,..)")

public void beforeMethod(Map<String,Object> map){

}

/**

* 正常执行完后

* 保存内容之后，保存投票

* @param map

@After("myMethod()&&args(map,..)")

public void after(Map<String,Object> map){

ContentsEntity contents = (ContentsEntity) map.get("contents");

VoteEntity vote = (VoteEntity) map.get("vote");

HttpServletRequest request = ContextHolderUtils.getRequest();

//内容id

String contentsId = request.getParameter("contentsId");

if(StringUtils.isNotEmpty(contentsId)){

contents= voteService.get(ContentsEntity.class, String.valueOf(contentsId));

}

String classify = contents.getClassify();

if(ContentClassify.CONTENT_VOTE.equals(classify)){

voteService.saveVote(contents, vote);

}

/**

* 正常执行完后

@AfterReturning("myMethod()")

public void afterReturnning(){

}

/**

* 抛出异常时才调用

@AfterThrowing("myMethod()")

public void afterThrowing(){

}

巴特西

Java web切面编程

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