通过spring框架我们可以轻易地实现aop。来看下面的例子。

package com.fengshu.gotian.controller;import javax.inject.Named;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.EnableAspectJAutoProxy;import org.apache.log4j.Logger;import org.aspectj.lang.JoinPoint;import org.aspectj.lang.annotation.After;import org.aspectj.lang.annotation.Aspect;

import java.io.IOException;import java.io.PrintWriter;import java.util.Map;import javax.servlet.http.HttpServletRequest;import org.apache.commons.io.IOUtils;import org.apache.commons.lang.StringUtils;import org.aspectj.lang.JoinPoint;import org.aspectj.lang.ProceedingJoinPoint;import org.aspectj.lang.annotation.AfterThrowing;import org.aspectj.lang.annotation.Around;import org.aspectj.lang.annotation.Aspect;import org.aspectj.lang.annotation.Before;import org.aspectj.lang.annotation.Pointcut;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.ApplicationContext;import org.springframework.web.servlet.ModelAndView;import com.iflashbuy.base.common.ContextThread;import com.iflashbuy.base.common.JsonResult;import com.iflashbuy.base.enums.Status;import com.iflashbuy.base.util.JsonUtil;/** * 针对方法级别的切面 *  * @author 漂泊者及其影子 * @date 2016年2月17日 */@Aspectpublic class MethodInterceptor {	private static Logger logger = LoggerFactory.getLogger(MethodInterceptor.class);	@Autowired	private ApplicationContext applicationContext;	@Pointcut("bean(*Controller)")	public void pointcut1() {	}	@Pointcut("execution(* com.iflashbuy.chat.controller.*Controller.*(..))")	public void pointcut2() {	}	/*	 * @Pointcut("target(org.springframework.web.servlet.ModelAndView)")	 */public void pointcut3() {	}	@Before(value = "pointcut1() && pointcut2()")	public void before(JoinPoint point) {		HttpServletRequest request = ContextThread.getCurrentRequest();		try {			logger.info(point.getSignature() + " called...");			logger.info("request url:\n " + getRequstAddress(request));		} catch (Exception e) {			e.printStackTrace();		}	}	public static String getRequstAddress(HttpServletRequest request) {		String result = "";		String reqMethod = request.getMethod();		if ("POST".equals(reqMethod) || "post".equals(reqMethod)) {			result = request.getRequestURL() + "?" + getAllPostParam(request);		}		if ("GET".equals(reqMethod) || "get".equals(reqMethod)) {			result = request.getQueryString() != null ? request.getRequestURL().append("?")					.append(request.getQueryString()).toString() : request.getRequestURL().toString();		}		return result;	}	public static String getAllPostParam(HttpServletRequest request) {		@SuppressWarnings("unchecked")		Map
    
      postParam = request.getParameterMap();		String queryString = "";		for (String key : postParam.keySet()) {			String[] values = postParam.get(key);			for (int i = 0; i < values.length; i++) {				String value = values[i];				queryString += key + "=" + value + "&";			}		}		if (StringUtils.isNotEmpty(queryString)) {			queryString = queryString.substring(0, queryString.length() - 1);		}		return queryString;	}    //打印返回报文	@Around(value = "pointcut1() && pointcut2()")	public Object around(ProceedingJoinPoint pjp) throws Throwable {		JsonResult jsonResult = null;		Object object = pjp.proceed();	    if(!(object instanceof ModelAndView) && !(object instanceof String)) {			try {				logger.info("请求执行完毕，执行结果如下:\n{}", JsonUtil.objectToPrettyJsonStr(object));			} catch (Exception e) {			}		}		return object;	}	/**	 * 此切面在有数据源的项目中慎用，防止跟事务的aop冲突	 */	@AfterThrowing(pointcut = "pointcut1() && pointcut2()", throwing = "e")	public void handleException(JoinPoint jp, Exception e) {		JsonResult jsonResult = new JsonResult(Status.BUSY);		PrintWriter pw = null;		try {			pw = ContextThread.getCurrentResponse().getWriter();			ContextThread.getCurrentResponse().setCharacterEncoding("utf-8");			ContextThread.getCurrentResponse().setContentType("application/json;charset=UTF-8");			pw.println(JsonUtil.objectToJsonStr(jsonResult));		} catch (IOException ioException) {			logger.error("print response data error:" + ioException);		} finally {			IOUtils.closeQuietly(pw);		}		logger.error("aop catch top exception at {}：\n" + e, jp.getSignature());	}}
    

spring xml配置

注意

如果报

IllegalArgumentException Can not set field to $Proxy 在spring中使用事物或AOP遇到的错误，spring添加配置，这是因为spring 默认的动态代理是jdk动态代理 ，它必须针对接口不能针对实现

如上配置完成后每次执行com.fengshu.gotian.controller 包下的方法都会调用ActionLogger中的log方法.

以上配置，因为某些原因，比如版本或者配置等问题可能会出现不成功，可以使用org.springframework.aop.support.RegexpMethodPointcutAdvisor 作为替代解决方案 。。

此外如果是对于controller的拦截，配置应该放到spring*-servlet的配置文件里面