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。

另外需要引用 aspectJ 的 jar 包： aspectjweaver.jar aspectjrt.jar

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pom中的jar包支持

<!--spring-aop依赖 --><dependency>  <groupId>org.aspectj</groupId>  <artifactId>aspectjweaver</artifactId>  <version>1.7.4</version></dependency><dependency>  <groupId>org.aspectj</groupId>  <artifactId>aspectjrt</artifactId>  <version>1.7.4</version></dependency><dependency>  <groupId>org.aspectj</groupId>  <artifactId>aspectjtools</artifactId>  <version>1.7.4</version></dependency><dependency>  <groupId>cglib</groupId>  <artifactId>cglib</artifactId>  <version>2.2</version></dependency>-----------------------------------------------------------------------------------------------------------------自定义注解Controller部分

package cn.cjq.util.aop;

import java.lang.annotation.*;

/** *自定义注解 拦截Controller */

@Target({ElementType.PARAMETER, ElementType.METHOD})@Retention(RetentionPolicy.RUNTIME)@Documentedpublic  @interface SystemControllerLog {   String description()  default "";}---------------------------------------------------------------------------------------------------------------

自定义注解Service业务部分

package cn.cjq.util.aop;import java.lang.annotation.*;/** *自定义注解 拦截service */@Target({ElementType.PARAMETER, ElementType.METHOD})@Retention(RetentionPolicy.RUNTIME)@Documentedpublic  @interface SystemServiceLog {   String description()  default "";}--------------------------------------------------------------------------------------------------------------------------------切面类

package cn.cjq.util.aop;

import cn.cjq.entity.User;import org.aspectj.lang.JoinPoint;import org.aspectj.lang.annotation.*;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.stereotype.Component;import org.springframework.web.context.request.RequestContextHolder;import org.springframework.web.context.request.ServletRequestAttributes;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpSession;import java.lang.reflect.Method;

/** * 切点类 * @author cjq * @since 2017-11-28 * @version 1.0 */@Aspect@Componentpublic  class SystemLogAspect {

   //本地异常日志记录对象   private  static  final Logger logger = LoggerFactory.getLogger(SystemLogAspect. class);

   //Service层切点   @Pointcut("@annotation(cn.cjq.util.aop.SystemServiceLog)")   public  void serviceAspect() {   }

   //Controller层切点   @Pointcut("@annotation(cn.cjq.util.aop.SystemControllerLog)")   public  void controllerAspect() {   }

   /**    * 前置通知 用于拦截Controller层记录用户的操作    *    * @param joinPoint 切点    */   @Before("controllerAspect()")   public  void doBefore(JoinPoint joinPoint) {

      HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();      HttpSession session = request.getSession();      //读取session中的用户      User user = (User) session.getAttribute("user");      //请求的IP      String ip = request.getRemoteAddr();      try {         //*========控制台输出=========*//         System.out.println("=====前置通知开始=====");         System.out.println("请求方法:" + (joinPoint.getTarget().getClass().getName() + "." + joinPoint.getSignature().getName() + "()"));         System.out.println("方法描述:" + getControllerMethodDescription(joinPoint));         //System.out.println("请求人:" + user.getUsername());         System.out.println("请求IP:" + ip);         //*========数据库日志=========*//         /*Log log = SpringContextHolder.getBean("logxx");         log.setDescription(getControllerMethodDescription(joinPoint));         log.setMethod((joinPoint.getTarget().getClass().getName() + "." + joinPoint.getSignature().getName() + "()"));         log.setType("0");         log.setRequestIp(ip);         log.setExceptionCode( null);         log.setExceptionDetail( null);         log.setParams( null);         log.setCreateBy(user);         log.setCreateDate(DateUtil.getCurrentDate());         //保存数据库         logService.add(log);*/         System.out.println("=====前置通知结束=====");      }  catch (Exception e) {         System.out.println("=====Controller通知结束=====");         //记录本地异常日志         logger.error("==前置通知异常==");         logger.error("异常信息:{}", e.getMessage());      }   }

   /**    * 异常通知 用于拦截service层记录异常日志    *    * @param joinPoint    * @param e    */   @AfterThrowing(pointcut = "serviceAspect()", throwing = "e")   public  void doAfterThrowing(JoinPoint joinPoint, Throwable e) {      HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();      HttpSession session = request.getSession();      //读取session中的用户      User user = (User) session.getAttribute("user");      //获取请求ip      String ip = request.getRemoteAddr();      //获取用户请求方法的参数并序列化为JSON格式字符串      String params = "";      if (joinPoint.getArgs() !=  null && joinPoint.getArgs().length > 0) {         for ( int i = 0; i < joinPoint.getArgs().length; i++) {            params += joinPoint.getArgs()[i] + ";";         }      }      try {         /*========控制台输出=========*/         System.out.println("=====异常通知开始=====");         System.out.println("异常代码:" + e.getClass().getName());         System.out.println("异常信息:" + e.getMessage());         System.out.println("异常方法:" + (joinPoint.getTarget().getClass().getName() + "." + joinPoint.getSignature().getName() + "()"));         System.out.println("方法描述:" + getServiceMthodDescription(joinPoint));         //System.out.println("请求人:" + user.getUsername());         System.out.println("请求IP:" + ip);         System.out.println("请求参数:" + params);               /*==========数据库日志=========*/         /*Log log = SpringContextHolder.getBean("logxx");         log.setDescription(getServiceMthodDescription(joinPoint));         log.setExceptionCode(e.getClass().getName());         log.setType("1");         log.setExceptionDetail(e.getMessage());         log.setMethod((joinPoint.getTarget().getClass().getName() + "." + joinPoint.getSignature().getName() + "()"));         log.setParams(params);         log.setCreateBy(user);         log.setCreateDate(DateUtil.getCurrentDate());         log.setRequestIp(ip);         //保存数据库         logService.add(log);*/         System.out.println("=====异常通知结束=====");      }  catch (Exception ex) {         System.out.println("=====Service通知结束=====");         //记录本地异常日志         logger.error("==异常通知异常==");         logger.error("异常信息:{}", ex.getMessage());      }         /*==========记录本地异常日志==========*/      logger.error("异常方法:{}异常代码:{}异常信息:{}参数:{}", joinPoint.getTarget().getClass().getName() + joinPoint.getSignature().getName(), e.getClass().getName(), e.getMessage(), params);

   }

   /**    * 获取注解中对方法的描述信息 用于service层注解    *    * @param joinPoint 切点    * @return 方法描述    * @throws Exception    */   public  static String getServiceMthodDescription(JoinPoint joinPoint)         throws Exception {      String targetName = joinPoint.getTarget().getClass().getName();      String methodName = joinPoint.getSignature().getName();      Object[] arguments = joinPoint.getArgs();      Class targetClass = Class.forName(targetName);      Method[] methods = targetClass.getMethods();      String description = "";      for (Method method : methods) {         if (method.getName().equals(methodName)) {            Class[] clazzs = method.getParameterTypes();            if (clazzs.length == arguments.length) {               description = method.getAnnotation(SystemServiceLog. class).description();               break;            }         }      }      return description;   }

 /**    * 获取注解中对方法的描述信息 用于Controller层注解    *@SystemControllerLog(description = "用户登录")   该方法获取描述部分

    * @param joinPoint 切点    * @return 方法描述    * @throws Exception    */   public  static String getControllerMethodDescription(JoinPoint joinPoint)  throws Exception {      String targetName = joinPoint.getTarget().getClass().getName();      String methodName = joinPoint.getSignature().getName();      Object[] arguments = joinPoint.getArgs();      Class targetClass = Class.forName(targetName);      Method[] methods = targetClass.getMethods();      String description = "";      for (Method method : methods) {         if (method.getName().equals(methodName)) {            Class[] clazzs = method.getParameterTypes();            if (clazzs.length == arguments.length) {               description = method.getAnnotation(SystemControllerLog. class).description();               break;            }         }      }      return description;   }}----------------------------------------------------------------------------------------------------------------------------------------xml配置支持

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"  xmlns:aop="http://www.springframework.org/schema/aop"   xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context"   xsi:schemaLocation="http://www.springframework.org/schema/beans    http://www.springframework.org/schema/beans/spring-beans.xsd    http://www.springframework.org/schema/context    http://www.springframework.org/schema/context/spring-context-4.0.xsd     http://www.springframework.org/schema/aop    http://www.springframework.org/schema/aop/spring-aop-3.1.xsd   http://www.springframework.org/schema/mvc    http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd"> <!--划红线的为配置aop必须的xml文件头 -->

 <aop:aspectj-autoproxy/>  <！--这行对aop配置至关重要，且必须放在spring-mvc配置文件中方可生效 -->   <!-- 自动扫描(自动注入) -->   <context:component-scan base-package="cn.cjq.controller;cn.cjq.api;"/>

<mvc:annotation-driven  /><!-- cache-period="315360000" -->--------------------------------------------------------------------------------------------------------

实例:Controller前置拦截

/** * 用户登录 */@ResponseBody()@RequestMapping(value = "userLogin")@SystemControllerLog(description = "用户登录")public Object userLogin(      @RequestParam(value="userName",required=false,defaultValue="") String userName,      @RequestParam(value="passWord",required=false,defaultValue="") String passWord,      @RequestParam(value="rememberMe",required=false,defaultValue="0") boolean rememberMe,      @RequestParam(value="validateCode",required=false,defaultValue="") String validateCode,      @RequestParam(value="userType",required=false,defaultValue="") String userType      ) throws Exception{      String error=null;      Subject subject = SecurityUtils.getSubject();      UsernamePasswordToken token = new UsernamePasswordToken(userName, passWord,rememberMe);      try {              subject.login(token);         //如何能够访问到已经在 Realm 中获取到的 User 的实例.         //Object principal = SecurityUtils.getSubject().getPrincipals().getPrimaryPrincipal();

      } catch (UnknownAccountException e) {            error = "用户名/密码错误";          } catch (IncorrectCredentialsException e) {              error = "用户名/密码错误";          } catch (AuthenticationException e) {              //其他错误，比如锁定，如果想单独处理请单独catch处理              error = "其他错误：" + e.getMessage();          }      Map<Object, Object> result = new HashMap<Object, Object>();      if(error != null ){         result.put("success", false);         result.put("message", error);      }else{         User user = userServiceImpl.findByUserName(userName);         Session sessions = subject.getSession();         sessions.setAttribute("user",user );         result.put("success", true);      }      return result;}

实例2：service异常拦截

/** * 根据用户名查询账号信息 */@SystemServiceLog(description = "查询账号信息异常")public User findByUserName (String username)throws Exception{

   User user = new User();

   List<User> accList = userMapper.findByUserName(username);   if(accList.size()>0){      user = accList.get(0);   }else{      user = null;   }   return user;}