使用aop切面编写日志模块

我们先自定义一个注解（一个有关自定义注解的LJ文章 https://www.cnblogs.com/guomie/p/10824973.html）

/**
*
* 自定义日志注解
* Retention(RetentionPolicy.RUNTIME) 生命周期永远不会被丢弃
* Target(ElementType.METHOD) 作用于方法上
* Documented
*/
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface LogAnnotation {

   // 描述
   String actiondese() default "";

   //类型
   public enum Logtype {ADD,UPDATE,DEL,SET,LOGIN,LOGOUT,MESSAGE};

   Logtype actionvalue() default Logtype.ADD;
}

我们编写一个切面类

@Aspect
@Component
public class LogAop {
   @Autowired
   private RedisService redisService;

   @Autowired
   private LogService logService;
   
   // 切点
// @Pointcut("execution(* com.monitoring.controller..*.*(..))")
   @Pointcut("@annotation(com.annotations.LogAnnotation)")
   private void controllerAspect() {}

   //增强 
   @Around("controllerAspect()")
   public Object log(ProceedingJoinPoint pjp )throws Throwable{

　　　　//先运行目标方法
      Object object = pjp.proceed();

      //获取request
      RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
        ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) requestAttributes;
        HttpServletRequest request = servletRequestAttributes.getRequest();

      // 拦截当前方法的对象
      Object target = pjp.getTarget();
      // 获取正在拦截方法名称
      String methodName = pjp.getSignature().getName();
      // 获取方法的参数
      Object[] args = pjp.getArgs();
      // 获取请求的路径
//    String requestURI = request.getRequestURI();

      // 拦截的放参数类型
      Signature sig = pjp.getSignature();
      MethodSignature msig = null;
      if (!(sig instanceof MethodSignature)) {
         throw new IllegalArgumentException("该注解只能用于方法");
      }
      msig = (MethodSignature) sig;
      Class[] parameterTypes = msig.getMethod().getParameterTypes();

      Method method = null;
      String actionType = "07";
      String actionDesc = "";
      try {

         // 获取当前方法
         method = target.getClass().getMethod(methodName, parameterTypes);

      } catch (NoSuchMethodException | SecurityException e1) {
         // TODO Auto-generated catch block
         e1.printStackTrace();
      }
      
      
      if (null != method) {

         // 获取方法上的注解
         LogAnnotation annotation = method.getAnnotation(LogAnnotation.class);
         if(null == annotation) {
            return object;
         }
         // 获取注解上的信息
         actionDesc = annotation.actiondese();
         // 获取类型
         Logtype actionvalue = annotation.actionvalue();
         
         switch (actionvalue) {
         case ADD:
            actionType = "00";
            break;
         case UPDATE:
            actionType = "01";
            break;
         case DEL:
            actionType = "02";
            break;
         case SET:
            actionType = "03";
            break;
         case LOGIN:
            actionType = "04";
            break;
         case LOGOUT:
            actionType = "05";
            break;
         case MESSAGE:
            actionType = "06";
            break;
         default:
            actionType = "07";
            break;
         }
      }

      // 获取访问真实IP
      String internetIp = request.getHeader("x-forwarded-for");
      if (internetIp == null || internetIp.length() == 0 || "unknown".equalsIgnoreCase(internetIp)) {
         internetIp = request.getHeader("Proxy-Client-IP");
      }
      if (internetIp == null || internetIp.length() == 0 || "unknown".equalsIgnoreCase(internetIp)) {
         internetIp = request.getHeader("WL-Proxy-Client-IP");
      }
      if (internetIp == null || internetIp.length() == 0 || "unknown".equalsIgnoreCase(internetIp)) {
         internetIp = request.getRemoteAddr();
         if (internetIp.equals("127.0.0.1") || internetIp.equals("0:0:0:0:0:0:0:1")) {
            // 根据网卡取本机配置的IP
            InetAddress inet = null;
            try {
               inet = InetAddress.getLocalHost();
            } catch (UnknownHostException e) {
               e.printStackTrace();
            }
            internetIp = inet.getHostAddress();
         }

      }
      //对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
      if (internetIp != null && internetIp.length() > 15) { // "***.***.***.***".length() = 15
         if (internetIp.indexOf(",") > 0) {
            internetIp = internetIp.substring(0, internetIp.indexOf(","));
         }
      }

      // 创建日志对象用于保存
      BsUserLog4j log = new BsUserLog4j();
      BsUserInfo user = JsonUtils.jsonToPojo(redisService.get(args[0].toString()), BsUserInfo.class) ;

      //用户登出
      if(actionType == "04") {
         //删除缓存中的token值
         redisService.del(args[0].toString());
         System.out.println("已删除缓存中token值");
      }
      //设置时间
      SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
      String actionTime=sdf.format(new Date());
      
      // 设置log信息并保存数据库
      log.setLogId(new BigDecimal(IDUtils.genId()));
       log.setUsername(user.getUsername());
       log.setActionType(actionType);
       log.setActionTime(actionTime);
       log.setActionDesc(actionDesc);
      log.setInternetIp(internetIp);

      //添加日志到数据库
      logService.addLog(log);
      System.out.println("添加日志： " + log.toString());

      //最后返回目标方法
      return object;
   }
}

在配置里里面配置有关aop的配置

<beans   xmlns:aop="http://www.springframework.org/schema/aop"  xsi:schemaLocation="http://www.springframework.org/schema/aop  http://www.springframework.org/schema/aop/spring-aop-3.0.xsd" <beans>

<!-- 自动为@aspectJ切面bean创建代理，true表示使用CGLib来创建 -->
<aop:aspectj-autoproxy proxy-target-class="true" />

controller层代码

@LogAnnotation(actiondese="用户登录",actionvalue=Logtype.LOGIN)
@RequestMapping("/loginTest")
@ResponseBody
public CarResult loginTest(HttpServletResponse response,HttpServletRequest request, String name,String pas,String phoneNumer){}

 其中还会遇到一些问题 

1. error at ::0 formal unbound in pointcut 

当出现这个错误的时候 表示你的通知方法得带上参数 比如

但是 request 不能通过参数传递进来 只能通过下面方式来获取

RequestAttributes requestAttributes =  RequestContextHolder.getRequestAttributes();
ServletRequestAttributes servletRequestAttributes =  (ServletRequestAttributes) requestAttributes;
HttpServletRequest request = servletRequestAttributes.getRequest();

2.目标方法不执行

　　这时候我们需要先执行目标方法，然后再讲目标方法通过返回值返回出去