在Spring 中使用@Aspect 控制自定义注解的操作

Spring 中使用@Aspect 控制自定义注解

看这篇介绍@Aspect

@Target(ElementType.METHOD)@Retention(RetentionPolicy.RUNTIME)@Documentedpublic @interface SysLog {String value() default '';}2.定义切面处理类

package com.kxs.common.aspect;import com.google.gson.Gson;import com.kxs.common.annotation.SysLog;import com.kxs.common.utils.HttpContextUtils;import com.kxs.common.utils.IPUtils;import com.kxs.modules.sys.entity.SysLogEntity;import com.kxs.modules.sys.entity.SysUserEntity;import com.kxs.modules.sys.service.SysLogService;import org.apache.shiro.SecurityUtils;import org.aspectj.lang.ProceedingJoinPoint;import org.aspectj.lang.annotation.Around;import org.aspectj.lang.annotation.Aspect;import org.aspectj.lang.annotation.Pointcut;import org.aspectj.lang.reflect.MethodSignature;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Component;import javax.servlet.http.HttpServletRequest;import java.lang.reflect.Method;import java.util.Date;/** * 系统日志，切面处理类 * * @author * @email * @date */@Aspect@Componentpublic class SysLogAspect { @Autowired private SysLogService sysLogService; @Pointcut('@annotation(com.kxs.common.annotation.SysLog)')//指向自定义注解路径 public void logPointCut() { } /** * 切面记录系统日志 * @param point * @return * @throws Throwable */ @Around('logPointCut()')// public Object around(ProceedingJoinPoint point) throws Throwable { long beginTime = System.currentTimeMillis(); //执行方法 Object result = point.proceed(); //执行时长(毫秒) long time = System.currentTimeMillis() - beginTime; //保存日志 saveSysLog(point, time); return result; }//保存日志 private void saveSysLog(ProceedingJoinPoint joinPoint, long time) { MethodSignature signature = (MethodSignature) joinPoint.getSignature(); Method method = signature.getMethod(); SysLogEntity sysLog = new SysLogEntity(); SysLog syslog = method.getAnnotation(SysLog.class); if(syslog != null){ //注解上的描述 sysLog.setOperation(syslog.value()); } //请求的方法名 String className = joinPoint.getTarget().getClass().getName(); String methodName = signature.getName(); sysLog.setMethod(className + '.' + methodName + '()'); //请求的参数 Object[] args = joinPoint.getArgs(); try{ String params = new Gson().toJson(args[0]); sysLog.setParams(params); }catch (Exception e){ } //获取request HttpServletRequest request = HttpContextUtils.getHttpServletRequest(); //设置IP地址 sysLog.setIp(IPUtils.getIpAddr(request)); //用户名 String username = ((SysUserEntity) SecurityUtils.getSubject().getPrincipal()).getUsername(); sysLog.setUsername(username); sysLog.setTime(time); sysLog.setCreateDate(new Date()); //保存系统日志 sysLogService.save(sysLog); }}

补充：为什么添加了@Aspect 还要加@Component

官方文档中有写：

You may register aspect classes as regular beans in your Spring XML configuration, or autodetect them through classpath scanning - just like any other Spring-managed bean. However, note that the @Aspect annotation is not sufficient for autodetection in the classpath: For that purpose, you need to add a separate @Component annotation (or alternatively a custom stereotype annotation that qualifies, as per the rules of Spring’s component scanner).

翻译：

您可以在Spring XML配置中注册aspect类，或者通过类路径扫描自动检测它们，就像任何其他Spring管理bean一样。但是，请注意，@aspect注释对于在类路径中自动检测是不够的：为了达到这个目的，您需要添加一个单独的@component注解（或者根据Spring的组件扫描器的规则来定义一个定制的原型注解）。

以上为个人经验，希望能给大家一个参考，也希望大家多多支持好吧啦网。如有错误或未考虑完全的地方，望不吝赐教。