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

1.定义系统日志注解类

@target(elementtype.method)
@retention(retentionpolicy.runtime)
@documented
public @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
@component
public 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。如有错误或未考虑完全的地方，望不吝赐教。