spring 中使用@aspect 控制自定义注解

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)。

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