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)。
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