Spring AOP的初步总结(二)

该篇提供了一个小的AOP应用案例:系统日志

@Aspect
@Component
public class SysLogAspect {
    @Autowired
    private SysLogService sysLogService;
    
    @Pointcut("@annotation(io.renren.common.annotation.SysLog)")
    public void logPointCut() { 
        
    }

    @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;
    }

    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);
    }
}

此处切点logPointCut是附在注解io.renren.common.annotation.SysLog上的,

下面是注解SysLog:

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface SysLog {

    String value() default "";
}

切面代码中sysLogService无疑就是存入数据库的操作了,写持久层和建表这里都不赘述了.

应用的话只要在Controller上所需要的方法贴上注解即可,value给上操作名称