spring - Spring Logging 使用自定义注解

Question

我想写一个自定义注释，比如@loggable，当在方法级别声明时，它将向用户显示一些关于当前方法的日志消息。我该怎么办？这可能吗？如何使用 spring 注册此注释？我在哪里编写日志记录逻辑？

提前致谢。

Answer 1

这是一个关于如何做到这一点的好教程

使用 Spring AOP 自定义注解

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编辑 1

那么这是我写的一个示例程序，它完成了你想要的。这个日志方法，甚至是 Method 的执行时间。希望这可以帮助。

Loggable -- 自定义注解声明

package com.test.common.custom.annotation;
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Loggable {


   String message() default "Audit Message";

}

LogManager -- 这告诉 AspectJ 拦截哪些方法。

package com.test.common.custom.annotation.pointcutmgr;
@Service
@Aspect
public class LogManager {

       @Pointcut("execution(* com.test.service.*.*(..))")
       public void auditLog() {}

       @Pointcut("execution(* com.test.service.*.*(..))")
       public void performanceLog(){

       }

}

LogInterceptor - 建议如何处理拦截的方法

package com.test.common.custom.annotation;
@Service
@Aspect
public class LogInterceptor {
    @Before(value = "com.test.common.custom.annotation.pointcutmgr.LogManager.auditLog()"
            + "&& target(bean) "
            + "&& @annotation(com.test.common.custom.annotation.Loggable)"
            + "&& @annotation(logme)", argNames = "bean,logme")
    public void log(JoinPoint jp, Object bean, Loggable logme) {

        System.out.println(String.format("Log Message: %s", logme.message()));
        System.out.println(String.format("Bean Called: %s", bean.getClass()
                .getName()));
        System.out.println(String.format("Method Called: %s", jp.getSignature()
                .getName()));

    }

    @Around(value = "com.test.common.custom.annotation.pointcutmgr.LogManager.auditLog()"
            + "&& target(bean) "
            + "&& @annotation(com.test.common.custom.annotation.Loggable)"
            + "&& @annotation(logme)", argNames = "bean,logme")
    public void performanceLog(ProceedingJoinPoint joinPoint, Object bean, Loggable logme) throws Throwable {
        StopWatch stopWatch = new StopWatch();
        stopWatch.start();

        joinPoint.proceed();


        stopWatch.stop();

        StringBuffer logMessage = new StringBuffer();
        logMessage.append(joinPoint.getTarget().getClass().getName());
        logMessage.append(".");
        logMessage.append(joinPoint.getSignature().getName());
        logMessage.append("(");
        // append args
        Object[] args = joinPoint.getArgs();
        for (int i = 0; i < args.length; i++) {
            logMessage.append(args[i]).append(",");
        }
        if (args.length > 0) {
            logMessage.deleteCharAt(logMessage.length() - 1);
        }

        logMessage.append(")");
        logMessage.append(" execution time: ");
        logMessage.append(stopWatch.getTotalTimeMillis());
        logMessage.append(" ms");
        System.out.println(logMessage.toString());


    }
}

这是你如何使用它

用 注释方法@Loggable，这个will print logs and performance statistics

@Loggable(message = "Add Cutomer is fired")
public void addCustomer(){
    try {
        Thread.sleep(2000);
    } catch (InterruptedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    System.out.println("addCustomer() is running ");
}