1、方法执行日志方案设计

1.1 注解的方式

通过定义日志注解+解析注解的方式来实现记录方法执行日志，这种方式在需要监控的接口实现方法上打上定义的注解，再通过解析注解的方式将日志记录到文件。

注解方式的优点是粒度细，在需要监控的服务接口实现方法打上注解就可以实现记录日志。缺点是服务接口太多的话，每一个接口都需要打上注解，比较繁琐。

定义注解

import java.lang.annotation.*;

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Log {
    
    String value() default "";
}

注解解析

import com.alibaba.fastjson.JSON;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
import java.lang.reflect.Method;


@Aspect
@Order(5)
@Component
public class LogAspect {
    
    /**
     * 记录开始时间
     */
    private ThreadLocal<Long> startTime = new ThreadLocal<>();

    /**
     * LOGGER
     */
    private static final Logger LOGGER = LoggerFactory.getLogger(LogAspect.class);


    @Pointcut("@annotation(xx.Log)")
    public void log(){
    }

    @Before("log()")
    public void doBefore(JoinPoint joinPoint) {
    
        long current = System.currentTimeMillis();
        startTime.set(current);

        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        Method method = signature.getMethod();

        LogUtil.info(LOGGER, "方法名称:", method.getName(), "method parameter:", method.getParameterTypes(), ",start time:", current);
    }


    @AfterReturning(returning="returnValue", pointcut = "log()")
    public void doAfterReturning(Object returnValue) {
    
        long gap = System.currentTimeMillis() - startTime.get();
        LogUtil.info(LOGGER, "returnValue:" + JSON.toJSONString(returnValue), ",gap:", gap);
    }
}

2.2 AOP的方式

通过AOP的方式来实现，对集成层服务接口的包定义切点切面，当调用服务时实际会调用的代理对象的方法，可以在前置和后置方法中实现日志的记录。AOP的方式的优点是粒度较粗，可以直接对包下面的所有服务全部记录日志。缺点是不能实现细粒度的日志记录。

切面方式

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
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.junit.Before;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;

@Aspect
@Order(5)
@Component
public class LogAspect {
    

    private ThreadLocal<Long> startTime = new ThreadLocal<>();

    /**
     * LOGGER
     */
    private static final Logger LOGGER = LoggerFactory.getLogger(LogAspect.class);

		//包及其子包执行
    @Pointcut("execution(* com.package..*.*(..))")
    public void log(){
    }

    @Before("log()")
    public void doBefore(JoinPoint joinPoint) {
    
        startTime.set(System.currentTimeMillis());

        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        Method method = signature.getMethod();
        Log mylog = method.getAnnotation(Log.class);
    }

    @Around("log()")
    public Object doAround(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
    

    }

    @AfterReturning(returning="returnValue", pointcut = "log()")
    public void doAfterReturning(Object returnValue) {
    
        long gap = System.currentTimeMillis() - startTime.get();
        System.out.println("returnValue:" + returnValue);
    }
}

2.3 xml配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	   xmlns:context="http://www.springframework.org/schema/context"
	   xmlns:aop="http://www.springframework.org/schema/aop"
	   xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd

         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"
	   default-autowire="byName">

	<!--开启注解扫描-->
	<context:component-scan base-package="com.package.xx"/>
	<!--开启AOP自动代理，默认为false-->
	<aop:aspectj-autoproxy />

</beans>