package cn.duanjt.util;

import java.lang.annotation.*;

/**

 * 记录日志的注解类

 * @author 段江涛

 * @date 2018-11-08

 */

@Target(ElementType.METHOD)//表示用于标识方法

@Retention(RetentionPolicy.RUNTIME)//表示运行时保留

public @interface LogEnable {

    /**

     * 主要是标志日志的描述信息

     * @return

     */

    String note() default "";

}

package cn.duanjt.service;

import org.springframework.stereotype.Service;

import cn.duanjt.Pojo.Student;

import cn.duanjt.util.LogEnable;

@Service

public class StudentService {

    //定义注解，然后描述当前方法的作用

    @LogEnable(note="获取学生信息")

    public Student getStudent(int id) {

        if (id == 0) {

            throw new RuntimeException("编码不能为0");

        }

        Student stu = new Student();

        stu.setId(id);

        stu.setName("zhangsan");

        stu.setAddr("重庆");

        return stu;

    }

    //未定义注解，将不会被监听

    public int getId(int id) {

        return id + 1;

    }

}

package cn.duanjt.util;

import org.apache.commons.lang3.StringUtils;

import org.aspectj.lang.ProceedingJoinPoint;

import org.aspectj.lang.annotation.Around;

import org.aspectj.lang.annotation.Aspect;

import org.aspectj.lang.reflect.MethodSignature;

import org.springframework.stereotype.Component;

@Aspect

@Component

public class LogHelper {

    // 没有单独定义切点，直接在环绕方法里面处理[包cn.duanjt.service下面的所有类下面的所有方法，同时包含LogEnable注解的将被监听]

    @Around("execution(* cn.duanjt.service.*.*(..)) && @annotation(LogEnable)")

    public Object around(ProceedingJoinPoint point) {

        MethodSignature signature = (MethodSignature) point.getSignature();

        long time = System.currentTimeMillis();                        //记录开始时间

        String className = point.getTarget().getClass().getName();    // 类名

        String method = className + "." + signature.getName();        //方法名

        Object[] args = point.getArgs();                            // 参数

        LogEnable logEnable= signature.getMethod().getAnnotation(LogEnable.class);

        String logNote=logEnable.note();                            //日志信息

        try {

            Object result = point.proceed();

            System.out.println("方法名:" + method);

            System.out.println("参数:" + StringUtils.join(args));

            System.out.println("返回值:" + result.toString());

            System.out.println("日志功能:" + logNote);

            System.out.println("耗时：" + (System.currentTimeMillis() - time) + "毫秒");

            System.out.println("-----------------------");

            return result;

        } catch (Exception e) {

            System.out.println("方法名1:" + method);

            System.out.println("参数:" + StringUtils.join(args));

            System.out.println("日志功能:" + logNote);

            System.out.println("异常信息:" + e.getMessage());

            System.out.println("耗时：" + (System.currentTimeMillis() - time) + "毫秒");

            System.out.println("-----------------------");

            return null;

        } catch (Throwable e) {

            return null;

        }

    }

}

package cn.duanjt;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.context.annotation.ComponentScan;

import org.springframework.context.annotation.EnableAspectJAutoProxy;

@SpringBootApplication

@ComponentScan("cn.duanjt")

@EnableAspectJAutoProxy //表示启用AOP

public class ServerDemoApplication {

    public static void main(String[] args) {

        SpringApplication.run(ServerDemoApplication.class, args);

    }

}

方法名:cn.duanjt.service.StudentService.getStudent

参数:

返回值:Student [id=, name=zhangsan, addr=重庆]

日志功能:获取学生信息

耗时：毫秒

-----------------------