Arthas 常用命令

入门链接

1.查看源码：jad

2.清屏：cls

3.查看静态资源信息：getstatic

package com.demo.common;

import com.demo.entity.User;
import org.springframework.stereotype.Component;

import java.util.HashMap;
import java.util.Map;

/** * Description: 静态资源 * * @Author: * @Date: 2022-07-29 22:05 * @version: V1.0.0 */
@Component
public class DemoCommon {
    

    private static Map<String, User> USER_MAP;

    static {
    
        USER_MAP = new HashMap<>();

        USER_MAP.put("moon",new User("moon",18));
        USER_MAP.put("starts",new User("starts",18));
        USER_MAP.put("earth",new User("earth",18));

    }

}

4.查看方法返回值：watch

## 1.发起请求
## http://127.0.0.1/test/query
## 2.如果只观察一次，则
watch com.demo.controller.Test  query -n 1

5.查看方法耗时：trace

## 1.发起请求
## http://127.0.0.1/test/login
## 2.如果只观察一次，则
trace com.demo.service.impl.TestServiceImpl login
## 3.如果只观察异常耗时，则（毫秒），即耗时大于2500ms才打印
trace com.demo.service.impl.TestServiceImpl login '#cost > 2500'

线上调试（临时修改源码）

1.反编译为Java文件

## 1.命令
jad --source-only com.demo.controller.Test > C:\Users\Administrator\Desktop\source_code\Test.java

## 2.修改（Sublime）如果是在Linux系统，则可使用 VIM 命令

2.内存编译（在内存将源码编译为Class文件）

## 1.命令
mc C:\\Users\\Administrator\\Desktop\\source_code\\Test.java -d C:\\Users\\Administrator\\Desktop\\source_code\\

3.类增强

## 1.命令（修改方法返回值为 8 ）
retransform C:\\Users\\Administrator\\Desktop\\source_code\\com\\demo\\controller\\Test.class
## 2.查看已增强的类（可重复执行1命令）
retransform -l
## 3.请求测试
## http://127.0.0.1/test/query
## 4.增强恢复，先清除增强类
retransform -d 1
retransform -d 2
## 5.重置
reset

测试结果

重置

重置后结果

reset 不生效，则在重置前执行一下其他命令，如：trace com.demo.controller.Test query
然后再执行reset即可

测试代码

用户

package com.demo.entity;

import lombok.AllArgsConstructor;
import lombok.Data;

/** * Description: 用户 * * @Author: * @Date: 2022-07-29 21:17 * @version: V1.0.0 */
@Data
@AllArgsConstructor
public class User {
    

    private String name;
    private int age;

}

控制层

package com.demo.controller;

import com.demo.service.TestService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/** * Description: 测试 * * @Author: * @Date: 2022-07-25 23:30 * @version: V1.0.0 */
@CrossOrigin
@RestController
@RequestMapping("/test")
public class Test {
    

    private TestService testService;

    @Autowired
    public Test(TestService testService){
    
        this.testService = testService;
    }

    /** * 登录 */
    @GetMapping("/login")
    public void login(){
    
        testService.login();
    }

    /** * 查询 * @return */
    @GetMapping("/query")
    public int query(){
    
        return 0;
    }
}

测试接口

package com.demo.service;

import com.demo.entity.User;

/** * Description: 测试服务 * * @Author: * @Date: 2022-07-29 21:16 * @version: V1.0.0 */
public interface TestService {
    

    /** * 登录 * @return */
    User login();

}

测试实现

package com.demo.service.impl;

import com.demo.entity.User;
import com.demo.service.TestService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;


/** * Description: 测试服务 * * @Author: * @Date: 2022-07-29 21:19 * @version: V1.0.0 */
@Slf4j
@Service
public class TestServiceImpl implements TestService {
    

    @Override
    public User login() {
    

        checkUserCurrentAddress();
        checkVerificationCode();
        checkDynamicPass();

        return new User("moon",1);
    }

    /** * 校验 用户当前属地 */
    private void checkUserCurrentAddress(){
    
        try {
    
            Thread.sleep(400);
        } catch (InterruptedException e) {
    
            throw new RuntimeException(e);
        }
        log.info("Check User Current Address ...");
    }

    /** * 校验 验证码 */
    private void checkVerificationCode(){
    
        try {
    
            Thread.sleep(800);
        } catch (InterruptedException e) {
    
            throw new RuntimeException(e);
        }
        log.info("Check Verification Code ...");
    }

    /** * 校验 密码 */
    private void checkDynamicPass(){
    
        try {
    
            Thread.sleep(1000);
        } catch (InterruptedException e) {
    
            throw new RuntimeException(e);
        }
        log.info("Check Dynamic Pass ...");
    }
}

静态资源

package com.demo.common;

import com.demo.entity.User;
import org.springframework.stereotype.Component;

import java.util.HashMap;
import java.util.Map;

/** * Description: 静态资源 * * @Author: * @Date: 2022-07-29 22:05 * @version: V1.0.0 */
@Component
public class DemoCommon {
    

    private static Map<String, User> USER_MAP;

    static {
    
        USER_MAP = new HashMap<>();

        USER_MAP.put("moon",new User("moon",18));
        USER_MAP.put("starts",new User("starts",18));
        USER_MAP.put("earth",new User("earth",18));

    }

}