Arthas--基础--02--安装

Arthas–基础–02–安装

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1、准备

1.1、下载Arthas

cd /root/arthas
wget https://arthas.aliyun.com/arthas-boot.jar

1.2、下载测试demo和启动

cd /root/arthas
wget https://arthas.aliyun.com/math-game.jar
# 启动
java -jar math-game.jar

math-game是一个简单的程序，每隔一秒生成一个随机数，再执行质因数分解，并打印出分解结果。

2、安装

2.1、安装Arthas

java -jar arthas-boot.jar

2.2、卸载Arthas

# 删除对应的目录就好
rm -rf /root/arthas

2.3、退出 arthas

命令	说明
quit或者exit	退出当前的连接，Attach 到目标进程上的 arthas 还会继续运行，端口会保持开放，下次连接时可以直接连接上。
stop	完全退出 arthas

3、附录

3.1、math-game源码

import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.concurrent.TimeUnit;
/**
 * MathGame.<br>
 * @author gongqiang <br>
 * @version 1.0.0 2021年6月4日<br>
 * @see 
 * @since JDK 1.5.0
 */
public class MathGame {
    private static Random random = new Random();
    private int illegalArgumentCount = 0;
 
    public List<Integer> primeFactors(int number) {
		if (number < 2) {
			++this.illegalArgumentCount;
            throw new IllegalArgumentException("number is: " + number + ", need >= 2");
        }
        ArrayList<Integer> result = new ArrayList<Integer>();
		int i = 2;
		while (i <= number) {
			if (number % i == 0) {
				result.add(i);
				number /= i;
				i = 2;
                continue;
            }
			++i;
        }
		return result;
    }
 
    public static void main(String[] args) throws InterruptedException {
        MathGame game = new MathGame();
        while (true) {
			game.run();
			TimeUnit.SECONDS.sleep(1L);
        }
    }
 
    public void run() throws InterruptedException {
        try {
			int number = random.nextInt() / 10000;
			List<Integer> primeFactors = this.primeFactors(number);
			MathGame.print(number, primeFactors);
        }
        catch (Exception e) {
			System.out.println(String.format("illegalArgumentCount:%3d,", this.illegalArgumentCount) + e.getMessage());
        }
    }
 
    public static void print(int number, List<Integer> primeFactors) {
        StringBuffer sb = new StringBuffer(number + "=");
		for (int factor : primeFactors) {
			sb.append(factor).append('*');
        }
		if (sb.charAt(sb.length() - 1) == '*') {
			sb.deleteCharAt(sb.length() - 1);
        }
		System.out.println(sb);
    }
}