Java获取服务器CPU、内存、磁盘信息

最近又有一个项目要加上系统监控，需要查询服务器的CPU、内存等系统信息以及系统服务组件的状态，分享一下最简单的系统信息获取方法，思想是用Java的runtime类执行shell命令进行查询。

相关shell命令

## 查询CPU使用情况
top -b -n 1 | awk /^(%)Cpu/{t1=$2+$4}/^CPU/{t2=$2+$4}END{print t1+t2}

## 查询内存
free -m | awk NR==2{printf "%f
",$3*100/$2}	

## 查询磁盘使用情况
df -h  |grep /dev/mapper |awk {print $5}

附一个工具类：

package com.snow.shell.utils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.thymeleaf.util.StringUtils;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;

public class CommandUtil {
          
   

    public static final Logger logger = LoggerFactory.getLogger(CommandUtil.class);

    public static String getCommandResponse(String[] commands){
          
   
        StringBuilder strBuilder =new StringBuilder();
        try {
          
   
            Runtime runtime = Runtime.getRuntime();
            logger.info(String.format("开始执行shell命令：%s", Arrays.toString(commands)));
            Process exec = runtime.exec(commands);
            exec.waitFor();

            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(exec.getInputStream()));
            BufferedReader errorBufferedReader = new BufferedReader(new InputStreamReader(exec.getErrorStream()));

            String line=null;
            while ((line=bufferedReader.readLine())!=null){
          
   
                if(!StringUtils.isEmpty(line)){
          
   
                    strBuilder.append(line)
                            .append("
");
                }
            }

            while ((line=errorBufferedReader.readLine())!=null){
          
   
                if(!StringUtils.isEmpty(line)){
          
   
                    strBuilder.append(line)
                            .append("
");
                }
            }
        }catch (Exception e){
          
   
            logger.error("执行shell命令发生错误",e);
            return "error";
        }
        return strBuilder.toString();
    }


    public static void executeCommand(String[] commands){
          
   
        try {
          
   
            Runtime runtime = Runtime.getRuntime();
            logger.info(String.format("开始执行shell命令：%s", Arrays.toString(commands)));
            Process exec = runtime.exec(commands);
            exec.waitFor();
        }catch (Exception e){
          
   
            logger.error("执行shell命令发生错误",e);
        }
    }
}

使用示例：

String[] commands = {
          
   "/bin/sh", "-c", "cat /etc/hosts"};
 String commandResponse = CommandUtil.getCommandResponse(commands);
 System.out.println("commandResponse = " + commandResponse);