获取某个进程占用内存比例

代码

package test02.getMemory;

import oshi.SystemInfo;
import oshi.hardware.GlobalMemory;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;

/**
 * @Author yxchun
 * @date 2022/8/6  15:17
 * @Des  获取具体进程的占用内存大小
 **/
public class MemoryList {

    private static List<String> specifiedCaption=new ArrayList<String>();

    public  static void exec(){
        specifiedCaption.add("idea64.exe");
        specifiedCaption.add("java.exe");
        specifiedCaption.add("mysqld.exe");

        String execStr="";
        for(String name:specifiedCaption){
            execStr = "tasklist | findstr  /i "+name;
            String [] cmd={"cmd","/C",execStr};
            try {
                Process process =Runtime.getRuntime().exec(cmd);
                BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream(),"utf-8"));
                String str="";
//            System.out.println(reader.readLine());
                while((str=reader.readLine())!=null){
                    if("".equals(str)){
                        System.out.println("kong");
                        continue;
                    }
//                System.out.println(str);
                    System.out.println(name+" : "+getMemory(str));
                }
               reader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }

        }



    }


    public static void main(String[] args) {
        exec();
    }

    public static String getMemory(String str){
//        System.out.println(str);
        String[] s = str.split("  ");
        String  result=null;
        for(String ss:s){
            if(ss.contains("K")){
                result=ss;            }

        }
        result = result.replace(",","");
//        System.out.println(result);
        double i=Double.parseDouble(result.substring(0, (result.length()-2)));
        double i2=getAllMemory();
        double rr = i/(i2/1024);

        //8360611840
        DecimalFormat df = new DecimalFormat("0.00%");
        return df.format(rr);
    }

    public static double getAllMemory(){
        SystemInfo systemInfo = new SystemInfo();
        GlobalMemory memory = systemInfo.getHardware().getMemory();
        return memory.getTotal();

    }
}

 

需要jar包

        <dependency>
            <groupId>com.github.oshi</groupId>
            <artifactId>oshi-core</artifactId>
            <version>3.5.0</version>
        </dependency>

解析：

执行命令

  String [] cmd={"cmd","/C","tasklist | findstr  /i idea64.exe"};

尝试在命令行运行

 读取命令行运行结果

Process process =Runtime.getRuntime().exec(cmd);
BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream(),"utf-8"));

获取当前计算机内存大小

 SystemInfo systemInfo = new SystemInfo();
 GlobalMemory memory = systemInfo.getHardware().getMemory();
 return memory.getTotal();