Java獲取當前進程ID以及全部Java進程的進程ID

Java獲取當前進程ID以及全部Java進程的進程ID

首先是獲取當前Java運行的Java進程ID，這個是網上常見的，也就是Java程序自身將進程ID打印出來：

package com.test;

import java.lang.management.ManagementFactory;
import java.lang.management.RuntimeMXBean;

public class Target {

    public static void main(String[] args) throws InterruptedException {
        System.out.println(getProcessID());
        while(true) {
            Thread.sleep(10000);
        }
    }

    public static final int getProcessID() {  
        RuntimeMXBean runtimeMXBean = ManagementFactory.getRuntimeMXBean();
        System.out.println(runtimeMXBean.getName());
        return Integer.valueOf(runtimeMXBean.getName().split("@")[0])  
                .intValue();  
    } 

}

ManagementFactory是一個在運行時管理和監控Java VM的工廠類，它能提供不少管理VM的靜態接口，好比 RuntimeMXBean；
RuntimeMXBean是Java虛擬機的運行時管理接口.

獲取全部正在運行着的Java進程

package com.test;

import java.util.HashSet;
import java.util.Set;

import sun.jvmstat.monitor.MonitoredHost;
import sun.jvmstat.monitor.MonitoredVm;
import sun.jvmstat.monitor.MonitoredVmUtil;
import sun.jvmstat.monitor.VmIdentifier;

public class ProcessID {

    public static void main(String[] args) throws Exception {
         // 獲取監控主機
         MonitoredHost local = MonitoredHost.getMonitoredHost("localhost");
         // 取得全部在活動的虛擬機集合
         Set<?> vmlist = new HashSet<Object>(local.activeVms());
         // 遍歷集合，輸出PID和進程名
         for(Object process : vmlist) {
             MonitoredVm vm = local.getMonitoredVm(new VmIdentifier("//" + process));
             // 獲取類名
             String processname = MonitoredVmUtil.mainClass(vm, true);
             System.out.println(process + " ------> " + processname);
         }
     }
}

MonitoredHost等類位於${JAVA_HOME}/lib/tools.jar

_
運行結果：

2752 ------> 
5172 ------> com.test.Target
5308 ------> com.test.ProcessID

直接根據類找到對應Java進程ID的方法

package com.test;

import java.net.URISyntaxException;
import java.util.HashSet;
import java.util.Set;

import sun.jvmstat.monitor.MonitorException;
import sun.jvmstat.monitor.MonitoredHost;
import sun.jvmstat.monitor.MonitoredVm;
import sun.jvmstat.monitor.MonitoredVmUtil;
import sun.jvmstat.monitor.VmIdentifier;

public class ProcessID {

    public static void main(String[] args) throws Exception {
         int pid = getProcess(Target.class);
         System.out.println("PID: "+pid);
    }

    public static int getProcess(Class<?> cls) throws MonitorException, URISyntaxException {
        if(cls == null) {
            return -1;
        }

        // 獲取監控主機
        MonitoredHost local = MonitoredHost.getMonitoredHost("localhost");
        // 取得全部在活動的虛擬機集合
        Set<?> vmlist = new HashSet<Object>(local.activeVms());
        // 遍歷集合，輸出PID和進程名
        for(Object process : vmlist) {
            MonitoredVm vm = local.getMonitoredVm(new VmIdentifier("//" + process));
            // 獲取類名
            String processname = MonitoredVmUtil.mainClass(vm, true);
            if(cls.getName().equals(processname)) {
                return ((Integer)process).intValue();
            }
        }
        return -1;
    }
}

根據類名稱找到對應Java進程ID的方法

package com.example.demo;

import sun.jvmstat.monitor.*;

import java.net.URISyntaxException;
import java.util.HashSet;
import java.util.Set;

public class ProcessID2 {
    public static void main(String[] args) throws Exception {
        int pid = getProcess("cn.usr.demo.DemoApplication");
        System.out.println("PID: " + pid);
    }

    public static int getProcess(String cls) throws MonitorException, URISyntaxException {
        if (cls == null) {
            return -1;
        }

        // 獲取監控主機
        MonitoredHost local = MonitoredHost.getMonitoredHost("localhost");
        // 取得全部在活動的虛擬機集合
        Set<?> vmlist = new HashSet<Object>(local.activeVms());
        // 遍歷集合，輸出PID和進程名
        for (Object process : vmlist) {
            MonitoredVm vm = local.getMonitoredVm(new VmIdentifier("//" + process));
            // 獲取類名
            String processname = MonitoredVmUtil.mainClass(vm, true);
            if (cls.equals(processname)) {
                return ((Integer) process).intValue();
            }
        }
        return -1;
    }
}