Java获取当前进程ID以及所有Java进程的进程ID

首先是获取当前Java运行的Java进程ID，这个是网上常见的，也就是Java程序自身将进程ID打印出来：

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是一个在运行时管理和监控Java VM的工厂类，它能提供很多管理VM的静态接口，比如RuntimeMXBean；
RuntimeMXBean是Java虚拟机的运行时管理接口.

获取所有正在运行着的Java进程

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 {         // 获取监控主机         MonitoredHost local = MonitoredHost.getMonitoredHost("localhost");         // 取得所有在活动的虚拟机集合         Set<?> vmlist = new HashSet<Object>(local.activeVms());         // 遍历集合，输出PID和进程名         for(Object process : vmlist) {             MonitoredVm vm = local.getMonitoredVm(new VmIdentifier("//" + process));             // 获取类名             String processname = MonitoredVmUtil.mainClass(vm, true);             System.out.println(process + " ------> " + processname);         }     }}

MonitoredHost等类位于${JAVA_HOME}/lib/tools.jar

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运行结果：

2752 ------> 5172 ------> com.test.Target5308 ------> com.test.ProcessID

直接根据类找到对应Java进程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;        }        // 获取监控主机        MonitoredHost local = MonitoredHost.getMonitoredHost("localhost");        // 取得所有在活动的虚拟机集合        Set<?> vmlist = new HashSet<Object>(local.activeVms());        // 遍历集合，输出PID和进程名        for(Object process : vmlist) {            MonitoredVm vm = local.getMonitoredVm(new VmIdentifier("//" + process));            // 获取类名            String processname = MonitoredVmUtil.mainClass(vm, true);            if(cls.getName().equals(processname)) {                return ((Integer)process).intValue();            }        }        return -1;    }}

根据类名称找到对应Java进程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;        }        // 获取监控主机        MonitoredHost local = MonitoredHost.getMonitoredHost("localhost");        // 取得所有在活动的虚拟机集合        Set<?> vmlist = new HashSet<Object>(local.activeVms());        // 遍历集合，输出PID和进程名        for (Object process : vmlist) {            MonitoredVm vm = local.getMonitoredVm(new VmIdentifier("//" + process));            // 获取类名            String processname = MonitoredVmUtil.mainClass(vm, true);            if (cls.equals(processname)) {                return ((Integer) process).intValue();            }        }        return -1;    }}