Java獲取當前進程ID以及所有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,它能提供很多管理VM的靜態接口,比如RuntimeMXBean;
RuntimeMXBean是Java虛擬機的運行時管理接口.
獲取所有正在運行着的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");
// 取得所有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");
// 取得所有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");
// 取得所有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;
}
}