Java，检查当前是否有任何进程 ID 在 Windows 上运行
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Java, Checking if any process ID is currently running on Windows
提问by Roman
Is it possible to check the existence of process from Java in Windows.
是否可以在 Windows 中检查 Java 进程的存在。
I have its possible PID, I want to know if it is still running or not.
我有它可能的PID，我想知道它是否仍在运行。
采纳答案by Silvio Donnini
See if this can help:
看看这是否有帮助：
http://blogs.oracle.com/vaibhav/entry/listing_java_process_from_java
http://blogs.oracle.com/vaibhav/entry/listing_java_process_from_java
That post explains how to get all PIDs running on a Windows machine: you'd have to compare the output of the cmdcall with your PID, instead of printing it.
那篇文章解释了如何让所有 PID 在 Windows 机器上运行：您必须将cmd调用的输出与您的 PID进行比较，而不是打印它。
If you're on Unix-like systems you'd have to use with psinstead of cmd
如果您在类 Unix 系统上，则必须使用 withps而不是cmd
Calling system commands from your java code is not a very portable solution; then again, the implementation of processes varies among operating systems.
从 Java 代码调用系统命令不是一个非常便携的解决方案；再说一次，进程的实现因操作系统而异。
回答by Eric Leschinski
How to check if a pid is running on Windows with Java:
如何使用 Java 检查 pid 是否在 Windows 上运行：
Windows tasklist command:
Windows 任务列表命令：
The DOS command tasklistshows some output on what processes are running:
DOS 命令tasklist显示正在运行的进程的一些输出：
C:\Documents and Settings\eric>tasklist
Image Name PID Session Name Session# Mem Usage
========================= ====== ================ ======== ============
System Idle Process 0 Console 0 28 K
System 4 Console 0 244 K
smss.exe 856 Console 0 436 K
csrss.exe 908 Console 0 6,556 K
winlogon.exe 932 Console 0 4,092 K
....
cmd.exe 3012 Console 0 2,860 K
tasklist.exe 5888 Console 0 5,008 K
C:\Documents and Settings\eric>
The second column is the PID
第二列是PID
You can use tasklistto get info on a specific PID:
您可以使用tasklist获取有关特定 PID 的信息：
tasklist /FI "PID eq 1300"
prints:
印刷：
Image Name PID Session Name Session# Mem Usage
========================= ====== ================ ======== ============
mysqld.exe 1300 Console 0 17,456 K
C:\Documents and Settings\eric>
A response means the PID is running.
响应意味着 PID 正在运行。
If you query a PID that does not exist, you get this:
如果查询不存在的 PID，则会得到以下信息：
C:\Documents and Settings\eric>tasklist /FI "PID eq 1301"
INFO: No tasks running with the specified criteria.
C:\Documents and Settings\eric>
A Java function could do the above automatically
Java 函数可以自动执行上述操作
This function will only work on Windows systems that have tasklistavailable.
此功能仅适用于tasklist可用的Windows 系统。
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
public class IsPidRunningTest {
public static void main(String[] args) {
//this function prints all running processes
showAllProcessesRunningOnWindows();
//this prints whether or not processID 1300 is running
System.out.println("is PID 1300 running? " +
isProcessIdRunningOnWindows(1300));
}
/**
* Queries {@code tasklist} if the process ID {@code pid} is running.
* @param pid the PID to check
* @return {@code true} if the PID is running, {@code false} otherwise
*/
public static boolean isProcessIdRunningOnWindows(int pid){
try {
Runtime runtime = Runtime.getRuntime();
String cmds[] = {"cmd", "/c", "tasklist /FI \"PID eq " + pid + "\""};
Process proc = runtime.exec(cmds);
InputStream inputstream = proc.getInputStream();
InputStreamReader inputstreamreader = new InputStreamReader(inputstream);
BufferedReader bufferedreader = new BufferedReader(inputstreamreader);
String line;
while ((line = bufferedreader.readLine()) != null) {
//Search the PID matched lines single line for the sequence: " 1300 "
//if you find it, then the PID is still running.
if (line.contains(" " + pid + " ")){
return true;
}
}
return false;
} catch (Exception ex) {
ex.printStackTrace();
System.out.println("Cannot query the tasklist for some reason.");
System.exit(0);
}
return false;
}
/**
* Prints the output of {@code tasklist} including PIDs.
*/
public static void showAllProcessesRunningOnWindows(){
try {
Runtime runtime = Runtime.getRuntime();
String cmds[] = {"cmd", "/c", "tasklist"};
Process proc = runtime.exec(cmds);
InputStream inputstream = proc.getInputStream();
InputStreamReader inputstreamreader = new InputStreamReader(inputstream);
BufferedReader bufferedreader = new BufferedReader(inputstreamreader);
String line;
while ((line = bufferedreader.readLine()) != null) {
System.out.println(line);
}
} catch (Exception ex) {
ex.printStackTrace();
System.out.println("Cannot query the tasklist for some reason.");
}
}
}
The Java code above prints a list of all running processes then prints:
上面的 Java 代码打印所有正在运行的进程的列表，然后打印：
is PID 1300 running? true
回答by aprodan
Code:
代码：
boolean isStillAllive(String pidStr) {
String OS = System.getProperty("os.name").toLowerCase();
String command = null;
if (OS.indexOf("win") >= 0) {
log.debug("Check alive Windows mode. Pid: [{}]", pidStr);
command = "cmd /c tasklist /FI \"PID eq " + pidStr + "\"";
return isProcessIdRunning(pidStr, command);
} else if (OS.indexOf("nix") >= 0 || OS.indexOf("nux") >= 0) {
log.debug("Check alive Linux/Unix mode. Pid: [{}]", pidStr);
command = "ps -p " + pidStr;
return isProcessIdRunning(pidStr, command);
}
log.debug("Default Check alive for Pid: [{}] is false", pidStr);
return false;
}
boolean isProcessIdRunning(String pid, String command) {
log.debug("Command [{}]",command );
try {
Runtime rt = Runtime.getRuntime();
Process pr = rt.exec(command);
InputStreamReader isReader = new InputStreamReader(pr.getInputStream());
BufferedReader bReader = new BufferedReader(isReader);
String strLine = null;
while ((strLine= bReader.readLine()) != null) {
if (strLine.contains(" " + pid + " ")) {
return true;
}
}
return false;
} catch (Exception ex) {
log.warn("Got exception using system command [{}].", command, ex);
return true;
}
}
回答by Gal Levy
- import jna from Maven to your project
- after maven was update you can use:
- 将 jna 从 Maven 导入到您的项目中
- Maven 更新后，您可以使用：
int myPid = Kernel32.INSTANCE.GetCurrentProcessId();
int myPid = Kernel32.INSTANCE.GetCurrentProcessId();
