Question

java怎么判断某个进程是否存在

Answer 1

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;

class StreamDrainer implements Runnable {
private InputStream ins;

public StreamDrainer(InputStream ins) {
this.ins = ins;
}

public void run() {
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
ins));
String line = null;
while ((line = reader.readLine()) != null) {
//这判断你的进程
if(line.indexOf("QQ.exe")!=-1){
System.out.println("有QQ");
}
}
} catch (Exception e) {
e.printStackTrace();
}
}

}

public class TestRunCmd {
public static void main(String[] args) {
String[] cmd = new String[] { "cmd.exe", "/C", "wmic process get name" };
try {
Process process = Runtime.getRuntime().exec(cmd);
new Thread(new StreamDrainer(process.getInputStream())).start();
new Thread(new StreamDrainer(process.getErrorStream())).start();
process.getOutputStream().close();
} catch (Exception e) {
e.printStackTrace();
}
}
}

试试这样，我用的线程来做，你改run方法里面的进程名就好了

Answer 2

linux的话，Process p = Runtime.getRuntime().exec("ps -e");然后处理它的output。
windows的话， Process p = Runtime.getRuntime().exec(System.getenv("windir") +"\\system32\\"+"tasklist.exe");然后处理output