如何检查是否正在运行某个进程 - java on linux [英] How to check is a certain process is running - java on linux

问题描述

我需要检查java程序中是否正在运行非java进程（按进程名称） - 非常类似于 Java - 如何检查另一个（非Java）进程是否在Linux上运行。

解决方案没问题，但仍然需要打开一个系统调用过程，我想避免这种情况。

是否有一种纯java方式来获取正在运行的进程列表在linux上？

I need to check if a non-java process is running (by process name) inside a java program - very similar to the issue in Java - how to check whether another (non-Java) process is running on Linux.
The solution is ok, but it still needs to open a system call process, and I'd like to avoid this.
Is there a pure-java way to get a list of running processes on linux?

推荐答案

一个可能的解决方案可能是探索 proc 条目。实际上，这就是 top 的方式，其他人可以访问正在运行的进程列表。

A possible solution might be explorer the proc entries. Indeed, this is how top and others gain access to the list of running process.

我不完全确定这是你想要的，但它可以给你一些线索：

I'm not completely sure if this is what your looking for, but it can give you some clue:

    import java.awt.Desktop;
    import java.io.BufferedReader;
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileNotFoundException;
    import java.io.IOException;
    import java.io.InputStreamReader;

    public class OpenFolder {
        public static void main(String[] args) throws IOException {
            System.out.println(findProcess("process_name_here"));
        }

        public static boolean findProcess(String processName) throws IOException {
            String filePath = new String("");
            File directory = new File("/proc");
            File[] contents = directory.listFiles();
            boolean found = false;
            for (File f : contents) {
                if (f.getAbsolutePath().matches("\\/proc\\/\\d+")) {
                    filePath = f.getAbsolutePath().concat("/status");
                    if (readFile(filePath, processName))
                        found = true;
                }
            }
            return found;
        }

        public static boolean readFile(String filename, String processName)
        throws IOException {
            FileInputStream fstream = new FileInputStream(filename);
            BufferedReader br = new BufferedReader(new InputStreamReader(fstream));
            String strLine;
            strLine = br.readLine().split(":")[1].trim();
            br.close();
            if (strLine.equals(processName))
                return true;
            else
                return false;
        }
    }

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