获取操作系统级别的系统信息 [英] get OS-level system information

问题描述

我目前正在构建一个Java应用程序，最终可能会在许多不同的平台上运行，但主要是Solaris，Linux和Windows的变种。

I'm currently building a Java app that could end up being run on many different platforms, but primarily variants of Solaris, Linux and Windows.

有没有人能够成功提取诸如当前使用的磁盘空间，CPU利用率和底层操作系统中使用的内存等信息吗？那个Java应用程序本身正在消耗什么呢？

Has anyone been able to successfully extract information such as the current disk space used, CPU utilisation and memory used in the underlying OS? What about just what the Java app itself is consuming?

我希望在不使用JNI的情况下获取这些信息。

Preferrably I'd like to get this information without using JNI.

推荐答案

您可以从Runtime类中获取一些有限的内存信息。它确实不是你想要的，但我认为我会为了完整性而提供它。这是一个小例子。编辑：您还可以从java.io.File类获取磁盘使用信息。磁盘空间使用量需要Java 1.6或更高版本。

You can get some limited memory information from the Runtime class. It really isn't exactly what you are looking for, but I thought I would provide it for the sake of completeness. Here is a small example. You can also get disk usage information from the java.io.File class. The disk space usage stuff requires Java 1.6 or higher.

public class Main {
  public static void main(String[] args) {
    /* Total number of processors or cores available to the JVM */
    System.out.println("Available processors (cores): " + 
        Runtime.getRuntime().availableProcessors());

    /* Total amount of free memory available to the JVM */
    System.out.println("Free memory (bytes): " + 
        Runtime.getRuntime().freeMemory());

    /* This will return Long.MAX_VALUE if there is no preset limit */
    long maxMemory = Runtime.getRuntime().maxMemory();
    /* Maximum amount of memory the JVM will attempt to use */
    System.out.println("Maximum memory (bytes): " + 
        (maxMemory == Long.MAX_VALUE ? "no limit" : maxMemory));

    /* Total memory currently available to the JVM */
    System.out.println("Total memory available to JVM (bytes): " + 
        Runtime.getRuntime().totalMemory());

    /* Get a list of all filesystem roots on this system */
    File[] roots = File.listRoots();

    /* For each filesystem root, print some info */
    for (File root : roots) {
      System.out.println("File system root: " + root.getAbsolutePath());
      System.out.println("Total space (bytes): " + root.getTotalSpace());
      System.out.println("Free space (bytes): " + root.getFreeSpace());
      System.out.println("Usable space (bytes): " + root.getUsableSpace());
    }
  }
}

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