java获取windows系统信息（CPU,内存,文件系统,硬盘大小）

　Java怎么获取windows系统信息,如CPU,内存,文件系统,硬盘大小? java实现这些功能的确有点麻烦,没有C语言方便.java在windows这方还是弱了一点.不过麻烦是麻烦点,针对这些功能还是可以实现了，以下是 自己整理的一些公用方法.与大家分享下.

 

 private static final int CPUTIME = 500;
 private static final int PERCENT = 100;
 private static final int FAULTLENGTH = 10;

 

 // // 获取内存使用率,这个方法有点问题，不没有解决
 // public static String getMemery(){
 // // OperatingSystemMXBean osmxb = (OperatingSystemMXBean)
 // ManagementFactory.getOperatingSystemMXBean();
 // OperatingSystemMXBean osmxb = (OperatingSystemMXBean)
 // ManagementFactory.getMemoryManagerMXBeans();
 // // 总的物理内存+虚拟内存
 // long totalvirtualMemory = osmxb.getTotalSwapSpaceSize();
 // osmxb.
 // 
 // // 剩余的物理内存
 // long freePhysicalMemorySize = osmxb.getFreePhysicalMemorySize();
 // Double
 // compare=(Double)(1-freePhysicalMemorySize*1.0/totalvirtualMemory)*100;
 // String str="内存已使用:"+compare.intValue()+"%";
 // return str;
 // }

 // 获取文件系统使用率
 public static List getDisk() {
  // 操作系统
  List list = new ArrayList();
  for (char c = 'A'; c <= 'Z'; c++) {
   String dirName = c + ":/";
   File win = new File(dirName);
   if (win.exists()) {
    long total = (long) win.getTotalSpace();
    long free = (long) win.getFreeSpace();
    Double compare = (Double) (1 - free * 1.0 / total) * 100;
    String str = c + ":盘  已使用 " + compare.intValue() + "%";
    list.add(str);
   }
  }
  return list;
 }

 

 // 单位为G
 public static List getDiskToG() {
  // 操作系统
  List list = new ArrayList();
  for (char c = 'A'; c <= 'Z'; c++) {
   String dirName = c + ":/";
   File win = new File(dirName);
   if (win.exists()) {
    long total = (long) win.getTotalSpace();
    long free = (long) win.getFreeSpace();
    DecimalFormat df2 = new DecimalFormat("###0.#"); //这个方法是对数字进行转换了,大家可以研究下
    double f1 = (free / (1024.0 * 1024 * 1024)); //free的值是字符类型,所以除以1024(1024字节等于1M)
    String str = c + "盘 可用空间" + df2.format(f1) + "G";
    list.add(str);
   }
  }
  return list;
 }

 

// 获得cpu使用率
 public static String getCpuRatioForWindows() {
  try {
   String procCmd = System.getenv("windir")
     + " \\system32\\wbem\\wmic.exe process get Caption,CommandLine,KernelModeTime,ReadOperationCount,

ThreadCount,UserModeTime,WriteOperationCount";
   // 取进程信息
   long[] c0 = readCpu(Runtime.getRuntime().exec(procCmd));
   Thread.sleep(CPUTIME);
   long[] c1 = readCpu(Runtime.getRuntime().exec(procCmd));
   if (c0 != null && c1 != null) {
    long idletime = c1[0] - c0[0];
    long busytime = c1[1] - c0[1];
    return "CPU使用率:"
      + Double.valueOf(
        PERCENT * (busytime) * 1.0
          / (busytime + idletime)).intValue()
      + "%";
   } else {
    return "CPU使用率:" + 0 + "%";
   }
  } catch (Exception ex) {
   ex.printStackTrace();
   return "CPU使用率:" + 0 + "%";
  }
 }

 

 

// 读取cpu相关信息
 private static long[] readCpu(final Process proc) {
  long[] retn = new long[2];
  try {
   proc.getOutputStream().close();
   InputStreamReader ir = new InputStreamReader(proc.getInputStream());
   LineNumberReader input = new LineNumberReader(ir);
   String line = input.readLine();
   if (line == null || line.length() < FAULTLENGTH) {
    return null;
   }
   int capidx = line.indexOf("Caption");
   int cmdidx = line.indexOf("CommandLine");
   int rocidx = line.indexOf("ReadOperationCount");
   int umtidx = line.indexOf("UserModeTime");
   int kmtidx = line.indexOf("KernelModeTime");
   int wocidx = line.indexOf("WriteOperationCount");
   long idletime = 0;
   long kneltime = 0;
   long usertime = 0;
   while ((line = input.readLine()) != null) {
    if (line.length() < wocidx) {
     continue;
    }
    // 字段出现顺序：Caption,CommandLine,KernelModeTime,ReadOperationCount,
    // ThreadCount,UserModeTime,WriteOperation
    String caption = substring(line, capidx, cmdidx - 1).trim();
    String cmd = substring(line, cmdidx, kmtidx - 1).trim();
    if (cmd.indexOf("wmic.exe") >= 0) {
     continue;
    }
    String s1 = substring(line, kmtidx, rocidx - 1).trim();
    String s2 = substring(line, umtidx, wocidx - 1).trim();
    if (caption.equals("System Idle Process")
      || caption.equals("System")) {
     if (s1.length() > 0)
      idletime += Long.valueOf(s1).longValue();
     if (s2.length() > 0)
      idletime += Long.valueOf(s2).longValue();
     continue;
    }
    if (s1.length() > 0)
     kneltime += Long.valueOf(s1).longValue();
    if (s2.length() > 0)
     usertime += Long.valueOf(s2).longValue();
   }
   retn[0] = idletime;
   retn[1] = kneltime + usertime;
   return retn;
  } catch (Exception ex) {
   ex.printStackTrace();
  } finally {
   try {
    proc.getInputStream().close();
   } catch (Exception e) {
    e.printStackTrace();
   }
  }
  return null;
 }

 

/**
  * 由于String.subString对汉字处理存在问题（把一个汉字视为一个字节)，因此在 包含汉字的字符串时存在隐患，现调整如下：
  *
  * @param src
  *            要截取的字符串
  * @param start_idx
  *            开始坐标（包括该坐标)
  * @param end_idx
  *            截止坐标（包括该坐标）
  * @return
  */
 private static String substring(String src, int start_idx, int end_idx) {
  byte[] b = src.getBytes();
  String tgt = "";
  for (int i = start_idx; i <= end_idx; i++) {
   tgt += (char) b[i];
  }
  return tgt;
 }

测试下:

 public static void main(String[] args) {
  System.out.println(getCpuRatioForWindows());
  // System.out.println(getMemery());
  System.out.println(getDisk());
  System.out.println(getDiskToG());

 }