Java怎么獲取windows系統(tǒng)信息,如CPU,內(nèi)存,文件系統(tǒng),硬盤大小? java實(shí)現(xiàn)這些功能的確有點(diǎn)麻煩,沒有C語言方便.java在windows這方還是弱了一點(diǎn).不過麻煩是麻煩點(diǎn),針對這些功能還是可以實(shí)現(xiàn)了，以下是自己整理的一些公用方法.與大家分享下.

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

 // // 獲取內(nèi)存使用率,這個(gè)方法有點(diǎn)問題，不沒有解決
 // public static String getMemery(){
 // // OperatingSystemMXBean osmxb = (OperatingSystemMXBean)
 // ManagementFactory.getOperatingSystemMXBean();
 // OperatingSystemMXBean osmxb = (OperatingSystemMXBean)
 // ManagementFactory.getMemoryManagerMXBeans();
 // // 總的物理內(nèi)存+虛擬內(nèi)存
 // long totalvirtualMemory = osmxb.getTotalSwapSpaceSize();
 // osmxb.
 //  
 // // 剩余的物理內(nèi)存
 // long freePhysicalMemorySize = osmxb.getFreePhysicalMemorySize();
 // Double
 // compare=(Double)(1-freePhysicalMemorySize*1.0/totalvirtualMemory)*100;
 // String str="內(nèi)存已使用:"+compare.intValue()+"%";
 // return str;
 // }

 // 獲取文件系統(tǒng)使用率
 public static List getDisk() {
  // 操作系統(tǒng)
  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 + ":盤  已使用 " + compare.intValue() + "%";
    list.add(str);
   }
  }
  return list;
 }

 // 單位為G
 public static List getDiskToG() {
  // 操作系統(tǒng)
  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.#"); //這個(gè)方法是對數(shù)字進(jìn)行轉(zhuǎn)換了,大家可以研究下
    double f1 = (free / (1024.0 * 1024 * 1024)); //free的值是字符類型,所以除以1024(1024字節(jié)等于1M)
    String str = c + "盤 可用空間" + df2.format(f1) + "G";
    list.add(str);
   }
  }
  return list;
 }

// 獲得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";
   // 取進(jìn)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 + "%";
  }
 }

// 讀取cpu相關(guān)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;
    }
    // 字段出現(xiàn)順序：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對漢字處理存在問題（把一個(gè)漢字視為一個(gè)字節(jié))，因此在 包含漢字的字符串時(shí)存在隱患，現(xiàn)調(diào)整如下：
  * 
  * @param src
  *            要截取的字符串
  * @param start_idx
  *            開始坐標(biāo)（包括該坐標(biāo))
  * @param end_idx
  *            截止坐標(biāo)（包括該坐標(biāo)）
  * @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;
 }

測試下:

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

 }