java获取cpu,内存,磁盘等信息

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java获取cpu,内存,磁盘等信息
原文：java获取cpu,内存,磁盘等信息
源代码下载地址：http://www.zuidaima.com/share/1550463331306496.htm
package com.zuidaima.util;import java.io.File;import java.io.InputStreamReader; import java.io.LineNumberReader; import java.util.ArrayList; import java.util.List; import sun.management.ManagementFactory;import com.sun.management.OperatingSystemMXBean;/** * 获取windows系统信息（CPU,内存,文件系统） * @author www.zuidaima.com * */ public class cpu {     private static final int CPUTIME = 500;     private static final int PERCENT = 100;     private static final int FAULTLENGTH = 10;     public static void main(String[] args) {     System.out.println(getCpuRatioForWindows());     System.out.println(getMemery());     System.out.println(getDisk()); } //获取内存使用率 public static String getMemery(){   OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();   // 总的物理内存+虚拟内存   long totalvirtualMemory = osmxb.getTotalSwapSpaceSize();   // 剩余的物理内存   long freePhysicalMemorySize = osmxb.getFreePhysicalMemorySize();  System.out.println("总  的  内 存"+(totalvirtualMemory/1024.0/1024.0/1024.0));  System.out.println("使用的内存"+((totalvirtualMemory-freePhysicalMemorySize)/1024.0/1024.0/1024.0));  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<String> getDisk() {   // 操作系统   List<String> list=new ArrayList<String>();   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; } //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：    * @author www.zuidaima.com    * @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;   } }
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