private static double getCpuRateForLinux(){
InputStream is = null;
InputStreamReader isr = null;
BufferedReader brStat = null;
StringTokenizer tokenStat = null;
try{
System.out.println("Get usage rate of CUP , linux version: "+linuxVersion);
Process process = Runtime.getRuntime().exec("top -b -n 1");
is = process.getInputStream();
isr = new InputStreamReader(is);
brStat = new BufferedReader(isr);
if(linuxVersion.equals("2.4")){
brStat.readLine();
brStat.readLine();
brStat.readLine();
brStat.readLine();
tokenStat = new StringTokenizer(brStat.readLine());
tokenStat.nextToken();
tokenStat.nextToken();
String user = tokenStat.nextToken();
tokenStat.nextToken();
String system = tokenStat.nextToken();
tokenStat.nextToken();
String nice = tokenStat.nextToken();
System.out.println(user+" , "+system+" , "+nice);
user = user.substring(0,user.indexOf("%"));
system = system.substring(0,system.indexOf("%"));
nice = nice.substring(0,nice.indexOf("%"));
float userUsage = new Float(user).floatValue();
float systemUsage = new Float(system).floatValue();
float niceUsage = new Float(nice).floatValue();
return (userUsage+systemUsage+niceUsage)/100;
}else{
brStat.readLine();
brStat.readLine();
tokenStat = new StringTokenizer(brStat.readLine());
tokenStat.nextToken();
tokenStat.nextToken();
tokenStat.nextToken();
tokenStat.nextToken();
tokenStat.nextToken();
tokenStat.nextToken();
tokenStat.nextToken();
String cpuUsage = tokenStat.nextToken();
System.out.println("CPU idle : "+cpuUsage);
Float usage = new Float(cpuUsage.substring(0,cpuUsage.indexOf("%")));
return (1-usage.floatValue()/100);
}
} catch(IOException ioe){
System.out.println(ioe.getMessage());
freeResource(is, isr, brStat);
return 1;
} finally{
freeResource(is, isr, brStat);
}
}
private static void freeResource(InputStream is, InputStreamReader isr, BufferedReader br){
try{
if(is!=null)
is.close();
if(isr!=null)
isr.close();
if(br!=null)
br.close();
}catch(IOException ioe){
System.out.println(ioe.getMessage());
}
}
/**
* 获得CPU使用率.
* @return 返回cpu使用率
* @author GuoHuang
*/
private double 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 Double.valueOf(
PERCENT * (busytime) / (busytime + idletime))
.doubleValue();
} else {
return 0.0;
}
} catch (Exception ex) {
ex.printStackTrace();
return 0.0;
}
}
/**
* 读取CPU信息.
* @param proc
* @return
* @author GuoHuang
*/
private 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 = Bytes.substring(line, capidx, cmdidx - 1)
.trim();
String cmd = Bytes.substring(line, cmdidx, kmtidx - 1).trim();
if (cmd.indexOf("wmic.exe") >= 0) {
continue;
}
// log.info("line="+line);
if (caption.equals("System Idle Process")
|| caption.equals("System")) {
idletime += Long.valueOf(
Bytes.substring(line, kmtidx, rocidx - 1).trim())
.longValue();
idletime += Long.valueOf(
Bytes.substring(line, umtidx, wocidx - 1).trim())
.longValue();
continue;
}
kneltime += Long.valueOf(
Bytes.substring(line, kmtidx, rocidx - 1).trim())
.longValue();
usertime += Long.valueOf(
Bytes.substring(line, umtidx, wocidx - 1).trim())
.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;
}
上面方法不行，下面的可以 String result = "";
try {
File file = File.createTempFile("tmp", ".vbs");
file.deleteOnExit();
FileWriter fw = new java.io.FileWriter(file);
String vbs ="Set objProc = GetObject(\"winmgmts:\\\\.\\root\\cimv2:win32_processor='cpu0'\")\n" +
"WScript.Echo \"CPU Load Percentage: \"& chr(13) & chr(10) & Round(objProc.LoadPercentage,2) & \"%\"";
fw.write(vbs);
fw.close();
Process p = Runtime.getRuntime().exec("cscript //NoLogo " + file.getPath());
BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line;
while ((line = input.readLine()) != null) {
result += line;
}
input.close();
file.delete();
} catch (Exception e) {
e.fillInStackTrace();
}
if (result.trim().length() < 1 || result == null) {
}else{
System.out.println(result.trim());
}