java获取服务器CPU,内存，硬盘使用量

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/**
* <获取系统信息类>
* <获取系统信息，如CPU、内存、硬盘使用情况>
* @author wenkaixuan
* @version [版本号, 2012-5-9]
* @see [相关类/方法]
* @since [产品/模块版本]
*/
public class GetSystemInfo
{
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
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();
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：
* @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;
}