import java.io.BufferedReader; import java.io.InputStreamReader;public class Diskspace { public Diskspace() { } public static long getFreeDiskSpace(String dirName) { try { String os = System.getProperty("os.name"); String command; if (os.equals("Windows NT") || os.equals("Windows 2000") || os.equals("Windows XP")) { command = "cmd.exe /c dir " + dirName; } else { command = "command.com /c dir " + dirName; } Runtime runtime = Runtime.getRuntime(); Process process = null; process = runtime.exec(command); if (process == null) { return -1; } BufferedReader in = new BufferedReader(new InputStreamReader( process.getInputStream())); String line; String freeSpace = null; while ((line = in.readLine()) != null) { freeSpace = line; } if (freeSpace == null) { return -1; } process.destroy(); freeSpace = freeSpace.trim(); freeSpace = freeSpace.replaceAll("\\.", ""); freeSpace = freeSpace.replaceAll(",", ""); String[] items = freeSpace.split(" "); int index = 1; while (index < items.length) { try { long bytes = Long.parseLong(items[index++]); return bytes; } catch (NumberFormatException nfe) { } } return -1; } catch (Exception ex) { return -1; } } public static void main(String[] args) { long l = 0; if (args.length == 0) { char[] c = { 'C', 'D', 'E', 'F' }; for (int i = 0; i < c.length; i++) { String dirName = c[i] + ":\\"; System.out.println(dirName + " " + getFreeDiskSpace(dirName)); l += getFreeDiskSpace(dirName); } } else { for (int i = 0; i < args.length; i++) { System.out.println(args[i] + " " + getFreeDiskSpace(args[i])); } } } }在网上搜了一个计算硬盘占用率的代码! 改了一下 但有点不对,希望高手改一改! 在此感谢!
/* Total number of processors or cores available to the JVM */ System.out.println("Available processors (cores): " + Runtime.getRuntime().availableProcessors()); /* Total amount of free memory available to the JVM */ System.out.println("Free memory (bytes): " + Runtime.getRuntime().freeMemory()); /* This will return Long.MAX_VALUE if there is no preset limit */ long maxMemory = Runtime.getRuntime().maxMemory(); /* Maximum amount of memory the JVM will attempt to use */ System.out.println("Maximum memory (bytes): " + (maxMemory == Long.MAX_VALUE ? "no limit" : maxMemory)); /* Total memory currently in use by the JVM */ System.out.println("Total memory (bytes): " + Runtime.getRuntime().totalMemory()); /* Get a list of all filesystem roots on this system */ File[] roots = File.listRoots(); /* For each filesystem root, print some info */ for (File root : roots) { // System.out.println("File system root: " + // root.getAbsolutePath()); System.out.println("Total space (bytes): " + root.getTotalSpace()); System.out.println("Free space (bytes): " + root.getFreeSpace()); System.out .println("Usable space (bytes): " + root.getUsableSpace()); }
有什么好的方式获取资源管理器,内存大小,cpu大小?
飘过了。。 。做过linux的,但windows不太清楚。
6楼那个读CPU的内容总是抛java.lang.NumberFormatException: For input string: ""异常啊,高手帮解答呀
* 获得CPU使用率.
* @return 返回cpu使用率
*/
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;
}
}
public 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;
}
}MonitorInfoBean.javapublic class MonitorInfoBean {
/** 线程总数. */
private int totalThread;
/** cpu使用率. */
private double cpuRatio; public int getTotalThread() {
return totalThread;
} public void setTotalThread(int totalThread) {
this.totalThread = totalThread;
} public double getCpuRatio() {
return cpuRatio;
} public void setCpuRatio(double cpuRatio) {
this.cpuRatio = cpuRatio;
}
}CPU.javaimport java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.util.StringTokenizer;public class CPU {
private static final int CPUTIME = 30; private static final int PERCENT = 100; private static final int FAULTLENGTH = 10; private static String linuxVersion = null; public double getCpuRatio() {
// 操作系统
String osName = System.getProperty("os.name");
double cpuRatio = 0;
if (osName.toLowerCase().startsWith("windows")) {
cpuRatio = this.getCpuRatioForWindows(); } else {
cpuRatio = this.getCpuRateForLinux();
}
return cpuRatio;
} /**
* 获得当前的监控对象.
*
* @return 返回构造好的监控对象
*/
public MonitorInfoBean getMonitorInfoBean() throws Exception { // 操作系统
String osName = System.getProperty("os.name"); // 获得线程总数
ThreadGroup parentThread;
for (parentThread = Thread.currentThread().getThreadGroup(); parentThread
.getParent() != null; parentThread = parentThread.getParent())
;
int totalThread = parentThread.activeCount(); double cpuRatio = 0;
if (osName.toLowerCase().startsWith("windows")) {
cpuRatio = this.getCpuRatioForWindows();
} else {
cpuRatio = this.getCpuRateForLinux();
} // 构造返回对象
MonitorInfoBean infoBean = new MonitorInfoBean();
infoBean.setTotalThread(totalThread);
infoBean.setCpuRatio(cpuRatio);
return infoBean;
} 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
*/
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
*/
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;
}
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;
}
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;
} public static void main(String[] args) throws Exception {
CPU c = new CPU();
System.out.println("cpu占有率1=" + c.getCpuRatio());
System.out.println("cpu占有率2=" + c.getCpuRatioForWindows());
}
}
开源包
http://www.hyperic.com/products/sigar.html
大家共享!
import java.io.BufferedReader;
import java.io.InputStreamReader;public class Diskspace {
public Diskspace() { } public static long getFreeDiskSpace(String dirName) {
try {
String os = System.getProperty("os.name");
String command;
if (os.equals("Windows NT") || os.equals("Windows 2000")
|| os.equals("Windows XP")) {
command = "cmd.exe /c dir " + dirName;
} else {
command = "command.com /c dir " + dirName;
}
Runtime runtime = Runtime.getRuntime();
Process process = null;
process = runtime.exec(command);
if (process == null) { return -1;
}
BufferedReader in = new BufferedReader(new InputStreamReader(
process.getInputStream()));
String line;
String freeSpace = null;
while ((line = in.readLine()) != null) {
freeSpace = line;
}
if (freeSpace == null) {
return -1;
}
process.destroy();
freeSpace = freeSpace.trim();
freeSpace = freeSpace.replaceAll("\\.", "");
freeSpace = freeSpace.replaceAll(",", "");
String[] items = freeSpace.split(" ");
int index = 1;
while (index < items.length) {
try {
long bytes = Long.parseLong(items[index++]);
return bytes;
} catch (NumberFormatException nfe) {
}
}
return -1; } catch (Exception ex) {
return -1; } } public static void main(String[] args) {
long l = 0;
if (args.length == 0) {
char[] c = { 'C', 'D', 'E', 'F' };
for (int i = 0; i < c.length; i++) {
String dirName = c[i] + ":\\"; System.out.println(dirName + " " + getFreeDiskSpace(dirName));
l += getFreeDiskSpace(dirName);
}
} else {
for (int i = 0; i < args.length; i++) {
System.out.println(args[i] + " " + getFreeDiskSpace(args[i]));
}
} }
}在网上搜了一个计算硬盘占用率的代码!
改了一下
但有点不对,希望高手改一改!
在此感谢!
/* Total number of processors or cores available to the JVM */
System.out.println("Available processors (cores): "
+ Runtime.getRuntime().availableProcessors());
/* Total amount of free memory available to the JVM */
System.out.println("Free memory (bytes): "
+ Runtime.getRuntime().freeMemory());
/* This will return Long.MAX_VALUE if there is no preset limit */
long maxMemory = Runtime.getRuntime().maxMemory();
/* Maximum amount of memory the JVM will attempt to use */
System.out.println("Maximum memory (bytes): "
+ (maxMemory == Long.MAX_VALUE ? "no limit" : maxMemory));
/* Total memory currently in use by the JVM */
System.out.println("Total memory (bytes): "
+ Runtime.getRuntime().totalMemory());
/* Get a list of all filesystem roots on this system */
File[] roots = File.listRoots();
/* For each filesystem root, print some info */ for (File root : roots) {
// System.out.println("File system root: " +
// root.getAbsolutePath()); System.out.println("Total space (bytes): " + root.getTotalSpace());
System.out.println("Free space (bytes): " + root.getFreeSpace());
System.out
.println("Usable space (bytes): " + root.getUsableSpace());
}