用java獲得當前性能信息,java獲取cpu使用情況

本文目錄一覽：

• 1、使用java如何獲取遠程主機(引擎)的cpu性能，佔用內存，硬碟等信息（需要返回數據到前台頁面）
• 2、在Java中如何獲得當前系統的進程信息
• 3、如何用javavisualvm 來進行性能分析
• 4、java中如何獲得計算機的信息。
• 5、請問Java如何動態顯示當前內存佔用率餅圖
• 6、如何獲取java程序當前的使用內存

使用java如何獲取遠程主機(引擎)的cpu性能，佔用內存，硬碟等信息（需要返回數據到前台頁面）

我也這在做這方面的信息，我要寫一個java客戶端，發送命令調用遠程snmp，獲得一些相關信息

在Java中如何獲得當前系統的進程信息

1、在Windows的命令行 tasklist 可以獲得進程列表

你先CMD, 再執行tasklist 可以看到類似任務管理器里的進程信息

2、JAVA要調用CMD命令, 用 Process process = Runtime.getRuntime().exec(command);

例如：查找某進程

Process proc = Runtime.getRuntime().exec(“tasklist /FI \”IMAGENAME eq ” + processName + “\””);

bufferedReader = new BufferedReader(new InputStreamReader(proc.getInputStream()));

String line = null;

while ((line = bufferedReader.readLine()) != null) {

if (line.contains(“QQ.exe”)) {

System.out.printlns(“找到了”);

}

}

如何用javavisualvm 來進行性能分析

啟動jvisualvm

首先到JDK安裝目錄/bin目錄下，雙擊jvisualvm.exe文件啟動

進入jvisualvm界面，右側為正在運行的Java程序，打開了一個jconsole程序來做示例

雙擊要監控的Java進行，有關監控進程的概要，監控，線程等信息都會以圖像的方式顯現出來，能更方便的對Java運行程序做分析

右鍵左邊欄，正在運行的Java程序，可以執行Dump,線程，Dump堆的操作並且可以將正在運行的程序進行快照儲備，同時可以設置在發生內存溢出時自動生成Dump文件。

右鍵【文件】–【添加遠程主機】可對遠程運行的Java程序進行監控

菜單欄，工具–插件 輔助功能 可以幫助我們更細緻對Java程序進行監視分析，比如Visual GC 能顯示年輕代里的Eden區和survivor區的實時數據

Visualvm是一個非常實用的Java 監控工具，操作十分方便，多用幾次就會很快的入手啦。

java中如何獲得計算機的信息。

System.getProperties()

返回的是Properties

Properties 類表示了一個持久的屬性集

以下的代碼就可以把Properties的內容讀出來

Properties props = new Properties();

try {

InputStream in = new BufferedInputStream (new FileInputStream(filePath));

props.load(in);

Enumeration en = props.propertyNames();

while (en.hasMoreElements()) {

String key = (String) en.nextElement();

String Property = props.getProperty (key);

System.out.println(key+Property);

}

} catch (Exception e) {

e.printStackTrace();

}

對於補充的回答：

java不能直接得到樓主需要的信息，但是可以採用JNI,即調用C程序，讓C得到這些信息

請問Java如何動態顯示當前內存佔用率餅圖

這個東西不好找，想要你的分，找了一下午呢，下面的程序能讀到內存使用情況，把讀到的數據放在棧里，GUI的圖餅類每隔0.5秒取棧里拿一次數據，然後刷新圖餅就行了

JXM：Monitoring and Management Interface for the Java™ Platform

通過jmx可以監控vm內存使用,系統內存使用等

以下是網上某博客代碼，特點是通過window和linux命令獲得CPU使用率。

Java代碼

利用java程序實現獲取計算機cpu利用率和內存使用信息。

創建一個Bean用來存貯要得到的信

public class MonitorInfoBean {

/** 可使用內存. */

private long totalMemory;

/** 剩餘內存. */

private long freeMemory;

/** 最大可使用內存. */

private long maxMemory;

/** 操作系統. */

private String osName;

/** 總的物理內存. */

private long totalMemorySize;

/** 剩餘的物理內存. */

private long freePhysicalMemorySize;

/** 已使用的物理內存. */

private long usedMemory;

/** 線程總數. */

private int totalThread;

/** cpu使用率. */

private double cpuRatio;

public long getFreeMemory() {

return freeMemory;

}

public void setFreeMemory(long freeMemory) {

this.freeMemory = freeMemory;

}

public long getFreePhysicalMemorySize() {

return freePhysicalMemorySize;

}

public void setFreePhysicalMemorySize(long freePhysicalMemorySize) {

this.freePhysicalMemorySize = freePhysicalMemorySize;

}

public long getMaxMemory() {

return maxMemory;

}

public void setMaxMemory(long maxMemory) {

this.maxMemory = maxMemory;

}

public String getOsName() {

return osName;

}

public void setOsName(String osName) {

this.osName = osName;

}

public long getTotalMemory() {

return totalMemory;

}

public void setTotalMemory(long totalMemory) {

this.totalMemory = totalMemory;

}

public long getTotalMemorySize() {

return totalMemorySize;

}

public void setTotalMemorySize(long totalMemorySize) {

this.totalMemorySize = totalMemorySize;

}

public int getTotalThread() {

return totalThread;

}

public void setTotalThread(int totalThread) {

this.totalThread = totalThread;

}

public long getUsedMemory() {

return usedMemory;

}

public void setUsedMemory(long usedMemory) {

this.usedMemory = usedMemory;

}

public double getCpuRatio() {

return cpuRatio;

}

public void setCpuRatio(double cpuRatio) {

this.cpuRatio = cpuRatio;

}

}

之後，建立bean的介面

public interface IMonitorService {

public MonitorInfoBean getMonitorInfoBean() throws Exception;

}

然後，就是最關鍵的，得到cpu的利用率，已用內存，可用內存，最大內存等信息。

import java.io.InputStreamReader;

import java.io.LineNumberReader;

import sun.management.ManagementFactory;

import com.sun.management.OperatingSystemMXBean;

import java.io.*;

import java.util.StringTokenizer;

/**

* 獲取系統信息的業務邏輯實現類.

* @author GuoHuang

*/

public class MonitorServiceImpl implements IMonitorService {

private static final int CPUTIME = 30;

private static final int PERCENT = 100;

private static final int FAULTLENGTH = 10;

private static final File versionFile = new File(“/proc/version”);

private static String linuxVersion = null;

/**

* 獲得當前的監控對象.

* @return 返回構造好的監控對象

* @throws Exception

* @author GuoHuang

*/

public MonitorInfoBean getMonitorInfoBean() throws Exception {

int kb = 1024;

// 可使用內存

long totalMemory = Runtime.getRuntime().totalMemory() / kb;

// 剩餘內存

long freeMemory = Runtime.getRuntime().freeMemory() / kb;

// 最大可使用內存

long maxMemory = Runtime.getRuntime().maxMemory() / kb;

OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory

.getOperatingSystemMXBean();

// 操作系統

String osName = System.getProperty(“os.name”);

// 總的物理內存

long totalMemorySize = osmxb.getTotalPhysicalMemorySize() / kb;

// 剩餘的物理內存

long freePhysicalMemorySize = osmxb.getFreePhysicalMemorySize() / kb;

// 已使用的物理內存

long usedMemory = (osmxb.getTotalPhysicalMemorySize() – osmxb

.getFreePhysicalMemorySize())

/ kb;

// 獲得線程總數

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();

}

// 構造返回對象

MonitorInfoBean infoBean = new MonitorInfoBean();

infoBean.setFreeMemory(freeMemory);

infoBean.setFreePhysicalMemorySize(freePhysicalMemorySize);

infoBean.setMaxMemory(maxMemory);

infoBean.setOsName(osName);

infoBean.setTotalMemory(totalMemory);

infoBean.setTotalMemorySize(totalMemorySize);

infoBean.setTotalThread(totalThread);

infoBean.setUsedMemory(usedMemory);

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());

}

}

/**

* 獲得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”;

// 取進程信息

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;

}

}

/**

* 讀取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;

}

// 欄位出現順序：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;

}

/** 測試方法.

* @param args

* @throws Exception

* @author GuoHuang

*/

public static void main(String[] args) throws Exception {

IMonitorService service = new MonitorServiceImpl();

MonitorInfoBean monitorInfo = service.getMonitorInfoBean();

System.out.println(“cpu佔有率=” + monitorInfo.getCpuRatio());

System.out.println(“可使用內存=” + monitorInfo.getTotalMemory());

System.out.println(“剩餘內存=” + monitorInfo.getFreeMemory());

System.out.println(“最大可使用內存=” + monitorInfo.getMaxMemory());

System.out.println(“操作系統=” + monitorInfo.getOsName());

System.out.println(“總的物理內存=” + monitorInfo.getTotalMemorySize() + “kb”);

System.out.println(“剩餘的物理內存=” + monitorInfo.getFreeMemory() + “kb”);

System.out.println(“已使用的物理內存=” + monitorInfo.getUsedMemory() + “kb”);

System.out.println(“線程總數=” + monitorInfo.getTotalThread() + “kb”);

}

}

其中，Bytes類用來處理字元串

public class Bytes {

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;

}

}

如何獲取java程序當前的使用內存

方法如下：

首先

創建一個Bean用來存貯要得到的信

public class MonitorInfoBean {

/** 可使用內存. */

private long totalMemory;

/** 剩餘內存. */

private long freeMemory;

/** 最大可使用內存. */

private long maxMemory;

/** 操作系統. */

private String osName;

/** 總的物理內存. */

private long totalMemorySize;

/** 剩餘的物理內存. */

private long freePhysicalMemorySize;

/** 已使用的物理內存. */

private long usedMemory;

/** 線程總數. */

private int totalThread;

/** cpu使用率. */

private double cpuRatio;

public long getFreeMemory() {

return freeMemory;

}

public void setFreeMemory(long freeMemory) {

this.freeMemory = freeMemory;

}

public long getFreePhysicalMemorySize() {

return freePhysicalMemorySize;

}

public void setFreePhysicalMemorySize(long freePhysicalMemorySize) {

this.freePhysicalMemorySize = freePhysicalMemorySize;

}

public long getMaxMemory() {

return maxMemory;

}

public void setMaxMemory(long maxMemory) {

this.maxMemory = maxMemory;

}

public String getOsName() {

return osName;

}

public void setOsName(String osName) {

this.osName = osName;

}

public long getTotalMemory() {

return totalMemory;

}

public void setTotalMemory(long totalMemory) {

this.totalMemory = totalMemory;

}

public long getTotalMemorySize() {

return totalMemorySize;

}

public void setTotalMemorySize(long totalMemorySize) {

this.totalMemorySize = totalMemorySize;

}

public int getTotalThread() {

return totalThread;

}

public void setTotalThread(int totalThread) {

this.totalThread = totalThread;

}

public long getUsedMemory() {

return usedMemory;

}

public void setUsedMemory(long usedMemory) {

this.usedMemory = usedMemory;

}

public double getCpuRatio() {

return cpuRatio;

}

public void setCpuRatio(double cpuRatio) {

this.cpuRatio = cpuRatio;

}

}

之後，建立bean的介面

public interface IMonitorService {

public MonitorInfoBean getMonitorInfoBean() throws Exception;

}

然後，就是最關鍵的，得到cpu的利用率，已用內存，可用內存，最大內存等信息。

import java.io.InputStreamReader;

import java.io.LineNumberReader;

import sun.management.ManagementFactory;

import com.sun.management.OperatingSystemMXBean;

import java.io.*;

import java.util.StringTokenizer;

/**

* 獲取系統信息的業務邏輯實現類.

* @author GuoHuang

*/

public class MonitorServiceImpl implements IMonitorService {

private static final int CPUTIME = 30;

private static final int PERCENT = 100;

private static final int FAULTLENGTH = 10;

private static final File versionFile = new File(“/proc/version”);

private static String linuxVersion = null;

/**

* 獲得當前的監控對象.

* @return 返回構造好的監控對象

* @throws Exception

* @author GuoHuang

*/

public MonitorInfoBean getMonitorInfoBean() throws Exception {

int kb = 1024;

// 可使用內存

long totalMemory = Runtime.getRuntime().totalMemory() / kb;

// 剩餘內存

long freeMemory = Runtime.getRuntime().freeMemory() / kb;

// 最大可使用內存

long maxMemory = Runtime.getRuntime().maxMemory() / kb;

OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory

.getOperatingSystemMXBean();

// 操作系統

String osName = System.getProperty(“os.name”);

// 總的物理內存

long totalMemorySize = osmxb.getTotalPhysicalMemorySize() / kb;

// 剩餘的物理內存

long freePhysicalMemorySize = osmxb.getFreePhysicalMemorySize() / kb;

// 已使用的物理內存

long usedMemory = (osmxb.getTotalPhysicalMemorySize() – osmxb

.getFreePhysicalMemorySize())

/ kb;

// 獲得線程總數

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();

}

// 構造返回對象

MonitorInfoBean infoBean = new MonitorInfoBean();

infoBean.setFreeMemory(freeMemory);

infoBean.setFreePhysicalMemorySize(freePhysicalMemorySize);

infoBean.setMaxMemory(maxMemory);

infoBean.setOsName(osName);

infoBean.setTotalMemory(totalMemory);

infoBean.setTotalMemorySize(totalMemorySize);

infoBean.setTotalThread(totalThread);

infoBean.setUsedMemory(usedMemory);

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);

}

}