使用Java代码获取服务器性能信息及局域网内主机名

使用Java代码获取服务器性能信息及局域网内主机名

最近做个项目，就是要取得cpu占有率等等的系统信息，一开始以为要用动态链接库了，但后来发现可以像下面这样做，不去调用jni，这样省去了很多看新技术的时间o(∩_∩)o...

在java中，可以获得总的物理内存、剩余的物理内存、已使用的物理内存等信息，下面例子可以取得这些信息，并且获得在Windows下的内存使用率。

     首先编写一个MonitorInfoBean类，用来装载监控的一些信息，包括物理内存、剩余的物理内存、已使用的物理内存、内存使用率等字段，该类的代码如下：

package com.amgkaka.performance;

/** */ /**

* 监视信息的JavaBean类.

* @author amg

* @version 1.0

* Creation date: 2008-4-25 - 上午10:37:00

*/

public class MonitorInfoBean {

/** */ /** 可使用内存. */

private long totalMemory;

/** */ /** 剩余内存. */

private long freeMemory;

/** */ /** 最大可使用内存. */

private long maxMemory;

/** */ /** 操作系统. */

private String osName;

/** */http:// /** 总的物理内存. */

private long totalMemorySize;

/** */ /** 剩余的物理内存. */

private long freePhysicalMemorySize;

/** */ /** 已使用的物理内存. */

private long usedMemory;

/** */ /** 线程总数. */

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;

}

}

接着编写一个获得当前的监控信息的接口，该类的代码如下所示：

package com.amgkaka.performance;

/** */ /**

* 获取系统信息的业务逻辑类接口.

* @author amg * @version 1.0

* Creation date: 2008-3-11 - 上午10:06:06

*/

public interface IMonitorService {

/** */ /**

* 获得当前的监控对象.

* @return 返回构造好的监控对象

* @throws Exception

* @author amgkaka

* Creation date: 2008-4-25 - 上午10:45:08

*/

public MonitorInfoBean ghttp://etMonitorInfoBean() throws Exception;

}

该类的实现类MonitorServiceImpl如下所示：

package com.amgkaka.performance;

import java.io.InputStreamReader;

import java.io.LineNumberReader;

import sun.management.ManagementFactory;

import com.sun.management.OperatingSystemMXBean;

/** */ /**

* 获取系统信息的业务逻辑实现类.

* @author amg * @version 1.0 Creation date: 2008-3-11 - 上午10:06:06

*/

public class MonitorServiceImpl implements IMonitorService {

//可以设置长些，防止读到运行此次系统检查时的cpu占用率，就不准了

private static final int CPUTIME = 5000 ;

private static final int PERCENT = 100 ;

private static final int FAULTLENGTH = 10 ;

/** */ /**

* 获得当前的监控对象.

* @return 返回构造好的监控对象

* @throws Exception

* @author amg * Creation date: 2008-4-25 - 上午10:45:08

*/

public MonitorInfoBean getMonitorInfoBean() throws Exception {

int kb = 1024 ;

// 可使用内存

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

// 剩余内存

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

// 最大可使用内存

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

OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory

.getOperatingSystemMXBean();

// 操作系统

String osName = System.getProperty("os.name" );

// 总的物理内存

long totalMemorySize = osmxb.getTotalPhysicalMemorySize() / kb;

// 剩余的物理内存

long freePhysicalMemorySize = osmxb.getFreePhysicalMemorySize() / kb;

// 已使用的物理内存

long usedMemory = (osmxb.getTotalPhysicalMemorySize() - osmxb

.getFreePhysicalMemorySize())

/ kb;

// 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();

}

// 构造返回对象

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;

}

/** */ /**

* 获得CPU使用率.

* @return 返回cpu使用率

* @author amg * Creation date: 2008-4-25 - 下午06:05:11

*/

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 amg * Creation date: 2008-4-25 - 下午06:10:14

*/

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 ;

}

/** */ /**

* 测试方法.

* @param args

* @throws Exception

* @author amg * Creation date: 2008-4-30 - 下午04:47:29

*/

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

IMonitorService service = new MonitorServiceImpl();

MonitorInfoBean monitorInfo = service.getMonitorInfoBean();

System.out.println("cpu占有率=" + monitorInfo.getCpuRatio());

System.out.println("可使用内存=" + monitorInfo.getTotalMemory());

System.out.println("剩余内存=" + monitorInfo.getFreeMemory());

System.out.println("最大可使用内存=" + monitorInfo.getMaxMemory());

System.out.println("操作系统=" + monitorInfo.getOsName());

System.out.println("总的物理内存=" + monitorInfo.getTotalMemorySize() + "kb" );

System.out.println("剩余的物理内存=" + monitorInfo.getFreeMemory() + "kb" );

System.out.println("已使用的物理内存=" + monitorInfo.getUsedMemory() + "kb" );

System.out.println("线程总数=" + monitorInhttp://fo.getTotalThread() + "kb" );

}

}

该实现类中需要用到一个自己编写byte的工具类，该类的代码如下所示：

package com.amTkDhUXgkaka.performance;

/** */ /**

* byte操作类.

* @author amg * @version 1.0

* Creation date: 2008-4-30 - 下午04:57:23

*/

public class Bytes {

/** */ /**

* 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

*/

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;

}

}

运行下MonitorBeanImpl类，读者将会看到当前的内存、cpu利用率等信息。

PS：得到局域网内所有主机名的方法

import java.net.InetAddress;

import java.net.UnknownHostException;

public class A {

static public void main(String[] args) {

try {

//通过主机名称得到IP地址

InetAddress address = InetAddress.getByName("192.168.9.148");

System.out.println("192.168.9.148"+": "+address.getHostAddress());

// 通过IP得到主机名称

String ips="192.168.9.",ip;

InetAddress addip;

for(int i=148;i<255;i++){

ip=ips+i;

addip=InetAddress.getByName(ip);

System.out.println(ip+": "+addip.getHostName());

}

}

catch(UnknownHostException uhe) {

System.err.println("Unable to find: "+"192.168.9.148");

}

}

}

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