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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 performance;

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;
    
/** 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 performance;

/**
 * 获取系统信息的业务逻辑类接口.
 
*/
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
     
*/
    
public MonitorInfoBean getMonitorInfoBean() throws Exception;
}
该类的实现类MonitorServiceImpl如下所示:
package performance;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.util.StringTokenizer;
import sun.management.ManagementFactory;
import com.sun.management.OperatingSystemMXBean;

/**
 * 
 * 获取系统信息的业务逻辑实现类.
 * 
 * 
@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 String linuxVersion = null;

    
/**
     * 获得当前的监控对象.
     * 
     * 
@return 返回构造好的监控对象
     * 
@throws Exception
     * 
@author GuoHuang
     
*/
    
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();
        } 
else {
            cpuRatio 
= getCpuRateForLinux();
        }
        
// 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;
    }

    
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;
                }
                String s1 
= Bytes.substring(line, kmtidx, rocidx - 1).trim();
                String s2 
= Bytes.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;
    }

    
/**
     * 测试方法.
     * 
     * 
@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=" + monitorInfo.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 performance;

/**
 * byte操作类.
 
*/
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。
在hardware.jsp中以文字加图像形式显示CPU使用率、系统内存(每隔5秒刷新一次),代码如下所示:
<%@ page language="java" import="performance.*" pageEncoding="utf-8"%>

<%
    
String path = request.getContextPath();
    
String basePath = request.getScheme() + "://"
            
+ request.getServerName() + ":" + request.getServerPort()
            
+ path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
    
<head>
        
<base href="<%=basePath%>">

        
<title>运行状态</title>

        
<meta http-equiv="pragma" content="no-cache">
        
<meta http-equiv="cache-control" content="no-cache">
        
<meta http-equiv="expires" content="0">
        
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
        
<meta http-equiv="description" content="This is my page">
        
<meta http-equiv="refresh" content="5">

    
</head>

    
<body>
        
<%
            IMonitorService service 
= new MonitorServiceImpl();
            MonitorInfoBean monitorInfo 
= service.getMonitorInfoBean();
            out.println(
"cpu占有率=" + monitorInfo.getCpuRatio() + "<br>");
            out.println(
"可使用内存=" + monitorInfo.getTotalMemory() + "<br>");
            out.println(
"剩余内存=" + monitorInfo.getFreeMemory() + "<br>");
            out.println(
"最大可使用内存=" + monitorInfo.getMaxMemory() + "<br>");
            out.println(
"操作系统=" + monitorInfo.getOsName() + "<br>");
            out.println(
"总的物理内存=" + monitorInfo.getTotalMemorySize() + "kb"
                    
+ "<br>");
            out.println(
"剩余的物理内存=" + monitorInfo.getFreeMemory() + "kb"
                    
+ "<br>");
            out.println(
"已使用的物理内存=" + monitorInfo.getUsedMemory() + "kb"
                    
+ "<br>");
            out.println(
"线程总数=" + monitorInfo.getTotalThread() + "kb" + "<br>");
        
%>

        cpu:
        
<table width="150" style="border: 1px solid #00FF00;">
            
<tr>
                
<td>
                    
<table width="150" bgcolor="#FFFFFF" cellpadding="0"
                        cellspacing
="0">
                        
<tr>
                            
<td width="<%=monitorInfo.getCpuRatio()%>%" bgcolor="#00FF00"
                                align
="center">
                                
<%=(int) (monitorInfo.getCpuRatio())%>%
                            
</td>
                            
<td bgcolor="#FFFFFF">
                                
&nbsp;
                            
</td>
                        
</tr>
                    
</table>
                
</td>
            
</tr>
        
</table>

        
<table width="1000" style="height: 0.5px;">
            
<tr>
                
<td></td>
            
</tr>
        
</table>
        内存:
<%
            
int memory = (int) (monitorInfo.getUsedMemory() * 100 / monitorInfo
                    .getTotalMemorySize());
        
%>
        
<table width="150" style="border: 1px solid #00FF00;">
            
<tr>
                
<td>
                    
<table width="150" bgcolor="#FFFFFF" cellpadding="0"
                        cellspacing
="0">
                        
<tr>
                            
<td width="<%=memory%>%" bgcolor="#00FF00" align="center">
                                
<%=memory%>%
                            
</td>
                            
<td bgcolor="#FFFFFF">
                                
&nbsp;
                            
</td>
                        
</tr>
                    
</table>
                
</td>
            
</tr>
        
</table>
    
</body>
</html>
最终效果如图所示:
posted on 2012-08-24 16:48 飞翔天使 阅读(4839) 评论(2)  编辑  收藏 所属分类: JSP

FeedBack:
# re: JSP获取CPU使用率、系统内存、虚拟机内存等情况(不用JNI) 2012-08-24 23:00 Swift Java Tools
原来是JMX,这代码够复杂的,就取这么点数据。  回复  更多评论
  
# re: JSP获取CPU使用率、系统内存、虚拟机内存等情况(不用JNI) 2012-08-29 22:21 stevenfrog
还行,支持一下  回复  更多评论
  

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