用Java获得当前性能信息

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，本例讲解如何取得这些信息，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.amigo.performance;

/**
* 监视信息的JavaBean类.
* @author <a href="mailto:xiexingxing1121@126.com">AmigoXie</a>
* @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;

    /** 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.amigo.performance;

/**
* 获取系统信息的业务逻辑类接口.
* @author <a href="mailto:xiexingxing1121@126.com">AmigoXie</a>
* @version 1.0
* Creation date: 2008-3-11 - 上午10:06:06
*/
public inte易做图ce IMonitorService {
    /**
     * 获得当前的监控对象.
     * @return 返回构造好的监控对象
     * @throws Exception
     * @author <a href="mailto:xiexingxing1121@126.com">AmigoXie</a>
     * Creation date: 2008-4-25 - 上午10:45:08
     */
    public MonitorInfoBean getMonitorInfoBean() throws Exception;

}
     该类的实现类MonitorServiceImpl如下所示：
package com.amigo.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 <a href="mailto:xiexingxing1121@126.com">AmigoXie</a>
* @version 1.0 Creation date: 2008-3-11 - 上午10:06:06
*/
public class MonitorServiceImpl implements IMonitorService {

    private static final int CPUTIME = 30;

    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 <a href="mailto:x

补充：软件开发 , Java ,