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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigDecimal;

import org.apache.log4j.Logger;

import sun.management.ManagementFactory;

import com.ailk.ts.message.bean.MonitorInfoBean;

public class SystemInfoTools {
	final static boolean isNotWindows = System.getProperties().getProperty("os.name").toLowerCase().indexOf("windows") < 0;
	final static BigDecimal DIVISOR = BigDecimal.valueOf(1024);
	private final static Logger logger = Logger.getLogger(SystemInfoTools.class);
	
	public static int getPid(){
		return Integer.parseInt(ManagementFactory.getRuntimeMXBean().getName().split("@")[0]);
	}
	
	public static MonitorInfoBean getMonitorInfoBean() {
		MonitorInfoBean monitorInfo = new MonitorInfoBean();
		if(!isNotWindows){
			monitorInfo.setMemUsage(500);
			return monitorInfo;
		}
		Runtime rt = Runtime.getRuntime();
		BufferedReader in = null;
		try {
			int pid = getPid();
			String[] cmd = {
					"/bin/sh",
					"-c",
					"top -b -n 1 | grep " + pid
					};
			Process p = rt.exec(cmd);
			in = new BufferedReader(new InputStreamReader(p.getInputStream()));
			String str = null;
			String[] strArray = null;
			while ((str = in.readLine()) != null) {
				logger.debug("top: " + str);
				int m = 0;
				strArray = str.split(" ");
				for (int i = 0; i < strArray.length; i++) {
					String info = strArray[i];
					if (info.trim().length() == 0){
						continue;
					}
					if(m == 5) {//第5列为进程占用的物理内存值
						String unit = info.substring(info.length() - 1);
						if(unit.equalsIgnoreCase("g")) {
							monitorInfo.setMemUseSize(Double.parseDouble(info));
						} else if(unit.equalsIgnoreCase("m")) {
							BigDecimal memUseSize = new BigDecimal(info.substring(0, info.length() - 1));
							monitorInfo.setMemUseSize(memUseSize.divide(DIVISOR, 2, BigDecimal.ROUND_HALF_UP).doubleValue());
						} else {
							BigDecimal memUseSize = new BigDecimal(info).divide(DIVISOR);
							monitorInfo.setMemUseSize(memUseSize.divide(DIVISOR, 2, BigDecimal.ROUND_HALF_UP).doubleValue());
						}
					}
					if(m == 8) {//第9列为CPU的使用百分比
						monitorInfo.setCpuUsage(Double.parseDouble(info));
					}
					if(m == 9) {//第10列为内存的使用百分比
						monitorInfo.setMemUsage(Double.parseDouble(info));
					}
					m++;
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				in.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	    
        return monitorInfo;
	}

}

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MonitorInfoBean.java

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public class MonitorInfoBean {

	/** cpu使用率 */
	private double cpuUsage;

	/** 内存使用率 */
	private double memUsage;

	/** 内存使用的大小 */
	private double memUseSize;

	public double getCpuUsage() {
		return cpuUsage;
	}

	public void setCpuUsage(double cpuUsage) {
		this.cpuUsage = cpuUsage;
	}

	public double getMemUsage() {
		return memUsage;
	}

	public void setMemUsage(double memUsage) {
		this.memUsage = memUsage;
	}

	public double getMemUseSize() {
		return memUseSize;
	}

	public void setMemUseSize(double memUseSize) {
		this.memUseSize = memUseSize;
	}

}