Java获取Linux下的系统信息

import java.io.*;

/**
 * linux 下cpu 内存 磁盘 jvm的使用监控
 * @author avery_leo
 *
 */
public class TT {
	/**
	 * 获取cpu使用情况
	 * @return
	 * @throws Exception
	 */
	public double getCpuUsage() throws Exception {
		double cpuUsed = 0;

		Runtime rt = Runtime.getRuntime();
		Process p = rt.exec("top -b -n 1");// 调用系统的“top"命令
	

		BufferedReader in = null;
		try {
			in = new BufferedReader(new InputStreamReader(p.getInputStream()));
			String str = null;
			String[] strArray = null;
		
			while ((str = in.readLine()) != null) {
				int m = 0;
				
				if (str.indexOf(" R ") != -1) {// 只分析正在运行的进程，top进程本身除外 &&
					
				strArray = str.split(" ");
					for (String tmp : strArray) {
						if (tmp.trim().length() == 0)
							continue;
						if (++m == 9) {// 第9列为CPU的使用百分比(RedHat
							
							cpuUsed += Double.parseDouble(tmp);

						}

					}

				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			in.close();
		}
		return cpuUsed;
	}
/**
 * 内存监控
 * @return
 * @throws Exception
 */
	public double getMemUsage() throws Exception {

		double menUsed = 0;
		Runtime rt = Runtime.getRuntime();
		Process p = rt.exec("top -b -n 1");// 调用系统的“top"命令
	

		BufferedReader in = null;
		try {
			in = new BufferedReader(new InputStreamReader(p.getInputStream()));
			String str = null;
			String[] strArray = null;
		
			while ((str = in.readLine()) != null) {
				int m = 0;
				
				if (str.indexOf(" R ") != -1) {// 只分析正在运行的进程，top进程本身除外 &&
					// 
					// System.out.println("------------------3-----------------");
					strArray = str.split(" ");
					for (String tmp : strArray) {
						if (tmp.trim().length() == 0)
							continue;

						if (++m == 10) {
							// 9)--第10列为mem的使用百分比(RedHat 9)

							menUsed += Double.parseDouble(tmp);

						}
					}

				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			in.close();
		}
		return menUsed;
	}

	/**
	 * 获取磁盘空间大小
	 * 
	 * @return
	 * @throws Exception
	 */
	public double getDeskUsage() throws Exception {
		double totalHD = 0;
		double usedHD = 0;
		Runtime rt = Runtime.getRuntime();
		Process p = rt.exec("df -hl");//df -hl 查看硬盘空间
	

		BufferedReader in = null;
		try {
			in = new BufferedReader(new InputStreamReader(p.getInputStream()));
			String str = null;
			String[] strArray = null;
			int flag = 0;
			while ((str = in.readLine()) != null) {
				int m = 0;
//				if (flag > 0) {
//					flag++;
					strArray = str.split(" ");
					for (String tmp : strArray) {
						if (tmp.trim().length() == 0)
							continue;
						++m;
//						System.out.println("----tmp----" + tmp);
						if (tmp.indexOf("G") != -1) {
							if (m == 2) {
//								System.out.println("---G----" + tmp);
								if (!tmp.equals("") && !tmp.equals("0"))
									totalHD += Double.parseDouble(tmp
											.substring(0, tmp.length() - 1)) * 1024;

							}
							if (m == 3) {
//								System.out.println("---G----" + tmp);
								if (!tmp.equals("none") && !tmp.equals("0"))
									usedHD += Double.parseDouble(tmp.substring(
											0, tmp.length() - 1)) * 1024;

							}
						}
						if (tmp.indexOf("M") != -1) {
							if (m == 2) {
//								System.out.println("---M---" + tmp);
								if (!tmp.equals("") && !tmp.equals("0"))
									totalHD += Double.parseDouble(tmp
											.substring(0, tmp.length() - 1));

							}
							if (m == 3) {
//								System.out.println("---M---" + tmp);
								if (!tmp.equals("none") && !tmp.equals("0"))
									usedHD += Double.parseDouble(tmp.substring(
											0, tmp.length() - 1));
								// System.out.println("----3----" + usedHD);
							}
						}
						
					}

//				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			in.close();
		}
		return (usedHD / totalHD) * 100;
	}

	public static void main(String[] args) throws Exception {
		TT cpu = new TT();
		System.out.println("---------------cpu used:" + cpu.getCpuUsage() + "%");
		System.out.println("---------------mem used:" + cpu.getMemUsage() + "%");
		System.out.println("---------------HD used:" + cpu.getDeskUsage() + "%");
		System.out.println("------------jvm监控----------------------");
		Runtime lRuntime = Runtime.getRuntime();
		System.out.println("--------------Free Momery:" + lRuntime.freeMemory()+"K");
		System.out.println("--------------Max Momery:" + lRuntime.maxMemory()+"K");
		System.out.println("--------------Total Momery:" + lRuntime.totalMemory()+"K");
		System.out.println("---------------Available Processors :"
				+ lRuntime.availableProcessors());
	}
}