linuxsystemtool.java

Unix服务器监控的实例脚本

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

/**
 * 
 * 
 * 取得linux系统下的cpu、内存信息
 * 
 */
public final class LinuxSystemTool {
	/**
	 * get memory by used info
	 * 
	 * @return int[] result
	 *         result.length==4;int[0]=MemTotal;int[1]=MemFree;int[2]=SwapTotal;int[3]=SwapFree;
	 * @throws IOException
	 * @throws InterruptedException
	 */
	public static int[] getMemInfo() throws IOException, InterruptedException {
		File file = new File("/proc/meminfo");
		BufferedReader br = new BufferedReader(new InputStreamReader(
				new FileInputStream(file)));
		int[] result = new int[4];
		String str = null;
		StringTokenizer token = null;
		while ((str = br.readLine()) != null) {
			token = new StringTokenizer(str);
			if (!token.hasMoreTokens())
				continue;

			str = token.nextToken();
			if (!token.hasMoreTokens())
				continue;

			if (str.equalsIgnoreCase("MemTotal:"))
				result[0] = Integer.parseInt(token.nextToken());
			else if (str.equalsIgnoreCase("MemFree:"))
				result[1] = Integer.parseInt(token.nextToken());
			else if (str.equalsIgnoreCase("SwapTotal:"))
				result[2] = Integer.parseInt(token.nextToken());
			else if (str.equalsIgnoreCase("SwapFree:"))
				result[3] = Integer.parseInt(token.nextToken());
				System.out.println("MemTotal==" +result[0]+"==MemFree==" +result[1]+"==SwapTotal==" +result[2]+"==SwapFree==" +result[3]);

		} 
		br.close();
		return result;
	}

	/**
	 * get memory by used info
	 * 
	 * @return float efficiency
	 * @throws IOException
	 * @throws InterruptedException
	 */
	public static float getCpuInfo() throws IOException, InterruptedException {
		File file = new File("/proc/stat");
		BufferedReader br = new BufferedReader(new InputStreamReader(
				new FileInputStream(file)));
		StringTokenizer token = new StringTokenizer(br.readLine());
		token.nextToken();
		int user1 = Integer.parseInt(token.nextToken());
		int nice1 = Integer.parseInt(token.nextToken());
		int sys1 = Integer.parseInt(token.nextToken());
		int idle1 = Integer.parseInt(token.nextToken());

    System.out.println(user1 +  "  " + nice1 + "  " + sys1 + "  "+ idle1);
		Thread.sleep(1500);

		br = new BufferedReader(
				new InputStreamReader(new FileInputStream(file)));
		token = new StringTokenizer(br.readLine());
		token.nextToken();
		int user2 = Integer.parseInt(token.nextToken());
		int nice2 = Integer.parseInt(token.nextToken());
		int sys2 = Integer.parseInt(token.nextToken());
		int idle2 = Integer.parseInt(token.nextToken());
		
        System.out.println(user2 +  "  " + nice2 + "  " + sys2 + "  "+ idle2);
        br.close();
		return (float) ((user2 + sys2 + nice2) - (user1 + sys1 + nice1))
				/ (float) ((user2 + nice2 + sys2 + idle2) - (user1 + nice1
						+ sys1 + idle1));
	
	}
	public static void main(String [] argc){
		try{
		int [] aa = LinuxSystemTool.getMemInfo();
		
		//float bb = LinuxSystemTool.getCpuInfo();
		System.out.println("aa[0]==" +aa[0]+"==aa[1]==" +aa[1]+"==aa[2]==" +aa[2]+"==aa[3]==" +aa[3]);
		System.out.println("bb="+bb);
	 }catch(Exception e){}
	}
}