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
*?
* <p>@author javer QQ:84831612</p>
* @date 2005
*/
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());
??????}
???
??????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());
???
??????Thread.sleep(1000);

??????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());

??????return (float)((user2 + sys2 + nice2) - (user1 + sys1 + nice1)) / (float)((user2 + nice2 + sys2 + idle2) - (user1 + nice1 + sys1 + idle1));
???}
}

/**
* 测试类
*?
* <p>@author javer QQ:84831612</p>
* @date 2005
*/
public class JaverTest
{
????public static void main(String[] args) throws Exception
????{
????????int[] memInfo = LinuxSystemTool.getMemInfo();
????????System.out.println("MemTotal：" + memInfo[0]);
????????System.out.println("MemFree：" + memInfo[1]);
????????System.out.println("SwapTotal：" + memInfo[2]);
????????System.out.println("SwapFree：" + memInfo[3]);

????????System.out.println("CPU利用率：" + LinuxSystemTool.getCpuInfo());
????}
}