java记录linux top命令信息

 import java.io.BufferedReader;

 import java.io.BufferedWriter;

 import java.io.File;

 import java.io.FileOutputStream;

 import java.io.IOException;

 import java.io.InputStreamReader;

 import java.io.OutputStreamWriter;

 import org.slf4j.Logger;

 import org.slf4j.LoggerFactory;

 /**

  * 记录当前内存信息

  *

  * @author Sx

  * @version 2013-10-08

  */

 public class TopFileUtils {

     private static final Logger logger = LoggerFactory.getLogger(TopFileUtils.class);

     public static String writeTopMsg() {

         InputStreamReader isr = null;

         BufferedReader br = null;

         FileOutputStream fos = null;

         OutputStreamWriter osw = null;

         BufferedWriter bw = null;

         String result = "";

         try {

             String cmd = "top -b -n 1";// 直接写top输出为空，动态命令，只能加参数输出一次

             Process ps = Runtime.getRuntime().exec(cmd);

             isr = new InputStreamReader(ps.getInputStream());

             br = new BufferedReader(isr);

             File file = new File("/opt/topmsg.txt");

             if (!file.exists()) {

                 file.createNewFile();

             }

             fos = new FileOutputStream(file, true);

             osw = new OutputStreamWriter(fos);

             bw = new BufferedWriter(osw);

             StringBuffer sb = new StringBuffer();

             String line = null;

             while ((line = br.readLine()) != null) {

                 sb.append(line).append("\n");

                 bw.write(line + "\n");

             }

             result = sb.toString();

         } catch (Exception e) {

             logger.error("writeTopMsg error:" + e);

         } finally {

             try {

                 if (bw != null)

                     bw.close();

             } catch (IOException e) {

                 logger.error("close bw error:" + e);

             }

             try {

                 if (osw != null)

                     osw.close();

             } catch (IOException e) {

                 logger.error("close osw error:" + e);

             }

             try {

                 if (fos != null)

                     fos.close();

             } catch (IOException e) {

                 logger.error("close fos error:" + e);

             }

             try {

                 if (br != null)

                     br.close();

             } catch (IOException e) {

                 logger.error("close br error:" + e);

             }

             try {

                 if (isr != null)

                     isr.close();

             } catch (IOException e) {

                 logger.error("close isr error:" + e);

             }

         }

         return result;

     }

     public static void main(String[] args) {

         System.out.println(writeTopMsg());

     }

 }