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());
     }
 }