java Process

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import java.io.BufferedReader; import java.io.InputStreamReader;      public class CommandUtil {        public static String exeCmd(String commandStr){         String result="";          BufferedReader br = null;              try {                  Process p = Runtime.getRuntime().exec(commandStr);                  br = new BufferedReader(new InputStreamReader(p.getInputStream()));                  String line = null;                  StringBuilder sb = new StringBuilder();                  while ((line = br.readLine()) != null) {                      sb.append(line + "\n");                  }                                    result=sb.toString();             } catch (Exception e) {                  e.printStackTrace();              }               finally              {                  if (br != null)                  {                      try {                          br.close();                      } catch (Exception e) {                          e.printStackTrace();                      }                  }              }              return result;     }           public static void main(String[] args) {             String commandStr = "netstat -aon";            CommandUtil.exeCmd(commandStr);                }  }