[jboss-user] [Tomcat, HTTPD, Servlets & JSP] - Re: how to call unix shell script from web app?

[ragavgomatam]

Code is as below :- 



import java.io.*;
  | 
  | /** Demonstrate how to run an external program. **/
  | public class MyServlet implements HttpServlet{
  | 
  |   /** From the main run an servlet . **/
  |   public doGet( request,response) {
  |     try {
  |       Runtime rt = Runtime.getRuntime ();       // step 1
  | 
  |       Process process = rt.exec ("/call/some/shell"); // step 2
  | 
  |       InputStreamReader reader =                // step 3
  |         new InputStreamReader ( process.getInputStream () );
  | 
  |       BufferedReader buf_reader =
  |          new BufferedReader (  reader );        // step 4.
  | 
  |       String line;
  |       while ((line = buf_reader.readLine ()) != null)
  |                    System.out.println (line);
  | 
  |     } 
  |     catch (IOException e) {
  |       System.out.println (e);
  |     }
  |   }   
  | } // servlet end 

Make sure you grab the Process & flush the err stream, input tsream & out put stream...Other wise due to insufficient length of err buffers in OS this would hang 

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