📄 redirectservlet.java

📁 java web services how to program

💻 JAVA

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// Fig. A.16: RedirectServlet.java
// Redirecting a user to a different Web page.
package com.deitel.jws.servlets;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;

public class RedirectServlet extends HttpServlet {   

   // process "get" request from client
   protected void doGet( HttpServletRequest request, 
      HttpServletResponse response )
         throws ServletException, IOException 
   {
      String location = request.getParameter( "page" );

      if ( location != null ) 
         
         if ( location.equals( "deitel" ) )
            response.sendRedirect( "http://www.deitel.com" );
         else 
            if ( location.equals( "welcome1" ) )
               response.sendRedirect( "welcome1" );

      // code that executes only if this servlet
      // does not redirect the user to another page

      response.setContentType( "text/html" );
      PrintWriter out = response.getWriter();  

      // start XHTML document
      out.println( "<?xml version = \"1.0\"?>" );

      out.println( "<!DOCTYPE html PUBLIC \"-//W3C//DTD " +
         "XHTML 1.0 Strict//EN\" \"http://www.w3.org" +
         "/TR/xhtml1/DTD/xhtml1-strict.dtd\">" ); 

      out.println( 
         "<html xmlns = \"http://www.w3.org/1999/xhtml\">" );

      // head section of document
      out.println( "<head>" );
      out.println( "<title>Invalid page</title>" );
      out.println( "</head>" );

      // body section of document
      out.println( "<body>" );
      out.println( "<h1>Invalid page requested</h1>" );
      out.println( "<p><a href = " + 
         "\"servlets/RedirectServlet.html\">" );
      out.println( "Click here to choose again</a></p>" );
      out.println( "</body>" );

      // end XHTML document
      out.println( "</html>" );
      out.close();  // close stream to complete the page  
   }   
}

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