Redirecting a request using servlets and the setHeader method not working

Question

I am new to servlet development  and I was reading an ebook  and found that I can redirect to a different web page using   setHeader  Location    http   www google com     But this is not working  as I have written this code as   import java io    import javax servlet    import javax servlet http     public class ModHelloWorld extends HttpServlet          public void doGet HttpServletRequest request  HttpServletResponse response  throws IOException                  response addHeader  Location    http   www google com                    response setHeader  Location    http   www google com                    response setContentType  text html                    PrintWriter pw   response getWriter                    pw println   lt html gt  lt head gt  lt title gt Modified Hello World lt  title gt  lt  head gt  lt body gt                     pw println   lt h1 gt                       getInitParameter function reads the contents ot init-param elements                  pw println getInitParameter  message                     pw println   lt  h1 gt                     pw println   lt  body gt  lt  html gt                     pw close                  i have checked the headers using my program to get the headers of the webpage which is as under   import java net    import java io    class getHeaders      public static void main String args             URL url   null          URLConnection urc   null          try               url   new URL args 0                urc   url openConnection                for int i 0     i                      String name   urc getHeaderFieldKey i                   String value   urc getHeaderField i                   if name    null  amp  amp  value    null   both null so end of header                     break                  else if name    null    first line of header                      System out println  Server HTTP version  Response code                          System out println value                       System out println  ENd of first header field                      else                       System out println  name of header is      name     and its value is       value                                             catch MalformedURLException e               System out println  Malformed URL     e getMessage               catch IOException e               e printStackTrace                        And i am getting the output as   Server HTTP version  Response code   HTTP 1 1 200 OK ENd of first header field name of header is  Server and its value is   Apache-Coyote 1 1 name of header is  Location and its value is   http   www google com name of header is  Content-Type and its value is   text html name of header is  Content-Length and its value is   101 name of header is  Date and its value is   Sat  05 Mar 2011 15 27 29 GMT   But I was not redirected to google s page from my browser   Thanks in advance

User · Answer

Oh no no  That s not how you redirect  It s far more simpler   public class ModHelloWorld extends HttpServlet      public void doGet HttpServletRequest request  HttpServletResponse response  throws IOException          response sendRedirect  http   www google com              Also  it s a bad practice to write HTML code within a servlet  You should consider putting all that markup into a JSP and invoking the JSP using   response sendRedirect   path to mynewpage jsp

User · Answer

As you can see  the response is still HTTP 1 1 200 OK  To indicate a redirect  you need to send back a 302 status code   response setStatus HttpServletResponse SC FOUND      SC FOUND   302

User · Answer

Another way of doing this if you want to redirect to any url source after the specified point of time import javax servlet ServletException   import javax servlet http HttpServlet   import javax servlet http HttpServletRequest   import javax servlet http HttpServletResponse   import java io     public class MyServlet extends HttpServlet      public void doGet HttpServletRequest request HttpServletResponse response  throws IOException     response setContentType  quot text html quot     PrintWriter pw response getWriter     pw println  quot  lt b gt  lt centre gt Redirecting to Google lt br gt  quot      response setHeader  quot refresh  quot 5 https   www google com  quot       redirects to url  after 5 seconds   pw close

User · Answer

Alternatively  you could try the following   resp setStatus 301   resp setHeader  Location    index jsp    resp setHeader  Connection    close

[java] Redirecting a request using servlets and the "setHeader" method not working

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