servlets_tutorial

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Java Servlets Methods to Set HTTP Status Code The following methods can be used to set HTTP Status Code in your servlet program. These methods are available with HttpServletResponse object. S.N. 1 2 3 Method & Description public void setStatus ( int statusCode ) This method sets an arbitrary status code. The setStatus method takes an int (the status code) as an argument. If your response includes a special status code and a document, be sure to call setStatus before actually returning any of the content with the PrintWriter. public void sendRedirect(String url) This method generates a 302 response along with a Location header giving the URL of the new document. public void sendError(int code, String message) This method sends a status code (usually 404) along with a short message that is automatically formatted inside an HTML document and sent to the client. HTTP Status Code Example Following is the example which would send a 407 error code to the client browser and browser would show you "Need authentication!!!" message. // Import required java libraries import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.util.*; // Extend HttpServlet class public class showError extends HttpServlet { // Method to handle GET method request. public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // Set error code and reason. response.sendError(407, "Need authentication!!!" ); } // Method to handle POST method request. 39
Java Servlets public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } } Now calling the above servlet would display the following result: HTTP Status 407 - Need authentication!!! type Status report messageNeed authentication!!! descriptionThe client must first authenticate itself with the proxy (Need authentication!!!). Apache Tomcat/5.5.29 40
Page 2 and 3: Java Servlets About the Tutorial Se
Page 4 and 5: Java Servlets 5. SERVLETS - FORM DA
Page 6 and 7: Java Servlets 15. SERVLET - HANDLIN
Page 8 and 9: 1. Servlets - Overview Java Servlet
Page 10 and 11: 2. Servlets - Environment Setup Jav
Page 12 and 13: Java Servlets Further information a
Page 14 and 15: 3. Servlets - Life Cycle Java Servl
Page 16 and 17: Java Servlets public void destroy()
Page 18 and 19: Java Servlets out.println("" + mess
Page 20 and 21: 5. Servlets - Form Data Java Servle
Page 22 and 23: Java Servlets + request.getParamete
Page 24 and 25: Java Servlets public void doGet(Htt
Page 26 and 27: Java Servlets Maths Physics Chemist
Page 28 and 29: Java Servlets import javax.servlet.
Page 30 and 31: Java Servlets Now calling servlet
Page 32 and 33: Java Servlets If-Unmodified-Since T
Page 34 and 35: Java Servlets 20 String getRemoteAd
Page 36 and 37: Java Servlets String paramValue = r
Page 38 and 39: Java Servlets Connection This heade
Page 40 and 41: Java Servlets 17 18 19 20 21 22 23
Page 42 and 43: Java Servlets Now calling the above
Page 44 and 45: Java Servlets 200 OK The request is
Page 48 and 49: 9. Servlets - Writing Filters Java
Page 50 and 51: Java Servlets /* Called before the
Page 52 and 53: Java Servlets LogFilter /* 45
Page 54 and 55: Java Servlets javax.servlet.Servlet
Page 56 and 57: Java Servlets } String requestUri =
Page 58 and 59: Java Servlets as programmed. For ex
Page 60 and 61: Java Servlets Host: zink.demon.co.u
Page 62 and 63: Java Servlets request.getParameter(
Page 64 and 65: Java Servlets public class ReadCook
Page 66 and 67: Java Servlets // Get an array of Co
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Page 70 and 71: Java Servlets The HttpSession Objec
Page 72 and 73: Java Servlets String userIDKey = ne
Page 74 and 75: Java Servlets Now try to run the sa
Page 76 and 77: 13. Servlets - Database Access Java
Page 78 and 79: Java Servlets { // JDBC driver name
Page 80 and 81: Java Servlets se.printStackTrace();
Page 82 and 83: Java Servlets File Upload: Select a
Page 84 and 85: Java Servlets // Check that we have
Page 86 and 87: Java Servlets getClass( ).getName(
Page 88 and 89: Java Servlets Getting Current Date
Page 90 and 91: Java Servlets public void doGet(Htt
Page 92 and 93: 16. Servlets - Page Redirection Jav
Page 94 and 95: 17. Servlets - Hits Counter Java Se
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Java Servlets PageHitCounter PageH
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Java Servlets .... SiteHitCounter
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Java Servlets response.setContentTy
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19. Servlets - Sending Email Java S
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Java Servlets "\n"; out.println(doc
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Java Servlets String from = "web@gm
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Java Servlets { // Recipient's emai
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Java Servlets "" + res + "\n" + "")
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Java Servlets { // Do required init
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21. Servlets - Debugging Java Servl
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Java Servlets very similar to how a
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22. Servlets - Internationalization
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Java Servlets Languages Setting A s
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Java Servlets "" + title + "\n" + "
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Java Servlets String title = "Local
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23. Servlet - Annotations Java Serv
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Java Servlets @WebServlet(value = "
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Java Servlets @Webfilter This is th
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Java Servlets Now, open the servlet
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