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Tutorials :
Server-Side Web Applications Using Servlets and JSP :
Accessing the Standard CGI Variables :
| Contents |
| Introduction to CGI Variables |
| Servlet Equivalent of Standard CGI Variables |
| Example: Reading the CGI Variables |
3. Example: Reading the CGI Variables
Here's a servlet that creates a table showing the values of all the CGI variables other thanHTTP_XXX_YYY, which are just the
HTTP request headers shown in the previous section.
3.1 ShowCGIVariables.java
You can also download the source or try it on-line. Note: also uses ServletUtilities.java, shown earlier.package hall; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.util.*; /** Creates a table showing the values of all the CGI variables. ** Part of tutorial on servlets and JSP that appears at * http://www.apl.jhu.edu/~hall/java/Servlet-Tutorial/ * 1999 Marty Hall; may be freely used or adapted. */ public class ShowCGIVariables extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); String[][] variables = { { "AUTH_TYPE", request.getAuthType() }, { "CONTENT_LENGTH", String.valueOf(request.getContentLength()) }, { "CONTENT_TYPE", request.getContentType() }, { "DOCUMENT_ROOT", getServletContext().getRealPath("/") }, { "PATH_INFO", request.getPathInfo() }, { "PATH_TRANSLATED", request.getPathTranslated() }, { "QUERY_STRING", request.getQueryString() }, { "REMOTE_ADDR", request.getRemoteAddr() }, { "REMOTE_HOST", request.getRemoteHost() }, { "REMOTE_USER", request.getRemoteUser() }, { "REQUEST_METHOD", request.getMethod() }, { "SCRIPT_NAME", request.getServletPath() }, { "SERVER_NAME", request.getServerName() }, { "SERVER_PORT", String.valueOf(request.getServerPort()) }, { "SERVER_PROTOCOL", request.getProtocol() }, { "SERVER_SOFTWARE", getServletContext().getServerInfo() } }; String title = "Servlet Example: Showing CGI Variables"; out.println(ServletUtilities.headWithTitle(title) + "<BODY BGCOLOR=\"#FDF5E6\">\n" + "<H1 ALIGN=CENTER>" + title + "</H1>\n" + "<TABLE BORDER=1 ALIGN=CENTER>\n" + "<TR BGCOLOR=\"#FFAD00\">\n" + "<TH>CGI Variable Name<TH>Value"); for(int i=0; i<variables.length; i++) { String varName = variables[i][0]; String varValue = variables[i][1]; if (varValue == null) varValue = "<I>Not specified</I>"; out.println("<TR><TD>" + varName + "<TD>" + varValue); } out.println("</TABLE></BODY></HTML>"); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }
3.2 ShowCGIVariables Output
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This page is part of my Tutorial on Servlets and JSP. © 1999 Marty Hall. All source code freely available for unrestricted use.
This tutorial was a very early outline of the material that eventually became Core Servlets and JavaServer Pages (Sun Microsystems Press and Prentice Hall, May 2000). See http://www.coreservlets.com/ for the topics covered, table of contents, index, reader reviews, and complete source code archive.
This tutorial is now available as a book: Core Servlets and JavaServer Pages by Marty Hall, published by Sun Microsystems Press. Read all about it at CoreServlets.com
Server-Side Web Applications using Java Servlets versions 2.1/2.2 and JavaServer Pages (JSP) version 1.0: A Tutorial
© 1999-2000 Marty Hall.
All source code freely available for unrestricted use.
Created for work in the Research and Technology Development Center of the Johns Hopkins University Applied Physics Lab, for courses in the Johns Hopkins Part-Time MS Program in Computer Science, and for various industry seminars and on-site Java short courses.
Please note that this is a first draft of the tutorial, so please send corrections, comments, and suggestions to me at hall@apl.jhu.edu.
Reprinted with permission from the author. Click here to visit the original version
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