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A.3 Handling the Client Request: Form Data

523

A.3 Handling the Client Request: Form Data

Reading Parameters

  request.getParameter: returns first value

  request.getParameterValues: returns array of all values

Example Servlet

ThreeParams.java

package coreservlets;

import java.io.*;

import javax.servlet.*;

import javax.servlet.http.*;

public class ThreeParams extends HttpServlet {

  public void doGet(HttpServletRequest request,

                    HttpServletResponse response)

      throws ServletException, IOException {

    response.setContentType("text/html");

    PrintWriter out = response.getWriter();

    String title = "Reading Three Request Parameters";

    out.println(ServletUtilities.headWithTitle(title) +

                "\n" +

                "
" + title + "
\n" +

                "
\n" +

                "  
param1: "

                + request.getParameter("param1") + "\n" +

                "  
param2: "

                + request.getParameter("param2") + "\n" +

                "  
param3: "

                + request.getParameter("param3") + "\n" +

                "\n" +

                "");

  }

}

Second edition of this book: www.coreservlets.com; Sequel: www.moreservlets.com.

Servlet and JSP training courses by book's author: courses.coreservlets.com.