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Date: Tue, 17 May 2016 23:25:11 -0400
Message-ID: <CAGcL9UOvmRU7VESpRM2y4FAdcAP7ctOMzzsj24rrwJyNWQUwKQ@mail.gmail.com>
Subject: request.getParameter and special characters - Apache Tomcat/7.0.57 on
 win 7
From: Kiran Badi <kiran@poonam.org>
To: Tomcat Users List <users@tomcat.apache.org>
Content-Type: multipart/alternative; boundary=001a11407b28c18f21053315675e
archived-at: Wed, 18 May 2016 03:25:19 -0000

--001a11407b28c18f21053315675e
Content-Type: text/plain; charset=UTF-8

Hi ,

I have this link in jsp which has below tags,

<%@page contentType="text/html" pageEncoding="UTF-8"%>

 <a href="TestServlet?teststring=testing&amp;testing1">Testing</a>

and then my servlet looks like below,

/*
 * To change this license header, choose License Headers in Project
Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package controller;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author Kiran
 */
@WebServlet(name = "TestServlet", urlPatterns = {"/TestServlet"})
public class TestServlet extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and
<code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request,
HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        try (PrintWriter out = response.getWriter()) {
            /* TODO output your page here. You may use following sample
code. */
            String param = request.getParameter("teststring");
            String param1 = new
String(request.getParameter("teststring").getBytes("UTF-8"));
            out.println("<!DOCTYPE html>");
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet TestServlet</title>");
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet TestServlet at " +
request.getContextPath() + "</h1>");
            out.println("<h1>Servlet TestServlet at " + param + "</h1>");
            out.println("<h1>Servlet TestServlet at " + param1 + "</h1>");
            out.println("</body>");
            out.println("</html>");
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods.
Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse
response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse
response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

   }

and getParameter for some reason seems to truncating the value after &

Servlet TestServlet at testingServlet TestServlet at testing

I really need to understand as what characters are accepted and what
characters get truncated with getParameter.

I am building few links on the fly which might have space,backslashes,
comma and & characters in it.So wanted to understand should I encode it via
js or container can take care of those for me.

container connector setting has URIEncoding="UTF-8" settings.

Thanking you
Kiran Badi

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