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Convert attached servlet file to use ArrayList instead of using Enumeration string array. import java.io.*; import...

Convert attached servlet file to use ArrayList instead of using Enumeration string array.

import java.io.*;
import javax.servlet.*;
import javax.servlet.annotation.*;
import javax.servlet.http.*;
import java.util.*;


@WebServlet("/show-params")
public class ShowParameters extends HttpServlet {
  @Override
  public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
      throws ServletException, IOException {
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();
    String docType =
      "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 " +
      "Transitional//EN\">\n";
    String title = "Reading All Request Parameters";
    out.println(docType +
                "<HTML>\n" +
                "<HEAD><TITLE>" + title + "</TITLE></HEAD>\n" +
                "<BODY BGCOLOR=\"#FDF5E6\">\n" +
                "<H1 ALIGN=CENTER>" + title + "</H1>\n" +
                "<TABLE BORDER=1 ALIGN=CENTER>\n" +
                "<TR BGCOLOR=\"#FFAD00\">\n" +
                "<TH>Parameter Name<TH>Parameter Value(s)");
    Enumeration<String> paramNames = request.getParameterNames();
    while(paramNames.hasMoreElements()) {
      String paramName = paramNames.nextElement();
      out.print("<TR><TD>" + paramName + "\n<TD>");
      String[] paramValues =
        request.getParameterValues(paramName);
      if (paramValues.length == 1) {
        String paramValue = paramValues[0];
        if (paramValue.length() == 0)
          out.println("<I>No Value</I>");
        else
          out.println(paramValue);
      } else {
        out.println("<UL>");
        for(int i=0; i<paramValues.length; i++) {
          out.println("<LI>" + paramValues[i]);
        }
        out.println("</UL>");
      }
    }
    out.println("</TABLE>\n</BODY></HTML>");
  }

  @Override
  public void doPost(HttpServletRequest request,
                     HttpServletResponse response)
      throws ServletException, IOException {
    doGet(request, response);
  }
}
engineering   Computer-Science   
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Homework Answers

Answer #1

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Collections;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/show-params")
public class ShowParameters extends HttpServlet {
   @Override
   public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       response.setContentType("text/html");
       PrintWriter out = response.getWriter();
       String docType = "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 " + "Transitional//EN\">\n";
       String title = "Reading All Request Parameters";
       out.println(
               docType + "<HTML>\n" + "<HEAD><TITLE>" + title + "</TITLE></HEAD>\n" + "<BODY BGCOLOR=\"#FDF5E6\">\n"
                       + "<H1 ALIGN=CENTER>" + title + "</H1>\n" + "<TABLE BORDER=1 ALIGN=CENTER>\n"
                       + "<TR BGCOLOR=\"#FFAD00\">\n" + "<TH>Parameter Name<TH>Parameter Value(s)");
       // here we will get the enumaration only but we are converting it into List using list method
       List<String> list = Collections.list(request.getParameterNames());
       //using for each loop to iterate through the list
       for (String paramName : list) {
           out.print("<TR><TD>" + paramName + "\n<TD>");
           String[] paramValues = request.getParameterValues(paramName);
           if (paramValues.length == 1) {
               String paramValue = paramValues[0];
               if (paramValue.length() == 0)
                   out.println("<I>No Value</I>");
               else
                   out.println(paramValue);
           } else {
               out.println("<UL>");
               for (int i = 0; i < paramValues.length; i++) {
                   out.println("<LI>" + paramValues[i]);
               }
               out.println("</UL>");
           }
       }
       out.println("</TABLE>\n</BODY></HTML>");
   }

   @Override
   public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       doGet(request, response);
   }
}

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