การ submit เว็บผ่าน java class

1.File dataAction.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<%

String firstName = request.getParameter("fname");

String lastName = request.getParameter("lname");

String idCard = request.getParameter("idcard");

String date = request.getParameter("date");

System.out.println("firstName : " + firstName);

System.out.println("lastName : " + lastName);

System.out.println("idCard : " + idCard);

System.out.println("date : " + date);

System.out.println("############################################");

   %>

2.Class HtmlSubmitServlet.java 

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.PrintWriter;

import java.net.URL;

import java.net.URLConnection;

public class HtmlSubmitServlet {

                // the hard-coded URL to the Service I want to invoke (should be injected of

                // course)

                private static final String BASE_URL = "http://localhost:8080/TestWEB/dataAction.jsp";

                public static void main(String[] args) {

                                HtmlSubmitServlet h = new HtmlSubmitServlet();

                                String firstName = "Tester";

                                String lastName = "java";

                                String idCard = "123456678";

                                String date = "12/10/1985";

                                h.submitData(firstName, lastName, idCard, date);

                }

                public void submitData(String firstName, String lastName, String idCard, String date) {

                                try {

                                                URL url = new URL(BASE_URL);

                                                URLConnection con = url.openConnection();

                                                // inform the connection that we will send output and accept input

                                                con.setDoInput(true);

                                                con.setDoOutput(true);

                                                // Don't use a cached version of URL connection.

                                                con.setUseCaches(false);

                                                con.setDefaultUseCaches(false);

                                                con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

                                                // define a new PrintWriter on the output stream

                                                PrintWriter outWriter = new PrintWriter(con.getOutputStream());

                                                // send data to the servlet

                                                outWriter.print("fname=" + firstName);

                                                outWriter.print("&lanme=" + lastName);

                                                outWriter.print("&idcard=" + idCard);

                                                outWriter.print("&date=" + date);

                                                outWriter.close();

                                                InputStream input = con.getInputStream();

                                                File outputFile = new File("z.txt");

                                                FileOutputStream out = new FileOutputStream(outputFile);

                                                boolean eof = false;

                                                // read all bytes from the input and write them to the output

                                                while (!eof) {

                                                                int byteValue = input.read(); // read the stream

                                                                out.write(byteValue);

                                                                if (byteValue == -1)

                                                                                eof = true;

                                                }

                                                out.close();

                                } catch (FileNotFoundException fnfe) {

                                                fnfe.printStackTrace();

                                } catch (IOException ioe) {

                                                ioe.printStackTrace();

                                }

                }

}

ขั้นตอนการทำงาน  ให้ทำการ run file jsp ทิ้งไว้ จากนั้นให้มารัน .java เราจะเห็น output ที่ console

   ผลลัพธ์ที่ได้… 

firstName : Tester

lastName : java

idCard : 123456678

date : 12/10/1985

############################################