Tutorial Servlet: Memulai dengan JSP – Contoh Servlet

Diterbitkan: 2013-07-16

Contoh Servlet JSP oleh Crunchify

Berikut adalah contoh JSP – Servlet sederhana dengan petunjuk langkah demi langkah. Saya akan mendemonstrasikan cara mengambil parameter permintaan di JSP – Contoh Servlet.

Berikut adalah langkah-langkah yang akan kita lakukan:

  • Buka Eclipse IDE.
  • Buat Proyek Web Dinamis baru CrunchifyJSPServletExample.
  • Buat file HelloCrunchify.java extends HttpServlet (Daftar semua 200 Contoh Java).
  • Buat file Crunchify.jsp .
  • file web.xml (file deskriptor penerapan).
    • Jika Anda tidak melihat file web.xml, temukan solusinya di sini.
  • Tambahkan dan Jalankan proyek di Tomcat Web Server.

Berikut adalah struktur proyek lengkap:

Struktur Proyek Eclipse Servlet JSP Crunchify

Langkah 1

Buat file HelloCrunchify.java

HelloCrunchify.java
Java
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package com . crunchify . jsp . servlet ;
 
import java . io . IOException ;
import javax . servlet . ServletException ;
import javax . servlet . http . HttpServlet ;
import javax . servlet . http . HttpServletRequest ;
import javax . servlet . http . HttpServletResponse ;
import java . io . PrintWriter ;
 
/**
* @author Crunchify.com
*/
 
public class HelloCrunchify extends HttpServlet {
     protected void doGet ( HttpServletRequest request , HttpServletResponse response ) throws ServletException , IOException {
         // reading the user input
         String username = request . getParameter ( "username" ) ;
         String password = request . getParameter ( "password" ) ;
         PrintWriter out = response . getWriter ( ) ;
         out . println (
                   "<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" +" +
                       "http://www.w3.org/TR/html4/loose.dtd\">\n" +
                   "<html> \n" +
                     "<head> \n" +
                       "<meta http-equiv=\"Content-Type\" content=\"text/html; " +
                         "charset=ISO-8859-1\"> \n" +
                       "<title> Crunchify.com JSP Servlet Example  </title> \n" +
                     "</head> \n" +
                     "<body> <div align='center'> \n" +
                       "<style= \"font-size=\"12px\" color='black'\"" + "\">" +
                         "Username: " + username + " <br> " +
                         "Password: " + password +
                     "</font></body> \n" +
                   "</html>"
                 ) ;       
         }
}

Yang lain harus membaca:

  • Cara Menjalankan Program Java Secara Otomatis di Tomcat Startup
  • Cara menggunakan AJAX, jQuery di Spring Web MVC (.jsp) – Contoh

Langkah 2

Buat file Crunchify.jsp :

Crunchify.jsp
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<% @ page language = "java" contentType = "text/html; charset=ISO-8859-1"
     pageEncoding = "ISO-8859-1" %>
< ! DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
     "http://www.w3.org/TR/html4/loose.dtd" >
< html >
<style type ="text/css">
body {
     background-image :
         url ( 'https://cdn.crunchify.com/wp-content/uploads/2013/03/Crunchify.bg_.300.png' ) ;
}
</style>
 
< head >
< meta http - equiv = "Content-Type" content = "text/html; charset=ISO-8859-1" >
< title > Crunchify JSP Servlet Example < / title >
< / head >
< body >
 
     < div align = "center" style = "margin-top: 50px;" >
 
         < form action = "CrunchifyServlet" >
             Please enter your Username :    < input type = "text" name = "username" size = "20px" > < br >
             Please enter your Password :    < input type = "text" name = "password" size = "20px" > < br > < br >
         < input type = "submit" value = "submit" >
         < / form >
 
     < / div >
 
< / body >
< / html >

Langkah-3

Perbarui file web.xml :

web.xml
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<? xml version = "1.0" encoding = "UTF-8" ?>
< web - app xmlns : xsi = "http://www.w3.org/2001/XMLSchema-instance"
     xmlns = "http://java.sun.com/xml/ns/javaee" xmlns : web = "http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
     xsi : schemaLocation = "http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
     version = "3.0" >
     < display - name > CrunchifyJSPServletExample < / display - name >
     < welcome - file - list >
         < welcome - file > index . html < / welcome - file >
         < welcome - file > index . htm < / welcome - file >
         < welcome - file > index . jsp < / welcome - file >
         < welcome - file > default . html < / welcome - file >
         < welcome - file > default . htm < / welcome - file >
         < welcome - file > default . jsp < / welcome - file >
     < / welcome - file - list >
     < servlet >
         < servlet - name > Hello < / servlet - name >
         < servlet - class > com . crunchify . jsp . servlet . HelloCrunchify < / servlet - class >
     < / servlet >
     < servlet - mapping >
         < servlet - name > Hello < / servlet - name >
         < url - pattern > / CrunchifyServlet < / url - pattern >
     < / servlet - mapping >
< / web - app >

Langkah-4

Menyebarkan dan Menjalankan CrunchifyJSPServletExample di Tomcat.

Menyebarkan Proyek Servlet JSP Crunchify di Tomcat

Langkah-5

Arahkan URL Anda ke http://localhost:8080/CrunchifyJSPServletExample/Crunchify.jsp

Langkah-6

Hasil Checkout. URL Anda akan terlihat seperti ini: http://localhost:8080/CrunchifyJSPServletExample/CrunchifyServlet?username=crunchify&password=Password

Hasil Servlet Crunchify

Perhatikan bahwa server tidak mengenali perubahan dalam " web.xml " kecuali jika Anda memulai ulang, atau memulai, server.