By GokiSoft.com|
19:15 05/08/2020|
Web Component Development (SERVJSP)
[Share Code] Tìm hiểu GET/POST - Session - Cookie trong JSP/Servlet - Lập trình JSP/Servlet
#web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
<servlet>
<servlet-name>FirstServletAlias</servlet-name>
<servlet-class>servlet.FirstServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>StudentServlet</servlet-name>
<servlet-class>servlet.StudentServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>InputStudentServlet</servlet-name>
<servlet-class>servlet.InputStudentServlet</servlet-class>
</servlet>
<servlet>
<servlet-name>DataStudentServlet</servlet-name>
<servlet-class>servlet.DataStudentServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>FirstServletAlias</servlet-name>
<url-pattern>/tim-hieu-servlet-bai-1.html</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>StudentServlet</servlet-name>
<url-pattern>/danh-sach-sinh-vien.html</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>InputStudentServlet</servlet-name>
<url-pattern>/nhap-thong-tin-sinh-vien.html</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>DataStudentServlet</servlet-name>
<url-pattern>/data-student-post.html</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
</web-app>
#first_servlet.jsp
<%--
Document : first-wervlet
Created on : Jul 27, 2020, 7:21:57 PM
Author : teacher
--%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<h1>Welcome to learn JSP/Servlet!</h1>
<h2>Hello :
<%
String msg = (String) request.getAttribute("msg");
out.println(msg);
%>
<br/>
<%=request.getAttribute("msg")%>
</h2>
</body>
</html>
#input.jsp
<%--
Document : input
Created on : Jul 31, 2020, 7:15:46 PM
Author : teacher
--%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<title>Registation Form * Form Tutorial</title>
<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"/>
<!-- jQuery library -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<!-- Popper JS -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
<!-- Latest compiled JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<div class="panel panel-primary">
<div class="panel-heading">
<h2 class="text-center">Registation Form - Input User's Detail Information</h2>
</div>
<div class="panel-body">
<form method="post" action="data-student-post.html">
<div class="form-group">
<label for="usr">Name:</label>
<input required="true" type="text" class="form-control" id="usr" name="name">
</div>
<div class="form-group">
<label for="gender">Gender</label>
<select name="gender" id="gender" class="form-control">
<option value=""> -- Chon Gioi Tinh -- </option>
<option value="Nam">Nam</option>
<option value="Nu">Nu</option>
<option value="Khac">Khac</option>
</select>
</div>
<div class="form-group">
<label for="rollno">RolNo</label>
<input type="text" class="form-control" id="rollno" name="rollno">
</div>
<button class="btn btn-success">Register</button>
</form>
</div>
</div>
</div>
</body>
</html>
#student.jsp
<%--
Document : student
Created on : Jul 31, 2020, 7:03:35 PM
Author : teacher
--%>
<%@page import="java.util.ArrayList"%>
<%@page import="modal.Student"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Danh Sach Sinh Vien - Fake</title>
</head>
<body>
<h1>Danh Sach Sinh Vien!</h1>
<table border = "1" cellspacing = "3" cellpadding = "3">
<thead>
<tr>
<th>STT</th>
<th>Ho & Ten</th>
<th>Email</th>
<th>Dia Chi</th>
<th>MSV</th>
</tr>
</thead>
<tbody>
<%
ArrayList<Student> list = (ArrayList<Student>) request.getAttribute("studentList");
int count = 1;
for (Student std : list) {
%>
<tr>
<td><%=count++%></td>
<td><%=std.getFullname()%></td>
<td><%=std.getEmail()%></td>
<td><%=std.getAddress()%></td>
<td><%=std.getRollNo()%></td>
</tr>
<%
}
%>
</tbody>
</table>
</body>
</html>
#welcome.jsp
<%--
Document : welcome
Created on : Jul 31, 2020, 7:23:55 PM
Author : teacher
--%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<%
// String name = (String) request.getParameter("name");
String name = (String) session.getAttribute("s_name");
Cookie[] cookieLIst = request.getCookies();
String k_name = "";
for (Cookie elem : cookieLIst) {
if(elem.getName().equals("k_name")) {
k_name = elem.getValue();
}
}
%>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Welcome - <%=name%></title>
</head>
<body>
<h1>Session: Welcome <%=name%>!</h1>
<h1>Cookie Welcome <%=k_name%>!</h1>
</body>
</html>
#Student.java
/*
* 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 modal;
/**
*
* @author teacher
*/
public class Student {
String fullname, email, address, rollNo;
public Student() {
}
public Student(String fullname, String email, String address, String rollNo) {
this.fullname = fullname;
this.email = email;
this.address = address;
this.rollNo = rollNo;
}
public String getFullname() {
return fullname;
}
public void setFullname(String fullname) {
this.fullname = fullname;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getRollNo() {
return rollNo;
}
public void setRollNo(String rollNo) {
this.rollNo = rollNo;
}
}
#DataStudentServlet.java
/*
* 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 servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
/**
*
* @author teacher
*/
public class DataStudentServlet extends HttpServlet {
// <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 {
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/welcome.jsp");
dispatcher.forward(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 {
String name = (String) request.getParameter("name");
HttpSession session = request.getSession();
session.setAttribute("s_name", name);
Cookie co = new Cookie("k_name", name);
response.addCookie(co);
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/welcome.jsp");
dispatcher.forward(request, response);
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}
#FirstServlet.java
/*
* 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 servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*
* @author teacher
*/
public class FirstServlet 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. */
out.println("<!DOCTYPE html>");
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet FirstServlet</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Servlet FirstServlet at " + request.getContextPath() + "</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 {
String msg = "TRAN VAN DIEP";
request.setAttribute("msg", msg);
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/first_servlet.jsp");
// dispatcher.include(request, response);
dispatcher.forward(request, response);
//dung forward => ko su dung code phia duoi => include : se su dung code duoi
response.setContentType("text/html;charset=UTF-8");
try (PrintWriter out = response.getWriter()) {
/* TODO output your page here. You may use following sample code. */
out.println("<!DOCTYPE html>");
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet FirstServlet</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Welcome to learn Servlet >> GET</h1>");
out.println("</body>");
out.println("</html>");
}
}
/**
* 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);
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}
#InputStudentServlet.java
/*
* 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 servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*
* @author teacher
*/
public class InputStudentServlet extends HttpServlet {
// <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 {
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/input.jsp");
dispatcher.forward(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 {
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}
#StudentServlet.java
/*
* 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 servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import modal.Student;
/**
*
* @author teacher
*/
public class StudentServlet extends HttpServlet {
// <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 {
ArrayList<Student> list = new ArrayList<>();
for (int i = 0; i < 10; i++) {
Student std = new Student("Ten " + i, i+"@gmail.com", "Ha Noi", "R00" + i);
list.add(std);
}
request.setAttribute("studentList", list);
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher("/student.jsp");
dispatcher.forward(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 {
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}
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