Cấu trúc project
Creating a Java Dynamic Web Project
Creating a Java Servlet
HelloServlet.java
Servlet JSP 2018
package com.giaima;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class HelloServlet
*/
@WebServlet("/helloServlet")
public class HelloServlet extends HttpServlet {
private static final long serialVersionUID = 1 L;
/**
* @see HttpServlet#HttpServlet()
*/
public HelloServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
String name = request.getParameter("name");
if (name != "" || name != null) {
request.setAttribute("nameAtr", name);
RequestDispatcher rd = request.getRequestDispatcher("home.jsp");
rd.forward(request, response);
/*response.sendRedirect("home.jsp");*/
} else {
response.sendRedirect("index.jsp");
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
String name = request.getParameter("name");
if (name != "" || name != null) {
request.setAttribute("nameAtr", name);
RequestDispatcher rd = request.getRequestDispatcher("home.jsp");
rd.forward(request, response);
/*response.sendRedirect("home.jsp");*/
} else {
response.sendRedirect("index.jsp");
}
}
}
Creating a JSP Page
index.jsp
Servlet JSP 2018
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action="helloServlet" method="GET">
Name: <input type="text" name="name"/>
<button>GET</button>
</form>
<form action="helloServlet" method="POST">
Name: <input type="text" name="name"/>
<button>POST</button>
</form>
</body>
</html>
home.jsp
Servlet JSP 2018
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1> Home Page</h1>
<p>getParameter name: <%=request.getParameter("name") %></p>
<p>getAttribute name: <%=request.getAttribute("nameAtr") %></p>
</body>
</html>
Add config servlet mapping
web.xml
Servlet JSP 2018
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>servlet-jsp-helloworld-xml</display-name>
<servlet>
<servlet-name>helloServlet</servlet-name>
<servlet-class>com.giaima.HelloServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>helloServlet</servlet-name>
<url-pattern>/helloSevlet</url-pattern>
</servlet-mapping>
<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>
</web-app>
Result
27/10/2018
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