Java? ???? ?? ?? ???? ??? ? ????. ???? ???? ? ???? ??? ? ?????. ????? ?? ???? API? ??-?? ????? ???? ??????? ????? ??? ??? ???? ? ?????. ???? ?? ?? ?? ? ?? ??????? ??? ? ?? ?? ?? ?? ? ??? ???? ??? ?????. Java? ???? Java API ? JDBC? ?? ?? ??? ??? ?? ?????? ??????? ??????. ??? ???? ????, ? ?????, ??? ?? ??, ??? Java?? ???? ??? ????? ??? ???????.

?? ? ?????? ?? ?? ?? JAVA SERVLET - ?? ?? | 18? ?? ??? | 6?? ????

?? ????? ?? ?? ??

? ??, ????? ??, ????? ??? ?

???? ??? ???? ??? ? ????.

• ???? ? ??????? ??? ? ???? ?????
• ???? ??? ?? ??? ?????? ???? ???? API??? ???
• Java?? Servlet? ???? ?? ??? ????????
• ??? ??? ???? ???? ??? ???? ??????. ?? ??? ??? ?????.
• ?? ????? ???? ?? ??? ???? ? ??????? ???.

Java?? ???? ? ??????

??? ???? ?? ??? ?? ?? ????? ?? ?? ??? ????? ???.????? ?????, ??, ? ?? ??, ??? ?? API? ?????.????? ???? ????/??, ?????? ? ?? ??? ??? ?? ??? ??? ???? ????? ?? ? ????.

• Java? ???? CGI(Common Gateway Interface)? ???? ??? ????? ????? ???? CGI? ?? ???? ??? ????.
• ?? ???? ???? CGI?? ?? ?????.
• ???? Java? ??????? ??? ??????.
• ? ?? ?? ??? ?????. ????? ??? ???? ?? ??? ????? ?? ??? ????.
• Java ??? ?? ???? ???? ???? ? ??? ??? ????? ???? ??? ? ????.
• ???? ??, RMI ????? ?? ??????, ??? ?? ?? ?????? ??? ? ????.

Java?? ???? ??? ??????

Java? ???? ?? ?????, ?????? ??? ?? ??, ??? ????, ????? ?? ? ?? ?????? ?????. ???? ?? ??? ?? ?????.

1??: ?????? ? ??? ??? ??? ?????? ?? ??? ???(HTML ??, ??? ?? ?? HTTP ????? ????? ? ??)? ????.

2??: ?? ?? ? ??? ??? ????.

3??: ?? ?? ? ??? ??? ?? ???? ????, ?? ???? ???????? ??, ? ??? ?? ?? ?? ??? ??? ? ????.

4??: ?? ?? ???? ??? ???? ?? ???? ??? ?????. HTML?? XML, GIF(???? ??), Excel ? ?? ??? ?????.

5??: ?? ?? ? ???? ??? ?? ??? ????

6??: ?? ?? ? ??? ???? UI? ???? ?? ?????? ?????? ?? ??? ????.

??? ????

? ??? ????? ??? ?? ?? Java ???? ?????.

• Servlet.init(): Servlet ????? ????? ???? ???? ?????? ???? ?? Servlet? ?? ?????. ??? ???? service() ???? ???? ?????? ??? ?????. ?? destroy() ???? ???? ???? ???? ?????
• Servlet.destroy(): ???? ?? ?? ?? ?? ? ?? ???? ??? ????? ???? ??? ????.

Java?? ???? ???? ?

?? Java, Eclipse, Tomcat? ???? ???.

1. File-> ???-> ????? ? ????.

2. ???? ??? ???? ?? ???? ??? ? ??? ???? "web.xml ??"? ??? ? ?????

3. ???? ??? ?? ??? ????.

4. ?? ?? ??->? ?????. ? ???? ?????.

5. ??? ??? ?????. ?? Eclipse? ?? ???? ??? ?? ?? ??? ???? ??? ???? ?????.

??:

FirstProgram.java

package com.srccode.example;
import java.io.IOException;
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 FirstProgram
*/
@WebServlet("/FirstProgram")
public class FirstProgram extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public FirstProgram() {
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
response.getWriter().append("Served at: ").append(request.getContextPath());
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}

??? ??? ??? ??? ?? ???????.

??? com.srccode.example;

import java.io.IOException;
import java.io.PrintWriter;
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 FirstProgram
*/
@WebServlet("/FirstProgram")
public class FirstProgram extends HttpServlet {
private static final long <em>serialVersionUID</em> = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public FirstProgram() {
super();
// TODO Auto-generated constructor stub
}
private String mymsg;
public void init() throws ServletException {
mymsg = "Hi eduCBA Team! We are working on Java Servlet Tutorial! This is the first Servlet Program!";
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.setContentType("text/html");
PrintWriter printWriter = response.getWriter();
printWriter.println("<h1>" + mymsg + "</h1>");
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}

web.xml??

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>ServletExample</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>
</web-app>

index.html??

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>BeginnersBook Servlet Demo</title>
</head>
<body>
<a href="welcome">Click to call Servlet</a>
</body>
</html>

??:

???, ????? ???? Run As->? ?????. ???? ?????.

?? ????? ?? ?? ??? ? ? ????. ??? localhost:

?? ?????.

http://localhost:8080/ServletExample/FirstProgram

Java ???? ??

Java? Servlet?? ?? ??? ????. ???? ?? ??? ???? ????? ??? ? ????.

• ???? ???: ???? ???? ??? ???? ? ??? ?? destroy() ???? ??? ??? ??? ??? ?? ????. ??????? ? ?? ??? ???? ??? ??????? ?? ?? ??? ??? ? ????. ?????? ?? ?? ??? ???? ? ???? ??? ??? ??
• ???? ?? ?????: ?, ???? ?? ?? ??? ?????. ?, ? ?? ???? ??? ????? ?? ?? ???? ??? ? ????
• ???? ??? ??????: ???? ??? ???? ?? ? ??? ?????
• ???? ???? ??????: ???? FTP, Telnet ?? ?? ?? ????? ??? ? ????. HTTP ????? ?? ??? ??? ?????
• ???? ?????: ??? ???? ?? ? ?????? ? ????? ????? ? ??? ??? ?? ?? ??? ?????.
• ???? ?? ?????: ???? ??? ?? ??? ?? ??? ???? ???? ? ????
• ???? ????: ??? ???? ?????? ?????? ?? ???? ??? ?? ? ??? ?????. ?? ?? ?? ? ??? ??? ?????.
• ???? ?????: ????? ????? ?? ??? ??? ??? ? ?? ?? ? ??? ?? ????.

???? 'Java? ???' ??? ??????. ??? Java?? ???? ????, ??? ????? ??? ?? ???????. ??? ?? ? ??? ???? ??? ????? ??? ??? ???? ???? ???? ???? ??? ?????. ?? Java?? ???? ???? ??? CGI? ?? ??? ??????. ???? ?? ? ?? ??? ??? ? ???, ?? ??? ??? ??? ????. ?? ?????? ? ??? ??? ????.

? ??? ??? ???? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!