Servlet / JSP 전 혜 영전 혜 영 전 혜 영전 혜 영

0. 목차  Web Application Technologies  Servlet Server  Simple Servlet  Servlet / HTML Form  Deployment Descriptor  Servlet Context  MVC Parrern  Cookie / Session  Error Handling

Web Application Technologies

Client-Server Architecture

HTTP C-S Architecture

CGI Programs on the Web Server

기존 CGI Programs

Servlets on the Web Server

Servlet Program

The Model2 Architecture

J2EE Architecture

Web Application Migration

Servlet Engine

Servlet Server Programs  JDK 설치  JAVA_HOME=C:\J2SDK1.X  Path=.;%JAVA_HOME\bin  classpath=.;C:\....\X.jar  Servlet Server  TOMCAT(  RESIN(  Home 경로 추가  servlet.jar 경로 classpath 에 추가

TOMCAT ./Tomcat/bin\startup.bat

TOMCAT Configuration  Tomcat  bin  startup.bat, shutdown.bat  conf  server.xml, web.xml  webapps  ROOT  WEB-INF  Classes  web.xml  html, jsp  work

Resin ./resin\bin/httpd.exe

Resin

Resin Configuration  bin  httpd.exe  conf  resin.conf, app-default.xml  doc  WEB-INF  classes  work  html, jsp  lib  resin.jar  webapps  config.xml

Simple Servlet

The NetServer Architecture

The Generic Servlet API

Generic Servlet Code import javax.servlet.GenericServlet; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import java.io.PrintWriter; import java.io.IOException; public class HelloServlet extends GenericServlet { public void service(ServletRequest request, ServletResponse response) throws IOException { PrintWriter out = response.getWriter(); out.println(“Hello, World!!”); out.close(); }

Hypertext Transfer Protocol

HTTP (Hypertext Transfer Protocol)  request/reponse  header  entity body  HTTP 동작 방식  GET  POST  HEAD  PUT  DELETE  TRACE  OPTIONS

GET url HTTP/1.1 요청에 대한 정보 GET/POST Request POST url HTTP/1.1 요청에 대한 정보 요청의 일부로 전송되는 정보

 GET  소량의 데이타 전송  HTTP 의 헤더로 데이타 전송  URL 창에 보내는 데이타가 보임  URL 창에 이라고 요청하 는 것 자체가 GET 방식 ( default )  POST  HTTP 의 몸체로 데이타 전송  대량의 데이타 ( 예, 파일전송 ) 전송시  URL 창에 데이타가 안보이기에 보안에 좋음

Web Container Architecture

SequenceDiagram - HTTP GetRequest

The Http Servlet API

HttpServlet Code import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.PrintWriter; import java.io.IOException; public class HelloServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException { response.setContentType("text/html;charset=euc-kr"); PrintWriter out = response.getWriter(); out.println(" "); out.println(" "); out.println(" Hello Servlet "); out.println(" "); out.println(" Hello, World "); out.println(" "); out.println(" "); out.close(); }

Servlet Life Cycle

Servlet / HTML Form

FORM tag  action : 웹 서버에 전달되어 처리될 CGI 프로 그램 주소  method : get/post  enctype : 인코딩 타입  target : CGI 프로그램이 처리후 결과를 보여 줄 위치

HTML Form Components

Servlet API

Deployment Descriptor

 web-app  icon  display-name  description  distributable  context-param  filter  filter-mapping  listener  servlet  servlet-mapping  session-config  mime-mapping  welcome-file-list  error-page  taglib  resource-env-ref  resource-ref  security-constraint  login-config  security-role  env-entry  ejb-ref  ejb-local-ref  Filter  icon  filter-name  display-name  description  filter-class  init-param  param-name  param-value  description  filter-mapping  filter-name  url-parrern  servlet-name  servlet  icon  servlet-name  display-name  description  servlet-class  jsp-file  init-param  param-name  param-value  servlet-mapping  servlet-name  url-pattern

Initialization Parameters (web.xml) simpleServlet ServletTest dbDriver com.mysql.jdbc.Driver

Initialization Parameters (servlet.java) public class ServletTest extends HttpServlet{ private String driver; public void init(){ Driver=getInitParameter(“dbDriver”); } public void doGet(HttpServletRequest, httpServletResponse) throws ServletException, IOException{ … Out.println(driver);.. }

Servlet Config

Servlet Context

MVC Parrern

Cookie / Session

Error Handling