2012 第2章 Java Servlet扩展和增强Web服务器.ppt

Java Servlet;Outlines;Servlet Overview;Outlines;What is HTML;More about HTML ;Client/ Browser;HTTP Request and Response;Outlines;What Is a Servlet?;Example (1);Servlet generates an HTML response based on the input from the form. The Server returns the HTML document (response).;... form action=/Music/SearchServlet method=POST h3Music Store Search/h3brstrongType in the song title:/strong input type=text size=55 name=song_titlebr strongType in the song artist:/strong input type=text size=55 name=song_artistbr input type=submit value=SearchbrstrongDisplay the first /strong;POST /Music/SearchServlet HTTP/1.0 Referer: /musicSearch.html Connection: Keep-Alive User-Agent: Mozilla/4.72 [en] (WinNT 5.0; U) Host: localhost:8080 Cookie: USERID=spot Accept: image/gif, image/x-xbitmap, image/jpeg, */* Accept-Language: en Accept-Charset: iso-8859-1,*,utf-8 Content-type: application/x-www-form-urlencoded Content-length: 50 song_title=Hellosong_artist=Joneslimit_number=20;HTTP/1.1 200 ok Content-Type: text/html Set-Cookie: sessionid=5H2HXGYAAAAAEWQAAAAZJCI;Path=/ Cache-Control: no-cache=set-cookie,set-cookie2 Expires: Thu, 01 Dec 1994 16:00:00 GMT Set-Cookie: USERID=spot;Expires=Fri, 08-Jun-2001 21:54:37 GMT Content-Language: en HTML BODY H1Very simple dynamic document created on 01-Jun-2001/H1 /BODY /HTML;URL request response;Outlines;Building a Simple Java Servlet;package com.ibm.example.servlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.ServletException; import java.io.IOException; import java.io.PrintWriter; public class VerySimpleServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String browser = request.getHeader(User-Agent); response.setStatus(HttpServletResponse.SC_OK); // default response.setContentType(text/ht