javaEE試驗報告--Servlet編程文檔良心出品

1、Java企業(yè)級開發(fā)(J2EE)實驗報告指導(dǎo)教師：王磊課程名稱：Java企業(yè)級開發(fā)(J2EE)年級：12實驗日期:2021-3-19姓名：xxx學號：03班級：2班實驗名稱：servlet 編程實驗序號：實驗三成員人數(shù)：1一、 實驗?zāi)康募耙髮嶒災(zāi)康模?、了解servlet的生命周期；2、掌握servlet如何接收和相應(yīng) 請求；3、servlet如何處理頁面跳轉(zhuǎn)時數(shù)據(jù)的傳送；實驗原埋：1、servlet獨立于效勞器和用戶平臺,使得 servlet可以移植并可以重用.2、servlet 是實現(xiàn) javax.servlet.Servlet接口類的一個實例.3、servlet會駐留在效勞器內(nèi)存中,可以

2、為某種目的委托效勞器執(zhí)行特定的 功能.二、實驗環(huán)境Microsoft SQL Server 2021, MyEclipse , Tomcat;三、實驗內(nèi)容及完成情況1、根底數(shù)據(jù)庫為實驗一所用數(shù)據(jù)庫2、編寫servlet程序,驗證用戶是否為合法的用戶,假設(shè)是非法用戶提示出錯,重新登錄,合 法用戶,那么登錄到主頁面,并顯示當前登錄用戶名.步驟如下：(1) file->new-> Web Project 點擊文件,新建 web 工程(2) 2、命名:ServletTestQ New Web ProjectCrsale a Wob ProjectCreate a web project i

3、n tfie workspace or an external locationProject Name：ServletTestWeb Prcject DetailsLocation:J Use default locationDirector/:D:Program File5IMyEclipse 8,xWorkspacesBrowse.Source foldersreWeb root folder:WebRootContext root URL: /ServletTestJ2EE SpBcification LevelJ2EE 1,4 J2EE 1.3Maven_ Add Maven sup

4、portLe用 i-n irmor辭審bout WavignAIVlYEsliD*,.JSTL SupportI Add JSTL libraries to WEB-INF/lib folder? ackbJeidFinish(3 3、新建如下幾個包貯 EJB Project前 Entcrpnse Applicotion PrgjcrtWeb PrajettWab £airv-ce ProjectJava ProjectRupert Web Projetl-iPaccaceChssSc urce Fol d erFelderFileAppletHTML Advflirccd Temp

5、lates；JS (Advanced lemplates) XHTML (Advanced Tempht«) SerdetUSi £eeslioii Eesne com.wl.corttrDller田 rornhwLdomain com .wl.se rvice coiriHwLiitils com.,wl.vi ew由ffilt(4) 在 com.wl.view 包下新建 LF轉(zhuǎn)J 肅看k JRE System Library c 'ir iisun jav 口 Jav3 EE 5 LibrariesX Web Rootservlet interfaceSeurr

6、e FolderFolderFileAppletHTML (Advanced IemplateJJSP (Advanced Templates)XHTML (Advanced Template£> ServletiiEJB3 Session BeanEJB3 Entity B/rtEJB2 Message Driven BeianXMLTeinplatesJXML (Basic Templates)(5)代碼如下:import import import import public publicjavax.servlet.ServletException;javax.servl

7、et. . Servlet;javax.servlet. . ServletRequest;javax.servlet. . ServletResponse;class Login extends Servlet void doGet( ServletRequest request, ServletResponseresponse) throws ServletException, lOException response.setContentType("text/html;charset=utf-8);PrintWriter out = response.getWriter();o

8、ut.println( out.println( out.println(method='post'>" );out.println(bordercolor='green'>"out.println(name='username'/></td></tr>"out.println("<center>" );"<h1>用戶登錄<用1>");"<form action='/Servl

9、etTest/LoginServlet'"<table border='1' cellspacing='0');"<tr><td>);"<tr><td>用戶名:密他:type='password' name='password'/></td></tr>"</td><td><input type='text'</td><td><

10、input);out.println( type='submit'value='"<tr><td colspan='2'><center><input登錄'/>"+清空"&nbsp&nbsp<input type='reset' value=' '/></center></td></tr>" out.println( "</table>&quo

11、t; );out.println("</form>");out.println("</center>" );)public void doPost( ServletRequest request, ServletResponse response)throws ServletException, IOException this .doGet(request, response);)(6)工程部署、發(fā)布(7)在瀏覽器的地址欄中輸入： :/localhost:8080/ServletTest/Login(8)觀察運行結(jié)果：9999(

12、9)解決亂碼問題response.setContentType( "text/html;charset=utf-8");(10)重新運行結(jié)果：用戶登錄(11)在工具包下放入工具類,將配置文件放入src文件夾下面；將sql數(shù)據(jù)庫的驅(qū)動放置在WebRoot/WEB-INF/lib文件夾下面(非常重要)(12)在 com.wl.view 下面創(chuàng)立 servlet ,命名為 Main代碼如下：package com.wl.view;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.S

13、ervletException;import javax.servlet. . Servlet;import javax.servlet. . ServletRequest;import javax.servlet. . ServletResponse;publicclass Main extends Servlet publicvoid doGet( ServletRequest request, ServletResponseresponse) throws ServletException, IOException response.setContentType( "text/

14、html;charset=utf-8");PrintWriter out = response.getWriter();out.println( "<h1> 登錄成功,主頁面！ </h1>");String username=(String) request.getAttribute("userinfo" );out.println( "歡送"+username+ "登錄！");)public void doPost( ServletRequest request, Servlet

15、Response response)throws ServletException, lOException this .doGet(request, response);)(13)編寫UserService效勞類package com.wl.service;import java.sql.ResultSet;import java.sql.SQLException;import com.wl.utils.SQLHelper;public class UserService public boolean checkUser(String username,String password) bo

16、olean b= false ;String sql= "select * from TUserLogin where username=? and password=?" ;String parameters=username,password;ResultSet rs=SQLHelper. executeQuery (sql, parameters); try if (rs.next() b= true ; else b= false ; catch (SQLException e) / TODOAuto-generated catch block e.printSta

17、ckTrace(); finally SQLHelper. close (rs, SQLHelper. getPs (), SQLHelper. getCt (); return b;(14)編寫登錄的限制器LoginServletpackage com.wl.controller;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet. . Servlet;import javax.servlet. . ServletReq

18、uest;import javax.servlet. . ServletResponse;import com.wl.service.UserService;public class LoginServlet extends Servlet public void doGet( ServletRequest request, ServletResponseresponse) throws ServletException, lOException response.setContentType( "text/html;charset=utf-8");PrintWriter

19、out = response.getWriter();獲取登錄頁面?zhèn)鬟f過來的參數(shù)String username=request.getParameter("username");String password=request.getParameter("password");/創(chuàng)立用戶效勞類對象 UserService userService= new UserService(); if (userService.checkUser(username, password)/判斷條件為真,那么頁面跳轉(zhuǎn)到主頁面,登錄成功/跳轉(zhuǎn)前,把用戶姓名放置在attribute 域中request.setAttribute("userinfo" , username);request.getRequestDispatcher("/Main" ).forward(request,response)