javaEE试验报告--Servlet编程文档良心出品

1、Java企业级开发(J2EE)实验报告指导教师：王磊课程名称：Java企业级开发(J2EE)年级：12实验日期:2021-3-19姓名：xxx学号：03班级：2班实验名称：servlet 编程实验序号：实验三成员人数：1一、 实验目的及要求实验目的：1、了解servlet的生命周期；2、掌握servlet如何接收和相应 请求；3、servlet如何处理页面跳转时数据的传送；实验原埋：1、servlet独立于效劳器和用户平台,使得 servlet可以移植并可以重用.2、servlet 是实现 javax.servlet.Servlet接口类的一个实例.3、servlet会驻留在效劳器内存中,可以

2、为某种目的委托效劳器执行特定的 功能.二、实验环境Microsoft SQL Server 2021, MyEclipse , Tomcat;三、实验内容及完成情况1、根底数据库为实验一所用数据库2、编写servlet程序,验证用户是否为合法的用户,假设是非法用户提示出错,重新登录,合 法用户,那么登录到主页面,并显示当前登录用户名.步骤如下：(1) file->new-> Web Project 点击文件,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辞审bout WavignAIVlYEsliD*,.JSTL SupportI Add JSTL libraries to WEB-INF/lib folder? ackbJeidFinish(3 3、新建如下几个包贮 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转J 肃看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)代码如下: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>用户登录<用1>");"<form action='/Servl

9、etTest/LoginServlet'"<table border='1' cellspacing='0');"<tr><td>);"<tr><td>用户名: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登录'/>"+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、发布(7)在浏览器的地址栏中输入： :/localhost:8080/ServletTest/Login(8)观察运行结果：9999(

12、9)解决乱码问题response.setContentType( "text/html;charset=utf-8");(10)重新运行结果：用户登录(11)在工具包下放入工具类,将配置文件放入src文件夹下面；将sql数据库的驱动放置在WebRoot/WEB-INF/lib文件夹下面(非常重要)(12)在 com.wl.view 下面创立 servlet ,命名为 Main代码如下：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> 登录成功,主页面！ </h1>");String username=(String) request.getAttribute("userinfo" );out.println( "欢送"+username+ "登录！");)public void doPost( ServletRequest request, Servlet

15、Response response)throws ServletException, lOException this .doGet(request, response);)(13)编写UserService效劳类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)编写登录的限制器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();获取登录页面传递过来的参数String username=request.getParameter("username");String password=request.getParameter("password");/创立用户效劳类对象 UserService userService= new UserService(); if (userService.checkUser(username, password)/判断条件为真,那么页面跳转到主页面,登录成功/跳转前,把用户姓名放置在attribute 域中request.setAttribute("userinfo" , username);request.getRequestDispatcher("/Main" ).forward(request,response)