關於分級自測題，我們知道該系統一共分為兩個角色，一個是讀者，一個是管理員，我們需要根據不同用戶去到不同的頁面，所以我們需要寫一個登陸界面。
本文先寫這個功能的實現，該功能主要在servlet里面實現。
一.先寫jsp頁面
<%@ page language="java" contentType="text/html; charset=UTF-8"//denglu.jsp pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>圖書管理系統：登陸界面</title> </head> <body> <% Object message = request.getAttribute("message"); if(message!=null && !"".equals(message)){ %> <script type="text/javascript"> alert("<%=request.getAttribute("message")%>"); </script> <%} %> <% Object message1 = request.getAttribute("message1");//顯示注冊成功（下一篇博客） if(message1!=null && !"".equals(message1)){ %> <script type="text/javascript"> alert("<%=request.getAttribute("message1")%>"); </script> <%} %> <form action="login_servlet?method=login" method="post"> <table align="center" border="1" width="500"> <tr> <td>賬號: </td> <td> <input type="text" name="studentid" id="studentid" /> </td> </tr> <tr> <td>密碼: </td> <td> <input type="password" name="password"/> </td> </tr> <tr> <td>身份: </td> <td> <select name="form">//這里傳值給servlet <option value="讀者"selected>讀者</option> <option value="管理員"selected>管理員</option> </select> </td> </tr> <tr align="center"> <td colspan="2"> <input type="submit" value="登錄" onclick="return judge()" /> <a href="zhuce.jsp" >點擊注冊</a> </td> </tr> </table> </body> </html>
reader.jsp//讀者功能
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" import="Bean.*,java.util.ArrayList,util.*,dao.*,servlet.*"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> </head> <body> <a href="book_servlet?method=looklist" ><h3>瀏覽圖書信息</h3></a> <a href="goodbook1.jsp" ><h3>查詢圖書信息</h3></a> <a href="book_servlet?method=delist" ><h3>借閱圖書</h3></a> <a href="book_servlet?method=borrowlist&borrower=<%=good.getStudentid()%>"><h3>瀏覽催還書目</h3></a> <a href="book_servlet?method=cuihuan" ><h3>歸還圖書</h3></a> </body> </html>
genlist.jsp//管理員功能
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" import="Bean.*,java.util.ArrayList,util.*,dao.*,servlet.*"%> <html> <head> <meta charset="UTF-8"> <title>管理員界面</title> </head> <body> <a href="addstudent.jsp" ><h3>添加讀者信息</h3></a> <a href="addbook.jsp" ><h3>添加新書信息</h3></a> <a href="update.jsp" ><h3>打印催還書信息</h3></a> </body> </html>
二.servlet層
package servlet; 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; import javax.servlet.http.HttpSession; import Bean.xinxi; import dao.dao; import daoimpl.daoimpl; /** * Servlet implementation class login_servlet */ @WebServlet("/login_servlet") public class login_servlet extends HttpServlet { private static final long serialVersionUID = 1L; dao gooddao=new daoimpl(); /** * @see HttpServlet#HttpServlet() */ public login_servlet() { 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 doPost(request, response); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub request.setCharacterEncoding("UTF-8"); response.setCharacterEncoding("UTF-8"); String method=request.getParameter("method"); String form=request.getParameter("form");//獲取來自denglu.jsp里面的數據if("login".equals(method)) { //通過判斷語句進入不同頁面if(form.equals("讀者"))request.getRequestDispatcher("reader.jsp").forward(request, response); else if(form.equals("管理員"))request.getRequestDispatcher("genlist.jsp").forward(request, response); } }
三.運行結果
這里只是一個前端頁面，沒有與數據庫打交道，下一篇寫驗證賬號密碼是否正確，需要實現注冊功能，連接數據庫。
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