2.26

JavaWeb实现简单的登陆案例demo

1 <%@ page language="java" contentType="text/html; charset=UTF-8"
2 pageEncoding="UTF-8"%>
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11 <table align="center"
12 style="background-image: url(); background-repeat: no-repeat"
13 style="楷体" border="1" cellpadding="5" cellspacing="1">
14
15 图书借阅系统登陆入口
16
17 <form action="${pageContext.request.contextPath}/loginservlet"
18 method="post">
19
20 用户名
21

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25 密码
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servlet

1 package loginservlet;
2
3 import java.io.IOException;
4 import javax.servlet.ServletException;
5 import javax.servlet.annotation.WebServlet;
6 import javax.servlet.http.HttpServlet;
7 import javax.servlet.http.HttpServletRequest;
8 import javax.servlet.http.HttpServletResponse;
9
10 import repository.LoginRepository;
11
12 /**
13 * Servlet implementation class loginservlet
14 /
15 @WebServlet("/loginservlet")
16 public class loginservlet extends HttpServlet {
17 private static final long serialVersionUID = 1L;
18 /*
19 * @see HttpServlet#HttpServlet()
20 /
21 public loginservlet() {
22 super();
23 // TODO Auto-generated constructor stub
24 }
25
26 /*
27 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
28 /
29 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
30 // TODO Auto-generated method stub
31 response.getWriter().append("Served at: ").append(request.getContextPath());
32 }
33
34 /*
35 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
36 */
37 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
38 // TODO Auto-generated method stub
39 request.setCharacterEncoding("utf-8");
40 response.setCharacterEncoding("utf-8");
41 response.setContentType("application/json;charset=utf-8");
42 String passname=request.getParameter("passname");
43 String password=request.getParameter("password");
44 String mark=LoginRepository.checklogin(passname, password);
45 request.setAttribute("passname", passname);
46 request.setAttribute("password", password);
47 if(mark==null) {
48 mark="3";
49 request.getRequestDispatcher("login.jsp").forward(request, response);
50 }
51 if(mark.equals("1")) {
52 String msg="hello world";
53
54
55 //method 1:JS Script，缺点：无法转发setAttritute方法中的键值对
56
57 response.getWriter().write("");
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61 request.getRequestDispatcher("reader_main.jsp").forward(request, response);
62 }else if(mark.equals("2")){
63 request.getRequestDispatcher("admin_main.jsp").forward(request, response);
64 }
65
66 }
67
68 }

1 <%@ page language="java" contentType="text/html; charset=UTF-8"
2 pageEncoding="UTF-8"%>
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管理员登陆成功

11 <%
12 String adminid=(String)request.getAttribute("passname");
13 %>
14 欢迎管理员：<%=adminid %>进入系统！
15

功能选项卡：

16 1、进入图书管理

17 2、进入学生管理

18 3、查看借还列表
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20

1 <%@ page language="java" contentType="text/html; charset=UTF-8"
2 pageEncoding="UTF-8"%>
3
4 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
5 <%@page import ="enity.NewBook" import="java.util.*"%>
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用户登陆成功

33 <%
34 String readerid=(String)request.getAttribute("passname");
35 %>
36 欢迎用户：<%=readerid%>进入系统！

37

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46
47 <c:forEach items="${list}" var="book">
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58 </c:forEach>
59
60 <c:forEach items="${booknamelist}" var="book">
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71 </c:forEach>
72
73 <c:forEach items="${bookauthorlist}" var="book">
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84 </c:forEach>
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图书编号	图书名称	图书作者	图书出版社	图书可借阅数
${book.bookid}	${book.bookname}	${book.bookauthor}	${book.pressname}	${book.availablenum}	55 借阅 56
${book.bookid}	${book.bookname}	${book.bookauthor}	${book.pressname}	${book.availablenum}	68 借阅 69
${book.bookid}	${book.bookname}	${book.bookauthor}	${book.pressname}	${book.availablenum}	81 借阅 82

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100 <c:forEach items="${borrowlist}" var="book">
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115 </c:forEach>
116

借阅列表

图书编号	图书名称	图书作者	图书出版社	图书借阅数	图书可借阅天数
${book.bookid}	${book.bookname}	${book.bookauthor}	${book.pressname}	${book.borrownum}	${book.availabledate}	109 借阅 110	112 归还 113

117

功能选项卡：

118 1、
119 <a
120 href="${pageContext.request.contextPath}/StudentServlet?method=selectAllbooks">查看所有图书列表
121

122 2、
123 <a
124 href="${pageContext.request.contextPath}/StudentServlet?method=selectAllborrowbooks">查看借阅图书列表
125

126
3、查询选项
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129
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131 <form
132 action="${pageContext.request.contextPath}/StudentServlet?method=findbybookname"
133 method="post" onsubmit='return checkbook()'>
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143 <form
144 action="${pageContext.request.contextPath}/StudentServlet?method=findbybookauthor"
145 method="post" onsubmit='return checkauthor()'>
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