1 <%@ page language="java" contentType="text/html; charset=UTF-8"
2 pageEncoding="UTF-8"%>
3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
4 <html>
5 <head>
6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
7 <title>系統入口</title>
8 </head>
9 <body>
10 <center>
11 <table align="center"
12 style="background-image: url(); background-repeat: no-repeat"
13 style="楷體" border="1" cellpadding="5" cellspacing="1">
14 <caption>
15 <font size="3" style="" color="green">圖書借閱系統登陸入口</font>
16 </caption>
17 <form action="${pageContext.request.contextPath}/loginservlet"
18 method="post">
19 <tr>
20 <th>使用者名</th>
21 <td align="center"><input type="text" name="passname"><br>
22 </td>
23 </tr>
24 <tr>
25 <th>密碼</th>
26 <td align="center"><input type="password" name="password"><br>
27 </td>
28 </tr>
29 <td><input type="submit" value="登陸"></td>
30 <td><input type="reset" value="清除"></td>
31
32 </form>
33
34 </table>
35 </center>
36 </body>
37 </html> 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，缺點：無法轉發setAttritute方法中的鍵值對
56
57 response.getWriter().write("<script language=javascript>alert('" +msg+ "');window.location='reader_main.jsp'</script>");
58
59
60
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"%>
3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
4 <html>
5 <head>
6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
7 <title>Insert title here</title>
8 </head>
9 <body>
10 <h1>管理者登陸成功</h1>
11 <%
12 String adminid=(String)request.getAttribute("passname");
13 %>
14 歡迎管理者：<%=adminid %>進入系統！
15 <h1>功能頁籤：</h1>
16 1、<a href="${pageContext.request.contextPath}/bookservlet">進入圖書管理</a><br>
17 2、<a href="${pageContext.request.contextPath}/readerservlet">進入學生管理</a><br>
18 3、<a href="${pageContext.request.contextPath }/bookservlet?method=browse">檢視借還清單</a>
19 </body>
20 </html> 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
2 pageEncoding="UTF-8"%>
3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
4 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
5 <%@page import ="enity.NewBook" import="java.util.*"%>
6 <html>
7 <head>
8 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
9 <title>Insert title here</title>
10 <script type="text/javascript">
11
12 function checkbook(){
13 var f1=document.booknamelist;
14 if(f1.size()==0){
15 alert("根據書名，未查詢到結果！");
16 return false;
17 }
18 return true;
19 }
20 function checkauthor(){
21 var f2=document.bookauthorlist;
22 if(f2.size()==0){
23 alert("根據作者名，未查詢到結果！");
24 return false;
25 }
26 return true;
27 }
28 </script>
29 </head>
30 <body>
31
32 <h1>使用者登陸成功</h1>
33 <%
34 String readerid=(String)request.getAttribute("passname");
35 %>
36 歡迎使用者：<%=readerid%>進入系統！<p>
37 <table align="center" border="1" cellpadding="3" cellspacing="1">
38 <tr>
39 <th>圖書編号</th>
40 <th>圖書名稱</th>
41 <th>圖書作者</th>
42 <th>圖書出版社</th>
43 <th>圖書可借閱數</th>
44 </tr>
45 <tr>
46 </tr>
47 <c:forEach items="${list}" var="book">
48 <tr>
49 <td align="center">${book.bookid}</td>
50 <td align="center">${book.bookname}</td>
51 <td align="center">${book.bookauthor}</td>
52 <td align="center">${book.pressname}</td>
53 <td align="center">${book.availablenum}</td>
54 <td>
55 <a href="${pageContext.request.contextPath}/StudentServlet?borrowmethod=borrowbook&bookid=${book.bookid}&method=selectAllbooks">借閱</a>
56 </td>
57 </tr>
58 </c:forEach>
59
60 <c:forEach items="${booknamelist}" var="book">
61 <tr>
62 <td align="center">${book.bookid}</td>
63 <td align="center">${book.bookname}</td>
64 <td align="center">${book.bookauthor}</td>
65 <td align="center">${book.pressname}</td>
66 <td align="center">${book.availablenum}</td>
67 <td>
68 <a href="${pageContext.request.contextPath}/StudentServlet?borrowmethod=borrowbook&bookid=${book.bookid}&method=selectAllbooks">借閱</a>
69 </td>
70 </tr>
71 </c:forEach>
72
73 <c:forEach items="${bookauthorlist}" var="book">
74 <tr>
75 <td align="center">${book.bookid}</td>
76 <td align="center">${book.bookname}</td>
77 <td align="center">${book.bookauthor}</td>
78 <td align="center">${book.pressname}</td>
79 <td align="center">${book.availablenum}</td>
80 <td>
81 <a href="${pageContext.request.contextPath}/StudentServlet?borrowmethod=borrowbook&bookid=${book.bookid}&method=selectAllbooks">借閱</a>
82 </td>
83 </tr>
84 </c:forEach>
85
86 </table>
87
88
89
90 <table align="center" border="1" cellpadding="3" cellspacing="1">
91 <caption>借閱清單</caption>
92 <tr>
93 <th>圖書編号</th>
94 <th>圖書名稱</th>
95 <th>圖書作者</th>
96 <th>圖書出版社</th>
97 <th>圖書借閱數</th>
98 <th>圖書可借閱天數</th>
99 </tr>
100 <c:forEach items="${borrowlist}" var="book">
101 <tr>
102 <td align="center">${book.bookid}</td>
103 <td align="center">${book.bookname}</td>
104 <td align="center">${book.bookauthor}</td>
105 <td align="center">${book.pressname}</td>
106 <td align="center">${book.borrownum}</td>
107 <td align="center">${book.availabledate}</td>
108 <td>
109 <a href="${pageContext.request.contextPath}/StudentServlet?borrowmethod=borrowbook&bookid=${book.bookid}&method=selectAllbooks">借閱</a>
110 </td>
111 <td>
112 <a href="${pageContext.request.contextPath}/StudentServlet?givebackmethod=givebackbook&bookid=${book.bookid}&method=selectAllbooks">歸還</a>
113 </td>
114 </tr>
115 </c:forEach>
116 </table>
117 <h1>功能頁籤：</h1>
118 1、
119 <a
120 href="${pageContext.request.contextPath}/StudentServlet?method=selectAllbooks">檢視所有圖書清單</a>
121 <br>
122 2、
123 <a
124 href="${pageContext.request.contextPath}/StudentServlet?method=selectAllborrowbooks">檢視借閱圖書清單</a>
125 <br>
126 <br>3、查詢選項
127 <br>
128 <br>
129 <table align="left">
130 <caption>①、根據書名查詢：</caption>
131 <form
132 action="${pageContext.request.contextPath}/StudentServlet?method=findbybookname"
133 method="post" onsubmit='return checkbook()'>
134
135 <tr>
136 <td><input type="text" name="bookname" placeholder="請輸入書名"></td>
137 </tr>
138 <td><input type="submit" value="送出" ></td>
139 </form>
140 </table>
141 <table align="left">
142 <caption>②、根據作者查詢：</caption>
143 <form
144 action="${pageContext.request.contextPath}/StudentServlet?method=findbybookauthor"
145 method="post" onsubmit='return checkauthor()'>
146 <tr>
147 <td><input type="text" name="bookauthor" placeholder="請輸入書的作者名"></td>
148 </tr>
149 <td><input type="submit" value="送出" ></td>
150 </form>
151 </table>
152
153 </body>
154 </html> 作者：靠譜楊，
更多日常分享盡在我的VX公衆号：小楊的挨踢IT生活
![Java小案例——随機數猜測随機數猜測[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)