javaweb登陆实例
2021-03-12 12:31
标签：generate orm order else json EDA tle protected ext servlet javaweb登陆实例 标签：generate orm order else json EDA tle protected ext 原文地址：https://www.cnblogs.com/rainbow-1/p/14081450.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 html>
5 head>
6 meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
7 title>系统入口title>
8 head>
9 body>
10 center>
11 table align="center"
12 style="background-image: url(); background-repeat: no-repeat"
13 style="楷体" border="1" cellpadding="5" cellspacing="1">
14 caption>
15 font size="3" style="" color="green">图书借阅系统登陆入口font>
16 caption>
17 form action="${pageContext.request.contextPath}/loginservlet"
18 method="post">
19 tr>
20 th>用户名th>
21 td align="center">input type="text" name="passname">br>
22 td>
23 tr>
24 tr>
25 th>密码th>
26 td align="center">input type="password" name="password">br>
27 td>
28 tr>
29 td>input type="submit" value="登陆">td>
30 td>input type="reset" value="清除">td>
31
32 form>
33
34 table>
35 center>
36 body>
37 html>
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("");
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 heretitle>
8 head>
9 body>
10 h1>管理员登陆成功h1>
11
12 String adminid=(String)request.getAttribute("passname");
13 %>
14 欢迎管理员：=adminid %>进入系统！
15 h1>功能选项卡：h1>
16 1、a href="${pageContext.request.contextPath}/bookservlet">进入图书管理a>br>
17 2、a href="${pageContext.request.contextPath}/readerservlet">进入学生管理a>br>
18 3、a href="${pageContext.request.contextPath }/bookservlet?method=browse">查看借还列表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 heretitle>
10 script type="text/javascript">
11
12 function checkbook(){
13 var f1=document.booknamelist;
14 if(f1.size()==0){
15 alert("根据书名，未查询到结果！");
16 return false;
17 }
18 return true;
19 }
20 function checkauthor(){
21 var f2=document.bookauthorlist;
22 if(f2.size()==0){
23 alert("根据作者名，未查询到结果！");
24 return false;
25 }
26 return true;
27 }
28 script>
29 head>
30 body>
31
32 h1>用户登陆成功h1>
33
34 String readerid=(String)request.getAttribute("passname");
35 %>
36 欢迎用户：=readerid%>进入系统！p>
37 table align="center" border="1" cellpadding="3" cellspacing="1">
38 tr>
39 th>图书编号th>
40 th>图书名称th>
41 th>图书作者th>
42 th>图书出版社th>
43 th>图书可借阅数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">借阅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">借阅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">借阅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>借阅列表caption>
92 tr>
93 th>图书编号th>
94 th>图书名称th>
95 th>图书作者th>
96 th>图书出版社th>
97 th>图书借阅数th>
98 th>图书可借阅天数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=${book.bookid}&method=selectAllbooks">借阅a>
110 td>
111 td>
112 a href="${pageContext.request.contextPath}/StudentServlet?givebackmethod=givebackbook&bookid=${book.bookid}&method=selectAllbooks">归还a>
113 td>
114 tr>
115 c:forEach>
116 table>
117 h1>功能选项卡：h1>
118 1、
119 a
120 href="${pageContext.request.contextPath}/StudentServlet?method=selectAllbooks">查看所有图书列表a>
121 br>
122 2、
123 a
124 href="${pageContext.request.contextPath}/StudentServlet?method=selectAllborrowbooks">查看借阅图书列表a>
125 br>
126 br>3、查询选项
127 br>
128 br>
129 table align="left">
130 caption>①、根据书名查询：caption>
131 form
132 action="${pageContext.request.contextPath}/StudentServlet?method=findbybookname"
133 method="post" onsubmit=‘return checkbook()‘>
134
135 tr>
136 td>input type="text" name="bookname" placeholder="请输入书名">td>
137 tr>
138 td>input type="submit" value="提交" >td>
139 form>
140 table>
141 table align="left">
142 caption>②、根据作者查询：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="请输入书的作者名">td>
148 tr>
149 td>input type="submit" value="提交" >td>
150 form>
151 table>
152
153 body>
154 html>