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Servlet作业1-实现注册登录

1,注册功能

注册页面zhuce.html

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 2 <html>
 3 <head>
 4 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 5 <title>注册页面</title>
 6 
 7 <script type="text/javascript">
 8 //js方法,验证用户名,昵称,密码是否为空,两次密码输入是否一致
 9 function yanzh()
10 {
11     if(form1.user.value == "")
12         {
13         alert("用户名不能为空");
14         return false
15         }
16     else if(form1.passw.value == "")
17         {
18         alert("密码不能为空");
19         return false
20         }
21     else if(form1.nich.value == "")
22         {
23         alert("昵称不能为空");
24         return false
25         }
26     else if(form1.passw.value != form1.passw1.value)
27         {
28         alert("两次输入密码不一致");
29         return false
30         }
31     else
32         {
33         return true
34         }
35         
36 }
37 
38 </script>
39 
40 </head>
41 <body>
42 <!-- 注册表单 -->
43 <form action="Zhcchl" name="form1" id="form1" onsubmit="return yanzh()" method="post">
44 
45 请注册
46 <br>
47 用户名:<input type="text" name="user" id="user">
48 <br>
49 昵称:<input type="text" name="nich" id="nich">
50 <br>
51 密码:<input type="password" name="passw" id="passw">
52 <br>
53 确认密码:<input type="password" name="passw1" id="passw1">
54 <br>
55 <input type="submit" value="注册">
56 
57 </form>
58 
59 </body>
60 </html>

注册处理Servlet: Zhcchl.java

  1 package com.hanqi;
  2 
  3 import java.io.IOException;
  4 
  5 import javax.servlet.ServletContext;
  6 import javax.servlet.ServletException;
  7 
  8 import javax.servlet.http.HttpServlet;
  9 import javax.servlet.http.HttpServletRequest;
 10 import javax.servlet.http.HttpServletResponse;
 11 import com.hanqi.*;
 12 
 13 /**
 14  * Servlet implementation class Zhcchl
 15  */
 16 public class Zhcchl extends HttpServlet {
 17     private static final long serialVersionUID = 1L;
 18     
 19      
 20     /**
 21      * @see HttpServlet#HttpServlet()
 22      */
 23     public Zhcchl() {
 24         super();
 25         // TODO Auto-generated constructor stub
 26     }
 27 
 28     /**
 29      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
 30      */
 31     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 32         //解决中文乱码
 33         response.setCharacterEncoding("GBK");
 34         //request.setCharacterEncoding("GBK");
 35         //response.setContentType("text/html;charset=GBK");
 36         
 37         // 接收表单提交信息        
 38         String user = request.getParameter("user");
 39         String nich = request.getParameter("nich");
 40         String passw = request.getParameter("passw");
 41         
 42         
 43         
 44         
 45         //判断接收信息合法性
 46         if(user == null || user.trim().length() == 0)
 47         {
 48             response.getWriter().append("用户名不能为空");
 49             response.setHeader("refresh", "3;URL=zhuce.html");
 50         }
 51         else if(nich == null || nich.trim().length() == 0)
 52         {
 53             response.getWriter().append("昵称不能为空");
 54             response.setHeader("refresh", "3;URL=zhuce.html");
 55         }
 56         else if(passw == null || passw.trim().length() == 0)
 57         {
 58             response.getWriter().append("密码不能为空");
 59             response.setHeader("refresh", "3;URL=zhuce.html");
 60         }
 61         else
 62         {
 63             ServletContext application = this.getServletContext();
 64                 
 65             if(application.getAttribute(user) != null)
 66             {
 67                 response.getWriter().append("用户已存在");
 68                 response.setHeader("refresh", "3;URL=zhuce.html");
 69 
 70             }
 71             else
 72             {
 73                 //实例化Zhcxx类
 74                 Zhcxx zc = new Zhcxx();
 75                 //将信息存入zc对象
 76                 zc.setUser(user);
 77                 zc.setNich(nich);
 78                 zc.setPassw(passw);
 79                 
 80                 //将用户注册信息写入application
 81                 
 82                 application.setAttribute(user, zc);
 83                 
 84                 response.getWriter().append("注册成功");
 85                 
 86                 response.setHeader("refresh", "3;URL=index.html");
 87             }
 88         }
 89         //response.getWriter().append("Served at: ").append(request.getContextPath());
 90     }
 91 
 92     /**
 93      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 94      */
 95     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 96         // TODO Auto-generated method stub
 97         doGet(request, response);
 98     }
 99 
100 }

自定义存储用户注册信息的类:Zhcxx.java

 1 package com.hanqi;
 2 
 3 public class Zhcxx {
 4     
 5     private String user;
 6 
 7     public String getUser() {
 8         return user;
 9     }
10 
11     public void setUser(String user) {
12         this.user = user;
13     }
14     
15     private String nich;
16     public String getNich() {
17         return nich;
18     }
19 
20     public void setNich(String nich) {
21         this.nich = nich;
22     }
23 
24     private String passw;
25     public String getPassw() {
26         return passw;
27     }
28 
29     public void setPassw(String passw) {
30         this.passw = passw;
31     }
32 
33     
34 
35 }

2登录功能

登录页面index.html

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 2 <html>
 3 <head>
 4 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 5 <title>登录页</title>
 6 
 7     <script type="text/javascript">
 8     
 9     //js方法验证用户名密码是否为空
10     function yanzh()
11     {
12         if(form1.user.value == "")
13             {
14             alert("用户名不能为空");
15             return false;
16             }
17         else if(form1.password.value == "")
18             {
19             alert("密码不能为空");
20             return false;
21             }
22         else
23             {
24             return true;
25             }
26     }
27     </script>
28 
29 </head>
30 <body>
31 
32 <!-- 登录表单 -->
33 <form action="Logac" name="form1" id="from1" onsubmit="return yanzh()" method="post">
34 
35     请登录
36     <br>
37     用户名:<input type="text" name="user" id="user">
38     <br>
39     密码:<input type="password" name="password" id="password">
40     <br>
41     <input type="submit" value="登录">
42     <a href="zhuce.html">注册</a>
43 </form>
44 
45 </body>
46 </html>

登录处理Servlet:logac.java

 1 package com.hanqi;
 2 
 3 import java.io.IOException;
 4 
 5 import javax.servlet.ServletContext;
 6 import javax.servlet.ServletException;
 7 import javax.servlet.http.HttpServlet;
 8 import javax.servlet.http.HttpServletRequest;
 9 import javax.servlet.http.HttpServletResponse;
10 
11 /**
12  * Servlet implementation class Logac
13  */
14 public class Logac extends HttpServlet {
15     private static final long serialVersionUID = 1L;
16        
17     /**
18      * @see HttpServlet#HttpServlet()
19      */
20     public Logac() {
21         super();
22         // TODO Auto-generated constructor stub
23     }
24 
25     /**
26      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
27      */
28     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
29         // 指定中文字符集
30         response.setCharacterEncoding("GBK");
31         //request.setCharacterEncoding("GBK");
32         //response.setContentType("text/html;charset=GBK");
33         //接收表单信息
34         String user = request.getParameter("user");
35         
36         String passw = request.getParameter("password");
37         
38         //判断获取信息合法性
39         if(user == null || user.trim().length() == 0)
40         {
41             response.getWriter().append("用户名非法");
42             response.setHeader("refresh", "3;URL=index.html");
43         }
44         else if(passw == null || passw.trim().length() == 0)
45         {
46             response.getWriter().append("密码非法");
47             response.setHeader("refresh", "3;URL=index.html");
48         }
49         else
50         {
51             //创建application对象
52             ServletContext application = this.getServletContext();
53             //取出以user为名存储的对象
54             Object obj = application.getAttribute(user);
55             //如果对象不存在说明用户名不存在
56             if(obj == null)
57             {
58                 response.getWriter().append("用户名不存在");
59                 response.setHeader("refresh", "3;URL=index.html");
60             }
61             else
62             {
63                 //实例化Zhcxx
64                 Zhcxx zhc = (Zhcxx)obj;
65                 //从zhc对象取出密码,昵称
66                 String ipsw = zhc.getPassw();
67                 String inch = new String(zhc.getNich().getBytes("ISO-8859-1"),"UTF-8");
68                 //判断密码是否正确
69                 if(passw.trim().equals(ipsw.trim()))
70                 {
71                     response.getWriter().println("欢迎" + inch +"登录");
72                 }
73                 else
74                 {
75                     response.getWriter().println("密码错误");
76 　　　　　　　　　　　 response.setHeader("refresh", "3;URL=index.html");
77                 }
78             }
79         }
80         
81         //response.getWriter().append("Served at: ").append(request.getContextPath());
82     }
83 
84     /**
85      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
86      */
87     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
88         // TODO Auto-generated method stub
89         doGet(request, response);
90     }
91 
92 }

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原文地址：https://www.cnblogs.com/dirgo/p/5013275.html