zoukankan html css js c++ java

java/jsp: 登录系统

db类

  1 package db;
  2 import java.sql.*;
  3 
  4 import javax.naming.InitialContext;
  5 import javax.sql.DataSource;
  6 
  7 
  8 
  9 public class DBConnect {
 10 
 11     private Connection conn;
 12     private Statement stmt;
 13     private PreparedStatement pstmt;
 14     private ResultSet rst;
 15     private String str1;
 16     
 17     private void init()
 18     {
 19         try {
 20             InitialContext ctx = new InitialContext();
 21             DataSource dsSource = (DataSource) ctx.lookup("java:comp/env/jdbc/test");
 22             conn = dsSource.getConnection();
 23             
 24         } catch (Exception e) {
 25             // TODO Auto-generated catch block
 26             e.printStackTrace();
 27         }
 28         
 29     }
 30     
 31     public DBConnect()
 32     {
 33         //构造函数        
 34         try {
 35             //获得一个数据库连接
 36             
 37                 init();
 38                     
 39             stmt = conn.createStatement();
 40             
 41         } catch (Exception e) {
 42             // TODO Auto-generated catch block
 43             e.printStackTrace();
 44         }
 45     }
 46     
 47     //执行数据库查询语句，string s为sql语句
 48     public void excuteQuery(String s)
 49     {
 50         
 51         try {
 52             if(stmt != null)
 53             {
 54                rst = stmt.executeQuery(s);
 55             }
 56         } catch (SQLException e) {
 57             // TODO Auto-generated catch block
 58             e.printStackTrace();
 59         }
 60         
 61     }
 62     
 63     //对数据库执行update操作
 64     public int excuteUpdate(String s)
 65     {
 66         int status = 0;
 67         try {
 68             if(stmt != null)            
 69                 status = stmt.executeUpdate(s);
 70         } catch (SQLException e) {
 71             // TODO Auto-generated catch block
 72             e.printStackTrace();
 73         }
 74         
 75         return status;
 76     }
 77     
 78     
 79     //以下为赋值方法
 80     //字符串赋值
 81     public void setString(int i, String s)
 82     {
 83         try {
 84             pstmt.setString(i, s);
 85         } catch (Exception e) {
 86             // TODO Auto-generated catch block
 87             e.printStackTrace();
 88         }
 89     }
 90     
 91     //boolean赋值
 92     public void setBoolean(int i, Boolean flag)
 93     {
 94         try {
 95             pstmt.setBoolean(i, flag);
 96         } catch (SQLException e) {
 97             // TODO Auto-generated catch block
 98             e.printStackTrace();
 99         }
100     }
101     
102     
103     //date日期型赋值
104     public void setDate(int i, Date date) {
105         try {
106             pstmt.setDate(i, date);
107         } catch (SQLException e) {
108             // TODO Auto-generated catch block
109             e.printStackTrace();
110         }
111     }
112     
113     
114     //时间类型赋值
115     public void setTime(int i, Time time) {
116         try {
117             pstmt.setTime(i, time);
118         } catch (SQLException e) {
119             // TODO Auto-generated catch block
120             e.printStackTrace();
121         }
122     }
123     
124     
125     //short类型赋值
126     public void setShort(int i, Short short1)
127     {
128         try {
129             pstmt.setShort(i, short1);
130         } catch (SQLException e) {
131             // TODO Auto-generated catch block
132             e.printStackTrace();
133         }
134     }
135     
136     //整形赋值
137     public void setInt(int i, int int1)
138     {
139         try {
140             pstmt.setInt(i, int1);
141         } catch (SQLException e) {
142             // TODO Auto-generated catch block
143             e.printStackTrace();
144         }
145     }
146     
147     //长整型赋值
148     public void setLong(int i, long l)
149     {
150         try {
151             pstmt.setLong(i, l);
152         } catch (SQLException e) {
153             // TODO Auto-generated catch block
154             e.printStackTrace();
155         }
156     }
157     
158     //浮点型赋值
159     public void setFloat(int i, float f)
160     {
161         try {
162             pstmt.setFloat(i, f);
163         } catch (SQLException e) {
164             // TODO Auto-generated catch block
165             e.printStackTrace();
166         }
167     }
168     
169     
170     
171     //double类型赋值
172     public void setDouble(int i, double d)
173     {
174         try {
175             pstmt.setDouble(i, d);
176         } catch (SQLException e) {
177             // TODO Auto-generated catch block
178             e.printStackTrace();
179         }
180     }
181     
182     
183     
184     
185     //以下为获取的方法
186     //获取字符串
187     public String getString(int i) throws SQLException
188     {
189 
190         return rst.getString(i);
191     }
192     public String getString(String str1) throws SQLException
193     {
194         return rst.getString(str1);
195     }
196     
197     //取得boolean类型
198     public boolean getBoolean(int i) throws SQLException
199     {
200         return rst.getBoolean(i);
201     }
202     public boolean getBoolean(String str1) throws SQLException
203     {
204         return rst.getBoolean(str1);
205     }
206     
207     
208     //取得date日期型
209     public Date getDate(int i) throws SQLException
210     {
211         return rst.getDate(i);
212     }
213     
214     //取得日期字符型
215     public Date getDate(String str1) throws SQLException{
216         return rst.getDate(str1);
217     }
218     
219     //获取time时间
220     public Time getTime(int i) throws SQLException{
221         return rst.getTime(i);
222     }
223     
224     //获取time字符时间
225     public Time geTime(String str1) throws SQLException
226     {
227         return rst.getTime(str1);
228     }
229     
230     //获取双精度型
231     public double getDouble(int i) throws SQLException
232     {
233         return rst.getDouble(i);
234     }
235     public double getDouble(String str1) throws SQLException
236     {
237         return rst.getDouble(str1);
238     }
239     
240     
241     //获取浮点型
242     public float getFloat(int i) throws SQLException{
243         return rst.getFloat(i);
244     }
245     public float getFloat(String str1) throws SQLException
246     {
247         return rst.getFloat(str1);
248     }
249     
250     
251     //获取int型
252     public int getInt(int i) throws SQLException
253     {
254         return rst.getInt(i);
255     }
256     public int getInt(String str1) throws SQLException
257     {
258         return rst.getInt(str1);
259         
260     }
261     
262     //获取长整型
263     public long getLong(int i) throws SQLException
264     {
265         return rst.getLong(i);
266     }
267     public long getLong(String str1) throws SQLException
268     {
269         return rst.getLong(str1);
270     }
271     
272     //获取short短整型
273     public short getShort(int i) throws SQLException
274     {
275         return rst.getShort(i);
276     }
277     public short getShort(String str1) throws SQLException
278     {
279         return rst.getShort(str1);
280     }
281     
282     
283     //指针下移一位
284     public boolean next()
285     {
286         try {
287             return rst.next();
288         } catch (SQLException e) {
289             // TODO Auto-generated catch block
290             e.printStackTrace();
291             return false;
292         }
293     }
294     
295     
296     //释放内存
297     public void close()
298     {
299         
300         
301             try {
302                 if(conn != null)
303                     conn.close();
304                 if(stmt != null)
305                     stmt.close();
306                 if(rst!=null)
307                     rst.close();
308             } catch (SQLException e) {
309                 // TODO Auto-generated catch block
310                 e.printStackTrace();
311             }
312         
313     }
314 }

View Code

register包下的内容：

package register;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Date;

public class DateFormat {

	public static long getDate(String s)
	{
		SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
		ParsePosition parsePosition = new ParsePosition(0);
		Date date = simpleDateFormat.parse(s, parsePosition);
		return date.getTime();
		
	}
	
}

 1 package register;
 2 import register.product.Product;
 3 import register.product.SqlProduct;
 4 import register.user.SqlUser;
 5 import register.user.User;
 6 
 7 public abstract class Factory {
 8 
 9     private static Factory factory = null;
10     public Factory(){}
11     public static Factory getInstance()
12     {
13         if(factory == null)
14         {
15             try {
16                 Class factoryClass = Class.forName("register.SqlFactory");
17                 factory = (Factory) factoryClass.newInstance();
18             } catch (Exception e) {
19                 // TODO Auto-generated catch block
20                 e.printStackTrace();
21             }
22             
23             
24         }
25         
26         return factory;
27     }
28     
29     public abstract User initUser();
30     public abstract SqlUser initSqlUser();
31     public abstract Product initProduct();
32     public abstract SqlProduct initSqlProduct();
33     
34 }

View Code

 1 package register;
 2 import register.product.Product;
 3 import register.product.SqlProduct;
 4 import register.user.SqlUser;
 5 import register.user.User;;
 6 
 7 public class SqlFactory extends Factory{
 8 
 9     public User initUser(){
10         return new SqlUser();
11     }
12     
13     public Product initProduct()
14     {
15         return  new SqlProduct();
16     }
17     
18     public SqlUser initSqlUser()
19     {
20         return new SqlUser();
21     }
22     
23     public SqlProduct initSqlProduct()
24     {
25         return new SqlProduct();
26     }
27 }

View Code

 1 package register.user;
 2 
 3 public interface User {
 4   public abstract void setUser_id(String user_id);
 5   public abstract String getUser_id();
 6   public abstract void setPassword(String password);
 7   public abstract String getPassword();
 8   public abstract void setName(String name);
 9   public abstract String getName();
10   public abstract void setSex(String sex);
11   public abstract String getSex();
12   public abstract void setBirth(long birth);
13   public abstract long getBirth();
14   public abstract void setDescription(String deString);
15   public abstract String getDescription();
16   
17 }

View Code

abstractUser.java

 1 package register.user;
 2 
 3 public abstract class AbstractUser implements User {
 4 
 5     private String user_id;
 6     private String password;
 7     private String name;
 8     private String sex;
 9     private long birth;
10     private String description;
11     
12     
13     public void setUser_id(String user_id)
14     {
15         this.user_id = user_id;
16     }
17     
18     public String getUser_id()
19     {
20         return this.user_id;
21     }
22     
23     public void setPassword(String password)
24     {
25         this.password = password;
26     }
27     
28     public String getPassword()
29     {
30         return this.password;
31     }
32     
33     public void setName(String name)
34     {
35         this.name = name;
36     }
37     
38     public String getName()
39     {
40         return this.name;
41     }
42     
43     public void setSex(String sex)
44     {
45         this.sex = sex;
46     }
47     
48     public String getSex()
49     {
50         return this.sex;
51     }
52     
53     public void setBirth(long birth)
54     {
55         this.birth = birth;
56     }
57     
58     public long getBirth()
59     {
60         return this.birth;
61     }
62     
63     public void setDescription(String description)
64     {
65         this.description = description;
66     }
67     
68     public String getDescription()
69     {
70         return this.description;
71     }
72     
73 }

View Code

sqlUser.java

 1 package register.user;
 2 import register.Factory;
 3 import db.DBConnect;
 4 
 5 public class SqlUser extends AbstractUser 
 6 {
 7     
 8     
 9     public boolean checkRPwd(String password, String rpassword)
10     {
11         if( password != null && rpassword != null )
12         {
13             if( password.equals(rpassword) )
14             {
15                 return true;
16             }else{
17                 return false;
18             }
19         }else{
20             return false;
21         }
22     }
23     
24     public boolean saveUser(User user)
25     {
26         String User_id = user.getUser_id();
27         String Password = user.getPassword();
28         String Name = user.getName();
29         String Sex = user.getSex();
30         long Birth = user.getBirth();
31         String Description = user.getDescription();
32         String str = "insert into users values('" + User_id +"', '"+ Password +"', '"+ Name +"', '"+ Sex +"', " +
33                 "'"+ Birth +"', '"+ Description +"')";
34         
35         try{
36             DBConnect dbcon = new DBConnect();
37             dbcon.excuteUpdate(str);
38             return true;
39         }catch(Exception e)
40         {
41             e.printStackTrace();
42             return false;
43         }
44     }
45     
46     
47     
48     public User getUser(String ID)
49     {
50         User user = Factory.getInstance().initUser();
51         String str = "select * from users where USER_ID = '"+ID+"'";
52         
53         try{
54             DBConnect dbConnect = new DBConnect();
55             dbConnect.excuteQuery(str);
56             if(dbConnect.next())
57             {
58             
59         
60                 user.setUser_id(dbConnect.getString(1));    
61                 user.setPassword(dbConnect.getString(2));
62                 user.setName(dbConnect.getString(3));
63                 user.setSex(dbConnect.getString(4));
64                 user.setBirth(dbConnect.getLong(5));
65                 user.setDescription(dbConnect.getString(6));        
66                 
67                 
68             }
69         }catch(Exception e)
70         {
71             e.printStackTrace();
72         }
73         
74         return user;
75     }
76 
77     public int checkUser(String ID, String password)
78     {
79         int index = -1;
80         User user = getUser(ID);
81         if(user != null)
82         {
83             if( user.getPassword().equals(password) )
84             {
85                 index = 0;
86             }else{
87                 index = 2;
88             }
89         }else{
90             index = 1;
91         }
92         return index;
93     }
94     
95 }

View Code

jsp文件

index

 1 <%@ page contentType="text/html; charset=utf-8" %>
 2 <%@page import="java.util.Iterator"%>
 3 <%@ page import="register.product.SqlProduct" %>
 4 <%@ page import="register.product.Product" %>
 5 <%@ page import="register.Factory" %>
 6 
 7 <html>
 8 <title>登录系统</title>
 9 <body>
10 <h2>Hello World!</h2>
11 
12 <%
13 String user_id = (String)session.getAttribute("user_id");
14 if(user_id == "" || user_id == null)
15 {
16     response.sendRedirect("login.jsp");
17 }
18 
19 
20 
21 Product product = null;
22 SqlProduct sqlProduct = Factory.getInstance().initSqlProduct();
23 Iterator iterator = sqlProduct.getProduct();
24 
25 String product_name = "";
26 float price;
27 String description = "";
28 %>
29 <table>
30     <tr>
31         <td>用户登录系统</td>
32         <td>
33         <%
34         if("".equals(user_id))
35             {
36         %>
37         <a href="login.jsp">登录</a>，
38         <a  href="register.jsp">注销</a>
39         <%
40             }else{
41                 
42         %>
43         <%=user_id %>你好，<a href="logout.jsp">退出</a>
44         <%    
45             }
46         %>
47         
48         
49         </td>
50     </tr>
51     <%
52     while( iterator.hasNext() )
53     {
54         product = (Product)iterator.next();
55         product_name = product.getProduct_name();
56         price = product.getPrice();
57         description = product.getDescription();
58     %>
59     <tr>
60         <td>产品名称:<%=product_name %></td>
61         <td>价格:<%=price %></td>
62     </tr>
63     <tr>
64         <td cospan="2">说明:<%=description %></td>
65     </tr>
66     <% }
67     %>
68 
69 </table>
70 </body>
71 </html>

View Code

 1 <%@ page language="java" contentType="text/html; charset=utf-8"%>
 2 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 3 <html>
 4 <head>
 5 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 6 <title>login</title>
 7 </head>
 8 <body>
 9 
10 <form action="do_login.jsp" method="post">
11 <table>
12     <tr>
13         <td colspan="2" align="center">登录</td>
14     </tr>
15     <%
16     String info = request.getParameter("info");
17     String errMsg = "";
18     if("1".equals(info))
19     {
20         errMsg = "用户名错误";
21     }else if("2".equals(info))
22     {
23         errMsg = "密码错误";
24     }
25     if( !"".equals(errMsg))
26     {
27     %>    
28         <tr>
29         <td colspan="2" align="center" color="red"><%=errMsg %></td>
30     </tr>
31     <%
32     }
33     %>
34     <tr>
35         <td>用户名</td>
36         <td><input type="text" name="user_id"></td>
37     </tr>
38     <tr>
39         <td>密码</td>
40         <td><input type="password" name="passwd"></td>
41     </tr>
42     <tr>
43         <td colspan="2" align="center"><input type="submit" value="登录"></td>
44     </tr>
45     
46     <tr>
47         <td colspan="2" align="right">
48         <a href="register.jsp">注册</a>
49         </td>
50     </tr>
51 </table>
52 </form>
53 
54 
55 </body>
56 </html>

View Code

do_login.jsp

 1 <%@ page import="register.user.User"%>
 2 <%@ page import="register.user.SqlUser"%>
 3 <%@ page import="register.Factory"%>
 4 <%
 5 String user_id = request.getParameter("user_id");
 6 String passwd = request.getParameter("passwd");
 7 
 8 SqlUser sqlUser = Factory.getInstance().initSqlUser();
 9 int index = sqlUser.checkUser(user_id, passwd);
10 if( index != -1 )
11 {
12     if(index == 1)
13     {
14         response.sendRedirect("login.jsp?info=1");
15     }else if(index == 2)
16     {
17         response.sendRedirect("login.jsp?info=2");
18     }else{
19         session.setAttribute("user_id", user_id);
20         response.sendRedirect("index.jsp");
21     }
22 }else{
23     response.sendRedirect("login.jsp");
24 }
25 %>

View Code

 1 <%@ page language="java" contentType="text/html; charset=utf-8"%>
 2 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 3 <html>
 4 <head>
 5 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 6 <title>register</title>
 7 </head>
 8 <body>
 9 
10 <form action="do_register.jsp" method="post">
11 <table>
12 
13     <tr>
14         <td colspan="2" align="center">注册</td>
15     </tr>
16     <tr>
17         <td>用户名</td>
18         <td><input type="text" name="user_id"></td>
19     </tr>
20     <tr>
21         <td>姓名</td>
22         <td><input type="text" name="name"></td>
23     </tr>
24     <tr>
25         <td>密码</td>
26         <td><input type="password" name="passwd"></td>
27     </tr>
28     <tr>
29         <td>确认密码</td>
30         <td><input type="password" name="rpasswd"></td>
31     </tr>
32     <tr>
33         <td>性别</td>
34         <td>
35             <input type="radio" value="1" name="sex">男
36             <input type="radio" value="2" name="sex">女
37         </td>
38     </tr>
39     <tr>
40         <td>生日</td>
41         <td>
42             年
43             <select name="year">
44             <%
45             int i=0;
46             for(i=1970; i < 2017; i++)
47             {
48             %>            
49                 <option value="<%=i%>"><%=i %></option>
50                 <%
51             }
52             %>
53             </select>
54             
55             月
56             <select name="month">
57             <%            
58             for(i=1; i < 13; i++)
59             {
60             %>
61                 <option value="<%=i %>"><%=i %></option>
62                 <%
63             }
64                 %>
65             </select>
66             日
67             <select name="day">
68             <%            
69             for(i=1; i < 32; i++)
70             {
71             %>
72                 <option value="<%=i%>"><%=i%></option>
73                     <%
74             }
75                 %>
76             </select>
77         </td>
78     </tr>
79     <tr>
80         <td>自我介绍</td>
81         <td><input type="text" name="description"></td>
82     </tr>
83     <tr>
84         <td colspan="2"><input type="submit" value="注册"></td>
85     </tr>
86     <tr>
87         <td colspan="2" align="right"><a href="login.jsp">登录</a></td>
88     </tr>
89     
90 </table>
91 </form>
92 
93 
94 
95 </body>
96 </html>

View Code

do_register.jsp

 1 <%@ page import="register.DateFormat"%>
 2 <%@ page import="register.user.User"%>
 3 <%@ page import="register.user.SqlUser"%>
 4 <%@ page import="register.Factory"%>
 5 <%
 6 //获取传递过来的参数
 7 String user_id = request.getParameter("user_id");
 8 String passwd = request.getParameter("passwd");
 9 String rpasswd = request.getParameter("rpasswd");
10 String sex = request.getParameter("sex");
11 String name = request.getParameter("name");
12 
13 String year = request.getParameter("year");
14 String month = request.getParameter("month");
15 if(month.length() ==1)month = "0"+month;
16 String day = request.getParameter("day");
17 if(day.length() ==1)day = "0"+day;
18 String date = year+"-"+month+"-"+day;
19 
20 String description = request.getParameter("description");
21 
22 
23 //初始化user实例
24 User user = Factory.getInstance().initUser();
25 //初始化sqlUser实例
26 SqlUser sqlUser = Factory.getInstance().initSqlUser();
27 
28 
29 //将日期转为Long型
30 long birth = DateFormat.getDate(date);
31 if( sqlUser.checkRPwd(passwd, rpasswd) )
32 {
33     
34     user.setUser_id(user_id);
35     user.setPassword(passwd);
36     user.setName(name);
37     user.setSex(sex);
38     user.setBirth(birth);
39     user.setDescription(description);
40     
41     
42     if(sqlUser.saveUser(user))
43     {
44         session.setAttribute("user_id", user_id);
45         response.sendRedirect("index.jsp");
46         
47     }else{
48         response.sendRedirect("register.jsp");
49     }
50     
51     
52 }else{
53     response.sendRedirect("register.jsp");
54 }
55 
56 
57 
58 %>

View Code

logout.jsp

<%
session.removeAttribute("user_id");
response.sendRedirect("index.jsp");
%>

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原文地址：https://www.cnblogs.com/achengmu/p/8196163.html