javeweb_学生信息添加系统
在text.jsp中画出界面，以及设置提交选项的限制
1 <%@ page language="java" contentType="text/html; charset=UTF-8" 2 pageEncoding="UTF-8"%> 3 <!DOCTYPE html> 4 <html> 5 <head> 6 <meta charset="UTF-8"> 7 <title>当前位置：添加学生信息</title> 8 </head> 9 <body> 10 <% 11 Object message = request.getAttribute("message"); 12 if (message != null && !"".equals(message)) { 13 %> 14 <script type="text/javascript"> 15 alert("<%=request.getAttribute("message")%>"); 16 var asd=request.getAttribute("username"); 17 </script> 18 <% 19 } 20 %> 21 <form action="Servlet?method=add" method="post" onsubmit="return check(this)"> 22 23 <table > 24 <tr> 25 <th>登录账号：</th> 26 <td> 27 28 <input name="username" type="text" /> 29 </td> 30 </tr> 31 <tr> 32 <th>登录密码：</th> 33 <td> 34 <input name="password" type="password" /> 35 </td> 36 </tr> 37 <tr> 38 <th>性别：</th> 39 <td> 40 <select name="sex"> 41 <option>男</option> 42 <option>女</option> 43 </select> 44 </td> 45 </tr> 46 <tr> 47 <th>姓名：</th> 48 <td> 49 <input name="name" type="text"> 50 </td> 51 </tr> 52 <tr> 53 <th>学号：</th> 54 <td> 55 <input name="sno" type="text"> 56 </td> 57 </tr> 58 <tr> 59 <th>电子邮件：</th> 60 <td> 61 <input name="email" type="text"> 62 </td> 63 </tr> 64 <tr> 65 <th>所在学校：</th> 66 <td> 67 <input name="school" type="text"> 68 </td> 69 </tr> 70 <tr> 71 <th>所在系：</th> 72 <td> 73 <input name="college" type="text"> 74 </td> 75 </tr> 76 <tr> 77 <th>所在班级：</th> 78 <td> 79 <input name="class1" type="text"> 80 </td> 81 </tr> 82 <tr> 83 <th>入学年份（届）：</th> 84 <td> 85 <select name="time"> 86 <option>2015</option> 87 <option>2016</option> 88 <option>2017</option> 89 <option>2018</option> 90 <option>2019</option> 91 </select> 92 </td> 93 </tr> 94 95 <tr> 96 <th>生源地：</th> 97 <td> 98 <input name="ofstudents" type="text"> 99 </td> 100 </tr> 101 102 <tr> 103 <th>备注：</th> 104 <td> 105 <input name="remarks" type="text"> 106 </td> 107 </tr> 108 <tr> 109 <td > 110 <input type="submit" value="提交" /> 111 112 </td> 113 </tr> 114 </table> 115 </form> 116 117 118 </body> 119 <script type="text/javascript"> 120 function check(form){ 121 if(form.username.value.length<6 || form.username.value.length>12 || new RegExp("[^a-zA-Z0-9_\u4e00-\u9fa5]").test(form.username.value)){ 122 alert("登陆账号必须由6-12位英文字符或数字组成！"); 123 form.username.focus(); 124 return false; 125 } 126 if(new RegExp("[^a-zA-Z]").test(form.username.value.substring(0,1))){ 127 alert("登陆账号必须以英文字母开头！"); 128 form.username.focus(); 129 return false; 130 } 131 if(form.password.value.length < 8 || new RegExp("[^0-9a-zA-Z]").test(form.password.value)){ 132 alert("密码由八位以上数字或字母组成！"); 133 form.password.focus(); 134 return false; 135 } 136 var re = /^\d{4}/; 137 if(form.sno.value.length != 8 || form.sno.value.match(re)[0]!='2018'){ 138 alert("学号由八位组成，前四位是2018"); 139 form.password.focus(); 140 return false; 141 } 142 //以数字字母开头，中间可以是多个数字字母或下划线；然后是“@”；然后是数字字母；然后是“.”；最后是2-4个字母结尾 143 var regex = /^([a-zA-Z]|[0-9])(\w|\-)+@[a-zA-Z0-9]+\.([a-zA-Z]{2,4})$/; 144 if(!regex.test(form.email.value)){ 145 alert("邮箱格式错误！"); 146 form.email.focus(); 147 return false; 148 } 149 return true; 150 } 151 </script> 152 </html>
创建4个包，在每个包里面创建一个.Java文件，分别是Dao、DBUtil、User、Servlet，用来连接数据库，以及向数据库中添加信息
Dao：
1 package Dao; 2 3 import java.sql.Connection; 4 import java.sql.Statement; 5 6 import DBUtil.DBUtil; 7 8 import Entity.User; 9 10 public class Dao { 11 12 public boolean add(User user) { 13 // TODO Auto-generated method stub 14 String sql = "insert into kao(username,password,sex,name,sno,email,school,college,class1,time,ofstudents,remarks) values('"+ user.getUsername() + "','"+ user.getPassword() +"','"+ user.getSex() +"','" + user.getName() +"','"+ user.getSno() +"','"+ user.getEmail() +"','"+ user.getSchool() +"','"+ user.getCollege() +"','"+ user.getClass1() +"','"+ user.getTime() +"','"+ user.getOfstudents()+"','" +user.getRemarks()+"')"; 15 Connection conn = DBUtil.getConn(); 16 Statement state = null; 17 boolean f = false; 18 int a = 0; 19 20 try { 21 state = conn.createStatement(); 22 a=state.executeUpdate(sql); 23 } catch (Exception e) { 24 e.printStackTrace(); 25 } finally { 26 27 DBUtil.close(state, conn); 28 } 29 30 if (a > 0) { 31 f = true; 32 } 33 return f; 34 35 } 36 }
DBUtil：
1 package DBUtil; 2 3 4 5 import java.sql.Connection; 6 import java.sql.DriverManager; 7 import java.sql.PreparedStatement; 8 import java.sql.ResultSet; 9 import java.sql.SQLException; 10 import java.sql.Statement; 11 12 13 public class DBUtil { 14 15 public static String db_url = "jdbc:mysql://localhost:3306/xinxi"; 16 public static String db_user = "root"; 17 public static String db_pass = "wyp6666"; 18 19 public static Connection getConn () { 20 Connection conn = null; 21 22 try { 23 Class.forName("com.mysql.jdbc.Driver"); 24 conn = DriverManager.getConnection(db_url, db_user, db_pass); 25 } catch (Exception e) { 26 e.printStackTrace(); 27 } 28 29 return conn; 30 } 31 32 public static void close (Statement state, Connection conn) { 33 if (state != null) { 34 try { 35 state.close(); 36 } catch (SQLException e) { 37 e.printStackTrace(); 38 } 39 } 40 41 if (conn != null) { 42 try { 43 conn.close(); 44 } catch (SQLException e) { 45 e.printStackTrace(); 46 } 47 } 48 } 49 50 public static void close (ResultSet rs, Statement state, Connection conn) { 51 if (rs != null) { 52 try { 53 rs.close(); 54 } catch (SQLException e) { 55 e.printStackTrace(); 56 } 57 } 58 59 if (state != null) { 60 try { 61 state.close(); 62 } catch (SQLException e) { 63 e.printStackTrace(); 64 } 65 } 66 67 if (conn != null) { 68 try { 69 conn.close(); 70 } catch (SQLException e) { 71 e.printStackTrace(); 72 } 73 } 74 } 75 76 public static void main(String[] args) throws SQLException { 77 Connection conn = getConn(); 78 PreparedStatement pstmt = null; 79 ResultSet rs = null; 80 String sql ="select * from users"; 81 pstmt = conn.prepareStatement(sql); 82 rs = pstmt.executeQuery(); 83 if(rs.next()){ 84 System.out.println("成攻"); 85 }else{ 86 System.out.println("失败"); 87 } 88 } 89 }
Servlet：
1 package Servlet; 2 import java.io.IOException; 3 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 Dao.Dao; 11 12 import Entity.User; 13 14 15 16 @WebServlet("/Servlet") 17 public class Servlet extends HttpServlet { 18 private static final long serialVersionUID = 1L; 19 20 21 public Servlet() { 22 super(); 23 24 } 25 protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { 26 req.setCharacterEncoding("utf-8"); 27 String method = req.getParameter("method"); 28 if ("add".equals(method)) { 29 add(req, resp); 30 } 31 } 32 33 34 private void add(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{ 35 req.setCharacterEncoding("utf-8"); 36 String username = req.getParameter("username"); 37 String password = req.getParameter("password"); 38 String name = req.getParameter("sex"); 39 String sex = req.getParameter("name"); 40 String sno = req.getParameter("sno"); 41 String email = req.getParameter("email"); 42 String school = req.getParameter("school"); 43 String college = req.getParameter("college"); 44 String class1 = req.getParameter("class1"); 45 String time= req.getParameter("time"); 46 String ofstudents = req.getParameter("ofstudents"); 47 String remarks = req.getParameter("remarks"); 48 User user = new User(username,password,sex,name,sno,email,school,college,class1,time,ofstudents,remarks); 49 50 Dao dao =new Dao(); 51 boolean f=dao.add(user); 52 53 54 if(f) { 55 req.setAttribute("message", "注册成功！"); 56 req.getRequestDispatcher("text.jsp").forward(req,resp); 57 } else { 58 req.setAttribute("message", "注册失败！"); 59 req.getRequestDispatcher("text.jsp").forward(req,resp); 60 } 61 } 62 }
