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注册模块前端的处理及检查用户的唯一性
用户名和密码为空,不允许注册
用户重复,给出提示,不允许注册
否则可以注册
需要用jQuery,因为jQuery跨浏览器,兼容性好。
用户注册页面(register.jsp)验证:
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 <script type="text/javascript" src="resources/js/lib/jquery.min.js"></script> 9 <script type="text/javascript"> 10 $(function(){ 11 $("[name=‘userName‘]").blur(function(){ 12 if($.trim($(this).val()) == ""){ 13 return; 14 } 15 $.post("checkExists.do",{userName:$(this).val(),pwd:""},function(data){ 16 //已经存在:1,不存在:0 17 $("[name=‘isExists‘]").val(data); 18 if(data == "1"){ 19 $("#msg").html("该用户名已经注册,请重新输入用户名!"); 20 } 21 }); 22 }); 23 $("[type=‘submit‘]").click(function(){ 24 if($.trim($("[name=‘userName‘]").val()) == ""){ 25 $("#msg").html("用户名不能为空,请重新输入用户名!"); 26 return false; 27 } 28 if($("[name=‘isExists‘]").val() == "1"){ 29 $("#msg").html("该用户名已经注册,请重新输入!"); 30 return false; 31 } 32 if($.trim($("[name=‘pwd‘]").val()) == ""){ 33 $("#msg").html("密码不能为空,请输入密码!"); 34 return false; 35 } 36 return true; 37 }); 38 }); 39 </script> 40 </head> 41 <body> 42 用户注册<br/> 43 44 <form method="post" action="addUser.do"> 45 <table> 46 <tr> 47 <td>用户名:</td> 48 <td><input type="text" name="userName"/></td> 49 </tr> 50 <tr> 51 <td>密码:</td> 52 <td><input type="password" name="pwd"/></td> 53 </tr> 54 <tr> 55 <td colspan="2"> 56 <input type="submit" value="提 交"/> 57 </td> 58 </tr> 59 </table> 60 <input type="hidden" name="isExists" value="0"/> 61 </form> 62 <div id="msg"></div> 63 <br/> 64 <br/> 65 <a href="main.jsp">返回主页面</a> 66 </body> 67 </html>
DAO 验证用户代码:
1 /** 2 * 检查用户是否存在 3 * @param user 4 * @return 5 */ 6 public boolean checkExists(User user){ 7 boolean rel = false; 8 String sql = "select id,username,pwd from users where username = ?"; 9 Connection conn = DBLib.getConn(); 10 PreparedStatement pstmt; 11 try { 12 pstmt = conn.prepareStatement(sql); 13 pstmt.setString(1, user.getUserName()); 14 ResultSet set = pstmt.executeQuery(); 15 if(set.next()){ 16 rel = true; 17 } 18 set.close(); 19 pstmt.close(); 20 } catch (SQLException e) { 21 e.printStackTrace(); 22 } finally{ 23 try { 24 conn.close(); 25 } catch (SQLException e) { 26 e.printStackTrace(); 27 } 28 } 29 return rel; 30 }
CheckExistsAction(一定要继承Action类):
1 package action; 2 3 import javax.servlet.http.HttpServletRequest; 4 import javax.servlet.http.HttpServletResponse; 5 6 import org.apache.struts.action.Action; 7 import org.apache.struts.action.ActionForm; 8 import org.apache.struts.action.ActionForward; 9 import org.apache.struts.action.ActionMapping; 10 11 import dao.UserDAO; 12 import myuser.User; 13 14 public class CheckExistsAction extends Action { 15 16 public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, 17 HttpServletResponse response) throws Exception { 18 User user = (User)form; 19 UserDAO dao = new UserDAO(); 20 String rel = dao.checkExists(user) ? "1" : "0"; 21 response.getWriter().write(rel); 22 return null; 23 } 24 25 }
struts-config.xml配置:
1 <action path="/checkExists" type="action.CheckExistsAction" name="user"/>
源代码链接:http://pan.baidu.com/s/1hrJISV6 提取码:fjxk
注册模块前端的处理及检查用户的唯一性
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