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AJAX實(shí)現(xiàn)注冊(cè)驗(yàn)證用戶名
瀏覽：201日期：2022-06-11 15:27:16
本文實(shí)例為大家分享了AJAX實(shí)現(xiàn)注冊(cè)驗(yàn)證用戶名的具體代碼，供大家參考，具體內(nèi)容如下
功能說明
當(dāng)用戶在注冊(cè)頁面輸入用戶名并且鼠標(biāo)焦點(diǎn)離開輸入框時(shí)，到數(shù)據(jù)表中去驗(yàn)證該用戶名是否已經(jīng)存在，如果存在提示不可用，否則，提示可用。
接口
public interface UserDao { public User findName(String name);}接口實(shí)現(xiàn)類
import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;public class UserDaoImpl implements UserDao { @Override public User findName(String name) { User user =null; Connection conn = DBHelper.getConn(); String sql = "select * from user where name=?"; try { PreparedStatement ps = conn.prepareStatement(sql); ps.setString(1,name); ResultSet rs = ps.executeQuery(); if (rs.next()){ user = new User(); user.setId(rs.getInt(1)); user.setName(rs.getString(2)); user.setPassword(rs.getString(3)); } } catch (SQLException e) { e.printStackTrace(); } return user; }}servlet
import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;@WebServlet("/findName")public class FindNameServlet extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=utf-8"); String name = request.getParameter("name"); UserDao userDao = new UserDaoImpl(); User name1 = userDao.findName(name); if (name1!=null){ response.getWriter().write("1"); }else { response.getWriter().write("2"); } } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); }}JSP頁面
<%@ page contentType="text/html;charset=UTF-8" language="java" %><html> <head> <title>AJAX實(shí)際操作注冊(cè)驗(yàn)證用戶名</title> <script src="js/jquery-1.8.3.js"></script> </head> <body> <form action="#" method="post"> <script type="text/javascript"> $(function () { $("[name=userName]").blur(function () { $.ajax({ type:"get", url:"findName?name="+$("[name=userName]").val(), dataType:"text", success:function (data) { //alert(data); if (data=="1"){ $("#show").html("用戶已存在！！！") }else { $("#show").html("用戶名可用") } } }) }) }); </script> 賬號(hào)<input type="text" name="userName"><span id="show"></span></br> 密碼<input type="password" name="password"></br> <input type="submit" value="提交"> </form> </body></html>數(shù)據(jù)庫如下：
運(yùn)行結(jié)果如下：
以上就是本文的全部內(nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持。
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