本文實例為大家分享了AJAX實現(xiàn)注冊驗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)用戶在注冊頁面輸入用戶名并且鼠標(biāo)焦點離開輸入框時，到數(shù)據(jù)表中去驗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實際操作注冊驗證用戶名/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：
運行結(jié)果如下：
以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。
標(biāo)簽：德陽 婁底 邯鄲 衡陽 樂山 海南 內(nèi)江 黔東
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