使用AJAX（包含正則表達(dá)式）驗(yàn)證用戶(hù)登錄的步驟
我們來(lái)分一下步驟吧：
1.html代碼，頁(yè)面先寫(xiě)出來(lái)；
2.正則表達(dá)式驗(yàn)證輸入的用戶(hù)名密碼是否正確，失去焦點(diǎn)驗(yàn)證
3.ajax異步提交
4.servlet這是后臺(tái)處理代碼獲取數(shù)據(jù)并對(duì)比響應(yīng)，然后跳轉(zhuǎn)成功頁(yè)面
效果圖：
結(jié)構(gòu)：
代碼如下：
<%@ page language="java" import="java.util.*" pageencoding="utf-8"%>
<!doctype html public "-//w3c//dtd html 4.01 transitional//en">
<html>
<head>
<script type="text/javascript" src="js/jquery.js"></script>
<style type="text/css">
table {
width: 360px;
height: 45px:
text-align: center;
margin-top: 120px;
border-collapse: collapse;
}
input {
width: 280px;
height: 30px;
}
</style>
</head>
<body>
<form action="#" method="post">
<center>
<table align="center" border="1">
<tr>
<td>用戶(hù)名:</td>
<td><input type="text" name="name" id="username"
onblur="verifyname()" /></td>
</tr>
<tr>
<td>密碼:</td>
<td><input type="text" name="pwd" id="mypwd"
onblur="verifypwd()" /></td>
</tr>
<tr>
<td colspan="3" align="center" height="36px"><input
type="button" style="width: 8rem;height:27px" value="提交登錄驗(yàn)證" /></td>
</tr>
</table>
</center>
</form>
<script type="text/javascript">
function verifyname() {
//用戶(hù)名校驗(yàn)
var verifyname = document.getelementbyid("username").value;
var name = /^[a-z][0-9a-za-z_][a-za-z0-9_]{5,19}$/; // 大寫(xiě)字母開(kāi)頭 6-20位字符(不允許有符號(hào)但是允許有_)
if (!name.test(verifyname)) {
//$("#username").after("大寫(xiě)字母開(kāi)頭6-20位字符(不允許有符號(hào)但是允許有_)");
$("#username").css("border-color", "red");
return false;
} else {
return true;
}
}
function verifypwd() {
//密碼
var verifypwd = document.getelementbyid("mypwd").value;
var pwd = /^[a-z][a-za-z0-9]\w{7,14}.{1,20}$/; //大寫(xiě)開(kāi)頭 數(shù)字字母符號(hào)混合 8-15位
if (!pwd.test(verifypwd)) {
$("#username").css("border-color", "red");
return false;
} else {
return true;
}
}
$(function() {
$(":button").on("click", function() {
$.ajax({
type : "post",
url : "ajaxservlet",
data : {
name : $("#username").val(),
pwd : $("#mypwd").val()
},
datatype : "text",
success : function(data) {
if (data == "ok") {
window.location.href = "show.jsp";
} else {
alert("登錄失??！");
$("#mypwd").val("");
$("#username").focus().select();
}
}
});
});
});
</script>
</body>
</html>
servlet代碼：
package com.chaz.servlet;
import java.io.ioexception;
import java.io.printwriter;
import javax.servlet.servletexception;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
public class ajaxservlet extends httpservlet {
public void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
dopost(request, response);
}
public void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
response.setcontenttype("text/html;charset=utf-8");
request.setcharacterencoding("utf-8");
printwriter out = response.getwriter();
string name = "zhangsan";
string pwd = "zhang123456";
string ajaxname = request.getparameter("name");
string ajaxpwd = request.getparameter("pwd");
system.out.println(ajaxname+":"+ajaxpwd);
if(name.equals(ajaxname)&&pwd.equals(ajaxpwd)){
out.print("ok");
}else{
out.print("error");
}
out.flush();
out.close();
}
}
web.xml:
<?xml version="1.0" encoding="utf-8"?> <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xsi:schemalocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <servlet> <description>this is the description of my j2ee component</description> <display-name>this is the display name of my j2ee component</display-name> <servlet-name>ajaxservlet</servlet-name> <servlet-class>com.chaz.servlet.ajaxservlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>ajaxservlet</servlet-name> <url-pattern>/ajaxservlet</url-pattern> </servlet-mapping> </web-app>
跳轉(zhuǎn)成功頁(yè)面就這個(gè)😄：
<body> 登錄成功！</body>
總結(jié)
以上所述是小編給大家介紹的使用ajax（包含正則表達(dá)式）驗(yàn)證用戶(hù)登錄的步驟,希望對(duì)大家有所幫助，如果大家有任何疑問(wèn)請(qǐng)給我留言，小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)碩編程網(wǎng)站的支持！
如果你覺(jué)得本文對(duì)你有幫助，歡迎轉(zhuǎn)載，煩請(qǐng)注明出處，謝謝！
學(xué)習(xí)AJAX