使用Ajax实现登录验证-优快云博客

本文链接：https://blog.youkuaiyun.com/Ceremony_feeling/article/details/102734107
使用ajax进行登陆验证

<%@ page language="java" import="java.util.*" pageEncoding="utf—8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
  </head>
  <body>
  <form action="#" method="post">
  账号:<input type="text" name="name" id="name"><br>
  密码:<input type="text" name="pwd" id="pwd"><br>
<input type="button" value="登录"/>  
  </form>
 <div id="show"></div> 
 <script>
 $(function(){
 $(":button").on("click",function(){
 $.ajax({
    type:"post",
    url:"test",
    data:{
    name:$("name").val(),
    pwd:$("pwd").val()
    
    },
    dataType:"text",
    success :function(data){
    if(data == "ok"){
    window.location.href="show.jsp";
    }else{
    $("#show").text("登录失败");
    }
    }
 });
 });
 });
 </script>
  </body>
</html>
2.
function IbtnEnter_onclick() {
            checklogin();
            return false;
        }
 
        function checklogin() {
        
            if ($("#name").val() == "" || $("#name").val().length < 5 || $("#name").val().length > 30 ) {
				$("#tip").html("提示：用户名必须填写，并且长度必须在5-30个字符之间！");
                $("#name").focus();
                return false;
            }
            else{
            	$("#tip").html(" ");
            }
 
            if ($("#pwd").val() == "" || $("#pwd").val().length < 8 || $("#pwd").val().length > 20 ) {
				$("#tip").html("提示：密码必须填写，并且长度必须在8-20个字符之间！");
                $("#pwd").focus();
                return false;
            }
            else{
            	$("#tip").html(" ");
            }
3.
 package sever;

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 {

		request.setCharacterEncoding("UTF-8");
		response.setContentType("text/html,charset = utf-8");
		response.setCharacterEncoding("utf-8");
		PrintWriter out = response.getWriter();
		String ajName = request.getParameter("name");
		String ajPwd = request.getParameter("pwd");
		System.out.println(ajName +":" +ajPwd);
		String name = "qingfeng";
		String pwd = "123456admin";
		
		if(ajName.equals(name) && ajPwd.equals(pwd)){
			out.print("ok");
		}
		out.flush();
		out.close();
	}
}