標籤：src bsp 發送請求 分享 status web hang orm 服務
ajax 簡單登入說明:
//依據id尋找節點function $(id){ return document.getElementById(id);}//依據id尋找節點，然後返回節點的valuefunction $F(id){ return $(id).value;}//獲得ajax對象function getXhr(){ var xhr = null; if(window.XMLHttpRequest){ //非ie xhr= new XMLHttpRequest(); }else{ xhr= new ActiveXObject("Microsoft.XMLHttp"); } return xhr;}
<%@ page contentType="text/html; charset=utf-8" pageEncoding="utf-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><script type="text/javascript" src="js/ajax.js"></script><title>Insert title here</title> <script type="text/javascript"> function check_adminCode() { //step1.獲得ajax對象 var xhr = getXhr(); //step2.發送請求 xhr.open(‘get‘,‘check_admin.do?adminCode=‘+$F(‘adminCode‘) ,true); xhr.onreadystatechange = function(){ //step4.處理伺服器返回的資料 if(xhr.readyState == 4 && xhr.status == 200){ //獲得伺服器返回的資料 var txt = xhr.responseText; //更新頁面 $(‘adminCode_msg‘).innerHTML = txt; } }; xhr.send(null); } </script></head><body style="font-size: 30px;"> <form action="" method="post"> 帳號：<input id="adminCode" name="adminCode" onblur="check_adminCode();"/> <span id="adminCode_msg"></span> <br/> 密碼：<input type="password" name="pwd"/><br/> <input type="submit" value="確定"/> </form></body></html>
package web;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 ActionServlet extends HttpServlet{ public void service(HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException{ System.out.println("service()"); //擷取請求資源路徑 //http://ip:prot/ajax-day01/check.do String uri = req.getRequestURI(); System.out.println("uri:"+uri); //分析請求資源路徑 String action = uri.substring(uri.lastIndexOf("/"),uri.lastIndexOf(".")); System.out.println("action:"+action); res.setContentType("text/html;charset=utf-8"); PrintWriter out = res.getWriter(); //依據分析的結果，進行不同的處理。 if("/check_admin".equals(action)){ String adminCode = req.getParameter("adminCode"); System.out.println("adminCode:"+adminCode); if("King".equals(adminCode)){ out.println("帳號已經存在"); }else{ out.println("可以使用"); } } //檢查單機查看幸運數字 if("/click".equals(action)){ System.out.println("action:"+action); int num = (int)(Math.random()*10000); System.out.println(num); out.println(num); } }}
ajax簡單登入說明
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