@WebServlet(urlPatterns = {"/FristServlet"},name = "first")public class FristServlet extends HttpServlet { ???protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ???????String uname=request.getParameter("uname"); ???????if(uname.equals("admin")){ ???????????response.getWriter().write("true"); ???????}else{ ???????????response.getWriter().write("false"); ???????} ???} ???protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ???????doPost(request,response); ???}}public class Book { ???private String name; ???public String getName() { ???????return name; ???} ???public void setName(String name) { ???????this.name = name; ???}}<%@page language="java" pageEncoding="utf-8" isELIgnored="false" %><html><script type="text/javascript" src="js/jquery-1.8.3.js"></script><script type="text/javascript"> ??$(function () { ?????$("[name=uname]").blur(function(){ ???????/*oldAjax();*/ ??????/* newAjax();*/ ??????//get ???????/* ?$.get(‘/FristServlet‘,{"uname":$("[name=uname]").val()},function (data) { ?????????????$("#msg").html(data); ?????????})*/ ?????????//post ????????/* $.post(‘/FristServlet‘,{"uname":$("[name=uname]").val()},function (data) { ?????????????$("#msg").html(data); ?????????})*/ ????????//getJSON ?????????$.getJSON(‘/FristServlet‘,{"uname":$("[name=uname]").val()},function (data) { ????????????alert(typeof data); ?????????????$("#msg").html(data); ?????????}) ??????}); ??????var userArray = [ { ??????????"id" : 2, ??????????"name" : "admin", ??????????"pwd" : "123" ??????}, { ??????????"id" : 3, ??????????"name" : "詹姆斯", ??????????"pwd" : "11111" ??????}, { ??????????"id" : 4, ??????????"name" : "梅西", ??????????"pwd" : "6666" ??????} ];//在table内部追加一行 ?tr ??????var $table = $("<table border=‘1‘></table>").append("<tr><td>ID</td><td>用户名</td><td>密码</td></tr>"); ??????$.each(userArray,function(i,dom) { ??????????$table.append("<tr><td>" + dom.id+ "</td><td>" + dom.name+ "</td><td>"+ dom.pwd + "</td></tr>"); ??????}); ??????$("#objectArrayDiv").append($table); ?????????});function newAjax() { ???$.ajax({ ???????url:"/FristServlet", ???????type:"POST", ???????data:{"uname":$("[name=uname]").val()}, ???????async:true, ???????success:function (data) { ???????????$("#msg").html(data); ???????} ???});}//基础版 ???function oldAjax() { ???????var xhr=null; ???????var as=$("[name=uname]").val(); ??????if(window.XMLHttpRequest){ ?????????xhr=new XMLHttpRequest(); ??????} else{ ??????????xhr=new ActiveXObject(); ??????} ??????xhr.open("post","/FristServlet",true); ??????xhr.setRequestHeader("Content-Type","application/x-www-from-urlencoded"); ??????xhr.send("uname="+as); ??????xhr.onreadystatechange=function () { ??????????if(xhr.readyState==4&&xhr.status==200){ ??????????????var data=xhr.responseText; ??????????????$("#msg").html(data); ??????????} ??????} ???}</script><body><h2>Hello World!</h2><form id="from1"> ???<input name="uname"/><span id="msg"></span> ???<input name="upwd"/></form><div id="objectArrayDiv"></div></body></html>Ajax
原文地址：http://www.cnblogs.com/with-lj/p/7678716.html