javascript请求servlet实现ajax示例(分享)_AJAX相关_

 function sendRequestByGet(){ //定义异步请求对象 var xmlReq; //检测浏览器是否直接支持ajax if(window.XMLHttpRequest){//直接支持ajax xmlReq=new XMLHttpRequest(); }else{//不直接支持ajax xmlReq=new ActiveObject('Microsoft.XMLHTTP'); } //设置回调函数 xmlReq.onreadystatechange=function(){ if (xmlReq.readyState==4&&xmlReq.status==200) { //获取服务器的响应值 var result=xmlReq.responseText; //后续操作 alert(result); } }; //创建异步get请求 var url="Hello?name=zhangsan"; xmlReq.open("GET",url,true); //发送请求 xmlReq.send(null); }

 function sendRequestByPost(){ //定义异步请求对象 var xmlReq; //检测浏览器是否直接支持ajax if(window.XMLHttpRequest){//直接支持ajax xmlReq=new XMLHttpRequest(); }else{//不直接支持ajax xmlReq=new ActiveObject('Microsoft.XMLHTTP'); } //设置回调函数 xmlReq.onreadystatechange=function(){ if (xmlReq.readyState==4&&xmlReq.status==200) { //获取服务器的响应值 var result=xmlReq.responseText; //后续操作 alert(result); } }; //创建异步Post请求 var url="Hello"; xmlReq.open("POST",url,true); xmlReq.setRequestHeader("Content-Type","application/x-www-form-urlencoded"); //发送请求 var data="name=lisi"; xmlReq.send(data); }

 @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String name=req.getParameter("name"); PrintWriter out = resp.getWriter(); out.print(name); }