Ajax+Struts做登录判断

来源：互联网发布：尼尔机械纪元卡顿优化编辑：程序博客网时间：2024/04/30 05:54

Action类里：

/* * 登录 */public ActionForward doLogin(ActionMapping  mapping,ActionForm form,HttpServletRequest request,HttpServletResponse response) throws IOException {    //获得表单数据int uid=Integer.parseInt(request.getParameter("petID"));String pwd=request.getParameter("pwd");PrintWriter out=response.getWriter();//根据ID获得其信息PetInfo info=petInfoBiz.getPetInfoByID(uid);if(info==null){               out.print(0);      return null;}else if(!petInfoBiz.login(uid, pwd)){       out.print(1);       return null;}else if(petInfoBiz.login(uid, pwd)){       out.print(2);       return null;}return null;}

页面的javascript部分(没有使用框架):

//根据IE的类型创建一个XmlHttpRequest对象function createXmlHttpRequest(){if(window.ActiveXObject){return new ActiveXObject("Microsoft.XMLHTTP");}else if(window.XMLHttpRequest){return new XMLHttpRequest;}}var xmlHttpRequest;//根据宠物编号发送请求到服务器function requestServer(){     var loginState=document.getElementById("loginState");    with(document.petForm)    {        if(petID.value=="")  {       loginState.innerText="请填写宠物编号！";  }  else if(isNaN(petID.value))  {       loginState.innerText="编号不合法";  }  else if(pwd.value=="")  {       loginState.innerText="请填写密码";  }  else  { var url="doPetInfo.do?methodName=doLogin&petID="+petID.value+"&pwd="+pwd.value;//创建XMLHttpRequest组件xmlHttpRequest=createXmlHttpRequest();//设置回调函数，让其等待服务器的响应xmlHttpRequest.onreadystatechange=doLogin;//初始化xmlHttpRequest组件,传入URLxmlHttpRequest.open("GET",url,true);//发送请求xmlHttpRequest.send(null);  }   }    }//登录，获得服务器返回的信息并做出相应提示function doLogin(){    var loginState=document.getElementById("loginState");if(xmlHttpRequest.readyState==0){loginState.innerText="未初始化...";}if(xmlHttpRequest.readyState==1){loginState.innerText="初始化中...";}if(xmlHttpRequest.readyState==2){loginState.innerText="正在向服务器发送请求...";}if(xmlHttpRequest.readyState==3){loginState.innerText="正在验证登录信息...";}if(xmlHttpRequest.readyState==4){loginState.innerText="验证完成...";}if(xmlHttpRequest.readyState==4 && xmlHttpRequest.status==200){var text=xmlHttpRequest.responseText;if(text=="0"){    loginState.innerText="此ID不存在";}else if(text=="1"){    loginState.innerText="密码错误";}else if(text=="2"){    loginState.innerText="验证成功...";location.href="doPetInfo.do?methodName=doInit&petID="+document.petForm.petID.value;}}}

表单部分：

<span id="loginState" style="color:red"></span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;宠物ID：<input type="text" name="petID" size="6" value="">密码：<input type="password" name="pwd" size="6" value="">&nbsp;&nbsp;&nbsp;&nbsp;<button onclick="requestServer()">登录</button>&nbsp;&nbsp;

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