Struts2+AJax判断用户名是否存在

来源：互联网发布：足彩过滤软件编辑：程序博客网时间：2024/06/06 04:47

Struts2+AJax判断用户名是否存在，写的已经很详细了哦，如果还看不懂的话，可以留言，大家共同学习

JSP:

<Script>function CheckUserId(userId){var request;var span;span=document.getElementById("result");if(window.XMLHttpRequest){ request=new  XMLHttpRequest();//其他非ie浏览器支持}else if(window.ActiveXObject){request=new ActiveXObject("Microsoft.XMLHTTP");//微软的ie浏览器支持}request.onreadystatechange = function press() {     if(request.readyState < 4) {         span.style.color = "blue";         span.innerHTML="正在检测";     }     if(request.readyState == 4) {         if(request.status == 200) {             if(request.responseText == "用户ID已存在") {                 span.style.color = "red";                 span.innerHTML="ID已存在";             }else {                span.style.color = "green";                 span.innerHTML="可以使用哦~";             }                     }     }};request.open("get", "isExists.action?userId="+userId.value, true);request.setRequestHeader("Content-type","application/x-www-form-urlencoded");request.send(""); }</Script><input type="text" id="UserId" name="UserId" onblur="CheckUserId(this)"/>

Struts.xml中:

<action name="isExists" class="wys.zml.action.LoginAction"><result> /register.jsp</result>

Action中：

@Overridepublic String execute() throws Exception {// 集合Ajax，前台验证用户id是否已存在System.out.println("检测用户名是否存在");HttpServletRequest request = ServletActionContext.getRequest();HttpServletResponse respons = ServletActionContext.getResponse();String userid = request.getParameter("userId");respons.setContentType("text/html;charset=utf-8");String sendString = "";LoginDao logindao = new LoginDao();boolean flag = logindao.checkUserId(userid);// flag true为该用户名已存在，false为该用户名可以使用if (flag) {sendString = "用户ID已存在";respons.getWriter().print(sendString);} else {sendString = "该用户名可用！";respons.getWriter().print(sendString);}return null;}

4 0