struts2 + ajax 用户名登录验证（struts2+spring+ibatis）

js代码：

[javascript]view plaincopy<!-- ajax 验证 -->

<script type="text/javascript">

var xmlHttp;

var result = false;

function checkuid(){

var uname = document.all.userName.value;

if(uname.length<3){

document.all.unameMsg.innerHTML="<font color='red'>用户名太短，请重新输入！</font>";

returnfalse;

}else{

document.all.unameMsg.innerHTML="<font color='red'>用户名检测中...</font>";

if(window.ActiveXObject){

xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");

}elseif(window.XMLHttpRequest){

xmlHttp = new XMLHttpRequest();

}

var uri = "NewHouseUserAction!execute.oj?user="+uname;

uri = encodeURI(uri);

uri = encodeURI(uri);

xmlHttp.open("post",uri,true);

xmlHttp.onreadystatechange = function(){

if(xmlHttp.readyState==4){

if(xmlHttp.status==200){

var flag = xmlHttp.responseText;

if(flag=="true"){

document.all.unameMsg.innerHTML="<font color='red'>该用户名已被使用，请您重新选择用户名！</font>";

result = false;

}else{

document.all.unameMsg.innerHTML="<font color='red'>恭喜您，该用户名可用!</font>";

result = true ;

}

}

}

}

xmlHttp.send(null);

}

}

</script>

[html]view plaincopy<s:formaction="NewHouseUserAction!developRegister.oj"onsubmit="return validateForm(this);"method="post"enctype="multipart/form-data">

<ul>

<spanstyle="white-space:pre"></span><li>

<labelclass="span_item">用户名:</label>

<inputtype="text"name="userName"value="${developUser.username}"

class="input_text"id="userName"onblur="checkuid();"/>

<divid="unameMsg"></div>

<imgsrc="../images/check_right.gif"class="li_imgtip"/>

<spanclass="li_tip">4-15个字符(包括英文字母、数字、下划线，区分大小写) </span>

<divclass="clear"></div>

</li>

其他注册代码省略。。。。。

</s:form>

action 代码：

[java]view plaincopypublic String checkUser() {

developService = (DevelopService) this.getBean("developService");

String userName = this.request().getParameter("user");

PrintWriter pw = null;

try {

pw = this.response().getWriter();

response().setContentType("html/text");

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

Map map = new HashMap();

map.put("username", userName.trim());

Object object = developService.getObject(

"develop.abatorgenerated_ByUser", map);

if (object!=null) {

pw.write("true");

}else {

pw.write("false");

}

pw.flush();

pw.close();

return SUCCESS;

}

struts.xml 代码（spring bean注入这一块就不贴了，直接贴页面跳转代码）：

<!-- 开发商新房发布登录页面 -->
[html]view plaincopy<actionname="NewHouseUserAction"

class="com.onejia.www.web.action.DevelopAction">

<resultname="index">/index2.jsp</result>

<resultname="succeed">/jsp/registerSucceed.jsp</result>

<resultname="register">/jsp/developRegister.jsp</result>

<resultname="login">/jsp/login.jsp</result>

<resultname="success">/jsp/developRegister.jsp</result>

</action>

已经测试成功！！