使用jquery验证用户名称是否重复(jquery+sturts)

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jsp页面为:

<html>

<head>

var flag="true"; //判断用户名称是否重复

function mysubmit(){

    if(flag=="true"){
      alert("用户名已经存在或输入格式不正确");
}else{
    document.getElementById("myform").submit();
}

}

</head>

<body>

<FORM>

</body>

</html>

struts的action为：

public class ValidatorLoginNameAction extends org.springframework.web.struts.ActionSupport {
/*
* Generated Methods
*/

/**
* Method execute
* @param mapping
* @param form
* @param request
* @param response
* @return ActionForward
*/
public ActionForward execute(ActionMapping mapping, ActionForm form,
   HttpServletRequest request, HttpServletResponse response) throws Exception{
  // TODO Auto-generated method stub
  System.out.println("-------");
  IRegisterManagerService registerManager = (IRegisterManagerService) this.getService("registerManagerServiceImpl");
  String loginName=request.getParameter("loginName");

  boolean bool=registerManager.validatorName(loginName);//通过Service验证该用户是否存在

  if(bool==true){
   response.getWriter().write("true");//此值jquery可以接收到
  }else{

   response.getWriter().write("false");
  }
  return null;
}
/**
* <p>
* 获取业务服务对象；
* </p>
*
* @param serviceKey
*            服务对象ID；
* @return
*/
public Object getService(String serviceKey) {
  return this.getWebApplicationContext().getBean(serviceKey);
}

protected static Logger getLog() {
  return Logger.getInstance();
}