开发环境：spring+struts2+ibatis

客户端页面代码：
function ajaxValName(value){
   <%-- ajax charge has the word existed in the database --%>
   var name=document.getElementById("keyword").value;
   if(name==null || trim(name)==""){
    alert("<s:text name="key.requireKey" />");
    document.forms[0].keyword.focus();
    return false;
   }
   
   
   var myAjax = new Ajax.Request(
            'checkWord.action',
            {method: 'post', parameters: 'key='+name, onComplete:
              function(r){
               if(r.responseText == "1"){
                alert("<s:text name="key.addKeyWordExist" />");
                document.forms[0].key.focus();
                return false;
               }else{
                document.forms[0].submit();
               }
                 }
                 }
            );
}

action中的代码： 

// ajax check the word is existed in the database
 public void checkWord() {
  HttpServletResponse response = ServletActionContext.getResponse();
  HttpServletRequest request = ServletActionContext.getRequest();

  response.setContentType("text/xml;charset=utf-8");
  response.setHeader("Cache-Control", "no-cache");

  String msgStr = "";

  if (orderofcastManager.checkWord(key)) {
   msgStr = "1";
  } else {
   msgStr = "0";
  }

  try {// response
   response.getWriter().print(msgStr);
   response.getWriter().close();
  } catch (IOException e) {
   e.printStackTrace();
  }
 }

service层中的代码：

public boolean checkWord(String keyword) {
  List list = orderofcastDao.findWordByWord(keyword);
  if(list == null || list.size()==0){
   return false;
  }else{
   return true;
  }
 }

 DAO层中的代码：

public List<Orderofcast> findWordByWord(String keyword) {
  return (List<Orderofcast>)super.queryForList("orderofcast.findWordsByWord",

keyword);
 }

 sql-map.xml中的代码：

 <select id="orderofcast.findWordsByWord" parameterClass="java.lang.String"

resultMap="orderofcastResult">
    select * from SEARCH_PRWORDS  where KEY_WORD = #keyword#
  </select>