一个简单的Struts +ajax 的例子

 jsp 中

javascript

<script  language="javascript" type="text/javascript">
var xmlHttp =false;
try{
xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");

}catch(e){
try{
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP")
}catch(e2){
xmlHttp=false;
}

if (!xmlHttp && typeof XMLHttpRequest != 'undefined') {
  xmlHttp = new XMLHttpRequest();
}

function callServer() {
   document.all('resulte').style.display="";
  document.getElementById("resulte").innerHTML="正在处理，请等待...."

  var url = "../../dealwuren.do?method=dealKA";
 
  xmlHttp.open("POST", url, true);
 
  xmlHttp.onreadystatechange = updatePage;

  xmlHttp.send(null);
 
}
function updatePage() {
  if (xmlHttp.readyState == 4) {
     var response = xmlHttp.responseText;
   
     document.getElementById("resulte").innerHTML=response;
 
  }
}

}

</script>

                              <td bgcolor="#E6970E" height="2"><div  id="resulte"  style="display:none">个</div><br>
                                  <input type="button"  name="ont" onclick="callServer()" value="处理无人卡"/>
                             
                              </td>
                        
                        

Struts-config.xml:

  <action input="/teacher/upload/frameset.htm"
        parameter="method" path="/dealwuren"
        type="com.ins.action.PeScoreQueryAction">
        <forward name="success" path="/teacher/upload/dealwuren.jsp" />
        <forward name="failure" path="/common/error.jsp" />
      </action>
  

action

    public ActionForward dealKA(ActionMapping _mapping,ActionForm Form,HttpServletRequest request,HttpServletResponse response){
            response.setCharacterEncoding("UTF-8");
      PrintWriter pw=response.getWriter();

        pw.print("数据已经处理过！不需要再处理");
       
           pw.close();
      
       }catch(Exception ex){
        request.setAttribute("error", ex.getMessage());
       }
      
     return null; 
     }