工作需要，寫了些ajax用于驗證???
摘抄一下：
action中：
??
? public class CheckIPAction extends Action {
????? public ActionForward execute(ActionMapping maping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {
??????? String message = "hi";
???????
??????? response.setContentType("application/x-www-form-urlencoded;charset=UTF-8");
??????? response.getWriter().write(message);
??????? return null;
????? }
??? }
?? jsp中的<script>里：
???????? //固定的，可寫個js
???????? function executeXhr(callback, url,info) {
???????? if (window.XMLHttpRequest) {
??????????? req = new XMLHttpRequest();
??????????? req.onreadystatechange = callback;
??????????? req.open("POST", url, true);
??????????? req.setRequestHeader("Content-Length",info.length);????
??????????? req.setRequestHeader("Content-Type","application/x-www-form-urlencoded;charset=UTF-8");
??????????? req.send("info");
???????? } else if (window.ActiveXObject) {
??????????? req = new ActiveXObject("Microsoft.XMLHTTP");
??????????? if (req) {
????????????? req.onreadystatechange = callback;
????????????? req.open("POST", url, true);
????????????? req.setRequestHeader("Content-Length",info.length);???
????????????? req.setRequestHeader("Content-Type","application/x-www-form-urlencoded;charset=UTF-8");
????????????? req.send(info);
??????????? }
????????? }
?????? }
?????? function processAjaxResponse() {
??????? if (req.readyState == 4) {
??????????? // only if "OK"
??????????? if (req.status == 200) {
?????????????? var res =? req.responseText;
?????????????? doResponse(res);
??????????? } else {
??????????????? alert("There was a problem retrieving the XML data:\n" +
??????????????? req.statusText);
??????????? }
???????? }
?????? }
???????
?????? //下面是需要修改的
?????? function sendRequest(){
????????? var url = "./checkIPAction.do";
????????? var callback = processAjaxResponse;
????????? var queryStr = "ips=1";
????????? executeXhr(callback, url,queryStr);??????
?????? }
?????? function doResponse(response){
????????????? msg.innerHTML = response;
?????? }