AJAX处理以XML返回的响应
Ajax请求，服务器端返回XML形式的数据，在页面上用Javascript处理会非常方便。代码：
// 发送请求var req;function getXMLHttpRequest() {var xRequest = null;if (window.XMLHttpRequest) {xRequest = new XMLHttpRequest();} else if (typeof ActiveXObject != "undefined") {xRequest = new ActiveXObject("Microsoft.XMLHTTP");}return xRequest;}function sendRequest(url, params, HttpMethod, callback) {if (!HttpMethod) {HttpMethod = "GET";}req = getXMLHttpRequest();if (req) {req.onreadystatechange = callback;req.open(HttpMethod,url,true);req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=EUC-JP"); req.send(params);}}
// 回调函数function change() { if (xmlHttp.readyState == 4) { if (xmlHttp.status == 200) { var data = xmlHttp.responseXML; var datas = data.getElementsByTagName('info'); for (var i = 0; i < datas.length; i++) alert(datas.firstChild.nodeValue); datas = data.getElementsByTagName('memo'); for (i = 0; i < datas.length; i++) alert(datas.firstChild.nodeValue); } } }
// 服务器端代码// XML头，没有这个Javascript解析不出XML，编码一定要设，要不然会乱码StringBuilder infoBuilder = new StringBuilder("<?xml version=\"1.0\" encoding=\"EUC-JP\"?>");// 根元素<root></root>一定需要，否则Javascript解析不出XML，但名字不一定要叫rootinfoBuilder.append(("<root><info>a</info><info>b</info><memo>c</memo><memo>d</memo></root>"););PrintWriter writer = null;try {// 设置编码response.setContentType("text/xml;charset=EUC-JP");writer = response.getWriter();writer.println(infoBuilder.toString());writer.flush();} catch (Exception e) {} finally {if (writer != null) writer.close();}
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