/*
* Returns a new XMLHttpRequest object, or false if this browser
* doesn't support it
*/
function newXMLHttpRequest() {
var xmlreq = false;
if (window.XMLHttpRequest) {
// Create XMLHttpRequest object in non-Microsoft browsers
xmlreq = new XMLHttpRequest();
} else if (window.ActiveXObject) {
// Create XMLHttpRequest via MS ActiveX
try {
// Try to create XMLHttpRequest in later versions
// of Internet Explorer
xmlreq = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e1) {
// Failed to create required ActiveXObject
try {
// Try version supported by older versions
// of Internet Explorer
xmlreq = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e2) {
// Unable to create an XMLHttpRequest with ActiveX
}
}
}
return xmlreq;
}
/**
*url 提交的路径
*parameters 参数对(例如:param1=v1¶m2=v2)
*callback 回调函数
*
*如果要传输的数据过长需要将数据组织成参数对的形式传到parameters
*服务器端程序在取数据时候需要增加UTF-8编码,例如
*String curValue = java.net.URLDecoder.decode(request.getParameter(param), "UTF-8");
*/
function execService(url, parameters,callback) {
var xmlhttp = newXMLHttpRequest();
if(xmlhttp == null){
alert("初始化失败");
return ;
}
var async = false;
if (arguments.length == 3){
async=true;
}
xmlhttp.open("POST", url, async);
//修改url超长的问题
xmlhttp.setRequestHeader("Cache-Control","no-cache");
xmlhttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
if (async) {
var f = function() {
if (xmlhttp.readyState==4) {
callback(xmlhttp.responseText);
}
}
xmlhttp.onreadystatechange = f;
}
parameters=encodeURI(parameters);
parameters=encodeURI(parameters);
xmlhttp.send(parameters);
if (!async) {
var obj = xmlhttp.responseText;
if(typeof(obj) =='string' || typeof(obj) =='function' || typeof(obj) =='object')
{
return xmlhttp.responseText;
}
}
}
getResponse().setContentType("text/html;charset=GBK");
StringBuffer buffer = new StringBuffer();
buffer.append("XXX");
buffer.append("YYY");
getResponse().getWriter().println(buffer.toString());
return null;