1.在頁面的<script type="text/JavaScript" >內(nèi)加入
//無刷新請求的xmlhttp請求
var http_request=false;
function createRequest(url)
{
http_request = false;
if (window.XMLHttpRequest) { // Mozilla, Safari,...
http_request = new XMLHttpRequest();
if (http_request.overrideMimeType) {
http_request.overrideMimeType('text/html');
}
} else if (window.ActiveXObject) { // IE
try {
http_request = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
http_request = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {}
}
}
if (!http_request) {
alert('不能創(chuàng)建XMLHTTP實(shí)例!');
return false;
}
http_request.onreadystatechange=alertContents;
http_request.open("POST",url,true);
http_request.send(null);
}
2.調(diào)用--在js調(diào)用請求【CONTROL為servlet配置的url-mapping,傳參跟一般url傳參一樣】
createRequest('CONTROL'+'?cmd=listen');
3.在servlet中處理【中文亂碼問題】
PrintWriter out;
response.setContentType("html/text");//此5行必備，用于輸出中文，否則亂碼
response.setCharacterEncoding("UTF-8");
response.setHeader("Cache-Control","no-cache");
out=response.getWriter();
out.println("對不起，系統(tǒng)忙，請稍后再試！"); //為返回的響應(yīng)結(jié)果，在頁面直接以alert()顯示