[b]1.在页面的<script type="text/JavaScript" >内加入 [/b]//无刷新请求的xmlhttp请求 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('不能创建XMLHTTP实例!'); return false; } http_request.onreadystatechange=alertContents; http_request.open("POST",url,true); http_request.send(null); } [b]2.调用--在js调用请求【CONTROL为servlet配置的url-mapping,传参跟一般url传参一样】 [/b]createRequest('CONTROL'+'?cmd=listen'); [b]3.在servlet中处理【中文乱码问题】 [/b]PrintWriter out; response.setContentType("html/text");//此5行必备，用于输出中文，否则乱码 response.setCharacterEncoding("UTF-8"); response.setHeader("Cache-Control","no-cache"); out=response.getWriter(); out.println("对不起，系统忙，请稍后再试！"); //为返回的响应结果，在页面直接以alert()显示