JSP XMLHttpRequest动态无刷新及其中文乱码处理

1.在页面的<script type="text/javascript" >内加入
//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);
}
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】
createrequest('control'+'?cmd=listen');
3.在servlet中处理【中文乱码问题】
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
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