JSP XMLHttpRequest: dynamically refresh and process Chinese garbled characters

1. Add <SCRIPT type = "text/JavaScript">
// XMLHTTP request without refreshing new requests
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 ('the XMLHTTP instance cannot be created! ');
Return false;
}
Http_request.onreadystatechange = alertcontents;
Http_request.open ("Post", URL, true );
Http_request.send (null );
}
2. Call -- call the request in JS [control the URL-mapping configured for servlet, passing parameters is the same as passing parameters in general URLs]
Createrequest ('control' + '? Cmd = Listen ');
3. Handling [Chinese garbled characters] In Servlet]
Printwriter out;
Response. setcontenttype ("html/text"); // these five lines are required to output Chinese characters; otherwise, garbled characters
Response. setcharacterencoding ("UTF-8 ");
Response. setheader ("cache-control", "No-Cache ");
Out = response. getwriter ();
Out. println ("sorry, the system is busy. Please try again later! "); // The returned response result is displayed on the page using alert ().