java - send response to local file -


i've got simple html page 1 button

<html> <head>     <script>         function sender() {             var oreq = new xmlhttprequest();             oreq.open('get', 'http://localhost:8888?param2=value2', true);             oreq.onreadystatechange = function() {                 if (oreq.readystate == 4) {                     if (oreq.status == 200) {                         alert(xmlhttp.responsetext);                     }                     if (oreq.status == 404) {                         alert("404040404!");                     }                 }             };             oreq.send();         }     </script> </head> <body>     <button id="click" onclick="sender();">send</button> </body> </html>

and i've got simple http server written on java nothing except reading incoming requests , showing console.

but how send response file server? example file located there

file:///c:/users/admin/desktop/development/test.html

and request looks this

get /?param2=value2 http/1.1 host: localhost:8888 user-agent: mozilla/5.0 (windows nt 6.1; rv:28.0) gecko/20100101 firefox/28.0 accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 accept-language: en,ru-ru;q=0.8,ru;q=0.5,en-us;q=0.3 accept-encoding: gzip, deflate origin: null connection: keep-alive  header parsing result: param2=value2

where , how send response?

server reading header this

bufferedreader reader = new bufferedreader(new inputstreamreader(             sock.getinputstream()));     stringbuilder sb = new stringbuilder();     string line = null;     while (true) {         line = reader.readline();         if (line == null || line.isempty())             break;         sb.append(line + system.getproperty("line.separator"));     }     return sb.tostring();

well, you're getting response, , if request ok response displayed in javascript alert. manipulation need replace alert actual display in html page.

oreq.onreadystatechange = function() {                 if (oreq.readystate == 4) {                     if (oreq.status == 200) {                         //this should put code (or function call) when went ok                     }                     if (oreq.status == 404) {                         //this when got 404 error                     }                 }             };

if wish save file on client machine, should send filestream server-side code can saved client (like file download), far know, can't in full ajax , need plain http request it. please note miss big part of error handling in ajax code... there many ways request fail other 404 error, , you're 1 setting 404 error maybe least probable happen.


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