List of usage examples for java.net HttpURLConnection getIfModifiedSince
public long getIfModifiedSince()
From source file:com.cr_wd.android.network.HttpClient.java
/** * Performs a HTTP GET/POST Request//from w ww .j a v a 2 s. c o m * * @return id of the request */ protected int doRequest(final Method method, final String url, HttpHeaders headers, HttpParams params, final HttpHandler handler) { if (headers == null) { headers = new HttpHeaders(); } if (params == null) { params = new HttpParams(); } handler.client = this; final int requestId = incrementRequestId(); class HandlerRunnable extends Handler implements Runnable { private final Method method; private String url; private final HttpHeaders headers; private final HttpParams params; private final HttpHandler handler; private HttpResponse response; private boolean canceled = false; private int retries = 0; protected HandlerRunnable(final Method method, final String url, final HttpHeaders headers, final HttpParams params, final HttpHandler handler) { this.method = method; this.url = url; this.headers = headers; this.params = params; this.handler = handler; } @Override public void run() { execute(); } private void execute() { response = new HttpResponse(requestId, method, url); HttpURLConnection conn = null; try { /* append query string for GET requests */ if (method == Method.GET) { if (!params.urlParams.isEmpty()) { url += ('?' + params.getParamString()); } } /* setup headers for POST requests */ if (method == Method.POST) { headers.addHeader("Accept-Charset", requestOptions.encoding); if (params.hasMultipartParams()) { final SimpleMultipart multipart = params.getMultipart(); headers.addHeader("Content-Type", multipart.getContentType()); } else { headers.addHeader("Content-Type", "application/x-www-form-urlencoded;charset=" + requestOptions.encoding); } } if (canceled) { postCancel(); return; } /* open and configure the connection */ conn = (HttpURLConnection) new URL(url).openConnection(); postStart(); if (method == Method.GET) { conn = (HttpURLConnection) new URL(url).openConnection(); conn.setRequestMethod("GET"); } else if (method == Method.POST) { conn.setRequestMethod("POST"); conn.setDoOutput(true); conn.setDoInput(true); conn.setUseCaches(false); } conn.setAllowUserInteraction(false); conn.setReadTimeout(requestOptions.readTimeout); conn.setConnectTimeout(requestOptions.connectTimeout); /* add headers to the connection */ for (final Map.Entry<String, List<String>> entry : headers.getHeaders().entrySet()) { for (final String value : entry.getValue()) { conn.addRequestProperty(entry.getKey(), value); } } if (canceled) { try { conn.disconnect(); } catch (final Exception e) { } postCancel(); return; } response.requestProperties = conn.getRequestProperties(); /* do post */ if (method == Method.POST) { InputStream is; if (params.hasMultipartParams()) { is = params.getMultipart().getContent(); } else { is = new ByteArrayInputStream(params.getParamString().getBytes()); } final OutputStream os = conn.getOutputStream(); writeStream(os, is); } else { conn.connect(); } if (canceled) { try { conn.disconnect(); } catch (final Exception e) { } postCancel(); return; } response.contentEncoding = conn.getContentEncoding(); response.contentLength = conn.getContentLength(); response.contentType = conn.getContentType(); response.date = conn.getDate(); response.expiration = conn.getExpiration(); response.headerFields = conn.getHeaderFields(); response.ifModifiedSince = conn.getIfModifiedSince(); response.lastModified = conn.getLastModified(); response.responseCode = conn.getResponseCode(); response.responseMessage = conn.getResponseMessage(); /* do get */ if (conn.getResponseCode() < 400) { response.responseBody = readStream(conn.getInputStream()); postSuccess(); } else { response.responseBody = readStream(conn.getErrorStream()); response.throwable = new Exception(response.responseMessage); postError(); } } catch (final Exception e) { if (retries < requestOptions.maxRetries) { retries++; postRetry(); execute(); } else { response.responseBody = e.getMessage(); response.throwable = e; postError(); } } finally { if (conn != null) { conn.disconnect(); } } } private String readStream(final InputStream is) throws IOException { final BufferedInputStream bis = new BufferedInputStream(is); final ByteArrayBuffer baf = new ByteArrayBuffer(50); int read = 0; final byte[] buffer = new byte[8192]; while (true) { if (canceled) { break; } read = bis.read(buffer); if (read == -1) { break; } baf.append(buffer, 0, read); } try { bis.close(); } catch (final IOException e) { } try { is.close(); } catch (final IOException e) { } return new String(baf.toByteArray()); } private void writeStream(final OutputStream os, final InputStream is) throws IOException { final BufferedInputStream bis = new BufferedInputStream(is); int read = 0; final byte[] buffer = new byte[8192]; while (true) { if (canceled) { break; } read = bis.read(buffer); if (read == -1) { break; } os.write(buffer, 0, read); } if (!canceled) { os.flush(); } try { os.close(); } catch (final IOException e) { } try { bis.close(); } catch (final IOException e) { } try { is.close(); } catch (final IOException e) { } } @Override public void handleMessage(final Message msg) { if (msg.what == HttpHandler.MESSAGE_CANCEL) { canceled = true; } } private void postSuccess() { postMessage(HttpHandler.MESSAGE_SUCCESS); } private void postError() { postMessage(HttpHandler.MESSAGE_ERROR); } private void postCancel() { postMessage(HttpHandler.MESSAGE_CANCEL); } private void postStart() { postMessage(HttpHandler.MESSAGE_START); } private void postRetry() { postMessage(HttpHandler.MESSAGE_RETRY); } private void postMessage(final int what) { final Message msg = handler.obtainMessage(); msg.what = what; msg.arg1 = requestId; msg.obj = response; handler.sendMessage(msg); } } ; /* Create a new HandlerRunnable and start it */ final HandlerRunnable hr = new HandlerRunnable(method, url, headers, params, handler); requests.put(requestId, new WeakReference<Handler>(hr)); new Thread(hr).start(); /* Return with the request id */ return requestId; }