Java tutorial
package ar.com.aleatoria.ue.rest; /* * Copyright 2002-2011 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.io.IOException; import java.net.HttpURLConnection; import java.net.Proxy; import java.net.URI; import java.net.URL; import java.net.URLConnection; import org.springframework.http.HttpMethod; import org.springframework.http.client.ClientHttpRequest; import org.springframework.http.client.ClientHttpRequestFactory; import org.springframework.util.Assert; /** * This class is a modification of the class SimpleClientHttpRequestFactory that make us able * to set a CredentialProvider. * * @author Arjen Poutsma * @author Roy Clarkson * @autor Agus * @see java.net.HttpURLConnection * @see org.springframework.http.client.SimpleClientHttpRequestFactory * @since 1.0 */ public class SecureSimpleClientHttpRequestFactory implements ClientHttpRequestFactory { // Specifying 0 results in the Android system default chunk length private static final int DEFAULT_CHUNK_SIZE = 0; private Proxy proxy; private boolean bufferRequestBody = true; private int chunkSize = DEFAULT_CHUNK_SIZE; private int connectTimeout = -1; private int readTimeout = -1; /** * Sets the {@link Proxy} to use for this request factory. */ public void setProxy(Proxy proxy) { this.proxy = proxy; } protected CredentialsProvider credentialsProvider; public SecureSimpleClientHttpRequestFactory() { } public CredentialsProvider getCredentialsProvider() { return credentialsProvider; } public void setCredentialsProvider(CredentialsProvider credentialsProvider) { this.credentialsProvider = credentialsProvider; } /** * If you want specify the encrypting method that use your own SecureSimpleClient implementation * then you should override this class and specify the authentication method. * @param connection */ public void prepareSecureConnection(HttpURLConnection connection) { } /** * Indicates whether this request factory should buffer the {@linkplain ClientHttpRequest#getBody() request body} * internally. * <p> * Default is {@code true}. When sending large amounts of data via POST or PUT, it is recommended to change this * property to {@code false}, so as not to run out of memory. This will result in a {@link ClientHttpRequest} that * either streams directly to the underlying {@link HttpURLConnection} (if the * {@link org.springframework.http.HttpHeaders#getContentLength() Content-Length} is known in advance), or that will * use "Chunked transfer encoding" (if the {@code Content-Length} is not known in advance). * * @see #setChunkSize(int) * @see HttpURLConnection#setFixedLengthStreamingMode(int) */ public void setBufferRequestBody(boolean bufferRequestBody) { this.bufferRequestBody = bufferRequestBody; } /** * Sets the number of bytes to write in each chunk when not buffering request bodies locally. * <p> * Note that this parameter is only used when {@link #setBufferRequestBody(boolean) bufferRequestBody} is set to * {@code false}, and the {@link org.springframework.http.HttpHeaders#getContentLength() Content-Length} is not * known in advance. * * @see #setBufferRequestBody(boolean) */ public void setChunkSize(int chunkSize) { this.chunkSize = chunkSize; } /** * Set the underlying URLConnection's connect timeout (in milliseconds). A timeout value of 0 specifies an infinite * timeout. * <p> * Default is the system's default timeout. * * @see URLConnection#setConnectTimeout(int) */ public void setConnectTimeout(int connectTimeout) { this.connectTimeout = connectTimeout; } /** * Set the underlying URLConnection's read timeout (in milliseconds). A timeout value of 0 specifies an infinite * timeout. * <p> * Default is the system's default timeout. * * @see URLConnection#setReadTimeout(int) */ public void setReadTimeout(int readTimeout) { this.readTimeout = readTimeout; } public ClientHttpRequest createRequest(URI uri, HttpMethod httpMethod) throws IOException { HttpURLConnection connection = openConnection(uri.toURL(), this.proxy); prepareConnection(connection, httpMethod.name()); prepareSecureConnection(connection); if (this.bufferRequestBody) { return new SimpleBufferingClientHttpRequest(connection); } else { return new SimpleStreamingClientHttpRequest(connection, this.chunkSize); } } /** * Opens and returns a connection to the given URL. * <p> * The default implementation uses the given {@linkplain #setProxy(java.net.Proxy) proxy} - if any - to open a * connection. * * @param url the URL to open a connection to * @param proxy the proxy to use, may be {@code null} * @return the opened connection * @throws IOException in case of I/O errors */ protected HttpURLConnection openConnection(URL url, Proxy proxy) throws IOException { URLConnection urlConnection = (proxy != null ? url.openConnection(proxy) : url.openConnection()); Assert.isInstanceOf(HttpURLConnection.class, urlConnection); return (HttpURLConnection) urlConnection; } /** * Template method for preparing the given {@link HttpURLConnection}. * <p> * The default implementation prepares the connection for input and output, and sets the HTTP method. * * @param connection the connection to prepare * @param httpMethod the HTTP request method ({@code GET}, {@code POST}, etc.) * @throws IOException in case of I/O errors */ protected void prepareConnection(HttpURLConnection connection, String httpMethod) throws IOException { if (this.connectTimeout >= 0) { connection.setConnectTimeout(this.connectTimeout); } if (this.readTimeout >= 0) { connection.setReadTimeout(this.readTimeout); } connection.setDoInput(true); if ("GET".equals(httpMethod)) { connection.setInstanceFollowRedirects(true); } else { connection.setInstanceFollowRedirects(false); } if ("PUT".equals(httpMethod) || "POST".equals(httpMethod)) { connection.setDoOutput(true); } else { connection.setDoOutput(false); } connection.setRequestMethod(httpMethod); } }