/*
* Copyright 2002-2010 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.
*/
package org.springframework.http.client;
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.util.Assert;
/**
* {@link ClientHttpRequestFactory} implementation that uses standard J2SE facilities.
*
* @author Arjen Poutsma
* @see java.net.HttpURLConnection
* @see CommonsClientHttpRequestFactory
* @since 3.0
*/
public class SimpleClientHttpRequestFactory implements ClientHttpRequestFactory {
private Proxy proxy;
/**
* Sets the {@link Proxy} to use for this request factory.
*/
public void setProxy(Proxy proxy) {
this.proxy = proxy;
}
public ClientHttpRequest createRequest(URI uri, HttpMethod httpMethod) throws IOException {
HttpURLConnection connection = openConnection(uri.toURL(), proxy);
prepareConnection(connection, httpMethod.name());
return new SimpleClientHttpRequest(connection);
}
/**
* 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 {
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);
}
}
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