httpclient4.3下载远程图片，设置user-agent和refer

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httpclient4.3下载远程图片，设置user-agent和伪装成google的refer， 并设置timeout.

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首先maven中加入jar依赖关系

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      	<!-- lock httpclient version -->
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.3.6</version>
</dependency>

<dependency>
	<groupId>org.slf4j</groupId>
	<artifactId>slf4j-api</artifactId>
	<version>1.7.10</version>
</dependency>

<dependency>
	<groupId>org.apache.commons</groupId>
	<artifactId>commons-io</artifactId>
	<version>1.3.2</version>
</dependency>

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package com.mkyong.common.util;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.commons.io.IOUtils;
import org.apache.http.HttpEntity;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ImageDownloader {

	private static final String USER_AGENT = "Mozilla/5.0 Firefox/26.0";

	private static Logger logger = LoggerFactory.getLogger(ImageDownloader.class);

	private static final int TIMEOUT_SECONDS = 120;

	private static final int POOL_SIZE = 120;

	private static CloseableHttpClient httpclient;

	public static void main(String[] args) throws ClientProtocolException, IOException {

		ImageDownloader imageDownloader = new ImageDownloader();
		imageDownloader.initApacheHttpClient();

		String imageUrl = "https://ibclaty.j.com/niku/ui/uitk/images/s.gif";
		imageDownloader.fetchContent(imageUrl);

		imageDownloader.destroyApacheHttpClient();
	}

	public void initApacheHttpClient() {
		// Create global request configuration
		RequestConfig defaultRequestConfig = RequestConfig.custom().setSocketTimeout(TIMEOUT_SECONDS * 1000)
				.setConnectTimeout(TIMEOUT_SECONDS * 1000).build();

		// Create an HttpClient with the given custom dependencies and
		// configuration.
		httpclient = HttpClients.custom().setUserAgent(USER_AGENT).setMaxConnTotal(POOL_SIZE)
				.setMaxConnPerRoute(POOL_SIZE).setDefaultRequestConfig(defaultRequestConfig).build();
	}

	private void destroyApacheHttpClient() {
		try {
			httpclient.close();
		} catch (IOException e) {
			logger.error("httpclient close fail", e);
		}
	}

	public void fetchContent(String imageUrl) throws ClientProtocolException, IOException {

		HttpGet httpget = new HttpGet(imageUrl);
		httpget.setHeader("Referer", "http://www.google.com");

		System.out.println("executing request " + httpget.getURI());
		CloseableHttpResponse response = httpclient.execute(httpget);

		try {
			HttpEntity entity = response.getEntity();

			if (response.getStatusLine().getStatusCode() >= 400) {
				throw new IOException("Got bad response, error code = " + response.getStatusLine().getStatusCode()
						+ " imageUrl: " + imageUrl);
			}
			if (entity != null) {
				InputStream input = entity.getContent();
				OutputStream output = new FileOutputStream(new File("D:\\website\\1.gif"));
				IOUtils.copy(input, output);
				output.flush();
			}
		} finally {
			response.close();

		}

	}
}

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