HttpUtil.java

package org.ukiuni.pacifista.util;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Authenticator;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.PasswordAuthentication;
import java.net.Proxy;
import java.net.URL;
import java.net.URLConnection;
import java.util.Map;

public class HttpUtil {
	public enum HttpMethod {
		GET, POST, PUT, DELETE;
	}

	public static void download(String url, OutputStream out) throws IOException {
		download(url, out, null, 0, null, null);
	}

	public static URLConnection openConnection(String url, HttpMethod method, String parameter, Map<String, String> header, String proxyHost, int proxyPort, final String proxyUser, final String proxyPass) throws IOException {
		HttpURLConnection connection;
		if (null == proxyHost) {
			connection = (HttpURLConnection) new URL(url).openConnection();
		} else {
			connection = (HttpURLConnection) new URL(url).openConnection(new Proxy(Proxy.Type.HTTP, new InetSocketAddress(proxyHost, proxyPort)));
			if (null != proxyUser && null != proxyPass) {
				Authenticator.setDefault(new Authenticator() {
					@Override
					protected PasswordAuthentication getPasswordAuthentication() {
						return new PasswordAuthentication(proxyUser, proxyPass.toCharArray());
					}
				});
			}
		}
		connection.setRequestMethod(method.toString());
		if (null != header) {
			for (String key : header.keySet()) {
				connection.addRequestProperty(key, header.get(key));
				System.out.println("add request property " + key + ":" + header.get(key));
			}
		}
		if (HttpMethod.POST.equals(method) || HttpMethod.PUT.equals(method)) {
			connection.setDoOutput(true);
			if (null != parameter) {
				OutputStream out = connection.getOutputStream();
				out.write(parameter.getBytes("UTF-8"));
			}
		}
		return connection;
	}

	public static void download(String url, OutputStream out, String proxyHost, int proxyPort, final String proxyUser, final String proxyPass) throws IOException {
		httpRequest(url, HttpMethod.GET, out, proxyHost, proxyPort, proxyUser, proxyPass);
	}

	public static void httpRequest(String url, HttpMethod httpMethod, OutputStream out, String proxyHost, int proxyPort, final String proxyUser, final String proxyPass) throws IOException {
		InputStream in = openConnection(url, httpMethod, null, null, proxyHost, proxyPort, proxyUser, proxyPass).getInputStream();
		IOUtil.copy(in, out);
		Authenticator.setDefault(null);
		in.close();
	}

	public static void httpRequest(String url, HttpMethod httpMethod, OutputStream out, String parameter, Map<String, String> header, String proxyHost, int proxyPort, final String proxyUser, final String proxyPass) throws IOException {
		InputStream in = openConnection(url, httpMethod, parameter, header, proxyHost, proxyPort, proxyUser, proxyPass).getInputStream();
		IOUtil.copy(in, out);
		Authenticator.setDefault(null);
		in.close();
	}
}