GoogleTranslator.java

package ender;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import org.json.JSONException;
import org.json.JSONObject;

public class GoogleTranslator {

	static public String apikey = "API-KEY";
	static public String apiurl = "https://www.googleapis.com/language/translate/v2?key=";
	static public String lang = "en";
	static public boolean turnedon = false;
	protected static final String ENCODING = "UTF-8";

	public static String translate(String str) {
		if (!turnedon)
			return str;
		String res = "";
		URL url = url(str);
		if (url == null)
			return str;
		try {
			final HttpURLConnection uc = (HttpURLConnection) url.openConnection();
			uc.setRequestMethod("GET");
			uc.setDoOutput(true);
			try {
				String result;
				try {
					result = inputStreamToString(uc.getInputStream());
				} catch (Exception e) {
					return str;
				}
				JSONObject o = new JSONObject(result);
				res = o.getJSONObject("data").getJSONArray("translations").getJSONObject(0).getString("translatedText");
				str = res;
				res = o.getJSONObject("data").getJSONArray("translations").getJSONObject(0).getString("detectedSourceLanguage");
				res = "[" + res + "] " + str;
			} catch (JSONException e) {
				return str;
			} finally { // http://java.sun.com/j2se/1.5.0/docs/guide/net/http-keepalive.html
				uc.getInputStream().close();
				if (uc.getErrorStream() != null) {
					uc.getErrorStream().close();
				}
			}
		} catch (IOException e) {
			return str;
		}

		return res;
	}

	private static String inputStreamToString(final InputStream inputStream) throws Exception {
		final StringBuilder outputBuilder = new StringBuilder();

		try {
			String string;
			if (inputStream != null) {
				BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, ENCODING));
				while (null != (string = reader.readLine())) {
					outputBuilder.append(string).append('\n');
				}
			}
		} catch (Exception ex) {
			throw new Exception("[google-api-translate-java] Error reading translation stream.", ex);
		}

		return outputBuilder.toString();
	}

	private static URL url(String str) {
		try {
			str = URLEncoder.encode(str, ENCODING);
		} catch (UnsupportedEncodingException e) {
			return null;
		}
		URL url = null;
		try {
			url = new URL(apiurl + apikey + "&target=" + lang + "&q=" + str);
		} catch (MalformedURLException e) {
			return null;
		}
		return url;
	}
}