谷歌翻譯接口使用（android爲例）

對於android來說，很多翻譯接口要收費的。但是翻譯還是有很多網頁版的，因此爬蟲便成爲一種方式。谷歌翻譯中國版不需要翻牆，谷歌翻譯中有一個接口可以得到翻譯後的json。

例子：
https://translate.google.cn/translate_a/single?client=gtx&sl=en&tl=zh&dt=t&q=Do%20not%20work%20overtime%20tonight

在瀏覽器打開會下載一個f.txt的文件，內容爲：
[[[“今晚不要加班”,”Do not work overtime tonight”,null,null,3]],null,”en”]。
在android中使用流的方式接收，轉化爲json進行相應處理即可。

如果翻譯很長比如：
https://translate.google.cn/translate_a/single?client=gtx&sl=en&tl=zh&dt=t&q=The%20world%27s%20first%20railless%20train%20is%20tested%20in%20Zhuzhou,%20Central%20China%27s%20Hunan%20province,%20on%20Oct%2023,%202017.%20The%2030-meter%20train%20has%20three%20carriages%20and%20is%20developed%20by%20CRRC%20Zhuzhou%20Locomotive%20Co%20Ltd.%20The%20train%20can%20move%20at%20a%20speed%20of%2070%20km/h%20and%20can%20carry%20up%20to%20500%20passengers.

返回內容會是這個樣子的：
[[[“2017年10月23日，中國中部湖南省株洲市測試了世界上第一列無軌列車.30米長的列車有三個車廂，由中國中車株洲機車有限公司開發，列車時速可達70公里/”,”The world’s first railless train is tested in Zhuzhou, Central China’s Hunan province, on Oct 23, 2017. The 30-meter train has three carriages and is developed by CRRC Zhuzhou Locomotive Co Ltd. The train can move at a speed of 70 km/”,null,null,3],[“小時，可載500名乘客。”,”h and can carry up to 500 passengers.”,null,null,3]],null,”en”]
只要進行相應處理與拼接即可。

sl=en 爲source language，可設置爲auto。
tl=zh 爲target language，設置爲目標語言。
注意在android中使用HttpURLConnection的話，需要設置User-Agent如：HttpURLConnection.setRequestProperty(“User-Agent”, “Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36”);

支持的語言：
“auto”:””Automatic”,
“af”:”Afrikaans”,
“sq”:”Albanian”,
“ar”:”Arabic”,
“hy”:”Armenian”,
“az”:”Azerbaijani”,
“eu”:”Basque”,
“be”:”Belarusian”,
“bn”:”Bengali”,
“bs”:”Bosnian”,
“bg”:”Bulgarian”,
“ca”:”Catalan”,
“ceb”:”Cebuano”,
“ny”:”Chichewa”,
“zh-cn”:”Chinese Simplified”,
“zh-tw”:”Chinese Traditional”,
“co”:”Corsican”,
“hr”:”Croatian”,
“cs”:”Czech”,
“da”:”Danish”,
“nl”:”Dutch”,
“en”:”English”,
“eo”:”Esperanto”,
“et”:”Estonian”,
“tl”:”Filipino”,
“fi”:”Finnish”,
“fr”:”French”,
“fy”:”Frisian”,
“gl”:”Galician”,
“ka”:”Georgian”,
“de”:”German”,
“el”:”Greek”,
“gu”:”Gujarati”,
“ht”:”Haitian Creole”,
“ha”:”Hausa”,
“haw”:”Hawaiian”,
“iw”:”Hebrew”,
“hi”:”Hindi”,
“hmn”:”Hmong”,
“hu”:”Hungarian”,
“is”:”Icelandic”,
“ig”:”Igbo”,
“id”:”Indonesian”,
“ga”:”Irish”,
“it”:”Italian”,
“ja”:”Japanese”,
“jw”:”Javanese”,
“kn”:”Kannada”,
“kk”:”Kazakh”,
“km”:”Khmer”,
“ko”:”Korean”,
“ku”:”Kurdish (Kurmanji)”,
“ky”:”Kyrgyz”,
“lo”:”Lao”,
“la”:”Latin”,
“lv”:”Latvian”,
“lt”:”Lithuanian”,
“lb”:”Luxembourgish”,
“mk”:”Macedonian”,
“mg”:”Malagasy”,
“ms”:”Malay”,
“ml”:”Malayalam”,
“mt”:”Maltese”,
“mi”:”Maori”,
“mr”:”Marathi”,
“mn”:”Mongolian”,
“my”:”Myanmar (Burmese)”,
“ne”:”Nepali”,
“no”:”Norwegian”,
“ps”:”Pashto”,
“fa”:”Persian”,
“pl”:”Polish”,
“pt”:”Portuguese”,
“ma”:”Punjabi”,
“ro”:”Romanian”,
“ru”:”Russian”,
“sm”:”Samoan”,
“gd”:”Scots Gaelic”,
“sr”:”Serbian”,
“st”:”Sesotho”,
“sn”:”Shona”,
“sd”:”Sindhi”,
“si”:”Sinhala”,
“sk”:”Slovak”,
“sl”:”Slovenian”,
“so”:”Somali”,
“es”:”Spanish”,
“su”:”Sudanese”,
“sw”:”Swahili”,
“sv”:”Swedish”,
“tg”:”Tajik”,
“ta”:”Tamil”,
“te”:”Telugu”,
“th”:”Thai”,
“tr”:”Turkish”,
“uk”:”Ukrainian”,
“ur”:”Urdu”,
“uz”:”Uzbek”,
“vi”:”Vietnamese”,
“cy”:”Welsh”,
“xh”:”Xhosa”,
“yi”:”Yiddish”,
“yo”:”Yoruba”,
“zu”:”Zulu”

代碼例子：

/**
 * 翻譯回調
 */

public interface TranslateCallback{
    public void onTranslateDone(String result);
}

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.Executors;
import android.content.Context;
import android.os.AsyncTask;
import android.util.Log;

public class TranslateUtil {
    public static final String TRANSLATE_BASE_URL = "https://translate.google.cn/"; // 不需要翻牆即可使用
//    public static final String TRANSLATE_SINGLE_URL = "https://translate.google.cn/translate_a/single?client=gtx&sl=en&tl=zh&dt=t&q=Do%20not%20work%20overtime%20tonight";
    public static final String USER_AGENT = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36";

    private static String LAN_AUTO = "auto";

    /**
     * 翻譯，包含http請求，需要異步，返回""則爲翻譯失敗
     * @param sourceLan 源語言，如en，自動檢測爲auto
     * @param targetLan 目標語言如zh
     * @param content 翻譯文本
     * @return ""爲翻譯失敗，其餘成功
     */
    public void translate(Context context, String sourceLan, String targetLan, String content, TranslateCallback callback) {
        TranslateTask task = new TranslateTask(context, sourceLan, targetLan, content, callback);
        task.executeOnExecutor(Executors.newCachedThreadPool());
    }

    /**
     * 使用異步任務來翻譯，翻譯完成後回調callback
     */
    class TranslateTask extends AsyncTask<Void, Void, String> {
        String sourceLan;
        String targetLan;
        String content;
        Context context;
        TranslateCallback callback;
        private LoadingDalog loadingDalog = null; // 這個請自己定義加載中對話框，或者乾脆不使用
        TranslateTask(Context context, String sourceLan, String targetLan, String content, TranslateCallback callback){
            this.context = context;
            this.content = content;
            this.callback = callback;
            this.sourceLan = sourceLan;
            this.targetLan = targetLan;
        }

        @Override
        protected String doInBackground(Void... params) {
            String result = "";
            if (content == null || content.equals("")) {
                return result;
            }
            try {
                String googleResult = "";
                // 新建一個URL對象
                URL url = new URL(getTranslateUrl(sourceLan, targetLan, content));
                // 打開一個HttpURLConnection連接
                HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();
                // 設置連接主機超時時間
                urlConn.setConnectTimeout(5 * 1000);
                //設置從主機讀取數據超時
                urlConn.setReadTimeout(5 * 1000);
                // 設置是否使用緩存  默認是true
                urlConn.setUseCaches(false);
                // 設置爲Post請求
                urlConn.setRequestMethod("GET");
                //urlConn設置請求頭信息
                urlConn.setRequestProperty("User-Agent", USER_AGENT);
                //設置請求中的媒體類型信息。
//            urlConn.setRequestProperty("Content-Type", "application/json");
                //設置客戶端與服務連接類型
//            urlConn.addRequestProperty("Connection", "Keep-Alive");
                // 開始連接
                urlConn.connect();
                // 判斷請求是否成功
                int statusCode = urlConn.getResponseCode();
                if (statusCode == 200) {
                    // 獲取返回的數據
                    googleResult = streamToString(urlConn.getInputStream());
                }
                // 關閉連接
                urlConn.disconnect();

                // 處理返回結果，拼接
                JSONArray jsonArray = new JSONArray(googleResult).getJSONArray(0);
                for (int i = 0; i < jsonArray.length(); i++) {
                    result += jsonArray.getJSONArray(i).getString(0);
                }
            } catch (Exception e) {
//            result = "翻譯失敗";
                e.printStackTrace();
                result = "";
            }
            Log.d("TAG", "翻譯結果：" + result);
            return result;
        }

        @Override
        protected void onPostExecute(String result) {
            if (loadingDalog != null && loadingDalog.isShowing()) {
                loadingDalog.cancel();
            }
            if (callback != null){
                callback.onTranslateDone(result);
            }
            super.onPostExecute(result);
        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            String str = context.getString(R.string.translating);
            try {
                loadingDalog = new LoadingDalog(context);// Dialog使用、初始化
                loadingDalog.setMessage(str);
                loadingDalog.show();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 將輸入流轉換成字符串
     *
     * @param is 從網絡獲取的輸入流
     * @return 字符串
     */
    public static String streamToString(InputStream is) {
        try {
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
            int len = 0;
            while ((len = is.read(buffer)) != -1) {
                out.write(buffer, 0, len);
            }
            out.close();
            is.close();
            byte[] byteArray = out.toByteArray();
            return new String(byteArray);
        } catch (Exception e) {
            return null;
        }
    }

    public void translate(Context context, String targetLan, String content, TranslateCallback callback) {
        translate(context, LAN_AUTO, targetLan, content, callback);
    }


    private static String getTranslateUrl(String sourceLan, String targetLan, String content) {
        try {
            return TRANSLATE_BASE_URL + "translate_a/single?client=gtx&sl=" + sourceLan + "&tl=" + targetLan + "&dt=t&q=" + URLEncoder.encode(content, "UTF-8");
        } catch (Exception e) {
            return TRANSLATE_BASE_URL + "translate_a/single?client=gtx&sl=" + sourceLan + "&tl=" + targetLan + "&dt=t&q=" + content;
        }
}

// 使用
TranslateCallback translateCallback = new TranslateCallback() {
    @Override
    public void onTranslateDone(String result) {
        // result是翻譯結果，在這裏使用翻譯結果，比如使用對話框顯示翻譯結果
    }
}
new TranslateUtil().translate(activity, "auto", "en", "待翻譯內容", translateCallback);

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