調用谷歌翻譯API（FREE）的java代碼

由於工做產品須要，須要APP 開發翻譯功能。

因爲谷歌翻譯API進行收費，

搜索了一下，網上有2中方式實現。

1.破解生成token規律。

2.用httpclient訪問web，而後解析

兩種方式都比較麻煩。

通過google發現還有更簡單的方式：

"https://translate.googleapis.com/translate_a/single?client=gtx&sl={fromCulture}&tl={toCulture}&dt=t&q={text}" 

client ,dt 兩個參數不要修改，否則沒法正常工做

sl 爲要翻譯的文本語言，若是不知道，能夠爲auto

tl 爲目標語言。必須指定

q 爲要翻譯的文本。注意中文的 UrlEncoded 問題

寫成工具類能夠以下：

import com.alibaba.fastjson.JSONArray;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
import java.util.*;

public class GoogleTranslateTest {


    public static void main(String args[]) throws Exception {
        System.out.println("-----test-----");
        String txt="永和九年，歲在癸丑，暮春之初，會於會稽山陰之蘭亭，修禊事也。羣賢畢至，少長鹹集。此地有崇山峻嶺，茂林修竹；又有清流激湍，映帶左右，引覺得流觴曲水，列坐其次。雖無絲竹管絃之盛，一觴一詠，亦足以暢敘幽情。是日也，天朗氣清，惠風和暢，仰觀宇宙之大，俯察品類之盛，因此遊目騁懷，足以極視聽之娛，信可樂也。\n" +
                "夫人之相與，俯仰一世，或取諸懷抱，悟言一室以內；或因寄所託，放浪形骸以外。雖趣舍萬殊，靜躁不一樣，當其欣於所遇，暫得於己，快然自足，不知老之將至。及其所之既倦，情隨事遷，感慨系之矣。向之所欣，俯仰之間，已爲陳跡，猶不能不以之興懷。況修短隨化，終期於盡。古人云：「死生亦大矣。」豈不痛哉！(不知老之將至 一做：曾不知老之將至)\n" +
                "每覽昔人興感之由，若合一契，何嘗不臨文嗟悼，不能喻之於懷。固知一死生爲虛誕，齊彭殤爲妄做。後之視今，亦猶今之視昔。悲夫！故列敘時人，錄其所述，雖世殊事異，因此興懷，其致一也。後之覽者，亦將有感於斯文。";
        GT g = GT.getInstance();
        System.out.println( g.translateText(txt,"auto","en"));
        System.out.println( g.translateText("誰能說支持不支持","auto","en"));
    }
}

/**
 * 谷歌翻譯類
 */
class GT {

    private static final String PATH="https://translate.googleapis.com/translate_a/single"; //地址
    private static final String CLIENT="gtx";

    private static final String USER_AGENT="Mozilla/5.0";//"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36";

    private static final Map<String,String> LANGUAGE_MAP=new HashMap();

    private static GT _instance = null;

    /**
     * 獲取單例
     * @return
     */
    public static GT getInstance() {
        if( null == _instance){
            _instance = new GT();
            _instance.init();
        }
        return _instance;
    }

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

    /**
     * 判斷語言是否支持
     * @param language
     * @return
     */
    public boolean isSupport(String language){
        if( null == LANGUAGE_MAP.get( language )){
            return false;
        }
        return true;
    }

    /** 獲取 語言代碼
     * ISO 639-1 code
     * @param desiredLang 語言
     * @return 若是返回null則標示不支持
     */
    public String getCode(String desiredLang){
        if( null != LANGUAGE_MAP.get(desiredLang)){
            return desiredLang;
        }
        String tmp = desiredLang.toLowerCase();
        for(Map.Entry<String, String> enter : LANGUAGE_MAP.entrySet() ){
            if( enter.getValue().equals( tmp)){
                return enter.getKey();
            }
        }

        return null;
    }


    /**
     * 翻譯文本
     * @param text  文本內容
     * @param sourceLang  文本所屬語言。若是不知道，可使用auto
     * @param targetLang  目標語言。必須是明確的有效的目標語言
     * @return
     * @throws Exception
     */
    public String translateText(String text,String sourceLang, String targetLang) throws Exception{


        String retStr="";
        if( !( isSupport(sourceLang) || isSupport(targetLang) ) ){
            throw new Exception("不支持的語言類型");
        }

        List<NameValuePair> nvps = new ArrayList();
        nvps.add(new BasicNameValuePair("client", CLIENT));
        nvps.add(new BasicNameValuePair("sl", sourceLang));
        nvps.add(new BasicNameValuePair("tl", targetLang));
        nvps.add(new BasicNameValuePair("dt", "t"));
        nvps.add(new BasicNameValuePair("q", text));
//        String finalPath=PATH +"?client="+CLIENT+"&sl="+sourceLang+"&tl="+targetLang+"&dt=t&q="+ text ;

        String resp =  postHttp( PATH,nvps);
        if( null == resp ){
            throw  new Exception("網絡異常");
        }

//        System.out.println( "==>返回內容：" + resp);

        JSONArray jsonObject = JSONArray.parseArray( resp );
        for (Iterator<Object> it = jsonObject.getJSONArray(0).iterator(); it.hasNext(); ) {
            JSONArray a = (JSONArray) it.next();
            retStr += a.getString(0);
        }

        return retStr;
    }


    /**
     * post 請求
     * @param url 請求地址
     * @param nvps 參數列表
     * @return
     * @throws UnsupportedEncodingException
     */
    private   String postHttp( String url ,List<NameValuePair> nvps){
        String responseStr = null;
        CloseableHttpClient httpclient = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost( url );
        //重要！！必須設置 http 頭，不然返回爲亂碼
        httpPost.setHeader("User-Agent",USER_AGENT);
        CloseableHttpResponse response2 = null;
        try {
            // 重要！！ 指定編碼，對中文進行編碼
            httpPost.setEntity( new UrlEncodedFormEntity(nvps, Charset.forName("UTF-8"))  );
            response2 = httpclient.execute(httpPost);
            HttpEntity entity2 = response2.getEntity();
            responseStr = EntityUtils.toString(entity2);
            EntityUtils.consume(entity2);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (null != response2) {
                try {
                    response2.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if( null != httpclient ){
                try {
                    httpclient.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return responseStr;
    }


}