使用httpclient实现免费的google翻译api

由於Google translate API要收錢 ，因此想了一個偷機的方法

1. 用HttpClient發送一個request給http://translate.google.com

2. 再用Jsoup來parse html, 並取出翻譯後的文字

复制代码 代码如下:

/** * Copyright (c) blackbear, Inc All Rights Reserved. */package org.bb.util.i18n; import java.io.InputStream;import java.net.URLEncoder;import java.text.MessageFormat; import org.apache.commons.io.IOUtils; import org.bb.util.net.http.HttpClientUtil;import org.jsoup.Jsoup;import org.jsoup.nodes.Document;import org.jsoup.nodes.Element; /** * TranslateUtil *  *

翻譯工具 * PS: 透過google translate * 

 *  * @author catty * @version 1.0, Created on 2011/9/2 */public class TranslateUtil {  protected static final String URL_TEMPLATE = "http://translate.google.com/?langpair={0}&text={1}"; protected static final String ID_RESULTBOX = "result_box"; protected static final String ENCODING = "UTF-8";  protected static final String AUTO = "auto"; // google自動判斷來源語系 protected static final String TAIWAN = "zh-TW"; // 繁中 protected static final String CHINA = "zh-CN"; // 簡中 protected static final String ENGLISH = "en"; // 英 protected static final String JAPAN = "ja"; // 日  /**  *

Google翻譯  * PS: 交由google自動判斷來源語系  * 

  *   * @param text  * @param target_lang 目標語系  * @return  * @throws Exception  */ public static String translate(final String text, final String target_lang) throws Exception {  return translate(text, AUTO, target_lang); }  /**  *

Google翻譯

  *   * @param text  * @param src_lang 來源語系  * @param target_lang 目標語系  * @return  * @throws Exception  */ public static String translate(final String text, final String src_lang, final String target_lang)   throws Exception {  InputStream is = null;  Document doc = null;  Element ele = null;  try {   // create URL string   String url = MessageFormat.format(URL_TEMPLATE,     URLEncoder.encode(src_lang + "|" + target_lang, ENCODING),     URLEncoder.encode(text, ENCODING));    // connect & download html   is = HttpClientUtil.downloadAsStream(url);    // parse html by Jsoup   doc = Jsoup.parse(is, ENCODING, "");   ele = doc.getElementById(ID_RESULTBOX);   String result = ele.text();   return result;   } finally {   IOUtils.closeQuietly(is);   is = null;   doc = null;   ele = null;  } }  /**  *

Google翻譯: 簡中-->繁中

  *   * @param text  * @return  * @throws Exception  */ public static String cn2tw(final String text) throws Exception {  return translate(text, CHINA, TAIWAN); }  /**  *

Google翻譯: 繁中-->簡中

  *   * @param text  * @return  * @throws Exception  */ public static String tw2cn(final String text) throws Exception {  return translate(text, TAIWAN, CHINA); }  /**  *

Google翻譯: 英文-->繁中

  *   * @param text  * @return  * @throws Exception  */ public static String en2tw(final String text) throws Exception {  return translate(text, ENGLISH, TAIWAN); }  /**  *

Google翻譯: 繁中-->英文

  *   * @param text  * @return  * @throws Exception  */ public static String tw2en(final String text) throws Exception {  return translate(text, TAIWAN, ENGLISH); }  /**  *

Google翻譯: 日文-->繁中

  *   * @param text  * @return  * @throws Exception  */ public static String jp2tw(final String text) throws Exception {  return translate(text, JAPAN, TAIWAN); }  /**  *

Google翻譯: 繁中-->日

  *   * @param text  * @return  * @throws Exception  */ public static String tw2jp(final String text) throws Exception {  return translate(text, TAIWAN, JAPAN); }}

HttpClientUtil.java

复制代码 代码如下:

/** * Copyright (c) Blackbear, Inc All Rights Reserved. */package org.bb.util.net.http; import java.io.BufferedInputStream;import java.io.File;import java.io.FileOutputStream;import java.io.InputStream;import java.util.Map; import org.apache.commons.io.IOUtils;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.methods.HttpPost;import org.apache.http.client.methods.HttpRequestBase;import org.apache.http.conn.scheme.PlainSocketFactory;import org.apache.http.conn.scheme.Scheme;import org.apache.http.conn.scheme.SchemeRegistry;import org.apache.http.conn.ssl.SSLSocketFactory;import org.apache.http.entity.BufferedHttpEntity;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;import org.apache.http.params.BasicHttpParams; /** * PostUtil.java *  * @author catty * @version 1.0, Created on 2008/2/20 */public class HttpClientUtil {  protected static Log log = LogFactory.getLog(HttpClientUtil.class); protected static HttpClient httpclient = null; protected static int maxTotal = 200; protected static int maxPerRoute = 20; protected static String userAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.77 Safari/535.7";  static {  if (httpclient == null) {   // ~~~~~~~~~~~~~~~~~~~~   // create httpclient   // ~~~~~~~~~~~~~~~~~~~~   SchemeRegistry reg = new SchemeRegistry();   reg.register(new Scheme("http", 80, PlainSocketFactory.getSocketFactory()));   reg.register(new Scheme("https", 443, SSLSocketFactory.getSocketFactory()));   ThreadSafeClientConnManager cm = new ThreadSafeClientConnManager(reg);   cm.setMaxTotal(maxTotal);   cm.setDefaultMaxPerRoute(maxPerRoute);   httpclient = new DefaultHttpClient(cm);  } }  /**  *

下載後回傳Inputstream

  *   * @param url  * @return  * @throws Exception  */ public static InputStream downloadAsStream(String url) throws Exception {  InputStream is = (InputStream) download(url, null, null, false);  return is; }  /**  *

下載後儲存到File

  *   * @param url  * @param saveFile  * @throws Exception  */ public static void download(String url, File saveFile) throws Exception {  download(url, saveFile, null, false); }  /**  *

下載

  *   * @param url  * @param saveFile  * @param params  * @param isPost  * @return 如果saveFile==null則回傳inputstream, 否則回傳saveFile  * @throws Exception  */ public static Object download(final String url, final File saveFile, final Map params,   final boolean isPost) throws Exception {   boolean saveToFile = saveFile != null;   // check dir exist ??  if (saveToFile && saveFile.getParentFile().exists() == false) {   saveFile.getParentFile().mkdirs();  }   Exception err = null;  HttpRequestBase request = null;  HttpResponse response = null;  HttpEntity entity = null;  FileOutputStream fos = null;  Object result = null;   try {   // create request   if (isPost) {    request = new HttpPost(url);   } else {    request = new HttpGet(url);   }    // add header & params   addHeaderAndParams(request, params);    // connect   response = httpclient.execute(request);   entity = response.getEntity();   entity = new BufferedHttpEntity(entity);    // get result   if (saveToFile) {// save to disk    fos = new FileOutputStream(saveFile);    IOUtils.copy(entity.getContent(), fos);    result = saveFile;   } else { // warp to inpustream    result = new BufferedInputStream(entity.getContent());   }   } catch (Exception e) {   err = e;  } finally {    // close   IOUtils.closeQuietly(fos);    // clear   request = null;   response = null;   entity = null;    if (err != null) {    throw err;   }    return result;  }  }  protected static void addHeaderAndParams(final HttpRequestBase request, final Map params) {  // add default header  request.addHeader("User-Agent", userAgent);   // add params  if (params != null) {    // map --> HttpParams   BasicHttpParams myParams = new BasicHttpParams();   for (String key : params.keySet()) {    myParams.setParameter(key, params.get(key));   }    request.setParams(myParams);  } }  public static HttpClient getHttpclient() {  return httpclient; }  public static void setHttpclient(HttpClient httpclient) {  HttpClientUtil.httpclient = httpclient; }  public static int getMaxTotal() {  return maxTotal; }  public static void setMaxTotal(int maxTotal) {  HttpClientUtil.maxTotal = maxTotal; }  public static int getMaxPerRoute() {  return maxPerRoute; }  public static void setMaxPerRoute(int maxPerRoute) {  HttpClientUtil.maxPerRoute = maxPerRoute; }  public static String getUserAgent() {  return userAgent; }  public static void setUserAgent(String userAgent) {  HttpClientUtil.userAgent = userAgent; }}

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