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
/**
* 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
*
* <pre>翻譯工具
* ps: 透過google translate
* </pre>
*
* @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 * = "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
/**
* <pre>google翻譯
* ps: 交由google自動判斷來源語系
* </pre>
*
* @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);
}
/**
* <pre>google翻譯</pre>
*
* @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;
}
}
/**
* <pre>google翻譯: 簡中-->繁中</pre>
*
* @param text
* @return
* @throws exception
*/
public static string cn2tw(final string text) throws exception {
return translate(text, china, *);
}
/**
* <pre>google翻譯: 繁中-->簡中</pre>
*
* @param text
* @return
* @throws exception
*/
public static string tw2cn(final string text) throws exception {
return translate(text, *, china);
}
/**
* <pre>google翻譯: 英文-->繁中</pre>
*
* @param text
* @return
* @throws exception
*/
public static string en2tw(final string text) throws exception {
return translate(text, english, *);
}
/**
* <pre>google翻譯: 繁中-->英文</pre>
*
* @param text
* @return
* @throws exception
*/
public static string tw2en(final string text) throws exception {
return translate(text, *, english);
}
/**
* <pre>google翻譯: 日文-->繁中</pre>
*
* @param text
* @return
* @throws exception
*/
public static string jp2tw(final string text) throws exception {
return translate(text, japan, *);
}
/**
* <pre>google翻譯: 繁中-->日</pre>
*
* @param text
* @return
* @throws exception
*/
public static string tw2jp(final string text) throws exception {
return translate(text, *, japan);
}
}
httpclientutil.java
/**
* 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);
}
}
/**
* <pre>下載後回傳inputstream</pre>
*
* @param url
* @return
* @throws exception
*/
public static inputstream downloadasstream(string url) throws exception {
inputstream is = (inputstream) download(url, null, null, false);
return is;
}
/**
* <pre>下載後儲存到file</pre>
*
* @param url
* @param savefile
* @throws exception
*/
public static void download(string url, file savefile) throws exception {
download(url, savefile, null, false);
}
/**
* <pre>下載</pre>
*
* @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<string, string> 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<string, string> 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;
}
}