由于谷歌翻译官方api是付费版本，本着免费和开源的精神，分享一下用c#实现谷歌翻译api的代码。这个代码非常简单，主要分两块：通过webrequest的方式请求内容；获取get方式的请求参数（难点在于tk的获取）。
一、webrequest代码
var webrequest = webrequest.create(url) as httpwebrequest;
webrequest.method = "get" ;
webrequest.cookiecontainer = cookie;
webrequest.referer = referer;
webrequest.timeout = 20000;
webrequest.headers.add( "x-requested-with:xmlhttprequest" );
webrequest.accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8" ;
webrequest.useragent = useragent;
using (var webresponse = (httpwebresponse)webrequest.getresponse())
{
using (var reader = new streamreader(webresponse.getresponsestream(), encoding.utf8))
{
html = reader.readtoend();
reader.close();
webresponse.close();
}
}
二、谷歌翻译接口的实现
1、抓包查看翻译网络请求，这里是用谷歌浏览器查看的网络请求，如下图：
可以看到，请求方式是[get]方式，后面跟的请求参数很多，如下图：
其中，最重要的参数有：sl--来源语言，一般设置为auto即自动检测，tl--目标语言，你想翻译成的语言，tk--ticket即使发车车票，谷歌就靠这个来防止我们免费调用的，这是本api最难的地方。
2、tk的获取
在打开页面是，获取到的html代码中有如下一个生成tkk的脚本：
直接运行这个脚本，可以生成一个字符串：
从监控的网络中可以发现其中一个js调用了这个tkk值，这个js加了密进行混淆的，要破解这个js需要扎实的基本功，以及足够的耐心，我也是网上找的别人破解的js代码，亲测可用，需将此代码保存在gettk.js文档中，方便调用：
var b = function (a, b) {
for (var d = 0; d < b.length - 2; d += 3) {
var c = b.charat(d + 2),
c = "a" <= c ? c.charcodeat(0) - 87 : number(c),
c = "+" == b.charat(d + 1) ? a >>> c : a << c;
a = "+" == b.charat(d) ? a + c & 4294967295 : a ^ c
}
return a
}
var tk = function (a,tkk) {
for (var e = tkk.split( "." ), h = number(e[0]) || 0, g = [], d = 0, f = 0; f < a.length; f++) {
var c = a.charcodeat(f);
128 > c ? g[d++] = c : (2048 > c ? g[d++] = c >> 6 | 192 : (55296 == (c & 64512) && f + 1 < a.length && 56320 == (a.charcodeat(f + 1) & 64512) ? (c = 65536 + ((c & 1023) << 10) + (a.charcodeat(++f) & 1023), g[d++] = c >> 18 | 240, g[d++] = c >> 12 & 63 | 128) : g[d++] = c >> 12 | 224, g[d++] = c >> 6 & 63 | 128), g[d++] = c & 63 | 128)
}
a = h;
for (d = 0; d < g.length; d++) a += g[d], a = b(a, "+-a^+6" );
a = b(a, "+-3^+b+-f" );
a ^= number(e[1]) || 0;
0 > a && (a = (a & 2147483647) + 2147483648);
a %= 1e6;
return a.tostring() + "." + (a ^ h)
}
要得到tk只需要，运行tk这个函数，它有两个输入值：a为翻译文本内容，tkk是上文正则匹配得到的js字符串执行的结果值。为方便在c#中执行js，封装了一个能执行js的函数，如下：
/// <summary>
/// 执行js
/// </summary>
/// <param name="sexpression">参数体</param>
/// <param name="scode">javascript代码的字符串</param>
/// <returns></returns>
private string executescript( string sexpression, string scode)
{
msscriptcontrol.scriptcontrol scriptcontrol = new msscriptcontrol.scriptcontrol();
scriptcontrol.usesafesubset = true ;
scriptcontrol.language = "jscript" ;
scriptcontrol.addcode(scode);
try
{
string str = scriptcontrol.eval(sexpression).tostring();
return str;
}
catch (exception ex)
{
string str = ex.message;
}
return null ;
}
3、实现翻译的完整代码
/// <summary>
/// 谷歌翻译
/// </summary>
/// <param name="text">待翻译文本</param>
/// <param name="fromlanguage">自动检测：auto</param>
/// <param name="tolanguage">中文：zh-cn，英文：en</param>
/// <returns>翻译后文本</returns>
public string googletranslate( string text, string fromlanguage, string tolanguage)
{
cookiecontainer cc = new cookiecontainer();
string googletransbaseurl = "https://translate.google测试数据/" ;
var baseresulthtml = getresulthtml(googletransbaseurl, cc, "" );
regex re = new regex( @"(?<=tkk=)(.*?)(?=\);)" );
var tkkstr = re.match(baseresulthtml).tostring() + ")" ; //在返回的html中正则匹配tkk的js代码
var tkk = executescript(tkkstr, tkkstr); //执行tkk代码，得到tkk值
var gettkkjs = file.readalltext( "./gettk.js" );
var tk = executescript( "tk(\"" +text+ "\",\"" +tkk+ "\")" , gettkkjs);
string googletransurl = "https://translate.google测试数据/translate_a/single?client=t&sl=" +fromlanguage+ "&tl=" +tolanguage+ "&hl=en&dt=at&dt=bd&dt=ex&dt=ld&dt=md&dt=qca&dt=rw&dt=rm&dt=ss&dt=t&ie=utf-8&oe=utf-8&otf=1&ssel=0&tsel=0&kc=1&tk=" +tk+ "&q=" +httputility.urlencode(text);
var resulthtml = getresulthtml(googletransurl, cc, "https://translate.google测试数据/" );
dynamic tempresult = newtonsoft.json.jsonconvert.deserializeobject(resulthtml);
string resulttext = convert.tostring(tempresult[0][0][0]);
return resulttext;
}
public string getresulthtml( string url,cookiecontainer cc, string refer)
{
var html= "" ;
var webrequest = webrequest.create(url) as httpwebrequest;
webrequest.method = "get" ;
webrequest.cookiecontainer = cookie;
webrequest.referer = referer;
webrequest.timeout = 20000;
webrequest.headers.add( "x-requested-with:xmlhttprequest" );
webrequest.accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8" ;
webrequest.useragent = useragent;
using (var webresponse = (httpwebresponse)webrequest.getresponse())
{
using (var reader = new streamreader(webresponse.getresponsestream(), encoding.utf8))
{
html = reader.readtoend();
reader.close();
webresponse.close();
}
}
return html;
}
/// <summary>
/// 执行js
/// </summary>
/// <param name="sexpression">参数体</param>
/// <param name="scode">javascript代码的字符串</param>
/// <returns></returns>
private string executescript( string sexpression, string scode)
{
msscriptcontrol.scriptcontrol scriptcontrol = new msscriptcontrol.scriptcontrol();
scriptcontrol.usesafesubset = true ;
scriptcontrol.language = "jscript" ;
scriptcontrol.addcode(scode);
try
{
string str = scriptcontrol.eval(sexpression).tostring();
return str;
}
catch (exception ex)
{
string str = ex.message;
}
return null ;
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://HdhCmsTestcnblogs测试数据/marso/p/google_translate_api.html?utm_source=tuicool&utm_medium=referral
dy("nrwz");