Google 翻译API Demo

最新推荐文章于 2024-12-15 17:21:06 发布

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最新推荐文章于 2024-12-15 17:21:06 发布

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文章标签： java

本文介绍如何通过正则表达式匹配并使用Post方式调用Google翻译API实现中英互译，解决GET方式翻译内容长度限制问题，并提供了.NET版实现代码及下载链接。

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接上篇 Google翻译API(B/S调用和C/S调用)

上篇里提到的接口调用方法是get方式，这样有个问题，每次请求翻译的内容不能超过url允许的长度。需要改成post方式才行，但是google没有提供post方式的API请求，怎么办呢？在通过网上一番资料的查找，在一位哥们的博客里看到了解决方案，不过他用的是java版的，对应post地址和参数，写出了.net版的。加上朗读的功能，程序界面如下：

/// <summary> /// Post方式获取翻译 /// </summary> /// <param name="sourceText"></param> /// <param name="langPair"></param> /// <returns></returns> private static string TranslatePostMethod(string sourceText, string langPair) { string fromLan = langPair; //原始语言 string toLan = langPair.ToLower() == "zh" ? "en" : "zh"; //目标语言这里只针对中英互转 HttpWebRequest requestScore = (HttpWebRequest)WebRequest.Create("http://translate.google.com/translate_t#"); StringBuilder postContent = new StringBuilder(); Encoding myEncoding = Encoding.UTF8; postContent.Append(HttpUtility.UrlEncode("hl", myEncoding)); postContent.Append("="); postContent.Append(HttpUtility.UrlEncode("en", myEncoding)); postContent.Append("&"); postContent.Append(HttpUtility.UrlEncode("ie", myEncoding)); postContent.Append("="); postContent.Append(HttpUtility.UrlEncode("UTF-8", myEncoding)); postContent.Append("&"); postContent.Append(HttpUtility.UrlEncode("sl", myEncoding)); postContent.Append("="); postContent.Append(HttpUtility.UrlEncode(fromLan, myEncoding)); postContent.Append("&"); postContent.Append(HttpUtility.UrlEncode("text", myEncoding)); postContent.Append("="); postContent.Append(HttpUtility.UrlEncode(sourceText, myEncoding)); postContent.Append("&"); postContent.Append(HttpUtility.UrlEncode("tl", myEncoding)); postContent.Append("="); postContent.Append(HttpUtility.UrlEncode(toLan, myEncoding)); byte[] data = Encoding.ASCII.GetBytes(postContent.ToString()); requestScore.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)"; requestScore.Method = "Post"; //requestScore.ContentType = "application/x-www-form-urlencoded;charset=gb2312"; requestScore.ContentLength = data.Length; requestScore.KeepAlive = true; requestScore.Timeout = (6 * 60 * 1000); requestScore.ProtocolVersion = HttpVersion.Version10; Stream stream = requestScore.GetRequestStream(); stream.Write(data, 0, data.Length); stream.Close(); string content = string.Empty; try { System.Net.ServicePointManager.Expect100Continue = false; HttpWebResponse responseSorce = (HttpWebResponse)requestScore.GetResponse(); StreamReader reader = new StreamReader(responseSorce.GetResponseStream()); content = reader.ReadToEnd(); responseSorce.Close(); reader.Dispose(); stream.Dispose(); } catch (WebException ex) { HttpWebResponse responseSorce = (HttpWebResponse)ex.Response;//得到请求网站的详细错误提示 StreamReader reader = new StreamReader(responseSorce.GetResponseStream()); content = reader.ReadToEnd(); responseSorce.Close(); reader.Dispose(); stream.Dispose(); } finally { requestScore.Abort(); } string reg = @"<(?<HtmlTag>[\w]+)[^>]*\s[iI][dD]=(?<Quote>[""']?)result_box(?(Quote)\k<Quote>)[""']?[^>]*>((?<Nested><\k<HtmlTag>[^>]*>)|</\k<HtmlTag>>(?<-Nested>)|.*?)*</\k<HtmlTag>>"; //返回的是一个html页面，需匹配出翻译内容 Regex r = new Regex(reg); MatchCollection mcItem = r.Matches(content); string result = ConvertHtmlToText(mcItem[0].Value); return "post:" + result; }

可执行程序下载：http://download.youkuaiyun.com/source/3499399

源代码下载：http://download.youkuaiyun.com/source/3499392

参考资料：

1.Google翻译post提交无长度限制的在线翻译例子

2.使用正则表达式匹配嵌套Html标签

3.使用正则表达式将Html转换为纯文本