我正在尝试从 Youtubeinmp3.com 下载给定 youtube 文件的 MP3 文件
有时它工作得很好，有时 API 返回一个 HTTP 文档而不是 JSON 对象。我尝试借助 foreach 循环和 getAudioLink 函数向 API 发送不同的请求，如下面的代码所示。 我的 musicTitle 对象包含三个字符串(VideoID、VideoTitle 和 ThumbnailURL)。所有这些都存储在每次我开始搜索时创建的列表中。
但我不知道为什么 API 有时会返回 HTTP 文档而不是 JSON 对象。我得到的错误代码是通过解析 HTTP 文档触发的，也可以在下面看到。
public static void main(String[] args)
{
....
for (MusicTitle musicTitle : myList)
{
System.out.println(getAudioLink(YOUTUBE_URL_C + musicTitle.getVideoID()));
}
}
public static String getAudioLink(String inputLink)
{
String result = null;
HttpURLConnection request = null;
URL url = null;
try
{
url = new URL("http://YoutubeInMP3.com/fetch/?format=JSON&video=" + inputLink);
System.out.println(url.toString());
request = (HttpURLConnection) url.openConnection();
request.connect();
InputStreamReader reader = new InputStreamReader((InputStream)request.getContent());
JsonParser jsonParser = new JsonParser(); // GSON-Library
JsonObject youtubeInMP3 = (JsonObject)jsonParser.parse(reader).getAsJsonObject();
if (youtubeInMP3 != null)
{
result = youtubeInMP3.get("link").getAsString();
}
request.disconnect();
reader.close();
}
catch (MalformedURLException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
return result;
}
错误代码:
Exception in thread "main" com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 12 path $
at com.google.gson.JsonParser.parse(JsonParser.java:65)
at Main.getAudioLink(Main.java:51)
at Main.main(Main.java:30)
Caused by: com.google.gson.stream.MalformedJsonException: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 12 path $
at com.google.gson.stream.JsonReader.syntaxError(JsonReader.java:1573)
at com.google.gson.stream.JsonReader.checkLenient(JsonReader.java:1423)
at com.google.gson.stream.JsonReader.doPeek(JsonReader.java:546)
at com.google.gson.stream.JsonReader.peek(JsonReader.java:429)
at com.google.gson.JsonParser.parse(JsonParser.java:60)
... 2 more
编辑 1
例如，如果我搜索乐队“Volbeat”，它会返回如下所示的 HTTP 文档。
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Your MP3 Is Ready</title>
<meta name="description" content="Download and alternatively edit your YouTube video before saving the MP3 on your device." />
<meta name="keywords" content="edit, download, convert, youtube, mp3" />
<meta name="author" content="YouTube In MP3" />
<meta name="distribution" content="global">
<meta name="language" content="en" />
<link rel="stylesheet" type="text/css" href="/css/style.css?v=1.2.2">
<link href='http://fonts.googleapis.com/css?family=Open+Sans:400,400italic|Roboto' rel='stylesheet' type='text/css'>
<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/font-awesome/4.4.0/css/font-awesome.min.css">
<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body class="home">
<div id="fb-root"></div>
<script>(function(d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) return;
js = d.createElement(s); js.id = id;
js.src = "//connect.facebook.net/en_US/sdk.js#xfbml=1&version=v2.5";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));</script>
<header>
<p><a href="/"><img src="/images/icon.png" class="verticalAlign" alt="YouTube In MP3 Icon"> <span class="logoText">YouTubeInMP3.com</span></a></p>
<nav>
<ul>
<li><a><i class="fa fa-bars fa-2x verticalAlign"></i> Menu</a>
<ul>
<li><a href="/blog/">Blog</a></li>
<li><a href="/faq/">FAQ</a></li>
<li><a href="/tos/">Terms of Service</a></li>
<li><a href="/privacy/">Privacy Policy</a></li>
</ul>
</li>
<li><a href="/api/"><i class="fa fa-cog fa-2x verticalAlign"></i> API</a></li>
<li><a href="/"><i class="fa fa-home fa-2x verticalAlign"></i> Home</a></li>
</ul>
</nav>
</header>
<div id="contain-160" class="ad ad-160 loader"></div>
<div class="link-popup" id="linkpopup">
<div class="popup">
<h2>Link to this MP3</h2>
<p><i class="fa fa-link fa-2x verticalAlign"></i> Direct Link:</p>
<code>http://www.youtubeinmp3.com/download/?video=https://www.youtube.com/watch?v=-2Y4t9elm_A</code>
<p><i class="fa fa-comment fa-2x verticalAlign"></i> Forum:</p>
<code>[url=http://www.youtubeinmp3.com/download/?video=https://www.youtube.com/watch?v=-2Y4t9elm_A]Download MP3 - Volbeat - Mary Ann's Place (Official Video)[/url]</code>
<p><i class="fa fa-code fa-2x verticalAlign"></i> HTML:</p>
<code><a href="http://www.youtubeinmp3.com/download/?video=https://www.youtube.com/watch?v=-2Y4t9elm_A">Download MP3 - Volbeat - Mary Ann's Place (Official Video)</a></code>
<a onclick="toggle_visibility('linkpopup');" class="close">×</a>
</div>
</div>
<div class="link-popup" id="editShow">
<div class="popup">
<div class="paddingBottomOptions">
<h2><i class="fa fa-scissors"></i> Cut MP3</h2>
<input placeholder="Cut From" class="cutMP3Slider" type="text" id="slider-margin-value-min" /> -
<input placeholder="Cut To" class="cutMP3Slider" type="text" id="slider-margin-value-max" /><br />
</div>
<div class="paddingBottomOptions">
<h2><i class="fa fa-eye"></i> Show video editor</h2>
<div class="checkBoxDiv">
Display Video Editor: <input class="checkBoxRight" type="checkbox" id="displayEditor"><br />
Always display Video Editor: <input class="checkBoxRight" type="checkbox" id="permanentDisplay">
</div>
</div>
<div class="paddingBottomOptions">
<h2><i class="fa fa-tag"></i> ID3 Tags</h2>
<div class="checkBoxDiv">
Identify ID3 Tags Automatically: <input checked="checked" disabled class="checkBoxRight" type="checkbox" id="autoID3">
</div>
</div>
<h2><i class="fa fa-font"></i> Change MP3 name</h2>
<input class="fullWidth" value="Volbeat - Mary Ann's Place (Official Video).mp3" placeholder="MP3 Name" type="text" id="customMP3Name" />
<a onclick="toggle_visibility('editShow');" class="close">×</a>
</div>
</div>
<div class="link-popup" id="shareShow">
<div class="popup">
<h2>Spread the word</h2>
<div class="socialButtons">
<a target="_blank" href="https://www.facebook.com/sharer/sharer.php?u=https://www.facebook.com/YouTubeInMP3com"><i class="fa fa-facebook-square fa-3x verticalAlign"></i></a>
<a target="_blank" href="https://twitter.com/intent/tweet?text=Simple way to extract audio and download MP3s from YouTube:&url=http://www.youtubeinmp3.com"><i class="fa fa-twitter-square fa-3x verticalAlign"></i></a>
<a target="_blank" href="http://pinterest.com/pin/create/button/?url=http://www.youtubeinmp3.com&description=Simple way to extract audio and download MP3s from YouTube&media=http://www.youtubeinmp3.com/images/icon.png"><i class="fa fa-pinterest-square fa-3x verticalAlign"></i></a>
<a target="_blank" href="https://plus.google.com/share?url=http://www.youtubeinmp3.com"><i class="fa fa-google-plus-square fa-3x verticalAlign"></i></a>
<a target="_blank" href="http://www.tumblr.com/share?v=3&u=http://www.youtubeinmp3.com&s=Simple way to extract audio and download MP3s from YouTube"><i class="fa fa-tumblr-square fa-3x verticalAlign"></i></a>
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var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) return;
js = d.createElement(s); js.id = id;
js.src = "//connect.facebook.net/en_US/sdk.js#xfbml=1&version=v2.5";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));</script>
<div class="fb-page" data-href="http://www.facebook.com/YouTubeInMP3com" data-small-header="false" data-adapt-container-width="true" data-hide-cover="false" data-show-facepile="false" data-show-posts="false"><div class="fb-xfbml-parse-ignore"><blockquote cite="http://www.facebook.com/YouTubeInMP3com"><a href="http://www.facebook.com/YouTubeInMP3com">YouTubeInMP3.com - Download MP3 Files From Youtube</a></blockquote></div></div>
</div>
<a onclick="toggle_visibility('shareShow');" class="close">×</a>
</div>
</div>
<section class="video">
<form id="form" action="" method="GET">
<input id="video" type="search" name="video" placeholder="Paste A Link Or Search For A Video Title" />
<!-- Small screen search results -->
<div id="searchResultMobile" class="searchResultMobile loader"></div>
<button id="searchButton" onclick="search()" type="submit"><i class="fa fa-search"></i> Convert To MP3</button>
<!-- Large screen search results -->
<div id="searchResultLarge" class="searchResultLarge loader"></div>
</form>
<link rel="stylesheet" property="stylesheet" type="text/css" href="//cdnjs.cloudflare.com/ajax/libs/noUiSlider/8.0.2/nouislider.min.css">
<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/noUiSlider/8.0.2/nouislider.js"></script>
<div class="embed loader">
<div id="player"></div>
<div id="slider"></div>
</div>
<div class="infoBox">
<h1 class="titleVideo"><img class="thumbnailTitle" alt="YouTube Thumbnail" src="http://img.youtube.com/vi/-2Y4t9elm_A/default.jpg"> Volbeat - Mary Ann's Place (Official Video)</h1>
<p class="floatLeft"><i class="fa fa-clock-o"></i> Length: <span class="bold">
|
<a target="_blank" href="https://www.facebook.com/sharer/sharer.php?u=https://www.facebook.com/YouTubeInMP3com"><i class="fa fa-facebook-square fa-2x verticalAlign"></i></a>
<a target="_blank" href="https://twitter.com/intent/tweet?text=Simple way to extract audio and download MP3s from YouTube:&url=http://www.youtubeinmp3.com"><i class="fa fa-twitter-square fa-2x verticalAlign"></i></a>
<a target="_blank" href="http://pinterest.com/pin/create/button/?url=http://www.youtubeinmp3.com&description=Simple way to extract audio and download MP3s from YouTube&media=http://www.youtubeinmp3.com/images/icon.png"><i class="fa fa-pinterest-square fa-2x verticalAlign"></i></a>
<a target="_blank" href="https://plus.google.com/share?url=http://www.youtubeinmp3.com"><i class="fa fa-google-plus-square fa-2x verticalAlign"></i></a>
<a target="_blank" href="http://www.tumblr.com/share?v=3&u=http://www.youtubeinmp3.com&s=Simple way to extract audio and download MP3s from YouTube"><i class="fa fa-tumblr-square fa-2x verticalAlign"></i></a>
<script src="/js/social.js" type="text/javascript"></script>
</p>
<div id="status">
</div>
<p class="download-buttons fullWidth">
<a class="button fullWidth" id="download" href="get/?i=6%2FARY3w4SlqKhP7hMpnw8skpb2vhQEwDg9rFg6URKpAEbyz736HFUpKqz6uO8TSy5YETAnmYwF995a0lNbbZLw%3D%3D"><i class="fa fa-download"></i> Convert & Download MP3</a>
<a onclick="toggle_visibility('editShow');" class="button button-gray"><i class="fa fa-cogs"></i> Settings</a><a rel="nofollow" href="http://www.youtubeinmp4.com/youtube.php?video=http://www.youtube.com/watch?v=-2Y4t9elm_A" class="button button-gray"><i class="fa fa-television"></i> Download in MP4 format</a><a rel="nofollow" href="http://www.saveitoffline.com/go/?l=http://www.saveitoffline.com/#http://www.youtube.com/watch?v=-2Y4t9elm_A" class="button button-gray"><i class="fa fa-file-o"></i> Other Formats</a>
</p>
<div id="contain-300" class="ad ad-300 loader"></div>
<div class="floatRight">
<div class="firstBlock">
<h2 class="firstBlockHeader">How do I download my MP3?</h2>
Your video has been prepared and is ready to be downloaded.<br />
To continue, simply press <strong>"Convert & Download MP3"</strong>.<br /><br />
Your MP3 has been converted to the highest quality possible and ID3 tags have been automatically identified and added.<br />
You can customize your download by changing the <a class="green" onclick="toggle_visibility('editShow');">Options</a>.<br />
</div>
<div class="secondBlock">
<h2 class="secondBlockHeader">How do I edit my MP3?</h2>
You can edit your MP3 by clicking "Settings" (grey button, found above on the left side) button.<br>
There are two ways of editing an MP3 before downloading it:<br>
<br>
1) Specify the start and end time manually, in the Settings menu.<br>
2) Enable the video editor from the Settings menu and use the sliders to set the start and end time.
</div>
</div>
</div>
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<script type="text/javascript">
var durationSeconds = 184;
var videoId = "-2Y4t9elm_A";
var editMin = '';
var editMax = '';
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编辑2
如果我搜索流行轨道或乐队，我会收到大约 12 个有效结果(共 15 个)。但是，如果我搜索没人会听的轨道，我会收到大约 15 个有效结果中的 1 个。
如果管理 YoutubeInMp3 API 信息的网络服务器(网络服务器)不知道轨道和相应的下载链接，是否有可能用 HTTP 文档进行应答？
编辑3
正如我所认为的问题是，网络服务器不知道轨道。如果我手动访问收到的 HTML 文档的链接，我需要确认轨道已转换。之后我可以在我的程序的帮助下手动下载它。
所以我猜 HTML 响应是一个线索，表明网络服务器对我的请求没有有效的答案。
最佳答案
... i dont know why the API sometimes returns a HTTP document
HTTP 文档很可能是某种错误报告。如果是这种情况，它(HTML 文档)应该为您提供一些线索，让您了解真正的问题是什么。
打印出 HTML。如果您无法弄清楚该报告的含义，请将其添加到您的问题中，以便我们为您提供帮助。
关于Java - HttpUrlConnection 包含 HTTP 文档而不是 JSON，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34652441/