「無效字節1 1字節的UTF-8序列」 當讀取RSS饋送

Question

我的代碼是同上簡單：

DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder(); 
Document doc = db.parse("http://blog.rogermontgomery.com/feed/?cat=skaffold"); 

的問題是，我有連接異常結束：

com.sun.org.apache.xerces.internal.impl.io.MalformedByteSequenceException: Invalid byte 1 of 1-byte UTF-8 sequence. 
    at com.sun.org.apache.xerces.internal.impl.io.UTF8Reader.invalidByte(UTF8Reader.java:684) 
    at com.sun.org.apache.xerces.internal.impl.io.UTF8Reader.read(UTF8Reader.java:554) 
    at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.load(XMLEntityScanner.java:1742) 
    at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.arrangeCapacity(XMLEntityScanner.java:1619) 
    at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.skipString(XMLEntityScanner.java:1657) 
    at com.sun.org.apache.xerces.internal.impl.XMLVersionDetector.determineDocVersion(XMLVersionDetector.java:193) 
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:772) 
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737) 
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:119) 
    at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:232) 
    at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:284) 
    at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:180) 
    at com.skaffold.service.RogerBlogReader.read(RogerBlogReader.java:33) 
[...] 

我不明白，XML標頭聲明文件爲UTF-8，HTTP響應編碼爲UTF-8 ... 任何解釋？

Answer 1

並非所有的字節序列都是有效的UTF-8。 UTF-8解碼器可以讀取單個字節，並根據字節值知道它在UTF-8中是非法的。這聽起來像你有一個不好的RSS提要，也許是一個聲稱是UTF-8，但實際上編碼不同，如iso8859-1。

更新：提要URL是gzip壓縮的。你嘗試過解壓嗎？