Java 遇到无效字符“�”
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Invalid character '�' encountered
提问by iOSDev
I am getting following exception while parsing the xml.
解析xml时出现以下异常。
Fatal error at line -1 Invalid character '�' encountered. No stack trace
I have Xml data in string format and I am parsing it using DOM parser. I am parsing data which is a response from Java server to a Blackberry client. I also tried parsing with SAX parser,but problem is not resolved. Please help.
我有字符串格式的 Xml 数据，我正在使用 DOM 解析器解析它。我正在解析数据，这是从 Java 服务器到 Blackberry 客户端的响应。我也试过用 SAX 解析器解析，但问题没有解决。请帮忙。
采纳答案by iOSDev
I got the solution,
我得到了解决方案，
I just trimmed it with trim() and it worked perfectly fine with me.
我只是用 trim() 修剪它，它对我来说效果很好。
回答by iOSDev
InputStream xml = new ByteArrayInputStream(xmlData.getBytes());
DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
Document doc = docBuilder.parse(xml);
doc.getDocumentElement().normalize();
xml.close();
Above is the code I am using for parsing.
以上是我用于解析的代码。
回答by Jon Skeet
Your code currently calls getBytes()using the platform default encoding - that's very rarely a good idea. Find out what the encoding of the data really is, and use that. (It's likely to be UTF-8.)
您的代码当前getBytes()使用平台默认编码进行调用- 这很少是一个好主意。找出数据的真正编码是什么，然后使用它。（很可能是 UTF-8。）
If the Blackberry includes DocumentBuilder.parse(InputSource), that would be preferable:
如果黑莓包括DocumentBuilder.parse(InputSource)，那将是可取的：
DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
StringReader reader = new StringReader(xmlData);
try {
Document doc = docBuilder.parse(xml);
doc.getDocumentElement().normalize();
} finally {
reader.close();
}
If that doesn't work, have a veryclose look at your string, e.g. like this:
如果不工作，有一个非常在你的字符串，例如，像这样近距离观察：
for (int i=0; i < xmlData.length(); i++) {
// Use whatever logging you have on the Blackberry
System.out.println((int) xmlData.charAt(i));
}
It's possible that the problem is reading the response from the server - if you're reading it badly, you could have Unicode nulls (\u0000) in your string, which may not appear obviously in log/debug output, but would cause the error you've shown.
问题可能出在从服务器读取响应 - 如果您读取的响应不好，您的字符串中可能有 Unicode 空值 (\u0000)，这可能不会在日志/调试输出中明显出现，但会导致错误你已经展示过了。
EDIT: I've just seen that you're getting the base64 data in the first place - so why convert it to a string and then back to bytes? Just decode the base64 to a byte array and then use that as the basis of your ByteArrayInputStream. Then you never have to deal with a text encoding in the first place.
编辑：我刚刚看到您首先获得了 base64 数据-那么为什么要将其转换为字符串然后再转换回字节呢？只需将 base64 解码为字节数组，然后将其用作ByteArrayInputStream. 那么你永远不必首先处理文本编码。
回答by Thorbj?rn Ravn Andersen
You have a null character in your character stream, i.e. char(0) which is not valid in an XML-document. If this is not present in the original string, then it is most likely a character decoding issue.
您的字符流中有一个空字符，即在 XML 文档中无效的 char(0)。如果这在原始字符串中不存在，则很可能是字符解码问题。
