java.lang.IllegalArgumentException：不支持：缩进号
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java.lang.IllegalArgumentException: Not supported: indent-number
提问by senzacionale
public String filter(String message) {
if (message == null) {
return null;
}
// Remove formatting, transformer fails to handle wrong indentation correctly.
message = message.replaceAll(">\s*[\r\n]+\s*", ">");
message = message.replaceAll("\s*[\r\n]+\s*", " "); // for wrapped attribute lists
Source xmlInput = new StreamSource(new StringReader(message));
StringWriter stringWriter = new StringWriter();
try {
TransformerFactory transformerFactory = TransformerFactory.newInstance();
transformerFactory.setAttribute("indent-number", INDENT); // for Java 6
Transformer transformer = transformerFactory.newTransformer();
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", INDENT.toString()); // Java 1.5
transformer.transform(xmlInput, new StreamResult(stringWriter));
String pretty = stringWriter.toString();
pretty = pretty.replace("\r\n", "\n");
return pretty;
} catch (TransformerException e) {
if (e.getCause() != null && e.getCause() instanceof SAXParseException) {
return message;
}
throw new RuntimeException(e);
}
}
but i get exception here:
但我在这里得到了例外：
transformerFactory.setAttribute("indent-number", INDENT); // for Java 6
java.lang.IllegalArgumentException: Not supported: indent-number
java.lang.IllegalArgumentException：不支持：缩进号
my java:
我的爪哇：
java version "1.6.0_33"
why i get this error?
为什么我收到这个错误？
回答by Dimitris
I fixed that exception by commenting this line:
我通过评论这一行来修复该异常：
transformerFactory.setAttribute("indent-number", indent);
and adding this line:
并添加这一行：
transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
The exception is gone even though the indetation that appears in the browser is incorrect.
即使浏览器中出现的 indetation 不正确，异常也消失了。
回答by Drakonoved
Instead of
代替
TransformerFactory transformerFactory = TransformerFactory.newInstance();
you should write
你应该写
TransformerFactory transformerFactory = new TransformerFactoryImpl();
because not all implementations of TransformerFactoryhave that field "indent-number".
因为并非所有的实现TransformerFactory都有那个字段"indent-number"。
回答by DataNucleus
Likely because Xalan (as packaged in JDK1.6/1.7) support "indent-number", yet others don't and have their own way of specifying the size of indent. So you have to put in the string appropriate for the XSLT provider. Work out which you're using and see its docs
可能是因为 Xalan（打包在 JDK1.6/1.7 中）支持“缩进数”，而其他人不支持并且有自己的方式来指定缩进的大小。因此，您必须输入适合 XSLT 提供程序的字符串。确定您正在使用哪个并查看其文档
Aren't standards that don't specify such things great?
不指定这些事情的标准不是很好吗？
回答by Perception
You should use the predefined constant OutputKeys.INDENT, or if you really insist on hardcoding the value, it should be 'indent', not 'indent-number'.
你应该使用预定义的常量OutputKeys.INDENT，或者如果你真的坚持对值进行硬编码，它应该是'indent'，而不是'indent-number'。
