[英]StAX XML formatting in Java
Is it possible using StAX (specifically woodstox) to format the output xml with newlines and tabs, ie in the form: 是否可以使用StAX(特别是woodstox)使用换行符和制表符格式化输出xml,即以下列形式:
<element1> <element2> someData </element2> </element1>
instead of: 代替:
<element1><element2>someData</element2></element1>
If this is not possible in woodstox, is there any other lightweight libs that can do this? 如果在woodstox中无法做到这一点,是否有其他轻量级库可以做到这一点?
There is com.sun.xml.txw2.output.IndentingXMLStreamWriter 有com.sun.xml.txw2.output.IndentingXMLStreamWriter
XMLOutputFactory xmlof = XMLOutputFactory.newInstance();
XMLStreamWriter writer = new IndentingXMLStreamWriter(xmlof.createXMLStreamWriter(out));
Via the JDK: transformer.setOutputProperty(OutputKeys.INDENT, "yes");
通过JDK:
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
. 。
If you're using the StAX cursor API, you can indent the output by wrapping the XMLStreamWriter in an indenting proxy . 如果您正在使用StAX游标API,则可以通过将XMLStreamWriter包装在缩进代理中来缩进输出。 I tried this in my own project and it worked nicely.
我在自己的项目中试过这个并且效果很好。
Using the JDK Transformer : 使用JDK Transformer :
public String transform(String xml) throws XMLStreamException, TransformerException
{
Transformer t = TransformerFactory.newInstance().newTransformer();
t.setOutputProperty(OutputKeys.INDENT, "yes");
t.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
Writer out = new StringWriter();
t.transform(new StreamSource(new StringReader(xml)), new StreamResult(out));
return out.toString();
}
Rather than relying on a com.sun...class that might go away (or get renamed com.oracle...class), I recommend downloading the StAX utility classes from java.net. 我建议从java.net下载StAX实用程序类 ,而不是依赖于可能会消失的com.sun ...类(或者重命名为com.oracle ...类)。 This package contains a IndentingXMLStreamWriter class that works nicely.
这个包包含一个可以很好地工作的IndentingXMLStreamWriter类。 (Source and javadoc are included in the download.)
(源代码和javadoc包含在下载中。)
How about StaxMate : StaxMate怎么样 :
http://www.cowtowncoder.com/blog/archives/2006/09/entry_21.html http://www.cowtowncoder.com/blog/archives/2006/09/entry_21.html
Works well with Woodstox, fast, low-memory usage (no in-memory tree built), and indents like so: 适用于Woodstox,快速,低内存使用(没有内置树构建),以及如下缩进:
SMOutputFactory sf = new SMOutputFactory(XMLOutputFactory.newInstance());
SMOutputDocument doc = sf.createOutputDocument(new FileOutputStream("output.xml"));
doc.setIndentation("\n ", 1, 2); // for unix linefeed, 2 spaces per level
// write doc like:
SMOutputElement root = doc.addElement("element1");
root.addElement("element2").addCharacters("someData");
doc.closeRoot(); // important, flushes, closes output
如果您正在使用迭代方法(XMLEventReader),那么在写入XML文件时,是否只能将新行'\\ n'字符附加到相关的XMLEvents?
Not sure about stax, but there was a recent discussion about pretty printing xml here 不确定stax,但最近有一个关于漂亮打印xml的讨论
pretty print xml from java 来自java的漂亮的打印xml
this was my attempt at a solution 这是我尝试解决的问题
How to pretty print XML from Java? 如何从Java中打印XML?
using the org.dom4j.io.OutputFormat.createPrettyPrint() method 使用org.dom4j.io.OutputFormat.createPrettyPrint()方法
With Spring Batch this requires a subclass since this JIRA BATCH-1867 使用Spring Batch,这需要一个子类,因为这个JIRA BATCH-1867
public class IndentingStaxEventItemWriter<T> extends StaxEventItemWriter<T> {
@Setter
@Getter
private boolean indenting = true;
@Override
protected XMLEventWriter createXmlEventWriter( XMLOutputFactory outputFactory, Writer writer) throws XMLStreamException {
if ( isIndenting() ) {
return new IndentingXMLEventWriter( super.createXmlEventWriter( outputFactory, writer ) );
}
else {
return super.createXmlEventWriter( outputFactory, writer );
}
}
}
But this requires an additionnal dependency because Spring Batch does not include the code to indent the StAX output: 但这需要一个额外的依赖,因为Spring Batch不包含缩进StAX输出的代码:
<dependency>
<groupId>net.java.dev.stax-utils</groupId>
<artifactId>stax-utils</artifactId>
<version>20070216</version>
</dependency>
if you are using XMLEventWriter, then an easier way to do that is: 如果您正在使用XMLEventWriter,那么更简单的方法是:
XMLOutputFactory outputFactory = XMLOutputFactory.newInstance();
XMLEventWriter writer = outputFactory.createXMLEventWriter(w);
XMLEventFactory eventFactory = XMLEventFactory.newInstance();
Characters newLine = eventFactory.createCharacters("\n");
writer.add(startRoot);
writer.add(newLine);
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