在java 8中漂亮地打印XML
在java 8中漂亮地打印XML
提问于 2014-09-16 16:45:24
我有一个存储为DOM文档的XML文件，我想把它打印到控制台，最好不要使用外部库。我知道这个问题在这个网站上被问了很多次，但是之前的答案对我都不起作用。我使用的是java8，所以也许这就是我的代码与以前问题的不同之处？我还尝试使用从web上找到的代码手动设置转换器，但这只会导致not found错误。
下面是我的代码，它当前仅在控制台左侧的新行上输出每个xml元素。
import java.io.*;
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
public class Test {
public Test(){
try {
//java.lang.System.setProperty("javax.xml.transform.TransformerFactory", "org.apache.xalan.xsltc.trax.TransformerFactoryImpl");
DocumentBuilderFactory dbFactory;
DocumentBuilder dBuilder;
Document original = null;
try {
dbFactory = DocumentBuilderFactory.newInstance();
dBuilder = dbFactory.newDocumentBuilder();
original = dBuilder.parse(new InputSource(new InputStreamReader(new FileInputStream("xml Store - Copy.xml"))));
} catch (SAXException | IOException | ParserConfigurationException e) {
e.printStackTrace();
}
StringWriter stringWriter = new StringWriter();
StreamResult xmlOutput = new StreamResult(stringWriter);
TransformerFactory tf = TransformerFactory.newInstance();
//tf.setAttribute("indent-number", 2);
Transformer transformer = tf.newTransformer();
transformer.setOutputProperty(OutputKeys.METHOD, "xml");
transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
transformer.transform(new DOMSource(original), xmlOutput);
java.lang.System.out.println(xmlOutput.getWriter().toString());
} catch (Exception ex) {
throw new RuntimeException("Error converting to String", ex);
}
}
public static void main(String[] args){
new Test();
}
}回答 7
Stack Overflow用户
回答已采纳
发布于 2014-09-16 18:19:10
我猜这个问题与原始文件中的空白文本节点(即只包含空格的文本节点)有关。您应该尝试在解析之后立即以编程方式删除它们，使用以下代码。如果您不删除它们，Transformer将保留它们。
original.getDocumentElement().normalize();
XPathExpression xpath = XPathFactory.newInstance().newXPath().compile("//text()[normalize-space(.) = '']");
NodeList blankTextNodes = (NodeList) xpath.evaluate(original, XPathConstants.NODESET);
for (int i = 0; i < blankTextNodes.getLength(); i++) {
blankTextNodes.item(i).getParentNode().removeChild(blankTextNodes.item(i));
}Stack Overflow用户
发布于 2015-11-05 18:12:07
在回复Espinosa的评论时，这里有一个解决方案，当“原始xml没有(部分)缩进或包含新行”时。
背景
摘自激发此解决方案的文章(请参阅下面的参考资料)：
基于DOM规范，标记外部的空格是完全有效的，并且它们被正确地保留。要删除它们，我们可以使用XPath的normalize space来定位所有空格节点，并首先删除它们。
Java代码
public static String toPrettyString(String xml, int indent) {
try {
// Turn xml string into a document
Document document = DocumentBuilderFactory.newInstance()
.newDocumentBuilder()
.parse(new InputSource(new ByteArrayInputStream(xml.getBytes("utf-8"))));
// Remove whitespaces outside tags
document.normalize();
XPath xPath = XPathFactory.newInstance().newXPath();
NodeList nodeList = (NodeList) xPath.evaluate("//text()[normalize-space()='']",
document,
XPathConstants.NODESET);
for (int i = 0; i < nodeList.getLength(); ++i) {
Node node = nodeList.item(i);
node.getParentNode().removeChild(node);
}
// Setup pretty print options
TransformerFactory transformerFactory = TransformerFactory.newInstance();
transformerFactory.setAttribute("indent-number", indent);
Transformer transformer = transformerFactory.newTransformer();
transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
// Return pretty print xml string
StringWriter stringWriter = new StringWriter();
transformer.transform(new DOMSource(document), new StreamResult(stringWriter));
return stringWriter.toString();
} catch (Exception e) {
throw new RuntimeException(e);
}
}示例用法
String xml = "<root>" + //
"\n " + //
"\n<name>Coco Puff</name>" + //
"\n <total>10</total> </root>";
System.out.println(toPrettyString(xml, 4));输出
<root>
<name>Coco Puff</name>
<total>10</total>
</root>参考
MyShittyCode
上发布的
Stack Overflow用户
发布于 2014-09-16 17:33:58
这在Java 8上有效：
public static void main (String[] args) throws Exception {
String xmlString = "<hello><from>ME</from></hello>";
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
Document document = documentBuilder.parse(new InputSource(new StringReader(xmlString)));
pretty(document, System.out, 2);
}
private static void pretty(Document document, OutputStream outputStream, int indent) throws Exception {
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
if (indent > 0) {
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", Integer.toString(indent));
}
Result result = new StreamResult(outputStream);
Source source = new DOMSource(document);
transformer.transform(source, result);
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/25864316
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