Hübsches Druck-XML in Java

Sheeraz Gul 15 Februar 2024

Java Java XML

Pretty Print XML in der Konsole
Pretty Print XML in einer Datei

Hübsches Drucken des XML bedeutet, dass der XML-Code auf beabsichtigte Weise gedruckt wird. Dieses Tutorial zeigt, wie Sie XML in der Konsole und eine XML-Datei schön drucken.

Pretty Print XML in der Konsole

Das folgende Beispiel zeigt, wie Sie XML erstellen und in der Konsole hübsch drucken:

package delftstack;

import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

public class XML_Pretty_Print {
  public static void main(String[] args) {
    DocumentBuilderFactory Doc_Builder_Factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder Document_Builder;
    try {
      Document_Builder = Doc_Builder_Factory.newDocumentBuilder();
      Document document = Document_Builder.newDocument();
      // adding elements to Document
      Element Root_Element = document.createElementNS("https://www.delftstack.com/", "Tutorials");
      document.appendChild(Root_Element);

      // add a first child element to the root element
      Root_Element.appendChild(Get_Tutorial(document, "1",
          "Perform String to String Array Conversion in Java",
          "https://www.delftstack.com/howto/java/how-to-perform-string-to-string-array-conversion-in-java/",
          "Java", "May-21, 2020"));

      // add a second child
      Root_Element.appendChild(Get_Tutorial(document, "2", "Compile a C++ Program Using GCC",
          "https://www.delftstack.com/howto/cpp/gcc-compile-cpp/", "C++", "March-25, 2022"));
      // add third child
      Root_Element.appendChild(Get_Tutorial(document, "3", "Python Tutorial - Introduction",
          "https://www.delftstack.com/tutorial/python-3-basic-tutorial/python-introduction/",
          "Python", "January-29, 2018"));

      // create output
      TransformerFactory Transformer_Factory = TransformerFactory.newInstance();
      Transformer transformer = Transformer_Factory.newTransformer();
      // open indent for the xml code (Pretty Print)
      transformer.setOutputProperty(OutputKeys.INDENT, "yes");
      DOMSource Dom_Source = new DOMSource(document);

      // Pretty Print the XML to Console
      StreamResult XML_console = new StreamResult(System.out);
      transformer.transform(Dom_Source, XML_console);

    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  private static Node Get_Tutorial(Document document, String id, String article_name, String link,
      String programming_language, String date_created) {
    Element tutorial = document.createElement("Tutorial");

    // set the tutorial id attribute
    tutorial.setAttribute("Id", id);

    // create article name element
    tutorial.appendChild(Get_Tutorial_Elements(document, tutorial, "ArticleName", article_name));

    // create the Link element
    tutorial.appendChild(Get_Tutorial_Elements(document, tutorial, "Link", link));

    // create the Programming Language element
    tutorial.appendChild(
        Get_Tutorial_Elements(document, tutorial, "ProgrammingLanguage", programming_language));

    // create Date Created element
    tutorial.appendChild(Get_Tutorial_Elements(document, tutorial, "DateCreated", date_created));

    return tutorial;
  }

  // method to create text node
  private static Node Get_Tutorial_Elements(
      Document document, Element element, String element_name, String element_value) {
    Element element_node = document.createElement(element_name);
    element_node.appendChild(document.createTextNode(element_value));
    return element_node;
  }
}

Ausgang:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<Tutorials xmlns="https://www.delftstack.com/">
    <Tutorial Id="1">
        <ArticleName>Perform String to String Array Conversion in Java</ArticleName>
        <Link>https://www.delftstack.com/howto/java/how-to-perform-string-to-string-array-conversion-in-java/</Link>
        <ProgrammingLanguage>Java</ProgrammingLanguage>
        <DateCreated>May-21, 2020</DateCreated>
    </Tutorial>
    <Tutorial Id="2">
        <ArticleName>Compile a C++ Program Using GCC</ArticleName>
        <Link>https://www.delftstack.com/howto/cpp/gcc-compile-cpp/</Link>
        <ProgrammingLanguage>C++</ProgrammingLanguage>
        <DateCreated>March-25, 2022</DateCreated>
    </Tutorial>
    <Tutorial Id="3">
        <ArticleName>Python Tutorial - Introduction</ArticleName>
        <Link>https://www.delftstack.com/tutorial/python-3-basic-tutorial/python-introduction/</Link>
        <ProgrammingLanguage>Python</ProgrammingLanguage>
        <DateCreated>January-29, 2018</DateCreated>
    </Tutorial>
</Tutorials>

Pretty Print XML in einer Datei

Um XML in einer Datei hübsch zu drucken, müssen wir eine XML-Datei erstellen und das XML in diese Datei schreiben, indem wir den hübsch drucken-Weg verwenden. Siehe Beispiel:

package delftstack;

import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

public class XML_Pretty_Print {
  public static void main(String[] args) {
    DocumentBuilderFactory Doc_Builder_Factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder Document_Builder;
    try {
      Document_Builder = Doc_Builder_Factory.newDocumentBuilder();
      Document document = Document_Builder.newDocument();
      // adding elements to Document
      Element Root_Element = document.createElementNS("https://www.delftstack.com/", "Tutorials");
      document.appendChild(Root_Element);

      // add a first child element to the root element
      Root_Element.appendChild(Get_Tutorial(document, "1",
          "Perform String to String Array Conversion in Java",
          "https://www.delftstack.com/howto/java/how-to-perform-string-to-string-array-conversion-in-java/",
          "Java", "May-21, 2020"));

      // add a second child
      Root_Element.appendChild(Get_Tutorial(document, "2", "Compile a C++ Program Using GCC",
          "https://www.delftstack.com/howto/cpp/gcc-compile-cpp/", "C++", "March-25, 2022"));
      // add third child
      Root_Element.appendChild(Get_Tutorial(document, "3", "Python Tutorial - Introduction",
          "https://www.delftstack.com/tutorial/python-3-basic-tutorial/python-introduction/",
          "Python", "January-29, 2018"));

      // create output
      TransformerFactory Transformer_Factory = TransformerFactory.newInstance();
      Transformer transformer = Transformer_Factory.newTransformer();
      // open indent for the xml code (Pretty Print)
      transformer.setOutputProperty(OutputKeys.INDENT, "yes");
      DOMSource Dom_Source = new DOMSource(document);

      // Create a file and write XML to it
      StreamResult XML_file = new StreamResult(new File("delftstack.xml"));
      // write data
      transformer.transform(Dom_Source, XML_file);

      System.out.println("The XML file has been Generated");

    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  private static Node Get_Tutorial(Document document, String id, String article_name, String link,
      String programming_language, String date_created) {
    Element tutorial = document.createElement("Tutorial");

    // set the tutorial id attribute
    tutorial.setAttribute("Id", id);

    // create article name element
    tutorial.appendChild(Get_Tutorial_Elements(document, tutorial, "ArticleName", article_name));

    // create the Link element
    tutorial.appendChild(Get_Tutorial_Elements(document, tutorial, "Link", link));

    // create the Programming Language element
    tutorial.appendChild(
        Get_Tutorial_Elements(document, tutorial, "ProgrammingLanguage", programming_language));

    // create Date Created element
    tutorial.appendChild(Get_Tutorial_Elements(document, tutorial, "DateCreated", date_created));

    return tutorial;
  }

  // method to create text node
  private static Node Get_Tutorial_Elements(
      Document document, Element element, String element_name, String element_value) {
    Element element_node = document.createElement(element_name);
    element_node.appendChild(document.createTextNode(element_value));
    return element_node;
  }
}

Der obige Code schreibt den XML-Code auf eine hübsche Druckweise in eine Datei.

Ausgang:

The XML file has been Generated

Hübsches Drucken von XML in Java

Autor: Sheeraz Gul

Sheeraz is a Doctorate fellow in Computer Science at Northwestern Polytechnical University, Xian, China. He has 7 years of Software Development experience in AI, Web, Database, and Desktop technologies. He writes tutorials in Java, PHP, Python, GoLang, R, etc., to help beginners learn the field of Computer Science.

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Pretty Print XML in der Konsole

Pretty Print XML in einer Datei

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