OpenJDK 16.0.1
javac WriteXML.java
java WriteXML<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<people>
<person age="20" name="taro"/>
<person age="23" name="hanako"/>
<person age="16" name="foobar"/>
</people>
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December 23, 2021 14:47
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JavaでObjectからXMLを生成して標準出力に書き出す
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| import java.io.StringWriter; | |
| import java.io.IOException; | |
| import java.io.InputStream; | |
| import java.io.Writer; | |
| import java.util.ArrayList; | |
| import java.util.List; | |
| import javax.xml.parsers.DocumentBuilderFactory; | |
| import javax.xml.parsers.ParserConfigurationException; | |
| import javax.xml.transform.OutputKeys; | |
| import javax.xml.transform.TransformerConfigurationException; | |
| import javax.xml.transform.TransformerException; | |
| import javax.xml.transform.TransformerFactory; | |
| import javax.xml.transform.dom.DOMSource; | |
| import javax.xml.transform.stream.StreamResult; | |
| import org.w3c.dom.Element; | |
| import org.xml.sax.SAXException; | |
| public class WriteXML { | |
| public static void main(String... args) { | |
| List<Person> people = new ArrayList<>(); | |
| people.add(new Person("taro", 20)); | |
| people.add(new Person("hanako", 23)); | |
| people.add(new Person("foobar", 16)); | |
| try (Writer w = new StringWriter()) { | |
| writeXML(w, people); | |
| var s = w.toString(); | |
| System.out.println(s); | |
| } catch (Exception e) {} | |
| } | |
| private static void writeXML(Writer writer, List<Person> people) | |
| throws ParserConfigurationException, TransformerConfigurationException, TransformerException { | |
| var factory = DocumentBuilderFactory.newInstance(); | |
| var builder = factory.newDocumentBuilder(); | |
| var document = builder.newDocument(); | |
| var root = document.createElement("people"); | |
| document.appendChild(root); | |
| people.stream() | |
| .forEach( | |
| item -> { | |
| var elem = document.createElement("person"); | |
| elem.setAttribute("name", item.name); | |
| elem.setAttribute("age", "" + item.age); | |
| root.appendChild(elem); | |
| }); | |
| var transformerFactory = TransformerFactory.newInstance(); | |
| var transformer = transformerFactory.newTransformer(); | |
| var domSource = new DOMSource(document); | |
| var streamResult = new StreamResult(writer); | |
| transformer.setOutputProperty(OutputKeys.INDENT, "yes"); | |
| transformer.transform(domSource, streamResult); | |
| } | |
| } | |
| class Person { | |
| final String name; | |
| final int age; | |
| Person(String name, int age) { | |
| this.name = name; | |
| this.age = age; | |
| } | |
| } |
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