Java中如何格式化输出XML字符串_Java格式化输出XML字符串方法

import org.w3c.dom.Document;
import org.xml.sax.InputSource;
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 java.io.StringReader;
import java.io.StringWriter;

public class FormatXml {

    public static String formatXml(String xmlString) {
        try {
            // 解析字符串为Document
            DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
            Document document = builder.parse(new InputSource(new StringReader(xmlString)));

            // 配置Transformer进行格式化
            Transformer transformer = TransformerFactory.newInstance().newTransformer();
            transformer.setOutputProperty(OutputKeys.INDENT, "yes");
            transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");

            // 执行转换
            StringWriter writer = new StringWriter();
            transformer.transform(new DOMSource(document), new StreamResult(writer));

            return writer.toString();
        } catch (Exception e) {
            throw new RuntimeException("XML格式化失败", e);
        }
    }

    // 使用示例
    public static void main(String[] args) {
        String xml = "<root><child name=\"test\"/></root>";
        System.out.println(formatXml(xml));
    }
}