Java - Recuperar fichero xml RAW de fichero xml Comprimido Draw.io

<?xml version="1.0"?>

-<mxfile type="device" editor="www.draw.io" version="9.1.8" userAgent="Mozilla/5.0 (Windows NT 6.1; rv:61.0) Gecko/20100101 Firefox/61.0">

<diagram id="7e0a89b8-554c-2b80-1dc8-d5c74ca68de4" name="Page-1">7Ztdj9soFIZ/TS478neSy0maaS9aaaSRut2ritjEZouNhckk2V+/ .................

/xE0N38Aw==</diagram></mxfile>

<?xml version="1.0" encoding="UTF-8"?>

-<mxGraphModel shadow="0" math="0" background="#ffffff" pageHeight="850" pageWidth="1100" pageScale="1" page="1" fold="1" arrows="1" connect="1" tooltips="1" guides="1" gridSize="10" grid="1" dy="545" dx="1042">

-<root>

<mxCell id="0"/>

<mxCell id="1" parent="0"/>

......

......

......

<mxGeometry as="geometry" height="4" width="4" y="232" x="120"/>

</mxCell>

</root>

</mxGraphModel>

// programa para java > 8, inflar (Zlib) .XML de fichero salvado de draw.io , uso c> java LeeXMLZip Circuito.xml <-|

// idea inicial de https://www.mkyong.com/java/how-to-read-xml-file-in-java-dom-parser/

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.parsers.DocumentBuilder;

import org.w3c.dom.Document;

import org.w3c.dom.NodeList;

import org.w3c.dom.Node;

import org.w3c.dom.Element;

import java.nio.charset.StandardCharsets;

import java.util.Base64;

import java.io.File;

import java.io.BufferedReader;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.util.zip.* ;

public class LeeXMLZip {

	public static String decompress(byte[] compressed) throws IOException { // draw.io usa pako.js (basado en zlib port)

		ByteArrayInputStream bis = new ByteArrayInputStream(compressed);

		InflaterInputStream gis = new InflaterInputStream(bis); // para descomprimir ZLIB

		BufferedReader br = new BufferedReader(new InputStreamReader(gis, "UTF-8"));

		StringBuilder sb = new StringBuilder();

		String line;

		while((line = br.readLine()) != null) {

			sb.append(line);

		}

		br.close();

		gis.close();

		bis.close();

		return sb.toString();

	}

   public static String decode64(String value) throws Exception {

      byte[] decodedValue = Base64.getDecoder().decode(value);  // Basic Base64 decoding

      return new String(decodedValue, StandardCharsets.UTF_8);

   }

  public static void main(String argv[]) {

    try {

        for (String s: argv)

         {

//       System.out.println( s);

	 File fXmlFile = new File( s); // Fichero "Circuito.xml"

  	 DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();

	 DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();

	 Document doc = dBuilder.parse( fXmlFile);

	 doc.getDocumentElement().normalize();

//	 System.out.println("Raiz :" + doc.getDocumentElement().getNodeName());	// mxfile

	 NodeList nList = doc.getElementsByTagName("diagram");

	 for (int temp = 0; temp < nList.getLength(); temp++) {

		Node nNode = nList.item( temp);

//		System.out.println("\nCurrent Element :" + nNode.getNodeName()); // "diagram"

		if (nNode.getNodeType() == Node.ELEMENT_NODE) {

			Element eElement = (Element) nNode;

//			System.out.println("id =" + eElement.getAttribute("id")+" Texto="); // id =7e0a89b8-554c-2b80-1dc8-d5c74ca68de4

			String cuerpo = doc.getElementsByTagName("diagram").item(0).getTextContent(); // cuerpo

//			System.out.println( cuerpo);

                        byte[] decodedValue = Base64.getDecoder().decode( cuerpo);  // Base64 decoding string ascii to binary

//			System.out.println( decodedValue);

			String XmlUnzip= decompress( decodedValue );

//			System.out.println( XmlUnzip );

		}

	 }

        }

    } catch (Exception e) {

	e.printStackTrace();

    }

  }

}

if(n.getNodeType() == Node.ELEMENT_NODE) {

		String text = ((Element)n).getTextContent();

		byte bytes[] = Base64.getDecoder().decode(text);

		byte tmp[] = new byte[1024];

		Inflater decomp = new Inflater(true);

		decomp.setInput(bytes);

		decomp.inflate(tmp);

		System.out.println(new String(tmp));

		decomp.end();

	  }