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#12 - Java
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‎Roadmap/12 - JSON Y XML/java/Josegs95.java

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import com.fasterxml.jackson.core.JsonProcessingException;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import org.w3c.dom.Document;
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import org.w3c.dom.Element;
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import org.w3c.dom.Node;
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import org.w3c.dom.NodeList;
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import org.xml.sax.SAXException;
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import javax.xml.parsers.DocumentBuilder;
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import javax.xml.parsers.DocumentBuilderFactory;
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import javax.xml.parsers.ParserConfigurationException;
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import javax.xml.transform.*;
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import javax.xml.transform.dom.DOMSource;
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import javax.xml.transform.stream.StreamResult;
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import java.io.File;
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import java.io.IOException;
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import java.nio.file.Files;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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public class Josegs95 {
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private static final String XML_FILENAME = "Josegs95.xml";
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private static final String JSON_FILENAME = "Josegs95.json";
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public static void main(String[] args) {
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String name = "Jose";
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String age = "29";
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String birthdate = "28-02-1995";
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List<String> languageList = new ArrayList<>();
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languageList.add("Java");
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languageList.add("Python");
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Map<String, Object> dataMap = new HashMap<>();
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dataMap.put("name", name);
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dataMap.put("age", age);
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dataMap.put("birthdate", birthdate);
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dataMap.put("language_list", languageList);
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//El reto usa los archivos de los ejercicios XML y JSON, por eso la línea que borra
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//los ficheros está comentada.
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//XML
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exerciseXML(dataMap);
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//JSON
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exerciseJSON(dataMap);
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//Reto
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System.out.println("\n");
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retoFinal();
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}
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private static void exerciseXML(Map<String, Object> dataMap){
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try {
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//Creo el builder
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DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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DocumentBuilder builder = factory.newDocumentBuilder();
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//Obtengo el documento
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Document document = builder.newDocument();
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//Creo el elemento raiz
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Element root = document.createElement("datos");
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document.appendChild(root);
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//Creo los elementos para insertar los datos y los coloco bajo el elemento raiz
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for (Map.Entry<String, Object> entry : dataMap.entrySet()){
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Element element = document.createElement(entry.getKey());
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Object value = entry.getValue();
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if (value instanceof String)
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element.appendChild(document.createTextNode((String) value));
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else if (value instanceof List<?>){
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for (String itemText : ((List<String>) value)){
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Element itemElement = document.createElement("language");
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itemElement.appendChild(document.createTextNode(itemText));
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element.appendChild(itemElement);
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}
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} else
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continue;
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root.appendChild(element);
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}
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//Creo el objeto transformer y lo preparo para escribir el documento con el que hemos trabajado
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TransformerFactory transformerFactory = TransformerFactory.newInstance();
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Transformer transformer = transformerFactory.newTransformer();
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//transformer.setOutputProperty(OutputKeys.INDENT, "yes"); //Para ver de forma mas clara el XML
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DOMSource source = new DOMSource(document);
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//Escribo en el archivo con la ruta especificada
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File xmlFile = new File(XML_FILENAME);
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StreamResult result = new StreamResult(xmlFile);
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transformer.transform(source, result);
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//Leer el XML
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//Leemos el archivo de forma normal
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String xmlString = new String(Files.readAllBytes(xmlFile.toPath()));
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System.out.println(xmlString);
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//deleteFile(new File (XML_FILENAME));
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} catch (ParserConfigurationException e) {
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throw new RuntimeException(e);
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} catch (TransformerConfigurationException e) {
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throw new RuntimeException(e);
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} catch (TransformerException e) {
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throw new RuntimeException(e);
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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}
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private static void exerciseJSON(Map<String, Object> dataMap){
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try {
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File jsonFile = new File (JSON_FILENAME);
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ObjectMapper objectMapper = new ObjectMapper();
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//Escribir en el fichero un mapa en formato JSON
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//objectMapper.writeValue(jsonFile, dataMap);
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objectMapper.writerWithDefaultPrettyPrinter().writeValue(jsonFile, dataMap);
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//Recuperar los datos de un JSON y meterlos en un mapa
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Map<String, Object> newDataMap = new HashMap<>();
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newDataMap = objectMapper.readValue(jsonFile, newDataMap.getClass());
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System.out.println(newDataMap);
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//deleteFile(jsonFile);
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} catch (JsonProcessingException e) {
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throw new RuntimeException(e);
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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}
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private static void retoFinal(){
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//XML
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File xmlFile = new File(XML_FILENAME);
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DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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try {
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DocumentBuilder builder = factory.newDocumentBuilder();
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Document document = builder.parse(xmlFile);
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//document.getDocumentElement().normalize();
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String name = document.getElementsByTagName("name").item(0).getTextContent();
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String age = document.getElementsByTagName("age").item(0).getTextContent();
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String birthdate = document.getElementsByTagName("birthdate").item(0).getTextContent();
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List<String> languageList = new ArrayList<>();
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Node languagesNode = document.getElementsByTagName("language_list").item(0);
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NodeList languagesNodeList = languagesNode.getChildNodes();
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for (int i = 0; i < languagesNodeList.getLength(); i++){
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Node node = languagesNodeList.item(i);
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languageList.add(node.getTextContent());
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}
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Person personFromXML = new Person(name, age, birthdate, languageList);
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System.out.println("Persona XML = " + personFromXML);
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} catch (ParserConfigurationException e) {
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throw new RuntimeException(e);
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} catch (IOException e) {
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throw new RuntimeException(e);
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} catch (SAXException e) {
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throw new RuntimeException(e);
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}
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//JSON
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File jsonFile = new File (JSON_FILENAME);
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ObjectMapper objectMapper = new ObjectMapper();
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try {
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Map<String, Object> dataMap = new HashMap<>();
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dataMap = objectMapper.readValue(jsonFile, dataMap.getClass());
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String name = (String) dataMap.get("name");
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String age = (String) dataMap.get("age");
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String birthdate = (String) dataMap.get("birthdate");
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List<String> languageList = (List<String>) dataMap.get("language_list");
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Person personFromJSON = new Person(name, age, birthdate, languageList);
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System.out.println("Persona JSOM = " + personFromJSON);
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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deleteFile(xmlFile);
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deleteFile(jsonFile);
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}
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private static void deleteFile(File file){
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if (file.delete())
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System.out.println("Se ha borrado el archivo con éxito.");
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else
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System.out.println("No se ha podido borrar el archivo.");
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}
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public static class Person{
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private String name;
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private String age;
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private String birthdate;
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private List<String> languageList;
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public Person(String name, String age, String birthdate, List<String> languageList) {
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this.name = name;
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this.age = age;
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this.birthdate = birthdate;
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this.languageList = languageList;
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}
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public Person(){}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public String getAge() {
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return age;
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}
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public void setAge(String age) {
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this.age = age;
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}
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public String getBirthdate() {
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return birthdate;
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}
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public void setBirthdate(String birthdate) {
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this.birthdate = birthdate;
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}
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public List<String> getLanguageList() {
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return languageList;
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}
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public void setLanguageList(List<String> languageList) {
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this.languageList = languageList;
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}
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@Override
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public String toString() {
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return "Nombre: " + name +
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", Edad: " + age +
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", Fecha de nacimiento: " + birthdate +
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", Lista de lenguajes: " + languageList;
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}
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}
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}

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