Get an XML list in JAVA

Question

Get an XML list in JAVA

Navigation

#1 by (0 votes)

2

I'm trying to get a list in XML but I can not put it in the variable.

Main class:

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;

public class Teste {

  private final String USER_AGENT = "Mozilla/5.0";

  public static void main(String[] args) throws Exception {

    Teste http = new Teste();

    System.out.println("Testing 1 - Send Http GET request");
    http.sendGet();

//      System.out.println("\nTesting 2 - Send Http POST request");
//      http.sendPost();
  }

  // HTTP GET request
  private void sendGet() throws Exception {

    String url = "http://www.teste.com/cars.xml";

    URL obj = new URL(url);
    HttpURLConnection con = (HttpURLConnection) obj.openConnection();

    // optional default is GET
    con.setRequestMethod("GET");

    //add request header
    con.setRequestProperty("User-Agent", USER_AGENT);

    int responseCode = con.getResponseCode();
    System.out.println("\nSending 'GET' request to URL : " + url);
    System.out.println("Response Code : " + responseCode);

    BufferedReader in = new BufferedReader(
            new InputStreamReader(con.getInputStream()));

    try {

      String message = org.apache.commons.io.IOUtils.toString(in);

      //Transforma xml em objeto
      JAXBContext aXBContext = JAXBContext.newInstance(Cars.class);
      Unmarshaller cu = aXBContext.createUnmarshaller();
      Cars cars = (Cars) cu.unmarshal(in);



      if(cars != null){
        System.out.println("Não é nulo!");
      }

    } catch (Exception e) {
      System.out.println(e.getMessage());
    }

  }
}

Cars class:

import java.util.ArrayList;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;


@XmlRootElement (name = "Cars")

public class Cars {
  private ArrayList<Car> cars = new ArrayList<>();

  public ArrayList<Car> getCars() {
    return cars;
  }

  @XmlElement
  public void setCars(ArrayList<Car> cars) {
    this.cars = cars;
  }

}

Car class:

import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "Car")
public class Car {

  private String manufacturerCar;
  private String modelCar;
  private String doorsCar;
  private String gearshift;

  public String getManufacturerCar() {
    return manufacturerCar;
  }

  @XmlElement
  public void setManufacturerCar(String manufacturerCar) {
    this.manufacturerCar = manufacturerCar;
  }

  public String getModelCar() {
    return modelCar;
  }

  @XmlElement
  public void setModelCar(String modelCar) {
    this.modelCar = modelCar;
  }

  public String getDoorsCar() {
    return doorsCar;
  }

  @XmlElement
  public void setDoorsCar(String doorsCar) {
    this.doorsCar = doorsCar;
  }

  public String getGearshift() {
    return gearshift;
  }

  @XmlElement
  public void setGearshift(String gearshift) {
    this.gearshift = gearshift;
  }

  @Override
  public String toString() {
    return "Car{" + "manufacturerCar=" + manufacturerCar + ", modelCar=" + modelCar + ", doorsCar=" + doorsCar + ", gearshift=" + gearshift + '}';
  }
}

And XML:

<Cars>
<Car>
<manufacturerCar>VW</manufacturerCar>
<modelCar>FUSCA</modelCar>
<doorsCar>2</doorsCar>
<gearshift>MANUAL</gearshift>
</Car>
<Car>
<manufacturerCar>FORD</manufacturerCar>
<modelCar>FOCUS</modelCar>
<doorsCar>4</doorsCar>
<gearshift>AUTOMATICO</gearshift>
</Car>
<Car>
<manufacturerCar>FIAT</manufacturerCar>
<modelCar>UNO</modelCar>
<doorsCar>4</doorsCar>
<gearshift>MANUAL</gearshift>
</Car>
<Car>
<manufacturerCar>VW</manufacturerCar>
<modelCar>UP!</modelCar>
<doorsCar>4</doorsCar>
<gearshift>AUTOMATICO</gearshift>
</Car>
<Car>
<manufacturerCar>PORSHE</manufacturerCar>
<modelCar>Q100</modelCar>
<doorsCar>2</doorsCar>
<gearshift>AUTOMATICO</gearshift>
</Car>
<Car>
<manufacturerCar>RENAULT</manufacturerCar>
<modelCar>DUSTER</modelCar>
<doorsCar>4</doorsCar>
<gearshift>Manual</gearshift>
</Car>
<Car>
<manufacturerCar>HONDA</manufacturerCar>
<modelCar>CIVIC</modelCar>
<doorsCar>4</doorsCar>
<gearshift>Manual</gearshift>
</Car>
<Car>
<manufacturerCar>MITSUBISHI</manufacturerCar>
<modelCar>PAJERO</modelCar>
<doorsCar>4</doorsCar>
<gearshift>Manual</gearshift>
</Car>
</Cars>

The variable cars ends up returning "Null".

java xml

asked by anonymous 29.09.2017 / 00:42

1 answer

Conditions on dates in MYSQL know the last record and penultimate Tinymce with Vuejs

score 0 · Accepted Answer

You are "consuming" the stream on the String message = org.apache.commons.io.IOUtils.toString(in); line.

When trying to do unmarshal Cars cars = (Cars) cu.unmarshal(in); The reading position of the stream is at the end of it, so no byte is returned.

You can comment on the String message = org.apache.commons.io.IOUtils.toString(in); line or use the message string in the unmarshal of the Cars class.

To solve the parse problem of the list, include the name of the element in the Cars entity:

import java.util.ArrayList;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;


@XmlRootElement (name = "Cars")

public class Cars {
    private ArrayList<Car> cars = new ArrayList<>();

    public ArrayList<Car> getCars() {
        return cars;
    }
    //Incluido o nome do elemento
    @XmlElement(name="Car")
    public void setCars(ArrayList<Car> cars) {
        this.cars = cars;
    }

}