JSON_pohja_junat.java

package fi.academy.json.esimerkki;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.type.CollectionType;

import java.net.URL;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

/*
Vaatii Jackson kirjaston:
File | Project Structure
Libraries >> Add >> Maven
Etsi "jackson-databind", valitse esimerkiksi versio 2.0.5
Asentuu Jacksonin databind, sekä core ja annotations
 */

public class JSON_pohja_junat {
    public static void main(String[] args) {
        lueJunanJSONData();
    }


    private static void lueJunanJSONData() {
        String baseurl = "https://rata.digitraffic.fi/api/v1";
        try {
            URL url = new URL(URI.create(String.format("%s/live-trains/station/HKI/LH", baseurl)).toASCIIString());
            ObjectMapper mapper = new ObjectMapper();
            CollectionType tarkempiListanTyyppi = mapper.getTypeFactory().constructCollectionType(ArrayList.class, Juna.class);
            List<Juna> junat = mapper.readValue(url, tarkempiListanTyyppi);  // pelkkä List.class ei riitä tyypiksi
            System.out.println(junat.get(0).getTrainNumber());

            // Seuraavaa varten on toteutettava TimeTableRow luokka:
            //System.out.println(junat.get(0).getTimeTableRows().get(0).getScheduledTime());
            System.out.println("\n\n");
            System.out.println(junat.get(0));

        } catch (Exception ex) {
            System.out.println(ex);
        }
    }

}


class Juna {
    boolean cancelled;
    String commuterLineID;
    //LocalDate departureDate;  // Jackson ei oikein pidä Java 8 päivistä oletuksena
    Date departureDate;
    String operatorShortCode;
    int operatorUICCode;
    boolean runningCurrently;
    List<TimeTableRow> timeTableRows;
    Date timetableAcceptanceDate;
    String timetableType;
    String trainCategory;
    int trainNumber;
    String trainType;
    long version;

    @Override
    public String toString() {
        return "Juna{" + "cancelled=" + cancelled + ", commuterLineID='" + commuterLineID + '\'' + ", departureDate=" + departureDate + ", operatorShortCode='" + operatorShortCode + '\'' + ", operatorUICCode=" + operatorUICCode + ", runningCurrently=" + runningCurrently + ", timeTableRows=" + timeTableRows + ", timetableAcceptanceDate=" + timetableAcceptanceDate + ", timetableType='" + timetableType + '\'' + ", trainCategory='" + trainCategory + '\'' + ", trainNumber=" + trainNumber + ", trainType='" + trainType + '\'' + ", version=" + version + '}';
    }

    public boolean isCancelled() {
        return cancelled;
    }

    public void setCancelled(boolean cancelled) {
        this.cancelled = cancelled;
    }

    public String getCommuterLineID() {
        return commuterLineID;
    }

    public void setCommuterLineID(String commuterLineID) {
        this.commuterLineID = commuterLineID;
    }

    public Date getDepartureDate() {
        return departureDate;
    }

    public void setDepartureDate(Date departureDate) {
        this.departureDate = departureDate;
    }

    public String getOperatorShortCode() {
        return operatorShortCode;
    }

    public void setOperatorShortCode(String operatorShortCode) {
        this.operatorShortCode = operatorShortCode;
    }

    public int getOperatorUICCode() {
        return operatorUICCode;
    }

    public void setOperatorUICCode(int operatorUICCode) {
        this.operatorUICCode = operatorUICCode;
    }

    public boolean isRunningCurrently() {
        return runningCurrently;
    }

    public void setRunningCurrently(boolean runningCurrently) {
        this.runningCurrently = runningCurrently;
    }

    public List<TimeTableRow> getTimeTableRows() {
        return timeTableRows;
    }

    public void setTimeTableRows(List<TimeTableRow> timeTableRows) {
        this.timeTableRows = timeTableRows;
    }

    public Date getTimetableAcceptanceDate() {
        return timetableAcceptanceDate;
    }

    public void setTimetableAcceptanceDate(Date timetableAcceptanceDate) {
        this.timetableAcceptanceDate = timetableAcceptanceDate;
    }

    public String getTimetableType() {
        return timetableType;
    }

    public void setTimetableType(String timetableType) {
        this.timetableType = timetableType;
    }

    public String getTrainCategory() {
        return trainCategory;
    }

    public void setTrainCategory(String trainCategory) {
        this.trainCategory = trainCategory;
    }

    public int getTrainNumber() {
        return trainNumber;
    }

    public void setTrainNumber(int trainNumber) {
        this.trainNumber = trainNumber;
    }

    public String getTrainType() {
        return trainType;
    }

    public void setTrainType(String trainType) {
        this.trainType = trainType;
    }

    public long getVersion() {
        return version;
    }

    public void setVersion(long version) {
        this.version = version;
    }
}

@JsonIgnoreProperties(ignoreUnknown = true)

class TimeTableRow {

}