com.mycompany.mavenfirst.webManager.java Source code

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Here is the source code for com.mycompany.mavenfirst.webManager.java

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/*
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package com.mycompany.mavenfirst;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import javax.swing.JOptionPane;

/**
 *
 * @author w200880842
 */
public class webManager {

    public static String fetchData() {
        StringBuilder sb = new StringBuilder();
        try {

            URL url = new URL("http://www.w3schools.com/angular/customers.php");
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.setRequestProperty("Accept", "application/json");

            if (conn.getResponseCode() != 200) {
                throw new RuntimeException("Failed : HTTP error code : " + conn.getResponseCode());
            }

            BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));

            String output;

            System.out.println("Output from server ...\n");

            while ((output = br.readLine()) != null) {
                System.out.println(output);
                sb.append(output);
                JOptionPane.showMessageDialog(null, output);
            }
            conn.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return sb.toString();
    }

    public void jsonToJavaObject() {
        Gson gson = new GsonBuilder().create();
        String jsonData = "{name:\"Tom\",city:\"Houston\",country:\"USA\"}";
        Demographics p = gson.fromJson(jsonData, Demographics.class);
        JOptionPane.showMessageDialog(null, p);
        System.out.println(p.getName());
    }

    public void gsontoJsonArray() {
        String str = "[{\"name\":\"Tom\",\"city\":\"Houston\",\"country\":\"USA\"},\n"
                + "{\"name\":\"Ady\",\"city\":\"Melbourne\",\"country\":\"Australia\"}]";
        JsonElement json = new JsonParser().parse(str);
        JsonArray array = json.getAsJsonArray();
        Iterator iterator = array.iterator();
        List<Demographics> p = new ArrayList<>();
        while (iterator.hasNext()) {
            JsonObject json2 = (JsonObject) iterator.next();
            Gson gson = new Gson();
            Demographics v = gson.fromJson(json2, Demographics.class);
            p.add(v);
        }
        JOptionPane.showMessageDialog(null, p);
        System.out.println(p);
    }

    public static void main(String[] args) {
        webManager wm = new webManager();
        wm.jsonToJavaObject();
        wm.gsontoJsonArray();

    }

}