java 從網址取得 json data 並解析

package test_4;

import org.json.*;
import java.net.*;
import java.io.*;
import static java.lang.System.out;
import java.util.*;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author xman
 */
public class T_1 {

    public static String getURLContent(String urlPath) throws MalformedURLException, IOException {
        String content = "";
        HttpURLConnection connection = null;
        BufferedReader in;

        URL url = null;

        url = new URL(urlPath);

        URLConnection urlConnection = url.openConnection();

        if (urlConnection instanceof HttpURLConnection) {
            connection = (HttpURLConnection) urlConnection;
        } else {
            System.out.println("请输入 URL 地址");
            return content;
        }
        in = new BufferedReader(
                new InputStreamReader(connection.getInputStream()));

        String current;
        while ((current = in.readLine()) != null) {
            content += current;
        }

        return content;
    }

    public static void main(String[] args) throws Exception {
        String htmlContent = getURLContent("http://localhost:8081/test_1/JSON/t_1.php");

        // out.println(htmlContent);
        JSONObject j;

        j = new JSONObject(htmlContent);

        Iterator<String> it = j.keys();;

        while (it.hasNext()) {
            String key = it.next();

            Object o_1 = j.get(key);
            out.printf("(%s)=>(%s)\n", key, o_1.toString());
        }
    }
}