嗨，朋友们，我第一次尝试调用json，我需要一些帮助
我收到以下答复
“{，”restresponse“{，”messages“：[”找到的记录总数[249]，，”result“：[{，”name“：”afghanistan“，”alpha2\u code“：”af“，”alpha3\u code“：”afg“，}，{，”name“：”��陆地岛屿“，”alpha2\u code“：”ax“，”alpha3\u code“：”ala“，}，{，”name“：”albana“，”alpha2\u code“：”al“，”alpha3\u code“：”alb“，}，{，”name“：”algeria“，”alpha2\u code“：”dz“，”alpha2\u code“：”bh“，”alpha3\u code“：”bhr“，}，{
但我需要的响应键明智的或单独的项目，如名称或alpha2\u码值等，你可以帮我。下面是我的完整代码。

package com.group.portal.client.common.actions;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import org.apache.turbine.util.RunData;
import org.json.JSONObject;
import org.mozilla.javascript.json.JsonParser;
import antlr.collections.List;
    public class PaymentProcess extends AjaxAction {
public void doPerform(RunData data) throws Exception {
    data.getUser();
    JSONObject resultJSON = new JSONObject();       
    String msg = "This is Test Message";
    boolean error = false;
    Object object = null;
    try {
    URL url = new URL("http://services.groupkt.com/country/get/all");
    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())));
    ArrayList<String> response = new ArrayList<String>();
    StringBuilder sb = new StringBuilder();
        String output="";
        while ((output = br.readLine()) != null) {
            System.out.println(output);
            response.add(output);
        }
        resultJSON.put("msg",response.toArray(new String[0]));
        conn.disconnect();
    }
     catch (MalformedURLException e) {
            e.printStackTrace();
          } catch (IOException e) {
            e.printStackTrace();
          }
    data.getResponse().setHeader("Cache-Control",
            "max-age=0,no-cache,no-store,post-check=0,pre-check=0");
    data.getResponse()
            .setHeader("Expires", "Mon, 26 Jul 1997 05:00:00 GMT");
    data.getTemplateInfo()
            .setTemp(
    TechnicalResourceProvider.XML_HTTP_REQUEST_RESPONSE_CONTENT_TYPE,
                    "application/json; charset=utf-8");
    data.getTemplateInfo().setTemp(
            TechnicalResourceProvider.XML_HTTP_REQUEST_RESPONSE,
            resultJSON.toString().getBytes("UTF-8"));
    Log.info(getClass(),
    "Function doperform of class GetAllBalance  finished");
}
}