public static String sendGet(String url, String param) {
    String result = "";
    BufferedReader in = null;
    try {
      String urlNameString = url + "?" + param;
      URL realUrl = new URL(urlNameString);
      // 打開和URL之間的連接
      URLConnection connection = realUrl.openConnection();
      // 設(shè)置通用的請求屬性
      connection.setRequestProperty("accept", "*/*");
      connection.setRequestProperty("connection", "Keep-Alive");
      connection.setRequestProperty("user-agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
      // 建立實際的連接
      connection.connect();
      // 獲取所有響應(yīng)頭字段
      Map<String, List<String>> map = connection.getHeaderFields();
      // 遍歷所有的響應(yīng)頭字段
      for (String key : map.keySet()) {
        System.out.println(key + "--->" + map.get(key));
      }
      // 定義 BufferedReader輸入流來讀取URL的響應(yīng)
      in = new BufferedReader(new InputStreamReader(
          connection.getInputStream()));
      String line;
      while ((line = in.readLine()) != null) {
        result += line;
      }
    } catch (Exception e) {
      System.out.println("發(fā)送GET請求出現(xiàn)異常！" + e);
      e.printStackTrace();
    }
    // 使用finally塊來關(guān)閉輸入流
    finally {
      try {
        if (in != null) {
          in.close();
        }
      } catch (Exception e2) {
        e2.printStackTrace();
      }
    }
    return result;
  }

 @Override
  public String WeChatAuthorization(String jsCode) {
   try {
     String url = "https://api.weixin.qq.com/sns/oauth2/access_token";
     String appid = WxConstant.appId; //appid
     String secret = WxConstant.secret; //secret
     String grant_type = "authorization_code";
     String param = "appid="+appid+"&secret="+secret+"&code="+jsCode+"&grant_type="+grant_type;
     String sr = WxUtil.sendGet(url,param);
     JSONObject json = new JSONObject(sr);
     String openid = (String) json.get("openid");
     String accessToken = (String) json.get("access_token");
     return openid;
  }catch(Exception e){
  	e.printStackTrace();
  }
  return null;
 }

@Override
  public Map WeChatUserInfo(String accessToken, String openid) {
    try {
      String url = "https://api.weixin.qq.com/sns/userinfo";
      String param = "access_token="+accessToken+"&openid="+openid+"&lang=zh_CN";
      String sr = WxUtil.sendGet(url,param);
      JSONObject json = new JSONObject(sr);
      Map<String,String> map = new HashedMap();
      String headimgurl = (String)json.get("headimgurl");
      String nickName = (String)json.get("nickname");
      map.put("headimgurl",headimgurl);
      map.put("nickName",nickName);
      return map;
    } catch (JSONException e) {
      e.printStackTrace();
    }
    return null;
  }