public class NetworkUtil {


    /*
    * 傳入一個Url地址  返回一個JSON字串    * 網路請求的情況分析:
    *   如果是404 500 ... 代表網路(Http協議)請求失敗    *   200 伺服器返回成功    *       業務成功  /業務失敗    * */
public static String doGet(String urlPath) {
        try {
            URL url = new URL(urlPath);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET"
 
);
            if (conn.getResponseCode() == 200) {
                InputStream is = conn.getInputStream();
                BufferedReader reader = new BufferedReader(new InputStreamReader(is));
                return reader.readLine();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return 
 
"{ \"success\": false,\n   \"errorMsg\": \"後臺伺服器開小差了!\",\n     \"result\":{}}";
    }

    /*
    * 傳入一個Url地址  返回一個JSON字串    * */
public static String doPost(String urlPath, HashMap<String, String> paramsMap) {
        try {
            URL url = new URL(urlPath);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("POST"
 
);
            //--------------------------------
conn.setDoOutput(true);
            conn.getOutputStream().write(getParams(paramsMap).getBytes());
            //--------------------------------
if (conn.getResponseCode() == 200) {
                InputStream is = conn.getInputStream();
                BufferedReader reader = new BufferedReader(new InputStreamReader(is));
                return reader.readLine();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "{ \"success\": false,\n   \"errorMsg\": \"後臺伺服器開小差了!\",\n     \"result\":{}}";
    }

    private static String getParams(HashMap<String, String> paramsMap) {
        String result = "";
        for (HashMap.Entry<String, String> entity : paramsMap.entrySet()) {
            result += "&" + entity.getKey() + "=" + entity.getValue();
        }
        return result.substring(1);
    }


}