Android 原生HttpURLConnection网络请求工具类（get post)

public class NetworkUtil {


    /*
    * 传入一个Url地址  返回一个JSON字符串
    * 网络请求的情况分析:
    *   如果是404 500 ... 代表网络(Http协议)请求失败
    *   200 服务器返回成功
    *       业务成功  /业务失败
    * */
    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\": \"后台服务器开小差了!\",\n     \"result\":{}}";
    }

    /*
    * 传入一个Url地址  返回一个JSON字符串
    * */
    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\": \"后台服务器开小差了!\",\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);
    }


}