封装OKHttp的get和post请求模版

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public class HttpUtils {        private static final String TAG = "HttpUtils";        private static volatile HttpUtils instance;        public static Handler handler = new Handler();        private HttpUtils() {        }        public static HttpUtils getInstance() {            if (null == instance) {                synchronized (HttpUtils.class) {                    if (instance == null) {                        instance = new HttpUtils();                    }                }            }            return instance;        }        /**         * 对外提供的get请求         *         * @param url         * @param map         * @param callback         * @param cls         */        public void get(String url, Map<String, String> map, final Callback callback, final Class cls) {            // 对url和参数做一下拼接处理//        http://www.baidu.com/login?name=zs            StringBuffer sb = new StringBuffer();            sb.append(url);            // 如果存在？            if (sb.indexOf("?") != -1) {                // 如果？不在最后一位                if (sb.indexOf("?") != sb.length() - 1) {                    sb.append("&");                }            } else {                sb.append("?");            }            for (Map.Entry<String, String> entry : map.entrySet()) {                sb.append(entry.getKey())                        .append("=")                        .append(entry.getValue())                        .append("&");            }            if (sb.indexOf("&") != -1) {                sb.deleteCharAt(sb.lastIndexOf("&"));            }            Log.i(TAG, "get url: " + sb);            OkHttpClient client = new OkHttpClient();            final Request request = new Request.Builder()                    .get()                    .url(sb.toString())                    .build();            Call call = client.newCall(request);            call.enqueue(new okhttp3.Callback() {                @Override                public void onFailure(Call call, final IOException e) {                    Log.e(TAG, "onFailure: " + e.getCause().getStackTrace() + e.getMessage());                    handler.post(new Runnable() {                        @Override                        public void run() {                            callback.onFailed(e);                        }                    });                }                @Override                public void onResponse(Call call, Response response) throws IOException {                    String result = response.body().string();                    Log.i(TAG, "onResponse: " + result);                    final Object o = GsonUtils.getInstance().fromJson(result, cls);                    handler.post(new Runnable() {                        @Override                        public void run() {                            callback.onSuccess(o);                        }                    });                }            });        }        /**         * 封装的post请求         *         * @param url         * @param map         * @param callback         * @param cls         */        public void post(String url, Map<String, String> map, final Callback callback, final Class cls) {            OkHttpClient client = new OkHttpClient();            FormBody.Builder builder = new FormBody.Builder();            for (Map.Entry<String, String> entry : map.entrySet()) {                builder.add(entry.getKey(), entry.getValue());            }            FormBody body = builder.build();            final Request request = new Request.Builder()                    .url(url)                    .post(body)                    .build();            Call call = client.newCall(request);            call.enqueue(new okhttp3.Callback() {                @Override                public void onFailure(Call call, final IOException e) {                    Log.e(TAG, "onFailure: " + e.getCause().getStackTrace() + e.getMessage());                    handler.post(new Runnable() {                        @Override                        public void run() {                            callback.onFailed(e);                        }                    });                }                @Override                public void onResponse(Call call, Response response) throws IOException {                    String result = response.body().string();                    Log.i(TAG, "onResponse: " + result);                    final Object o = GsonUtils.getInstance().fromJson(result, cls);                    handler.post(new Runnable() {                        @Override                        public void run() {                            callback.onSuccess(o);                        }                    });                }            });        }    }
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