主要功能：
1.可以将JSON字符串转换为java对象
2.对post缓存支持，可以很随意设置接口缓存

public class MyApplication extends Application {

    @Override
    public void onCreate() {
        super.onCreate();
        // 缓存目录
        HttpClient.cachePath = getAppCacheDir() + File.separator + "httpCache";
    }

    /**
     * 获取缓存目录
     */
    public String getAppCacheDir(){
        String cachePath;
        if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())
                || !Environment.isExternalStorageRemovable()) {
            cachePath = getExternalCacheDir().getPath();
        } else {
            cachePath = getCacheDir().getPath();
        }
        return cachePath;
    }
}

public class UserService extends BaseHttpService {

    private static UserService instance;

    private UserService() {
    }

    public static UserService getInstance() {
        if (instance == null) {
            instance = new UserService();
        }
        return instance;
    }

    private static final String getUserById = "http://192.168.1.165:8080/test/user";

    /**
     * 获取用户信息
     */
    public void getUserById(int userId, OnResponseListener listener) {
        Map<String, Object> map = getMap();
        map.put("uid", userId);
        RequestParam param = getRequestParam(getUserById, map);
        ResultType resultType = getResultType(ResultType.Type.OBJECT, UserBean.class);
        CacheTime cacheTime = getCacheTime(TimeUnit.SECONDS, 10);
        executeRequest(param, resultType, cacheTime, listener);
    }
}

private void testHttp() {
        UserService.getInstance().getUserById(13, new OnUIResponseListener(this, this) {
            @Override
            public void callUISuccess(ResultObject resultObject) {
                UserBean user = (UserBean) resultObject.getData();
                tv_json.setText(user.getId() + " , " + user.getName());
            }

            @Override
            public void callUIFail() {
                Toast.makeText(getApplicationContext(), "失败", Toast.LENGTH_SHORT).show();
            }
        });
    }