retrofit2.0 接口该怎么写

研究了一段retrofit，但是还是有一点不清楚，就是接口不确定怎么写，
假如有个接口请求连接如下 ：
http://test.com/indiana-front/user/login10?data={"phone":"16111110000","smsType":"USERLOGIN","validCode":"1"}&token=9FF93C4DE6B54A8F9CCE750E324FBF1C&mac=868227023024375&cfcnl=Official&version=1.1.0&requestType=1

其中：token，mac，cfcnl，version，requestType都是放在头的

请问该怎么写接口

http://blog.csdn.net/zuck_t/article/details/50718774

我直接把我的拷贝给你吧 代码 处理头部在最下面处理的
public class RetrofitManager {
//时间超时
public static final int TIMEOUT = 30;
private APIService mApiService;
private static volatile OkHttpClient mOkHttpClient;
//保证多个地址的
public static Map managers = new HashMap<>();

public static RetrofitManager getInstance(String url) {
    RetrofitManager instance = managers.get(url);
    if (instance == null) {
        instance = new RetrofitManager(url);
        managers.put(url, instance);
    }
    return instance;
}

public static RetrofitManager getInstance() {
    return getInstance(UstarURL.SERVICE_URL);
}

private RetrofitManager(String url) {
    initOkHttpClient();
    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl(url)
            .addConverterFactory(GsonConverterFactory.create())
            .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
            .client(mOkHttpClient)
            .build();
    mApiService = retrofit.create(APIService.class);
}

public static APIService getAPIService() {
    return getInstance().mApiService;
}

public static APIService getAPIService(String url) {
    return getInstance(url).mApiService;
}

private void initOkHttpClient() {
    HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
    interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
    if (mOkHttpClient == null) {
        synchronized (RetrofitManager.class) {
            if (mOkHttpClient == null) {
                // 指定缓存路径,缓存大小100Mb
                Cache cache = new Cache(new File(UStarApplication.getInstance().getApplicationContext().getCacheDir(), "HttpCache"),  1024 * 1024 * 100);
                mOkHttpClient = new OkHttpClient.Builder()
                        .cache(cache)
                        //统一处理请求头
                        .addInterceptor(netInterceptor)
                        .retryOnConnectionFailure(true)
                        .connectTimeout(TIMEOUT, TimeUnit.SECONDS)
                        .build();

            }
        }
    }
}


//头部统一处理
Interceptor netInterceptor = new Interceptor() {
    @Override
    public Response intercept(Chain chain) throws IOException {
        Request request = chain.request();
        //网络不可用
        if (!UStarUtils.isNetworkAvailable(UStarApplication.getInstance().getApplicationContext())) {
            request=request.newBuilder().cacheControl(CacheControl.FORCE_CACHE).build();
        }
        if(SPUtils.isLogin(UStarApplication.getInstance().getApplicationContext())) {
            request=  request.newBuilder().addHeader("rsa","").build();
        }else {
            request=request.newBuilder().addHeader("rsa",SPUtils.getUser(UStarApplication.getInstance().getApplicationContext()).token+"").build();
        }
        return chain.proceed(request);
    }
};

}