【Android架構】基於MVP模式的Retrofit2+RXjava封裝之常見問題（四）

時間  2019-11-08
標籤 Android架構 基於 mvp 模式 retrofit2+rxjava retrofit rxjava 封裝 常見問題 欄目 Java 简体版
原文   原文鏈接

前言

在前幾篇中，咱們實現了基於MVP模式的Retrofit2+RXjava封裝，今天要說的是使用Retrofit2和Okhttp 過程當中遇到的一些問題java

問題

1.上傳數組

相信不少人都遇到到這個問題，這裏說下筆者的2種方案：android

方案一 把整個請求體轉換爲JSON提交git

首先是ApiServerjson

@POST("api/goods/send")
    Observable<BaseModel> sendGoods(@Body RequestBody requestBody);
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Presenterapi

String[] str = new String["123","234"];
   HashMap<String, Object> map = new HashMap<>();
        map.put("province", addressModel.getProvince());
        map.put("city", addressModel.getCity());
        map.put("area", addressModel.getArea());
        map.put("zipcode", addressModel.getZipcode());
        map.put("user_goods_ids", str);
        RequestBody requestBody = RequestBody.create(MediaType.parse("application/json; charset=utf-8"),
                new Gson().toJson(map));

        mPresenter.sendGoods(requestBody);
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方案二 模擬數組數組

首先是ApiServer瀏覽器

//商品評論(私有接口)
    @POST("PrivateApi/goods/goodsComment")
    @FormUrlEncoded
    Observable<BaseModel> goodsComment(@FieldMap ArrayMap<String, Object> map);
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Presenter緩存

ArrayMap<String, Object> map = new ArrayMap<>();
            map.put("goods_id", goods_id);
            map.put("content", etElaluate.getText().toString().trim());
            map.put("address", address);
            for (int i = 0; i < data.size(); i++) {
                map.put("img[" + i + "]", data.get(i));
            }
           presenter.goodsComment(map);
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2.Cookie 持續化存儲

說道這裏，不得不說，Okhttp仍是強大cookie

client = new OkHttpClient.Builder()
                .cookieJar(new CookiesManager(MyApplication.getContext()))
                .connectTimeout(10, TimeUnit.SECONDS)
                .readTimeout(10, TimeUnit.SECONDS)
// .sslSocketFactory()
                .build();
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建立OkHttpClient時，能夠傳遞一個實現了CookieJar 的自定義管理cookie類，只須要重寫其saveFromResponse(HttpUrl url, List cookies)和loadForRequest(HttpUrl url)方法。 這2個方法的做用也很明顯，一個是保存cookie，一個是獲取cookie架構

public class CookiesManager implements CookieJar {

    private final PersistentCookieStore cookieStore;

    public CookiesManager(Context context) {
        cookieStore = new PersistentCookieStore(context);
    }



    @Override
    public void saveFromResponse(HttpUrl url, List<Cookie> cookies) {
        if (cookies.size() > 0) {
            for (Cookie item : cookies) {
                cookieStore.add(url, item);
            }
        }
    }

    @Override
    public List<Cookie> loadForRequest(HttpUrl url) {
        List<Cookie> cookies = cookieStore.get(url);
        return cookies;
    }
}
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PersistentCookieStore

public class PersistentCookieStore {

    private static final String LOG_TAG = "PersistentCookieStore";
    public static final String COOKIE_PREFS = "Cookies_Prefs";
    private final Map<String, ConcurrentHashMap<String, Cookie>> cookies;
    private final SharedPreferences cookiePrefs;

    public PersistentCookieStore(Context context) {
        cookiePrefs = context.getSharedPreferences(COOKIE_PREFS, 0);
        cookies = new ArrayMap<>();

        //將持久化的cookies緩存到內存中 即map cookies
        Map<String, ?> prefsMap = cookiePrefs.getAll();
        for (Map.Entry<String, ?> entry : prefsMap.entrySet()) {
            String[] cookieNames = TextUtils.split((String) entry.getValue(), ",");
            for (String name : cookieNames) {
                String encodedCookie = cookiePrefs.getString(name, null);
                if (encodedCookie != null) {
                    Cookie decodedCookie = decodeCookie(encodedCookie);
                    if (decodedCookie != null) {
                        if (!cookies.containsKey(entry.getKey())) {
                            cookies.put(entry.getKey(), new ConcurrentHashMap<String, Cookie>());
                        }
                        cookies.get(entry.getKey()).put(name, decodedCookie);
                    }
                }
            }
        }
    }

    protected String getCookieToken(Cookie cookie) {
        return cookie.name() + "@" + cookie.domain();
    }

  public void add(HttpUrl url, Cookie cookie) {
        String name = getCookieToken(cookie);

        //將cookies緩存到內存中 若是緩存過時 就重置此cookie
        if (!cookie.persistent()) {
            if (!cookies.containsKey(url.host())) {
                cookies.put(url.host(), new ConcurrentHashMap<String, Cookie>());
            }
            cookies.get(url.host()).put(name, cookie);
        } else {
            if (cookies.containsKey(url.host())) {
                if (cookies.get(url.host()) != null) {
                    cookies.get(url.host()).remove(name);
                }
            }
        }

        if (cookies.get(url.host()) != null) {

            //講cookies持久化到本地
            SharedPreferences.Editor prefsWriter = cookiePrefs.edit();
            prefsWriter.putString(url.host(), TextUtils.join(",", cookies.get(url.host()).keySet()));
            prefsWriter.putString(name, encodeCookie(new SerializableOkHttpCookies(cookie)));
            prefsWriter.apply();
        }
    }
    public List<Cookie> get(HttpUrl url) {
        ArrayList<Cookie> ret = new ArrayList<>();
        if (cookies.containsKey(url.host()))
            ret.addAll(cookies.get(url.host()).values());
        return ret;
    }

    public boolean removeAll() {
        SharedPreferences.Editor prefsWriter = cookiePrefs.edit();
        prefsWriter.clear();
        prefsWriter.apply();
        cookies.clear();
        return true;
    }

    public boolean remove(HttpUrl url, Cookie cookie) {
        String name = getCookieToken(cookie);

        if (cookies.containsKey(url.host()) && cookies.get(url.host()).containsKey(name)) {
            cookies.get(url.host()).remove(name);

            SharedPreferences.Editor prefsWriter = cookiePrefs.edit();
            if (cookiePrefs.contains(name)) {
                prefsWriter.remove(name);
            }
            prefsWriter.putString(url.host(), TextUtils.join(",", cookies.get(url.host()).keySet()));
            prefsWriter.apply();

            return true;
        } else {
            return false;
        }
    }

    public List<Cookie> getCookies() {
        ArrayList<Cookie> ret = new ArrayList<>();
        for (String key : cookies.keySet())
            ret.addAll(cookies.get(key).values());

        return ret;
    }

    /** * cookies 序列化成 string * * @param cookie 要序列化的cookie * @return 序列化以後的string */
    protected String encodeCookie(SerializableOkHttpCookies cookie) {
        if (cookie == null)
            return null;
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        try {
            ObjectOutputStream outputStream = new ObjectOutputStream(os);
            outputStream.writeObject(cookie);
        } catch (IOException e) {
            Log.d(LOG_TAG, "IOException in encodeCookie", e);
            return null;
        }

        return byteArrayToHexString(os.toByteArray());
    }

    /** * 將字符串反序列化成cookies * * @param cookieString cookies string * @return cookie object */
    protected Cookie decodeCookie(String cookieString) {
        byte[] bytes = hexStringToByteArray(cookieString);
        ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(bytes);
        Cookie cookie = null;
        try {
            ObjectInputStream objectInputStream = new ObjectInputStream(byteArrayInputStream);
            cookie = ((SerializableOkHttpCookies) objectInputStream.readObject()).getCookies();
        } catch (IOException e) {
            Log.d(LOG_TAG, "IOException in decodeCookie", e);
        } catch (ClassNotFoundException e) {
            Log.d(LOG_TAG, "ClassNotFoundException in decodeCookie", e);
        }

        return cookie;
    }

    /** * 二進制數組轉十六進制字符串 * * @param bytes byte array to be converted * @return string containing hex values */
    protected String byteArrayToHexString(byte[] bytes) {
        StringBuilder sb = new StringBuilder(bytes.length * 2);
        for (byte element : bytes) {
            int v = element & 0xff;
            if (v < 16) {
                sb.append('0');
            }
            sb.append(Integer.toHexString(v));
        }
        return sb.toString().toUpperCase(Locale.US);
    }

    /** * 十六進制字符串轉二進制數組 * * @param hexString string of hex-encoded values * @return decoded byte array */
    protected byte[] hexStringToByteArray(String hexString) {
        int len = hexString.length();
        byte[] data = new byte[len / 2];
        for (int i = 0; i < len; i += 2) {
            data[i / 2] = (byte) ((Character.digit(hexString.charAt(i), 16) << 4) + Character.digit(hexString.charAt(i + 1), 16));
        }
        return data;
    }
}
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SerializableOkHttpCookies

public class SerializableOkHttpCookies implements Serializable {

    private transient final Cookie cookies;
    private transient Cookie clientCookies;

    public SerializableOkHttpCookies(Cookie cookies) {
        this.cookies = cookies;
    }

    public Cookie getCookies() {
        Cookie bestCookies = cookies;
        if (clientCookies != null) {
            bestCookies = clientCookies;
        }
        return bestCookies;
    }

    private void writeObject(ObjectOutputStream out) throws IOException {
        out.writeObject(cookies.name());
        out.writeObject(cookies.value());
        out.writeLong(cookies.expiresAt());
        out.writeObject(cookies.domain());
        out.writeObject(cookies.path());
        out.writeBoolean(cookies.secure());
        out.writeBoolean(cookies.httpOnly());
        out.writeBoolean(cookies.hostOnly());
        out.writeBoolean(cookies.persistent());
    }

    private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
        String name = (String) in.readObject();
        String value = (String) in.readObject();
        long expiresAt = in.readLong();
        String domain = (String) in.readObject();
        String path = (String) in.readObject();
        boolean secure = in.readBoolean();
        boolean httpOnly = in.readBoolean();
        boolean hostOnly = in.readBoolean();
        boolean persistent = in.readBoolean();
        Cookie.Builder builder = new Cookie.Builder();
        builder = builder.name(name);
        builder = builder.value(value);
        builder = builder.expiresAt(expiresAt);
        builder = hostOnly ? builder.hostOnlyDomain(domain) : builder.domain(domain);
        builder = builder.path(path);
        builder = secure ? builder.secure() : builder;
        builder = httpOnly ? builder.httpOnly() : builder;
        clientCookies =builder.build();
    }
}
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此方法可供參考，也能夠用其餘方式實現，好比說ACache。

這裏會引伸出一個問題，原生與h5混合開發時，h5也須要cookie的處理，具體請點擊【Android Web】騰訊X5瀏覽器的集成與常見問題。

3.添加統一請求頭

跟cookie同樣，okhttp中已經實現 在建立OkHttpClient時，能夠添加自定義的攔截器

client = new OkHttpClient.Builder()
                //添加log攔截器
                .addInterceptor(headInterceptor)
                .addInterceptor(interceptor)
                .connectTimeout(10, TimeUnit.SECONDS)
                .readTimeout(10, TimeUnit.SECONDS)
// .sslSocketFactory()
                .build();
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private Interceptor headInterceptor = new Interceptor() {
        @Override
        public Response intercept(Chain chain) throws IOException {

            Request request = chain.request();
             Request.Builder builder = request.newBuilder().addHeader("LEDAYOUXUAN", "159357456")
                    .addHeader("APP_TOKEN", UserImpl.getAppToken());

            return chain.proceed(builder.build());
        }
    };
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統一添加請求參數

處理方式仍是在攔截器中

HttpUrl httpUrl = request.url()
                    .newBuilder()
                    .addQueryParameter("login_token", token)
                    .build();
            Request build = request.newBuilder()
                    .addHeader("clienttype", "1")
                    .addHeader("sdk_type", "android")
                    .addHeader("sdk_version_name", AppUtils.getVersionName(App.getContext()))
                    .addHeader("sdk_version", AppUtils.getVersionCode(App.getContext()) + "")
                    .addHeader("Cookie", UserImpl.getCookie())
                    .url(httpUrl)
                    .build();
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POST無參數

正常post 須要添加@FormUrlEncoded 註解，當post 無參時，只須要去掉該註解便可。

@POST("PrivateApi/Users/verifySecond")
Observable<BaseModel> verifySecond();
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你的承認，是我堅持更新博客的動力，若是以爲有用，就請點個贊，謝謝

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