Android Okhttp完美同步持久Cookie实现免登陆

经过对Retrofit2.0的<Retrofit 2.0 超能实践，完美支持Https传输>基础入门和案例实践，掌握了怎么样使用Retrofit访问网络，加入自定义header，包括加入SSL证书，基本的调试基础，可是正常的开发中会涉及cookie同步问题，能够实现一些自动或免登陆登录问题，接下来进入cookie同步姿式

Cookie

Cookies是一种可以让网站服务器把少许数据储存到客户端的硬盘或内存，或是从客户端的硬盘读取数据的一种技术。Cookies是当你浏览某网站时，由Web服务器置于你硬盘上的一个很是小的文本文件，它能够记录你的用户ID、密码、浏览过的网页、停留的时间等信息。当你再次来到该网站时，网站经过读取Cookies，得知你的相关信息，就能够作出相应的动做，如在页面显示欢迎你的标语，或者让你不用输入ID、密码就直接登陆等等。

从本质上讲，它能够看做是你的身份证。但Cookies不能做为代码执行，也不会传送病毒，且为你所专有，并只能由提供它的服务器来读取。保存的信息片段以“名/值”对(name-value pairs)的形式储存，一个“名/值”对仅仅是一条命名的数据。一个网站只能取得它放在你的电脑中的信息，它没法从其它的Cookies文件中取得信息，也没法获得你的电脑上的其它任何东西。

Cookies中的内容大多数通过了加密处理，所以通常用户看来只是一些毫无心义的字母数字组合，只有服务器的CGI处理程序才知道它们真正的含义。

Cookie也是http的会话跟踪技术，也包含web端的session。cookie的做用就是为了解决HTTP协议无状态的缺陷所做的努力.

方式一：

自定义cookie

HttpClient中你们都知道加入cookie的方式

AsyncHttpClient client = new AsyncHttpClient(); PersistentCookieStore myCookieStore = new PersistentCookieStore(MainActivity.this); client.setCookieStore(myCookieStore);

所以Retrofit中需自我实现一个PersistentCookieStore 用来储存OkHttpCookies。

-PersistentCookieStore

/** * Created by LIUYONGKUI on 2016-06-09. */ public class PersistentCookieStore { private static final String LOG_TAG = "PersistentCookieStore"; private 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 HashMap<>(); //将持久化的cookies缓存到内存中 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); //将cookies缓存到内存中 若是缓存过时 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())) { cookies.get(url.host()).remove(name); } } //讲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 OkHttpCookies(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 序列化以后的string */ protected String encodeCookie(OkHttpCookies 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()); } /** * 将字符串反序列化成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 = ((OkHttpCookies) 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; } /** * 二进制数组转十六进制字符串 * * @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); } /** * 十六进制字符串转二进制数组 * * @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; }

- OkHttpCookies

须要实现序列化的 OkHttpCookies 用来持久OkHttpCookies

/** * Created by LIUYONGKUI on 2016-05-20. */ public class OkHttpCookies implements Serializable { private transient final Cookie cookies; private transient Cookie clientCookies; public OkHttpCookies(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(); }

}

-自定义CookieManger

实现有一个自定义的CookieManger来管理cookies,实现以K-V结构获取set,getCookier

public class CookieManger implements CookieJar { public static String APP_PLATFORM = "app-platform"; private static Context mContext; private static PersistentCookieStore cookieStore; public CookieManger(Context context) { mContext = context; if (cookieStore == null ) { cookieStore = new PersistentCookieStore(mContext); } } @Override public void saveFromResponse(HttpUrl url, List<Cookie> cookies) { if (cookies != null && 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; } static class Customer { private String userID; private String token; public Customer(String userID, String token) { this.userID = userID; this.token = token; } public String getUserID() { return userID; } public void setUserID(String userID) { this.userID = userID; } public String getToken() { return token; } public void setToken(String token) { this.token = token; } }

- Retrofit加入cookie

OkHttpClient okHttpClient = new OkHttpClient.Builder() .addNetworkInterceptor( new HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.HEADERS)) .cookieJar(new CookieManger(context)) .addInterceptor(loginInterceptor) .connectTimeout(DEFAULT_TIMEOUT, TimeUnit.SECONDS) .build(); Retrofit retrofit = new Retrofit.Builder() .client(okHttpClient) .build();

总结

实现加入cookies持久，实现免登录基本步骤

1 实现可序列化的OkHttpcookies

2 实现储存OkHttpcookies的PersistentCookieStore

3 实现cookies管理工具CookieManger

4 构建OKHttpClient

5 Retrofit加入自定义的okHttpClient

6直接调用RetrofitClient

方式二：

方法一可能对某些网站不兼容，能够借助retfoit的拦截器实现

用来加入cookie

public class ReadCookiesInterceptor implements Interceptor { @Override public Response intercept(Chain chain) throws IOException { Request.Builder builder = chain.request().newBuilder(); HashSet<String> preferences = (HashSet) Preferences.getDefaultPreferences().getStringSet(Preferences.PREF_COOKIES, new HashSet<>()); for (String cookie : preferences) { builder.addHeader("Cookie", cookie); Log.v("OkHttp", "Adding Header: " + cookie); // This is done so I know which headers are being added; this interceptor is used after the normal logging of OkHttp } return chain.proceed(builder.build()); }

}

用来保存Cookies

public class SaveCookiesInterceptor implements Interceptor { @Override public Response intercept(Chain chain) throws IOException { Response originalResponse = chain.proceed(chain.request()); if (!originalResponse.headers("Set-Cookie").isEmpty()) { HashSet<String> cookies = new HashSet<>(); for (String header : originalResponse.headers("Set-Cookie")) { cookies.add(header); } Preferences.getDefaultPreferences().edit() .putStringSet(Preferences.PREF_COOKIES, cookies) .apply(); } return originalResponse; }

}

okhttp

OkHttpClient okHttpClient = new OkHttpClient(); okHttpClient.interceptors().add(new ReadCookiesInterceptor()); okHttpClient.interceptors().add(new SaveCookiesInterceptor());

Retrofit

Retrofit retrofit = new Retrofit.Builder() .client(okHttpClient) .build();