Android之CookieStore的持久化【原创】

CookieStore是一个对象，有的服务端 ，比如.net，保持登录状态不是用httpclient.addHeader(“cookie”,SessionId),而是用

httppost.setCookieStore(cokkieStore).SessionId存储很方便，就一串字符串，可直接储存唉SharedPreference里即可，那么对于CookieStore对象的存储无疑成了难题

存储方法：自定义一个类，继承CookieStore

public class PreferencesCookieStore implements CookieStore {

private static final String COOKIE_PREFS = "CookiePrefsFile";
private static final String COOKIE_NAME_STORE = "names";
private static final String COOKIE_NAME_PREFIX = "cookie_";

private final ConcurrentHashMap<String, Cookie> cookies;
private final SharedPreferences cookiePrefs;

/**
* Construct a persistent cookie store.
*/
public PreferencesCookieStore(Context context) {
cookiePrefs = context.getSharedPreferences(COOKIE_PREFS, Context.MODE_PRIVATE);
cookies = new ConcurrentHashMap<String, Cookie>();

// Load any previously stored cookies into the store
String storedCookieNames = cookiePrefs.getString(COOKIE_NAME_STORE, null);
if (storedCookieNames != null) {
String[] cookieNames = TextUtils.split(storedCookieNames, ",");
for (String name : cookieNames) {
String encodedCookie = cookiePrefs.getString(COOKIE_NAME_PREFIX + name, null);
if (encodedCookie != null) {
Cookie decodedCookie = decodeCookie(encodedCookie);
if (decodedCookie != null) {
cookies.put(name, decodedCookie);
}
}
}

// Clear out expired cookies
clearExpired(new Date());
}
}

@Override
public void addCookie(Cookie cookie) {
String name = cookie.getName();

// Save cookie into local store, or remove if expired
if (!cookie.isExpired(new Date())) {
cookies.put(name, cookie);
} else {
cookies.remove(name);
}

// Save cookie into persistent store
SharedPreferences.Editor editor = cookiePrefs.edit();
editor.putString(COOKIE_NAME_STORE, TextUtils.join(",", cookies.keySet()));
editor.putString(COOKIE_NAME_PREFIX + name, encodeCookie(new SerializableCookie(cookie)));
editor.commit();
}

@Override
public void clear() {
// Clear cookies from persistent store
SharedPreferences.Editor editor = cookiePrefs.edit();
for (String name : cookies.keySet()) {
editor.remove(COOKIE_NAME_PREFIX + name);
}
editor.remove(COOKIE_NAME_STORE);
editor.commit();

// Clear cookies from local store
cookies.clear();
}

@Override
public boolean clearExpired(Date date) {
boolean clearedAny = false;
SharedPreferences.Editor editor = cookiePrefs.edit();

for (ConcurrentHashMap.Entry<String, Cookie> entry : cookies.entrySet()) {
String name = entry.getKey();
Cookie cookie = entry.getValue();
if (cookie.getExpiryDate() == null || cookie.isExpired(date)) {
// Remove the cookie by name
cookies.remove(name);

// Clear cookies from persistent store
editor.remove(COOKIE_NAME_PREFIX + name);

// We've cleared at least one
clearedAny = true;
}
}

// Update names in persistent store
if (clearedAny) {
editor.putString(COOKIE_NAME_STORE, TextUtils.join(",", cookies.keySet()));
}
editor.commit();

return clearedAny;
}

@Override
public List<Cookie> getCookies() {
return new ArrayList<Cookie>(cookies.values());
}

public Cookie getCookie(String name) {
return cookies.get(name);
}
protected String encodeCookie(SerializableCookie cookie) {
ByteArrayOutputStream os = new ByteArrayOutputStream();
try {
ObjectOutputStream outputStream = new ObjectOutputStream(os);
outputStream.writeObject(cookie);
} catch (Throwable e) {
return null;
}

return byteArrayToHexString(os.toByteArray());
}

protected Cookie decodeCookie(String cookieStr) {
byte[] bytes = hexStringToByteArray(cookieStr);
ByteArrayInputStream is = new ByteArrayInputStream(bytes);
Cookie cookie = null;
try {
ObjectInputStream ois = new ObjectInputStream(is);
cookie = ((SerializableCookie) ois.readObject()).getCookie();
} catch (Throwable e) {
LogUtils.e(e.getMessage(), e);
}

return cookie;
}

// Using some super basic byte array <-> hex conversions so we don't have
// to rely on any large Base64 libraries. Can be overridden if you like!
protected String byteArrayToHexString(byte[] b) {
StringBuffer sb = new StringBuffer(b.length * 2);
for (byte element : b) {
int v = element & 0xff;
if (v < 16) {
sb.append('0');
}
sb.append(Integer.toHexString(v));
}
return sb.toString().toUpperCase();
}

protected byte[] hexStringToByteArray(String s) {
int len = s.length();
byte[] data = new byte[len / 2];
for (int i = 0; i < len; i += 2) {
data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4) + Character.digit(s.charAt(i + 1), 16));
}
return data;
}
public class SerializableCookie implements Serializable {
private static final long serialVersionUID = 6374381828722046732L;

private transient final Cookie cookie;
private transient BasicClientCookie clientCookie;

public SerializableCookie(Cookie cookie) {
this.cookie = cookie;
}

public Cookie getCookie() {
Cookie bestCookie = cookie;
if (clientCookie != null) {
bestCookie = clientCookie;
}
return bestCookie;
}

private void writeObject(ObjectOutputStream out) throws IOException {
out.writeObject(cookie.getName());
out.writeObject(cookie.getValue());
out.writeObject(cookie.getComment());
out.writeObject(cookie.getDomain());
out.writeObject(cookie.getExpiryDate());
out.writeObject(cookie.getPath());
out.writeInt(cookie.getVersion());
out.writeBoolean(cookie.isSecure());
}

private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
String name = (String) in.readObject();
String value = (String) in.readObject();
clientCookie = new BasicClientCookie(name, value);
clientCookie.setComment((String) in.readObject());
clientCookie.setDomain((String) in.readObject());
clientCookie.setExpiryDate((Date) in.readObject());
clientCookie.setPath((String) in.readObject());
clientCookie.setVersion(in.readInt());
clientCookie.setSecure(in.readBoolean());
}
}
}

存储方法如下：

/* 获取并保存Cookie值 */
cookieStore = httpClient.getCookieStore();
List<Cookie> cookies = httpClient.getCookieStore().getCookies(); // 持久化CookieStore
PreferencesCookieStore preferencesCookieStore = new PreferencesCookieStore(
context);
for (Cookie cookie : cookies) {
preferencesCookieStore.addCookie(cookie);
}

这样就实现了持久化存储

使用方如下：

PreferencesCookieStore cookieStore = new PreferencesCookieStore(App.getInstance().getApplicationContext());

httpClient.setCookieStore(cookieStore);