Java tutorial
/* * Copyright (c) 2013. wyouflf (wyouflf@gmail.com) * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.kerkr.edu.cache; import android.content.Context; import android.content.SharedPreferences; import android.text.TextUtils; import org.apache.http.client.CookieStore; import org.apache.http.cookie.Cookie; import org.apache.http.impl.cookie.BasicClientCookie; import com.kerkr.edu.log.VALog; import java.io.*; import java.util.ArrayList; import java.util.Date; import java.util.List; import java.util.concurrent.ConcurrentHashMap; /** * A CookieStore impl, it's save cookie to SharedPreferences. * * @author michael yang */ public class CookieUtils 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 CookieUtils(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) { VALog.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()); } } }