让Android Volley 支持cookie session 其实很简单!

看以下几步操作即可：

实例化带cookie DefaultHttpClient 网络通信类

	/**
	 * 返回请求队列
	 * @return
	 */
	 private RequestQueue getRequestQueue() {
        if (mRequestQueue == null) {
        	 DefaultHttpClient httpclient = new DefaultHttpClient();
        	 //非持久化存储(内存存储) BasicCookieStore | 持久化存储 PreferencesCookieStore
        	 CookieStore cookieStore = new PreferencesCookieStore(this);
        	 httpclient.setCookieStore(cookieStore);
        	 HttpStack httpStack = new HttpClientStack(httpclient);
             mRequestQueue = Volley.newRequestQueue(getApplicationContext(),httpStack);
        }
        
        return mRequestQueue;
	 }
	 

在这里不就详细介绍cookie 的定义了，我想大家都很清楚明白！先说说这里的具体cookie存储实现原理，其实就是Android保存了cookie信息到存储卡上或存储到内存中一直和服务器端保持会话状态。

以下是cookie 持久化存储的具体实现代码：

package org.wavefar.lib.http;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.http.client.CookieStore;
import org.apache.http.cookie.Cookie;
import org.apache.http.impl.cookie.BasicClientCookie;

import android.content.Context;
import android.content.SharedPreferences;
import android.text.TextUtils;

/**
 * 保存到 Preferences 的cookie
 * @description
 * @author summer
 * @date 2014年5月9日 下午3:11:08
 *
 */
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, 0);
        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 prefsWriter = cookiePrefs.edit();
        prefsWriter.putString(COOKIE_NAME_STORE, TextUtils.join(",", cookies.keySet()));
        prefsWriter.putString(COOKIE_NAME_PREFIX + name, encodeCookie(new SerializableCookie(cookie)));
        prefsWriter.commit();
    }

    @Override
    public void clear() {
        // Clear cookies from local store
        cookies.clear();

        // Clear cookies from persistent store
        SharedPreferences.Editor prefsWriter = cookiePrefs.edit();
        for(String name : cookies.keySet()) {
            prefsWriter.remove(COOKIE_NAME_PREFIX + name);
        }
        prefsWriter.remove(COOKIE_NAME_STORE);
        prefsWriter.commit();
    }

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

        for(ConcurrentHashMap.Entry<String, Cookie> entry : cookies.entrySet()) {
            String name = entry.getKey();
            Cookie cookie = entry.getValue();
            if(cookie.isExpired(date)) {
                // 清除cookies
                cookies.remove(name);

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

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

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

        return clearedAny;
    }

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



    protected String encodeCookie(SerializableCookie cookie) {
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        try {
            ObjectOutputStream outputStream = new ObjectOutputStream(os);
            outputStream.writeObject(cookie);
        } catch (Exception 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 (Exception e) {
           e.printStackTrace();
        }

        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());
        }
    }
}