前几天，项目组有个技术问题，想用本地加载html， js写cookie的方法，绕过去。

想法是没有问题的， 但是测试的时候发现， 每次重新打开App， 都取不到以前Cookie里面设的值。

后来去App/data下面找WebView.db，打开来一看，cookie情报根本没有存。

原因是js写cookie的时候，没有指明expire, WebKit默认把它当成临时cookie， webview终了之后就丢失了。

这个问题本身不复杂，不过趁机我看了一把Andorid底层读取Cookie的source root:

以下source root

1. 取Cookie的API

[java] view plain copy print ?

1. CookieManager.getInstance().getCookie(url);

CookieManager.getInstance().getCookie(url);

2.CookieManager的getInstance()

[java] view plain copy print ?

1. /**
2. * Gets the singleton CookieManager instance. If this method is used
3. * before the application instantiates a {@link WebView} instance,
4. * {@link CookieSyncManager#createInstance(Context)} must be called
5. * first.
6. *
7. * @return the singleton CookieManager instance
8. */
9. publicstaticsynchronized CookieManager getInstance() {
10. return WebViewFactory.getProvider().getCookieManager();
11. }

 /**     * Gets the singleton CookieManager instance. If this method is used     * before the application instantiates a {@link WebView} instance,     * {@link CookieSyncManager#createInstance(Context)} must be called     * first.     *     * @return the singleton CookieManager instance     */    public static synchronized CookieManager getInstance() {        return WebViewFactory.getProvider().getCookieManager();    }

3.WebViewFactory是个工厂模式，额

[java] view plain copy print ?

1. staticsynchronized WebViewFactoryProvider getProvider() {
2. // For now the main purpose of this function (and the factory abstraction) is to keep
3. // us honest and minimize usage of WebViewClassic internals when binding the proxy.
4. if (sProviderInstance != null) return sProviderInstance;
6. sProviderInstance = getFactoryByName(DEFAULT_WEB_VIEW_FACTORY);
7. if (sProviderInstance == null) {
8. if (DEBUG) Log.v(LOGTAG, "Falling back to explicit linkage");
9. sProviderInstance = new WebViewClassic.Factory();
10. }
11. return sProviderInstance;
12. }

    static synchronized WebViewFactoryProvider getProvider() {        // For now the main purpose of this function (and the factory abstraction) is to keep        // us honest and minimize usage of WebViewClassic internals when binding the proxy.        if (sProviderInstance != null) return sProviderInstance;        sProviderInstance = getFactoryByName(DEFAULT_WEB_VIEW_FACTORY);        if (sProviderInstance == null) {            if (DEBUG) Log.v(LOGTAG, "Falling back to explicit linkage");            sProviderInstance = new WebViewClassic.Factory();        }        return sProviderInstance;    }

4.层层嵌套，最后生成的instance是CookieManagerClassic

[java] view plain copy print ?

1. @Override
2. public CookieManager getCookieManager() {
3. return CookieManagerClassic.getInstance();
4. }

 @Override        public CookieManager getCookieManager() {            return CookieManagerClassic.getInstance();        }

5. getCookie方法 实现在CookieManagerClassic上

[java] view plain copy print ?

1. @Override
2. public String getCookie(String url) {
3. return getCookie(url, false);
4. }
6. @Override
7. public String getCookie(String url, boolean privateBrowsing) {
8. WebAddress uri;
9. try {
10. uri = new WebAddress(url);
11. } catch (ParseException ex) {
12. Log.e(LOGTAG, "Bad address: " + url);
13. returnnull;
14. }
16. return nativeGetCookie(uri.toString(), privateBrowsing);
17. }

  @Override    public String getCookie(String url) {        return getCookie(url, false);    }    @Override    public String getCookie(String url, boolean privateBrowsing) {        WebAddress uri;        try {            uri = new WebAddress(url);        } catch (ParseException ex) {            Log.e(LOGTAG, "Bad address: " + url);            return null;        }        return nativeGetCookie(uri.toString(), privateBrowsing);    }

6. nativeGetCookie定义在CookieManager.cpp里， 恩。。。。JNI。。。

[java] view plain copy print ?

1. static jstring getCookie(JNIEnv* env, jobject, jstring url, jboolean privateBrowsing)
2. {
3. GURL gurl(jstringToStdString(env, url));
4. CookieOptions options;
5. options.set_include_httponly();
6. std::string cookies = WebCookieJar::get(privateBrowsing)->cookieStore()->GetCookieMonster()->GetCookiesWithOptions(gurl, options);
7. return stdStringToJstring(env, cookies);
8. }

static jstring getCookie(JNIEnv* env, jobject, jstring url, jboolean privateBrowsing){    GURL gurl(jstringToStdString(env, url));    CookieOptions options;    options.set_include_httponly();    std::string cookies = WebCookieJar::get(privateBrowsing)->cookieStore()->GetCookieMonster()->GetCookiesWithOptions(gurl, options);    return stdStringToJstring(env, cookies);}

7. WebCookieJar.cpp中，定义了从哪里去取得Cookie情报

[java] view plain copy print ?

1. WebCookieJar* WebCookieJar::get(bool isPrivateBrowsing)
2. {
3. MutexLocker lock(instanceMutex);
4. if (!isFirstInstanceCreated && fileSchemeCookiesEnabled)
5. net::CookieMonster::EnableFileScheme();
6. isFirstInstanceCreated = true;
7. scoped_refptr<WebCookieJar>* instancePtr = instance(isPrivateBrowsing);
8. if (!instancePtr->get())
9. *instancePtr = new WebCookieJar(databaseDirectory(isPrivateBrowsing));
10. return instancePtr->get();
11. }

WebCookieJar* WebCookieJar::get(bool isPrivateBrowsing){    MutexLocker lock(instanceMutex);    if (!isFirstInstanceCreated && fileSchemeCookiesEnabled)        net::CookieMonster::EnableFileScheme();    isFirstInstanceCreated = true;    scoped_refptr<WebCookieJar>* instancePtr = instance(isPrivateBrowsing);    if (!instancePtr->get())        *instancePtr = new WebCookieJar(databaseDirectory(isPrivateBrowsing));    return instancePtr->get();}

[java] view plain copy print ?

1. static std::string databaseDirectory(bool isPrivateBrowsing)
2. {
3. staticconstchar* const kDatabaseFilename = "/webviewCookiesChromium.db";
4. staticconstchar* const kDatabaseFilenamePrivateBrowsing = "/webviewCookiesChromiumPrivate.db";
6. std::string databaseFilePath = databaseDirectory();
7. databaseFilePath.append(isPrivateBrowsing ? kDatabaseFilenamePrivateBrowsing : kDatabaseFilename);
8. return databaseFilePath;
9. }

static std::string databaseDirectory(bool isPrivateBrowsing){    static const char* const kDatabaseFilename = "/webviewCookiesChromium.db";    static const char* const kDatabaseFilenamePrivateBrowsing = "/webviewCookiesChromiumPrivate.db";    std::string databaseFilePath = databaseDirectory();    databaseFilePath.append(isPrivateBrowsing ? kDatabaseFilenamePrivateBrowsing : kDatabaseFilename);    return databaseFilePath;}

※Android3.0以上是webviewCookiesChromium.db, 以下是WebView.db文件

8.最后读取Cookie情报发生在cookie_monster.cc。 额，最后调到C++， 去读.db文件，无敌了

[java] view plain copy print ?

1. std::string CookieMonster::GetCookiesWithOptions(const GURL& url,
2. const CookieOptions& options) {
3. base::AutoLock autolock(lock_);
4. InitIfNecessary();
6. if (!HasCookieableScheme(url)) {
7. return std::string();
8. }
10. TimeTicks start_time(TimeTicks::Now());
12. // Get the cookies for this host and its domain(s).
13. std::vector<CanonicalCookie*> cookies;
14. FindCookiesForHostAndDomain(url, options, true, &cookies);
15. std::sort(cookies.begin(), cookies.end(), CookieSorter);
17. std::string cookie_line;
18. for (std::vector<CanonicalCookie*>::const_iterator it = cookies.begin();
19. it != cookies.end(); ++it) {
20. if (it != cookies.begin())
21. cookie_line += "; ";
22. // In Mozilla if you set a cookie like AAAA, it will have an empty token
23. // and a value of AAAA. When it sends the cookie back, it will send AAAA,
24. // so we need to avoid sending =AAAA for a blank token value.
25. if (!(*it)->Name().empty())
26. cookie_line += (*it)->Name() + "=";
27. cookie_line += (*it)->Value();
28. }
30. histogram_time_get_->AddTime(TimeTicks::Now() - start_time);
32. VLOG(kVlogGetCookies) << "GetCookies() result: " << cookie_line;
34. return cookie_line;
35. }

std::string CookieMonster::GetCookiesWithOptions(const GURL& url,                                                 const CookieOptions& options) {  base::AutoLock autolock(lock_);  InitIfNecessary();  if (!HasCookieableScheme(url)) {    return std::string();  }  TimeTicks start_time(TimeTicks::Now());  // Get the cookies for this host and its domain(s).  std::vector<CanonicalCookie*> cookies;  FindCookiesForHostAndDomain(url, options, true, &cookies);  std::sort(cookies.begin(), cookies.end(), CookieSorter);  std::string cookie_line;  for (std::vector<CanonicalCookie*>::const_iterator it = cookies.begin();       it != cookies.end(); ++it) {    if (it != cookies.begin())      cookie_line += "; ";    // In Mozilla if you set a cookie like AAAA, it will have an empty token    // and a value of AAAA.  When it sends the cookie back, it will send AAAA,    // so we need to avoid sending =AAAA for a blank token value.    if (!(*it)->Name().empty())      cookie_line += (*it)->Name() + "=";    cookie_line += (*it)->Value();  }  histogram_time_get_->AddTime(TimeTicks::Now() - start_time);  VLOG(kVlogGetCookies) << "GetCookies() result: " << cookie_line;  return cookie_line;}

#以上#

更多相关文章

1. Android(安卓)Retrofit 源码系列（二）~ 自定义 CallAdapter
2. android6.0获取通讯录权限
3. [android UI]自定义各种UI，收集在此，以备后用！
4. Android(安卓)自定义弹窗提示
5. 基于Android的Word在线预览
6. Android(安卓)自定义适配器
7. Android的Shape图片资源，用于做些自定义样式的按钮等。
8. Android自定义布局通知栏
9. 细节决定成败----Android应用程序的优化（四）

随机推荐

1. 学习，是脱贫致富的捷径
2. HBase协处理器加载的三种方式
3. 是时候丢掉 onActivityResult 了 ！
4. 为什么说for...of是JS中的一颗宝石
5. 很多人不知道的Python 炫技操作：合并字典
6. 一文带你入门Java Stream流，太强了
7. 中心化交易所和去中心化交易所优势分别在
8. 一文让你彻底掌握 TS 枚举
9. 我去，你写的 switch 语句也太老土了吧
10. 从 SQL 到 MongoDB，这一篇就够了