英文状态下CookieManager setCookie Expires字段的识别
CookieManager cookieManager = CookieManager.getInstance();
String domain = ".bilibili.com";
String cookie1 = "bili_jct=b33fd713ea7cc6d29d65462794b28441; Domain=.bilibili.com; Expires=Expires=Sun, 18 Jan 1970 22:11:45 GMT+08:00";
String cookie2 = "bili_jct=49b9bcc2c21f19cc9dcb8382b84cf552; Domain=.bilibili.com; Expires=Expires=周日, 18 1月 1970 22:11:40 GMT+08:00";
cookieManager.setCookie(domain, cookie1);
String cookie1R = cookieManager.getCookie(domain);
Log.i("Cookie","load cookie1 "+cookie1R);
cookieManager.setCookie(domain, cookie2);
String cookie2R = cookieManager.getCookie(domain);
Log.i("Cookie","load cookie1 "+cookie2R);
输出
: load cookie1 null
: load cookie1 bili_jct=49b9bcc2c21f19cc9dcb8382b84cf552
问题原因就是英文状态是会识别Expires，所以在存入cookie1后CookieManager会认为这个cookie是过期的，所以会忽略掉这个cookie,返回null,但是在中文是不会识别Expires，所以可以返回cookie.
我尝试去跟踪了一下源码去发现为什么会出现这种情况
public abstract class CookieManager{
public abstract void setCookie(String url, String value);
}
CookieManager是一个抽象类,setCookie也是一个抽象方法，所以必需找到其实现类
public static CookieManager getInstance() {
return WebViewFactory.getProvider().getCookieManager();
}
进入getProvider
static WebViewFactoryProvider getProvider() {
synchronized (sProviderLock) {
// For now the main purpose of this function (and the factory abstraction) is to keep
// us honest and minimize usage of WebView internals when binding the proxy.
if (sProviderInstance != null) return sProviderInstance;
//代码省略
try {
Class<WebViewFactoryProvider> providerClass = getProviderClass();
Method staticFactory = null;
try {
staticFactory = providerClass.getMethod(
CHROMIUM_WEBVIEW_FACTORY_METHOD, WebViewDelegate.class);
} catch (Exception e) {
if (DEBUG) {
Log.w(LOGTAG, "error instantiating provider with static factory method", e);
}
}
Trace.traceBegin(Trace.TRACE_TAG_WEBVIEW, "WebViewFactoryProvider invocation");
try {
sProviderInstance = (WebViewFactoryProvider)
staticFactory.invoke(null, new WebViewDelegate());
if (DEBUG) Log.v(LOGTAG, "Loaded provider: " + sProviderInstance);
return sProviderInstance;
} catch (Exception e) {
Log.e(LOGTAG, "error instantiating provider", e);
throw new AndroidRuntimeException(e);
} finally {
Trace.traceEnd(Trace.TRACE_TAG_WEBVIEW);
}
} finally {
Trace.traceEnd(Trace.TRACE_TAG_WEBVIEW);
StrictMode.setThreadPolicy(oldPolicy);
}
}
}
可以看到sProviderInstance就是我们要的WebViewFactoryProvider，WebViewFactoryProvider是一个接口，它的创建实际上分为两步。
第一步：获取工厂类，这个工厂是用来创建WebViewFactoryProvider的实现类.
Class<WebViewFactoryProvider> providerClass = getProviderClass();
private static Class<WebViewFactoryProvider> getProviderClass() {
//代码省略
ClassLoader clazzLoader = webViewContext.getClassLoader();
return getWebViewProviderClass(clazzLoader);
}
public static Class<WebViewFactoryProvider> getWebViewProviderClass(ClassLoader clazzLoader)
throws ClassNotFoundException {
return (Class<WebViewFactoryProvider>) Class.forName(CHROMIUM_WEBVIEW_FACTORY,
true, clazzLoader);
}
private static final String CHROMIUM_WEBVIEW_FACTORY =
"com.android.webview.chromium.WebViewChromiumFactoryProviderForO";
WebViewChromiumFactoryProviderForO就是目前获取的工厂类.
第二步：通过WebViewFactoryProvider的工厂类（现在已经知道了是WebViewChromiumFactoryProviderForO）创建WebViewFactoryProvider的实现类
再回到getProvider中看看下面这些代码：
Method staticFactory = null;
try {
staticFactory = providerClass.getMethod(
CHROMIUM_WEBVIEW_FACTORY_METHOD, WebViewDelegate.class);
} catch (Exception e) {
if (DEBUG) {
Log.w(LOGTAG, "error instantiating provider with static factory method", e);
}
}
Trace.traceBegin(Trace.TRACE_TAG_WEBVIEW, "WebViewFactoryProvider invocation");
try {
sProviderInstance = (WebViewFactoryProvider)
staticFactory.invoke(null, new WebViewDelegate());
可以看出来它是通过反射WebViewChromiumFactoryProviderForO的CHROMIUM_WEBVIEW_FACTORY_METHOD方法获取WebViewFactoryProvider的实现类.
private static final String CHROMIUM_WEBVIEW_FACTORY_METHOD = "create";
源码中的CHROMIUM_WEBVIEW_FACTORY_METHOD是一个create函数.
Ok,我们现在找到了WebViewFactoryProvider的实现类是通过高反射WebViewChromiumFactoryProviderForO调用create创建的，那下面来看看WebViewChromiumFactoryProviderForO的源码怎么实现create.
class WebViewChromiumFactoryProviderForO extends WebViewChromiumFactoryProvider {
public static WebViewChromiumFactoryProvider create(android.webkit.WebViewDelegate delegate) {
return new WebViewChromiumFactoryProviderForO(delegate);
}
protected WebViewChromiumFactoryProviderForO(android.webkit.WebViewDelegate delegate) {
super(delegate);
}
}
可以看出来WebViewChromiumFactoryProviderForO的create方法创建的其实就是它自己，但是它的很多方法都是在父类里面的，我们需要跟进父类去看看getCookieManager到底返回的是什么，才能知道CookieManager的实现类是什么.
public class WebViewChromiumFactoryProvider implements WebViewFactoryProvider {
@Override
public CookieManager getCookieManager() {
synchronized (mLock) {
if (mCookieManager == null) {
if (!mStarted) {
// We can use CookieManager without starting Chromium; the native code
// will bring up just the parts it needs to make this work on a temporary
// basis until Chromium is started for real. The temporary cookie manager
// needs the application context to have been set.
ContentMain.initApplicationContext(mWebViewDelegate.getApplication());
}
mCookieManager = new CookieManagerAdapter(new AwCookieManager());
}
}
return mCookieManager;
}
}
WebViewChromiumFactoryProvider中的getCookieManager返回的是一个CookieManagerAdapter，这里终于找到了CookieManager的实现类是CookieManagerAdapter
继续看看CookieManagerAdapter的setCookie函数怎么实现的
public class CookieManagerAdapter extends CookieManager {
AwCookieManager mChromeCookieManager;
@Override
public void setCookie(String url, String value) {
try {
mChromeCookieManager.setCookie(fixupUrl(url), value);
} catch (ParseException e) {
Log.e(LOGTAG, "Not setting cookie due to error parsing URL: " + url, e);
}
}
}
@JNINamespace("android_webview")
public final class AwCookieManager {
/**
* Set cookie for a given url. The old cookie with same host/path/name will
* be removed. The new cookie will be added if it is not expired or it does
* not have expiration which implies it is session cookie.
* @param url The url which cookie is set for
* @param value The value for set-cookie: in http response header
*/
public void setCookie(final String url, final String value) {
nativeSetCookie(url, value);
}
private native void nativeSetCookie(String url, String value);
}
最终走到了一个nativeSetCookie方法，它是native方法. so,目前暂时也没有办法跟进了,目前只能从注释推断这其实中文情况下面expiration是无效的.
【附录】
资料图
需要资料的朋友可以加入Android架构交流QQ群聊：513088520
点击链接加入群聊【Android移动架构总群】：加入群聊
获取免费学习视频，学习大纲另外还有像高级UI、性能优化、架构师课程、NDK、混合式开发（ReactNative+Weex）等Android高阶开发资料免费分享。
