服务器端通过session来得知连接的客户端，因此需要okhttp与webview使用一套cookie，就可以实现在H5页面中与原生app同步登陆。
通过阅读okhttp3源码得知，Okhttp是使用cookjar来设置cookie的，而在OKHttpClient的Builfer方法中.默认的cookjar是一个空的对象，没有设置任何cookie
/** A cookie jar that never accepts any cookies. */
CookieJar NO_COOKIES = new CookieJar() {
@Override public void saveFromResponse(HttpUrl url, List<Cookie> cookies) {
}
@Override public List<Cookie> loadForRequest(HttpUrl url) {
return Collections.emptyList();
}
};
所以只需要我们手动取得webview的cookie并设置在okhttp的cookJar上即可实现cookie的共享。webview是的引擎为webkit，在webkit是有cookieManager对cookie进行管理。
public class WebViewCookieHandler implements CookieJar {
private CookieManager mCookieManager = CookieManager.getInstance();
@Override
public void saveFromResponse(HttpUrl url, List<Cookie> cookies) {
String urlString = url.toString();
for (Cookie cookie : cookies) {
mCookieManager.setCookie(urlString, cookie.toString());
}
}
@Override
public List<Cookie> loadForRequest(HttpUrl url) {
String urlString = url.toString();
String cookiesString = mCookieManager.getCookie(urlString);
if (cookiesString != null && !cookiesString.isEmpty()) {
String[] cookieHeaders = cookiesString.split(";");
List<Cookie> cookies = new ArrayList<>(cookieHeaders.length);
for (String header : cookieHeaders) {
cookies.add(Cookie.parse(url, header));
}
return cookies;
}
return Collections.emptyList();
}
}
然后再创建okhttpclient的工具类中加上自定义的cookiejar
public static OKhttpClient getClient(){
return new OkhttpClient.Builder()
.cookieJar(new WebViewCookieHandler())
.build();
} 