将Cookie从HttpURLConnection(java.net.CookieManager)传递到WebView(android.webkit.CookieManager)

Question

我已经看到了关于它应该如何与旧版本一起工作的答案,DefaultHttpClient 但是没有一个很好的例子HttpURLConnection

我正在使用HttpURLConnectionWeb应用程序发出请求.在我的Android应用程序开始时,我使用CookieHandler.setDefault(new CookieManager())自动处理会话cookie,这工作正常.

在登录后的某个时刻,我想用Web应用程序向用户显示实时页面WebView而不是在后台下载数据HttpURLConnection.但是,我想使用我之前建立的相同会话来防止用户再次登录.

如何复制饼干从java.net.CookieManager使用HttpURLConnection到android.webkit.CookieManager使用的WebView,所以我可以共享会话？

Answer 1

我想建议一个完全不同的方法来解决你的问题.我们不是将cookie从一个地方复制到另一个地方(手动同步),而是让HttpURLConnection和WebViews使用相同的 cookie存储.

这完全消除了同步的需要.任何一个更新的cookie都会立即自动反映在另一个中.

为此,创建自己的java.net.CookieManager实现,它将所有请求转发到WebViews的webkit android.webkit.CookieManager.

执行:

import java.io.IOException;
import java.net.CookieManager;
import java.net.CookiePolicy;
import java.net.CookieStore;
import java.net.URI;
import java.util.Arrays;
import java.util.List;
import java.util.Map;

public class WebkitCookieManagerProxy extends CookieManager 
{
    private android.webkit.CookieManager webkitCookieManager;

    public WebkitCookieManagerProxy()
    {
        this(null, null);
    }

    WebkitCookieManagerProxy(CookieStore store, CookiePolicy cookiePolicy)
    {
        super(null, cookiePolicy);

        this.webkitCookieManager = android.webkit.CookieManager.getInstance();
    }

    @Override
    public void put(URI uri, Map<String, List<String>> responseHeaders) throws IOException 
    {
        // make sure our args are valid
        if ((uri == null) || (responseHeaders == null)) return;

        // save our url once
        String url = uri.toString();

        // go over the headers
        for (String headerKey : responseHeaders.keySet()) 
        {
            // ignore headers which aren't cookie related
            if ((headerKey == null) || !(headerKey.equalsIgnoreCase("Set-Cookie2") || headerKey.equalsIgnoreCase("Set-Cookie"))) continue;

            // process each of the headers
            for (String headerValue : responseHeaders.get(headerKey))
            {
                this.webkitCookieManager.setCookie(url, headerValue);
            }
        }
    }

    @Override
    public Map<String, List<String>> get(URI uri, Map<String, List<String>> requestHeaders) throws IOException 
    {
        // make sure our args are valid
        if ((uri == null) || (requestHeaders == null)) throw new IllegalArgumentException("Argument is null");

        // save our url once
        String url = uri.toString();

        // prepare our response
        Map<String, List<String>> res = new java.util.HashMap<String, List<String>>();

        // get the cookie
        String cookie = this.webkitCookieManager.getCookie(url);

        // return it
        if (cookie != null) res.put("Cookie", Arrays.asList(cookie));
        return res;
    }

    @Override
    public CookieStore getCookieStore() 
    {
        // we don't want anyone to work with this cookie store directly
        throw new UnsupportedOperationException();
    }
}

最后通过在应用程序初始化时执行此操作来使用它:

android.webkit.CookieSyncManager.createInstance(appContext);
// unrelated, just make sure cookies are generally allowed
android.webkit.CookieManager.getInstance().setAcceptCookie(true);

// magic starts here
WebkitCookieManagerProxy coreCookieManager = new WebkitCookieManagerProxy(null, java.net.CookiePolicy.ACCEPT_ALL);
java.net.CookieHandler.setDefault(coreCookieManager);

Answer 2

与之相比DefaultHttpClient,还有一些额外的步骤.关键区别在于如何访问现有的cookie HTTPURLConnection:

1. 调用CookieHandler.getDefault()并将结果转换为java.net.CookieManager.
2. 使用cookie管理器,调用getCookieStore()访问cookie存储.
3. 使用cookie商店,调用get()以访问给定的cookie列表URI.

这是一个完整的例子:

@Override
protected void onCreate(Bundle savedInstanceState) {
    // Get cookie manager for WebView
    // This must occur before setContentView() instantiates your WebView
    android.webkit.CookieSyncManager webCookieSync =
        CookieSyncManager.createInstance(this);
    android.webkit.CookieManager webCookieManager =
        CookieManager.getInstance();
    webCookieManager.setAcceptCookie(true);

    // Get cookie manager for HttpURLConnection
    java.net.CookieStore rawCookieStore = ((java.net.CookieManager)
        CookieHandler.getDefault()).getCookieStore();

    // Construct URI
    java.net.URI baseUri = null;
    try {
        baseUri = new URI("http://www.example.com");
    } catch (URISyntaxException e) {
        // Handle invalid URI
        ...
    }

    // Copy cookies from HttpURLConnection to WebView
    List<HttpCookie> cookies = rawCookieStore.get(baseUri);
    String url = baseUri.toString();
    for (HttpCookie cookie : cookies) {
        String setCookie = new StringBuilder(cookie.toString())
            .append("; domain=").append(cookie.getDomain())
            .append("; path=").append(cookie.getPath())
            .toString();
        webCookieManager.setCookie(url, setCookie);
    }

    // Continue with onCreate
    ...
}

Answer 3

我用onCreate中的这一行神奇地解决了我所有的cookie问题:

CookieHandler.setDefault(new CookieManager());