Android中Cookie的应用与管理

在Android应用中，处理用户的登录状态通常涉及到COOKIE的管理和使用。以下是如何在登录时获取COOKIE，并将这些COOKIE应用于WebView中，确保用户在浏览网页时保持登录状态。

首先，在用户登录时，我们需要从服务器响应中提取COOKIE：

String COOKIE = "";
URL url = new URL(HttpUrlConnection.MYURL + "loginAPP.i?username=" + GinsengSharedPreferences.read(LoginActivity.this, "logininfo", "userName") + "&password=" + GinsengSharedPreferences.read(LoginActivity.this, "logininfo", "password"));
HttpURLConnection cOnnection= (HttpURLConnection) url.openConnection();
// 获取Session ID
String COOKIEValue = connection.getHeaderField("Set-COOKIE");
if (COOKIEValue != null) {
    String sessiOnId= COOKIEValue.substring(0, COOKIEValue.indexOf(";"));
    COOKIE = COOKIEValue;
    Map map = new HashMap<>();
    map.put("COOKIE", COOKIE);
    GinsengSharedPreferences.write(LoginActivity.this, "logininfo", map);
}

接下来，在WebView中加载网页之前，我们需要确保将上述获取到的COOKIE同步到WebView中：

webView = (WebView) findViewById(R.id.webview);
WebSettings settings = webView.getSettings();
// 启用Javascript
settings.setJavascriptEnabled(true);
// 允许访问文件
settings.setAllowFileAccess(true);
// 支持缩放
settings.setBuiltInZoomControls(true);
// 适应手机屏幕
settings.setUseWideViewPort(true);
syncCOOKIEs(DianziJiangAddActivity.this, HttpUrlConnection.MYURL + "loginAPP.i?username=" + GinsengSharedPreferences.read(DianziJiangAddActivity.this, "logininfo", "userName") + "&password=" + GinsengSharedPreferences.read(DianziJiangAddActivity.this, "logininfo", "password"));
webView.loadUrl(HttpUrlConnection.getMyUrl() + "/pjz-classdong.i?uid=" + GinsengSharedPreferences.read(this, "logininfo", "userId"));
webView.setWebViewClient(new MyWebViewClient());

以下是同步COOKIE的具体实现方法：

public static void syncCOOKIEs(Context context, String url) {
    COOKIESyncManager.createInstance(context);
    COOKIEManager COOKIEManager = COOKIEManager.getInstance();
    COOKIEManager.setAcceptCOOKIE(true);
    COOKIEManager.setCOOKIE(url, GinsengSharedPreferences.read(context, "logininfo", "COOKIE"));
    COOKIESyncManager.getInstance().sync();
}

最后，为了更好地控制WebView的行为，我们自定义了一个WebViewClient类：

private class MyWebViewClient extends WebViewClient {
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        view.loadUrl(url);
        return true;
    }
}