Android中的WebView一般使用就是加载一个地址或者进行一些交互等等的操作，这些基本没什么难度。工作中有接触到了关于证书的一些操作，这里做一些记录。

1、WebView请求时携带证书

当我们使用的WebView需要进行证书校验的时候，我们需要把证书携带上。那我们怎么样才能携带我们的证书呢。
我们就需要使用 WebViewClient 了，当需要证书校验的时候，会执行 WebViewClient 的onReceivedClientCertRequest 方法。

@Override
    public void onReceivedClientCertRequest(WebView view, ClientCertRequest request) {

        try {
            PrivateKey privateKey = null;
            X509Certificate[] certificates = null;
            InputStream certificateFileStream = new ByteArrayInputStream(Base64.decode("您的证书内容", Base64.DEFAULT));
            KeyStore keyStore = KeyStore.getInstance("证书类型");
            String password = "您的证书密码";
            keyStore.load(certificateFileStream, password.toCharArray());

            Enumeration<String> aliases = keyStore.aliases();
            String alias = aliases.nextElement();

            Key key = keyStore.getKey(alias, password.toCharArray());
            if (key instanceof PrivateKey) {
                privateKey = (PrivateKey) key;
                Certificate cert = keyStore.getCertificate(alias);
                certificates = new X509Certificate[1];
                certificates[0] = (X509Certificate) cert;
            }

            certificateFileStream.close();
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
                request.proceed(privateKey, certificates);
            }
        } catch (Exception e) {
        }
    }

2、双向ssl认证

这里就不做多的介绍了，可以参考这篇文章https://blog.csdn.net/fengdezhudi/article/details/53436565，
作者介绍的很详细，感谢作者

package com.zx.webview_ssl;
 
import android.annotation.TargetApi;
import android.net.Uri;
import android.os.Build;
import android.webkit.WebResourceRequest;
import android.webkit.WebResourceResponse;
import android.webkit.WebView;
import android.webkit.WebViewClient;
 
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.security.KeyManagementException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.UnrecoverableKeyException;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
 
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.KeyManager;
import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;
 
public class SslWebViewClient extends WebViewClient {
 
    private SSLContext sslContext;
 
    public SslWebViewClient() {
        try {
            TrustManager[] trustManagers = prepareTrustManager(MyApplication.mContext.getResources().getAssets().open("zx_server.cer"));
            KeyManager[] keyManagers = prepareKeyManager(MyApplication.mContext.getResources().getAssets().open("zx_client.bks"), "123456");
            sslContext = SSLContext.getInstance("TLS");
            X509TrustManager trustManager = null;
            if (null != trustManagers){
                trustManager = new MyTrustManager(chooseTrustManager(trustManagers));
            }else {
                trustManager = new UnSafeTrustManager();
            }
            sslContext.init(keyManagers, new TrustManager[]{trustManager}, new SecureRandom());
        } catch (IOException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (KeyStoreException e) {
            e.printStackTrace();
        } catch (KeyManagementException e) {
            e.printStackTrace();
        }
    }
 
    @Override
    public WebResourceResponse shouldInterceptRequest(WebView view, String url) {
        return processRequest(Uri.parse(url));
    }
 
    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    @Override
    public WebResourceResponse shouldInterceptRequest(WebView view, WebResourceRequest request) {
        return processRequest(request.getUrl());
    }
 
    private WebResourceResponse processRequest(Uri uri) {
        try {
            //设置连接
            URL url = new URL(uri.toString());
            HttpsURLConnection urlConnection = (HttpsURLConnection) url.openConnection();
            //为request设置SSL Socket Factory
            urlConnection.setSSLSocketFactory(sslContext.getSocketFactory());
 
            urlConnection.setHostnameVerifier(new HostnameVerifier() {
                @Override
                public boolean verify(String hostname, SSLSession session) {
                    return true;
                }
            });
 
            //获取请求的内容、contentType、encoding
            InputStream inputStream = urlConnection.getInputStream();
            String contentType = urlConnection.getContentType();
            String encoding = urlConnection.getContentEncoding();
            if (null != contentType){
                String mimeType = contentType;
                if (contentType.contains(";")){
                    mimeType = contentType.split(";")[0].trim();
                }
                //返回新的response
                return new WebResourceResponse(mimeType, encoding, inputStream);
            }
 
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
 
    private TrustManager[] prepareTrustManager(InputStream... certificates) {
        if (certificates == null || certificates.length <= 0){
            return null;
        }
        try {
            CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");
            KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
            keyStore.load(null);
            int index = 0;
            for (InputStream certificate : certificates) {
                String certificateAlias = Integer.toString(index++);
                keyStore.setCertificateEntry(certificateAlias, certificateFactory.generateCertificate(certificate));
                try {
                    if (certificate != null)
                        certificate.close();
                } catch (IOException e){
 
                }
            }
            TrustManagerFactory trustManagerFactory = null;
            trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
            trustManagerFactory.init(keyStore);
            TrustManager[] trustManagers = trustManagerFactory.getTrustManagers();
            return trustManagers;
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (CertificateException e) {
            e.printStackTrace();
        } catch (KeyStoreException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
 
    }
 
    private KeyManager[] prepareKeyManager(InputStream bksFile, String password) {
        try {
            if (bksFile == null || password == null){
                return null;
            }
            KeyStore clientKeyStore = KeyStore.getInstance("BKS");
            clientKeyStore.load(bksFile, password.toCharArray());
            KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
            keyManagerFactory.init(clientKeyStore, password.toCharArray());
            return keyManagerFactory.getKeyManagers();
        } catch (KeyStoreException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnrecoverableKeyException e) {
            e.printStackTrace();
        } catch (CertificateException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
 
    private static X509TrustManager chooseTrustManager(TrustManager[] trustManagers) {
        for (TrustManager trustManager : trustManagers) {
            if (trustManager instanceof X509TrustManager) {
                return (X509TrustManager) trustManager;
            }
        }
        return null;
    }
 
    public static class MyTrustManager implements X509TrustManager{
        private X509TrustManager defaultTrustManager;
        private X509TrustManager localTrustManager;
 
        public MyTrustManager(X509TrustManager localTrustManager) throws NoSuchAlgorithmException, KeyStoreException {
            TrustManagerFactory var4 = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
            var4.init((KeyStore) null);
            defaultTrustManager = chooseTrustManager(var4.getTrustManagers());
            this.localTrustManager = localTrustManager;
        }
 
        @Override
        public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
 
        }
 
        @Override
        public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
            try {
                defaultTrustManager.checkServerTrusted(chain, authType);
            } catch (CertificateException ce) {
                localTrustManager.checkServerTrusted(chain, authType);
            }
        }
 
        @Override
        public X509Certificate[] getAcceptedIssuers() {
            return new X509Certificate[0];
        }
    }
 
    public static class UnSafeTrustManager implements X509TrustManager {
        @Override
        public void checkClientTrusted(X509Certificate[] chain, String authType)
                throws CertificateException {
        }
 
        @Override
        public void checkServerTrusted(X509Certificate[] chain, String authType)
                throws CertificateException {
        }
 
        @Override
        public X509Certificate[] getAcceptedIssuers() {
            return new java.security.cert.X509Certificate[]{};
        }
    }
 
 
}

3、设置cookie

因为有些地址需要我们提前设置cookie才能正确的访问，所以我们在loadUrl之前需要将cookie设置进去

public static void fillCookie(String url, Map<String, String> cookieMap) {

        CookieManager cookieManager = CookieManager.getInstance();
        CookieManager.getInstance().removeSessionCookies(value -> {

        });
        CookieManager.getInstance().setAcceptCookie(true);
        Set<String> keySet = cookieMap.keySet();
        String domain = "." + URLUtils.getDomainName(url);
        for (String key : keySet) {
            cookieManager.setCookie(domain, key+"="+cookieMap.get(key));
        }

        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
            CookieSyncManager.getInstance().sync();
        } else {
            cookieManager.flush();
        }
    }

fillCookie方法自动进行填充cookie，url是请求地址，cookieMap对应的是cookie的名称和具体参数，因为cookie会对应域名，所以我们解析了域名，下面是域名解析的工具类。

import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import java.util.regex.Pattern;

public class URLUtils {
    private final static Set<String> PublicSuffixSet = new HashSet<>(Arrays.asList("com|org|net|gov|edu|co|tv|mobi|info|asia|xxx|onion|cn|com.cn|edu.cn|gov.cn|net.cn|org.cn|jp|kr|tw|com.hk|hk|com.hk|org.hk|se|com.se|org.se".split("\\|")));

    private static Pattern IP_PATTERN = Pattern.compile("(\\d{1,3}\\.){3}(\\d{1,3})");

    /**
     * 获取url的顶级域名
     *
     * @param url
     * @return
     */
    public static String getDomainName(URL url) {
        String host = url.getHost();
        if (host.endsWith("."))
            host = host.substring(0, host.length() - 1);
        if (IP_PATTERN.matcher(host).matches())
            return host;

        int index = 0;
        String candidate = host;
        for (; index >= 0; ) {
            index = candidate.indexOf('.');
            String subCandidate = candidate.substring(index + 1);
            if (PublicSuffixSet.contains(subCandidate)) {
                return candidate;
            }
            candidate = subCandidate;
        }
        return candidate;
    }

    /**
     * 获取url的顶级域名
     *
     * @param url
     * @return
     * @throws MalformedURLException
     */
    public static String getDomainName(String url) {
        try {
            return getDomainName(new URL(url));
        } catch (Exception e) {
            return URI.create(url).getHost();
        }
    }
}

以上是一些工作时的记录，如果哪里有不对的地方请大家指正一下。