使用Java从https获取图像
有没有办法使用Java从https网址获取图像?
到目前为止,我正在尝试:
URL url = new URL("https://ns6.host.md:8443/sitepreview/http/zugo.md/media/images/thumb/23812__yu400x250.jpg");System.out.println("Image: " + ImageIO.read(url));
但是,我得到:
Exception in thread "main" javax.imageio.IIOException: Can't get input stream from URL!Caused by: javax.net.ssl.SSLHandshakeException: java.security.cert.CertificateException: No
Caused by: java.security.cert.CertificateException: No name matching ns6.host.md found
我该如何处理?我必须提取该URL上的6k张图像以上。
回答:
有两个问题。您可以使用浏览器访问该网站,并查看错误。
服务器证书是自签名的,不受Java信任。您可以将其添加到信任库。
服务器证书与主机名“ ns6.host.md”不匹配,因此您需要一个
HostnameVerifier
忽略它的证书。
另一个答案也是如此,它提供了代码,不幸的是,它们使用了一些私有API。
如果有兴趣的话,如何在bayou HttpClient中解决该示例:https : //gist.github.com/zhong-j-
yu/22af353e2c5a5aed5857
public static void main(String[] args) throws Exception{
HttpClient client = new HttpClientConf()
.sslContext(new SslConf().trustAll().createContext()) // trust self-signed certs
.sslEngineConf(engine -> disableHostNameVerification(engine))
.trafficDump(System.out::print)
.newClient();
// typically, app creates one client and use it for all requests
String url = "https://ns6.host.md:8443/sitepreview/http/zugo.md/media/images/thumb/23812__yu400x250.jpg";
HttpResponse response = client.doGet(url).sync();
ByteBuffer bb = response.bodyBytes(Integer.MAX_VALUE).sync();
InputStream is = new ByteArrayInputStream(bb.array(), bb.arrayOffset()+bb.position(), bb.remaining());
BufferedImage image = ImageIO.read(is);
}
static void disableHostNameVerification(SSLEngine engine)
{
SSLParameters sslParameters = engine.getSSLParameters();
{
// by default, it's set to "HTTPS", and the server certificate must match the request host.
// disable it for this example, since the server certificate is ill constructed.
sslParameters.setEndpointIdentificationAlgorithm(null);
}
engine.setSSLParameters(sslParameters);
}
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