从 Java 中的 HTTPS URL 下载图像
问题我必须制作一个显示药包图像的应用程序。我发现这个网站有一些图片，但我尝试用Java语言的小程序下载可用的图片，但失败了。
我认为 HTTPS 是导致问题的原因。
有办法吗？
编辑：代码和错误
public class DescargarArchivo {
public static void main(String[] args) {
String url = "https://medicamentos.sanidadmadrid.org/comun/visorCaratulas.aspx?cod=672629";
String name = "test.jpg";
String folder = "downloads/";
File dir = new File(folder);
if (!dir.exists())
if (!dir.mkdir())
return;
File file = new File(folder + name);
try {
URLConnection conn = new URL(url).openConnection();
conn.connect();
System.out.println("\ndownload: \n");
System.out.println(">> URL: " + url);
System.out.println(">> Name: " + name);
System.out.println(">> size: " + conn.getContentLength()
+ " bytes");
InputStream in = conn.getInputStream();
OutputStream out = new FileOutputStream(file);
int b = 0;
while (b != -1) {
b = in.read();
if (b != -1)
out.write(b);
}
out.close();
in.close();
System.out.println("\ncomplete download\n");
} catch (MalformedURLException e) {
System.out.println("url: " + url + " invalid");
} catch (IOException e) {
e.printStackTrace();
}
}
}
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.ssl.Alerts.getSSLException(Unknown Source)
at sun.security.ssl.SSLSocketImpl.fatal(Unknown Source)
at sun.security.ssl.Handshaker.fatalSE(Unknown Source)
at sun.security.ssl.Handshaker.fatalSE(Unknown Source)
at sun.security.ssl.ClientHandshaker.serverCertificate(Unknown Source)
at sun.security.ssl.ClientHandshaker.processMessage(Unknown Source)
at sun.security.ssl.Handshaker.processLoop(Unknown Source)
at sun.security.ssl.Handshaker.process_record(Unknown Source)
at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source)
at sun.security.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
at sun.net.www.protocol.https.HttpsClient.afterConnect(Unknown Source)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown Source)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(Unknown Source)
at com.test.java.net.DescargarArchivo.main(DescargarArchivo.java:34)
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.validator.PKIXValidator.doBuild(Unknown Source)
at sun.security.validator.PKIXValidator.engineValidate(Unknown Source)
at sun.security.validator.Validator.validate(Unknown Source)
at sun.security.ssl.X509TrustManagerImpl.validate(Unknown Source)
at sun.security.ssl.X509TrustManagerImpl.checkTrusted(Unknown Source)
at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Source)
... 12 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.provider.certpath.SunCertPathBuilder.build(Unknown Source)
at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(Unknown Source)
at java.security.cert.CertPathBuilder.build(Unknown Source)
... 18 more
回答
您需要设置权限以允许服务器证书。在这里它解释了如何设置它，以便所有证书都是可信的。
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