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I have to do an application that shows an image of the medication packages. I've found this site that have some, but I'm trying to download the available images with a little program in Java but fails. I think HTTPS causes the issue.

There's a way to do it?

EDIT: code and error

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
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  • 1
    Show us the code and the error message you get. Commented Dec 17, 2014 at 12:42
  • 3
    I had no problem fetching the image via a curl call, show the code and error message Commented Dec 17, 2014 at 12:44
  • Possible duplicate of Download file from HTTPS server using Java Commented Nov 17, 2018 at 6:32

4 Answers 4

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Actually I had the similar problem. I was unable to download files from HTTPS server. Then I fixed this problem with this solution: 

// But are u denied access? // well here is the solution. public static void TheKing_DownloadFileFromURL(String search, String path) throws IOException { // This will get input data from the server InputStream inputStream = null; // This will read the data from the server; OutputStream outputStream = null; try { // This will open a socket from client to server URL url = new URL(search); // This user agent is for if the server wants real humans to visit String USER_AGENT = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36"; // This socket type will allow to set user_agent URLConnection con = url.openConnection(); // Setting the user agent con.setRequestProperty("User-Agent", USER_AGENT); //Getting content Length int contentLength = con.getContentLength(); System.out.println("File contentLength = " + contentLength + " bytes"); // Requesting input data from server inputStream = con.getInputStream(); // Open local file writer outputStream = new FileOutputStream(path); // Limiting byte written to file per loop byte[] buffer = new byte[2048]; // Increments file size int length; int downloaded = 0; // Looping until server finishes while ((length = inputStream.read(buffer)) != -1) { // Writing data outputStream.write(buffer, 0, length); downloaded+=length; //System.out.println("Downlad Status: " + (downloaded * 100) / (contentLength * 1.0) + "%"); } } catch (Exception ex) { //Logger.getLogger(WebCrawler.class.getName()).log(Level.SEVERE, null, ex); } // closing used resources // The computer will not be able to use the image // This is a must outputStream.close(); inputStream.close(); }

Hope this helps.... :)

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3

You need to set the permission to allow the server certificate. Here it explains how to set so that all cert are trusted.

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String relativePath = new File(System.getProperty("user.dir")).getAbsolutePath(); String url = "https://google.com"; //Imageoutput is folder within Project and ImageName is name for image String FileNameOutput = relativePath + File.separator + "ImageOutput" + File.separator + ImageName; //Just for console output Image Name and URL try(BufferedInputStream inputStream = new BufferedInputStream(new URL(url).openStream()); FileOutputStream fileOS = new FileOutputStream(FileNameOutput)) { byte data[] = new byte[4096]; int byteContent; while ((byteContent = inputStream.read(data, 0, 4096)) != -1) { //Write data to the location fileOS.write(data, 0, byteContent); } //Confirming Image is downloaded in the console }

This worked for me

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I think the root case is no ssl connection between your code and server

  • export the site cert
  • print your runtime JRE path via System.getProperties("java.home");

  • add the cert into runtime JRE as below:

  • cd jrepath\bin

  • keytool -keystore "jrepath\lib\security\cacerts" -import -alias ca -file "certpath"

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