从Java下载HTTPS URL中的图像

我必须做一个显示药物包装图像的应用程序。 我发现这个网站有一些，但我试图用Java中的一个小程序下载可用的图像但是失败了。 我认为HTTPS会导致问题。

有办法吗？

编辑：代码和错误

public class DescargarArchivo { public static void main(String[] args) { String url = "http://sofzh.miximages.com/java/visorCaratulas.aspxcod=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 

Answer 1

您需要设置允许服务器证书的权限。 这里解释了如何设置所有证书都是可信的。

Answer 2

其实我遇到了类似的问题。 我无法从HTTPS服务器下载文件。 然后我用这个解决方案修复了这个问题：

 // 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(); } 

希望这可以帮助…. ：）