java 服务器获取https证书的问题 sun.security.validator.ValidatorException: PKIX path building failed: 1 新建一个InstallCert .java 类   import java.io.*; import java.net.URL;   import java.security.*; import java.security.cert.*;   import javax.net.ssl.*;   public class InstallCert {       public static void main(String[] args) throws Exception {     String host;     int port;     char[] passphrase;     if ((args.length == 1) || (args.length == 2)) {         String[] c = args[0].split(":");         host = c[0];         port = (c.length == 1) ? 443 : Integer.parseInt(c[1]);         String p = (args.length == 1) ? "changeit" : args[1];         passphrase = p.toCharArray();     } else {         System.out.println("Usage: java InstallCert [:port] [passphrase]");         return;     }       File file = new File("jssecacerts");     if (file.isFile() == false) {         char SEP = File.separatorChar;         File dir = new File(System.getProperty("java.home") + SEP             + "lib" + SEP + "security");         file = new File(dir, "jssecacerts");         if (file.isFile() == false) {         file = new File(dir, "cacerts");         }     }     System.out.println("Loading KeyStore " + file + "...");     InputStream in = new FileInputStream(file);     KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());     ks.load(in, passphrase);     in.close();       SSLContext context = SSLContext.getInstance("TLS");     TrustManagerFactory tmf =         TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());     tmf.init(ks);     X509TrustManager defaultTrustManager = (X509TrustManager)tmf.getTrustManagers()[0];     SavingTrustManager tm = new SavingTrustManager(defaultTrustManager);     context.init(null, new TrustManager[] {tm}, null);     SSLSocketFactory factory = context.getSocketFactory();       System.out.println("Opening connection to " + host + ":" + port + "...");     SSLSocket socket = (SSLSocket)factory.createSocket(host, port);     socket.setSoTimeout(10000);     try {         System.out.println("Starting SSL handshake...");         socket.startHandshake();         socket.close();         System.out.println();         System.out.println("No errors, certificate is already trusted");     } catch (SSLException e) {         System.out.println();         e.printStackTrace(System.out);     }       X509Certificate[] chain = tm.chain;     if (chain == null) {         System.out.println("Could not obtain server certificate chain");         return;     }       BufferedReader reader =         new BufferedReader(new InputStreamReader(System.in));       System.out.println();     System.out.println("Server sent " + chain.length + " certificate(s):");     System.out.println();     MessageDigest sha1 = MessageDigest.getInstance("SHA1");     MessageDigest md5 = MessageDigest.getInstance("MD5");     for (int i = 0; i < chain.length; i++) {         X509Certificate cert = chain[i];         System.out.println             (" " + (i + 1) + " Subject " + cert.getSubjectDN());         System.out.println("   Issuer  " + cert.getIssuerDN());         sha1.update(cert.getEncoded());         System.out.println("   sha1    " + toHexString(sha1.digest()));         md5.update(cert.getEncoded());         System.out.println("   md5     " + toHexString(md5.digest()));         System.out.println();     }       System.out.println("Enter certificate to add to trusted keystore or 'q' to quit: [1]");     String line = reader.readLine().trim();     int k;     try {         k = (line.length() == 0) ? 0 : Integer.parseInt(line) - 1;     } catch (NumberFormatException e) {         System.out.println("KeyStore not changed");         return;     }       X509Certificate cert = chain[k];     String alias = host + "-" + (k + 1);     ks.setCertificateEntry(alias, cert);       OutputStream out = new FileOutputStream("jssecacerts");     ks.store(out, passphrase);     out.close();       System.out.println();     System.out.println(cert);     System.out.println();     System.out.println         ("Added certificate to keystore 'jssecacerts' using alias '"         + alias + "'");     }       private static final char[] HEXDIGITS = "0123456789abcdef".toCharArray();       private static String toHexString(byte[] bytes) {     StringBuilder sb = new StringBuilder(bytes.length * 3);     for (int b : bytes) {         b &= 0xff;         sb.append(HEXDIGITS[b >> 4]);         sb.append(HEXDIGITS[b & 15]);         sb.append(' ');     }     return sb.toString();     }       private static class SavingTrustManager implements X509TrustManager {       private final X509TrustManager tm;     private X509Certificate[] chain;       SavingTrustManager(X509TrustManager tm) {         this.tm = tm;     }       public X509Certificate[] getAcceptedIssuers() {         throw new UnsupportedOperationException();     }       public void checkClientTrusted(X509Certificate[] chain, String authType)         throws CertificateException {         throw new UnsupportedOperationException();     }       public void checkServerTrusted(X509Certificate[] chain, String authType)         throws CertificateException {         this.chain = chain;         tm.checkServerTrusted(chain, authType);     }     }   } 2 放到服务器上随便一个文件夹就行 ,然后javac InstallCert .java 生成class文件 3 执行文件 java InstallCert 你的网址 ,例如  java InstallCert 192.168.1.137:8443 运行到如下结果   Server sent 2 certificate(s): 1 Subject CN=ecc.fedora.redhat.com, O=example.com, C=US Issuer CN=Certificate Shack, O=example.com, C=US sha1 2e 7f 76 9b 52 91 09 2e 5d 8f 6b 61 39 2d 5e 06 e4 d8 e9 c7 md5 dd d1 a8 03 d7 6c 4b 11 a7 3d 74 28 89 d0 67 54 2 Subject CN=Certificate Shack, O=example.com, C=US Issuer CN=Certificate Shack, O=example.com, C=US sha1 fb 58 a7 03 c4 4e 3b 0e e3 2c 40 2f 87 64 13 4d df e1 a1 a6 md5 72 a0 95 43 7e 41 88 18 ae 2f 6d 98 01 2c 89 68 Enter certificate to add to trusted keystore or 'q' to quit: [1] 直接输入1 会在相应的文件夹下生成 jssecacerts证书  然后将证书放到 将证书copy到$JAVA_HOME/jre/lib/security目录下 ,重起程序就会生效