解决 javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path buildin

最近在搞调第三方接口的问题，

遇到了一些问题。

从本地测试是通过的，

本地地址是http://ip:8080,

这种方式在本地上是可以，能够调通的。

后来放到线上，http改成了https，这个是安全的链路，所以后台就开始报错了，如下是部分错误

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
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

经过各种查找，发现解决方案，废话不多说，上代码：

/* * Copyright 2006 Sun Microsystems, Inc.  All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * *   - Redistributions of source code must retain the above copyright *     notice, this list of conditions and the following disclaimer. * *   - Redistributions in binary form must reproduce the above copyright *     notice, this list of conditions and the following disclaimer in the *     documentation and/or other materials provided with the distribution. * *   - Neither the name of Sun Microsystems nor the names of its *     contributors may be used to endorse or promote products derived *     from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ 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 <host>[: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);    }    } }

把上面这段代码copy出来，什么都不要改，包括package名，没有就不要加了，我是放到桌面上新建了一个跟类名相同的.java文件，然后用

编译：javac InstallCert.java 
运行：java InstallCert www.baidu.com

会生成一个jssecacerts

的文件

会看到如下信息：

java InstallCert ecc.fedora.redhat.comLoading KeyStore /usr/jdk/instances/jdk1.5.0/jre/lib/security/cacerts...Opening connection to ecc.fedora.redhat.com:443...Starting SSL handshake...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 targetat com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Alerts.java:150)at com.sun.net.ssl.internal.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1476)at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Handshaker.java:174)at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Handshaker.java:168)at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:846)at com.sun.net.ssl.internal.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:106)at com.sun.net.ssl.internal.ssl.Handshaker.processLoop(Handshaker.java:495)at com.sun.net.ssl.internal.ssl.Handshaker.process_record(Handshaker.java:433)at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:815)at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1025)at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1038)at InstallCert.main(InstallCert.java:63)Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested targetat sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:221)at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:145)at sun.security.validator.Validator.validate(Validator.java:203)at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:172)at InstallCert$SavingTrustManager.checkServerTrusted(InstallCert.java:158)at com.sun.net.ssl.internal.ssl.JsseX509TrustManager.checkServerTrusted(SSLContextImpl.java:320)at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:839)... 7 moreCaused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested targetat sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:236)at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:194)at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:216)... 13 moreServer 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 67 542 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 68Enter certificate to add to trusted keystore or 'q' to quit: [1]

3.输入1，然后直接回车，会在相应的目录下产生一个名为‘jssecacerts’的证书。将证书copy到$JAVA_HOME/jre/lib/security目录下，或者通过以下方式

System.setProperty("javax.net.ssl.trustStore", "D:\\UTA\\DOC_E_Health_XML\\Keystore\\jssecacerts

运行的时候不需要加https://

如果在CMD中无法编译或者无法运行，提示找不到这个主类的时候，需要配置一下环境变量，

环境变量的配置有问题，你改改吧：
JAVA_HOME是       D:\Java\jdk1.8.0_11
   Path是       %JAVA_HOME%\bin;%JAVA_HOME%\jre\bin
    CLASSPATH是  .;%JAVA_HOME%lib;%JAVA_HOME%lib\tools.jar

path和CLASSPATH里面的内容不能变，要按照这个来。home才指的是你安装jdk的路径

注意：如果一开始可以，过一会又不行了，建议看一下下面这个链接，看看可以不可以用用

http://blog.csdn.net/jay_1989/article/details/53183763