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作者：funnyZpC
出处：cnblogs.com/funnyzpc/p/10989813.html

最近接一外部接口，接口在本地开发调试及测试都无任何问题(windows下)，而上测试环境后测第一次就直接报错误，

错误是这样子的：

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(Alerts.java:192)        at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1917)        at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:301)        at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:295)        at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1369)        at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:156)        at sun.security.ssl.Handshaker.processLoop(Handshaker.java:925)        at sun.security.ssl.Handshaker.process_record(Handshaker.java:860)        at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1043)        at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1343)        at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1371)        at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1355)

enn~,首先那个接口地址是https的，服务器是linux的。

以上错误其大意是无法找到及验证有效证书，再想想：不对啊，本地jdk和服务器的jdk都是oracle官方jdk 1.8呀，照理说本地调试没问题在服务端应该也不会有什么问题呢～

诶～，不管怎么分析都还是要解决问题呀，首先我分析到这又两个问题点：

• 本地和服务器OS不一致

• 接口地址的SSL证书存在不兼容或其他问题

怎么办？要求对方检查证书配置，可能性不大，剩下的就只剩下一种方式：做兼容，就是在请求的时候信任对方的证书。

于是有了第一版。

因为我使用的是CloseableHttpClient，做的请求管理，不如在让CloseableHttpClient兼容https与http不就好了，寻思一项，搜索一番代码即成(这里只给出核心代码)

// 之前// private static CloseableHttpClient httpClient = HttpClients.custom().build();

// 之后private static CloseableHttpClient httpClient;static {    try {        System.out.println("===>01");        // 忽略证书        SSLContextBuilder SslBuilder = new SSLContextBuilder().loadTrustMaterial(null, new TrustSelfSignedStrategy());        //不进行主机名验证        SSLConnectionSocketFactory sslConnectionSocketFactory = new SSLConnectionSocketFactory(SslBuilder.build(), NoopHostnameVerifier.INSTANCE);        Registry registry = RegistryBuilder.create()                .register("http", new PlainConnectionSocketFactory())                .register("https", sslConnectionSocketFactory)                .build();        PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager(registry);        cm.setMaxTotal(100);        httpClient = HttpClients.custom()                .setSSLSocketFactory(sslConnectionSocketFactory)                .setDefaultCookieStore(new BasicCookieStore())                .setConnectionManager(cm).build();    } catch (Exception e) {        e.printStackTrace();        System.out.println("===>02");        httpClient = HttpClients.custom().build();        }    }}    

bingo ～，上线测 。。。

oh～，no，依然是这个错：

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(Alerts.java:192) ......

待我分析一番，发现上面的代码仅仅只是为了不验证对方主机，完全没有理会证书的错误。。。

欸～，这是个问题。

后我又想起之前上上家公司也有出现过这个问题，哈～，有办法了，找到源码把主要的几句copy过来走走不就好了。

于是，第二版

核心代码：

HostnameVerifier hv = new HostnameVerifier() {

    public boolean verify(String urlHostName, SSLSession session) {        return true;    }

};

private static void trustAllHttpsCertificates() throws Exception {   javax.net.ssl.TrustManager[] trustAllCerts = new javax.net.ssl.TrustManager[1];   javax.net.ssl.TrustManager tm = new miTM();   trustAllCerts[0] = tm;   javax.net.ssl.SSLContext sc = javax.net.ssl.SSLContext   .getInstance("SSL");   sc.init(null, trustAllCerts, null);   javax.net.ssl.HttpsURLConnection.setDefaultSSLSocketFactory(sc   .getSocketFactory());}

static class miTM implements javax.net.ssl.TrustManager,javax.net.ssl.X509TrustManager {   public java.security.cert.X509Certificate[] getAcceptedIssuers() {   return null;}

public boolean isServerTrusted(   java.security.cert.X509Certificate[] certs) {   return true;}

public boolean isClientTrusted(   java.security.cert.X509Certificate[] certs) {   return true;}

public void checkServerTrusted(   java.security.cert.X509Certificate[] certs, String authType)   throws java.security.cert.CertificateException {   return;}

public void checkClientTrusted(   java.security.cert.X509Certificate[] certs, String authType)   throws java.security.cert.CertificateException {      return;   }}

// 在访问前调用trustAllHttpsCertificates();HttpsURLConnection.setDefaultHostnameVerifier(hv);

一整折腾后上线部署测试，啊～，还是同样的错误。。。

分析代码，看到，这种处理逻辑只针对自定义SSL证书有效，对于我现有的情况丁点问题都解决不了。

终版

其实业务代码的什么都没改，只是给jdk添加了点儿东西。

主要解决思路是让jdk忽略指定域名的SSL证书。《图解 https 单向认证和双向认证！》推荐看下。

//InstallCert.java

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         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);    }    }}

具体解决步骤：

• 编译文件

• javac InstallCert.java

• 添加信任

• java InstallCert 域名地址

• 上传证书(需手动将网站证书导出)

• rz => 证书.cer

• 导入证书(密码：changeit)

• echo $JAVA_HOME

• keytool -import -alias LL1 -keystore $JAVA_HOME/jre/lib/security/cacerts -file /home/证书.cer

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