PKIX：unable to find valid certification path to requested target 的问题

转   

https://blog.csdn.net/faye0412/article/details/6883879

问题的根本是：

缺少安全证书时出现的异常。

解决问题方法：

将你要访问的webservice/url....的安全认证证书导入到客户端即可。

类   

InstallCert

package io.renren;



import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.security.KeyStore;
import java.security.MessageDigest;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLException;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;

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);
        }
    }

}

类：   

MySecureProtocolSocketFactory

package io.renren;

import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;

import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;

import org.apache.commons.httpclient.ConnectTimeoutException;
import org.apache.commons.httpclient.HttpClientError;
import org.apache.commons.httpclient.params.HttpConnectionParams;
import org.apache.commons.httpclient.protocol.ControllerThreadSocketFactory;
import org.apache.commons.httpclient.protocol.SecureProtocolSocketFactory;

public class MySecureProtocolSocketFactory implements    SecureProtocolSocketFactory {

    private SSLContext sslContext = null;

    /**
     * Constructor for MySecureProtocolSocketFactory.
     */
    public MySecureProtocolSocketFactory() {
    }

    /**
     *
     * @return
     */
    private static SSLContext createEasySSLContext() {
        try {
            SSLContext context = SSLContext.getInstance("SSL");
            context.init(null, new TrustManager[] { new MyX509TrustManager() },
                    null);
            return context;
        } catch (Exception e) {
            throw new HttpClientError(e.toString());
        }
    }

    /**
     *
     * @return
     */
    private SSLContext getSSLContext() {
        if (this.sslContext == null) {
            this.sslContext = createEasySSLContext();
        }
        return this.sslContext;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.apache.commons.httpclient.protocol.ProtocolSocketFactory#createSocket(java.lang.String,
     *      int, java.net.InetAddress, int)
     */
    public Socket createSocket(String host, int port, InetAddress clientHost,
                               int clientPort) throws IOException, UnknownHostException {

        return getSSLContext().getSocketFactory().createSocket(host, port,
                clientHost, clientPort);
    }

    /*
     * (non-Javadoc)
     *
     * @see org.apache.commons.httpclient.protocol.ProtocolSocketFactory#createSocket(java.lang.String,
     *      int, java.net.InetAddress, int,
     *      org.apache.commons.httpclient.params.HttpConnectionParams)
     */
    public Socket createSocket(final String host, final int port,
                               final InetAddress localAddress, final int localPort,
                               final HttpConnectionParams params) throws IOException,
            UnknownHostException, ConnectTimeoutException {
        if (params == null) {
            throw new IllegalArgumentException("Parameters may not be null");
        }
        int timeout = params.getConnectionTimeout();
        if (timeout == 0) {
            return createSocket(host, port, localAddress, localPort);
        } else {
            return ControllerThreadSocketFactory.createSocket(this, host, port,
                    localAddress, localPort, timeout);
        }
    }

    /*
     * (non-Javadoc)
     *
     * @see SecureProtocolSocketFactory#createSocket(java.lang.String,int)
     */
    public Socket createSocket(String host, int port) throws IOException,
            UnknownHostException {
        return getSSLContext().getSocketFactory().createSocket(host, port);
    }

    /*
     * (non-Javadoc)
     *
     * @see SecureProtocolSocketFactory#createSocket(java.net.Socket,java.lang.String,int,boolean)
     */
    public Socket createSocket(Socket socket, String host, int port,
                               boolean autoClose) throws IOException, UnknownHostException {
        return getSSLContext().getSocketFactory().createSocket(socket, host,
                port, autoClose);
    }
}

类：  

X509TrustManager

package io.renren;

import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

import javax.net.ssl.X509TrustManager;

public class MyX509TrustManager implements X509TrustManager {

    /* (non-Javadoc)
     * @see javax.net.ssl.X509TrustManager#checkClientTrusted(java.security.cert.X509Certificate[], java.lang.String)
     */
    public void checkClientTrusted(X509Certificate[] arg0, String arg1)
            throws CertificateException {

    }

    /* (non-Javadoc)
     * @see javax.net.ssl.X509TrustManager#checkServerTrusted(java.security.cert.X509Certificate[], java.lang.String)
     */
    public void checkServerTrusted(X509Certificate[] arg0, String arg1)
            throws CertificateException {

    }

    /* (non-Javadoc)
     * @see javax.net.ssl.X509TrustManager#getAcceptedIssuers()
     */
    public X509Certificate[] getAcceptedIssuers() {
        return null;
    }

}

如果编译不了 。 就应该到当前目录的上一个目录进行编译运行。不用带https://

如：  F:\work\gitlab\renren-security\renren-admin\src\test\java> java io/renren/InstallCert wssb6.szsi.gov.cn

输入1，回车，然后会在当前的目录下产生一个名为“ssecacerts”的证书。

将证书拷贝到$JAVA_HOME/jre/lib/security目录下，或者通过以下方式：
System.setProperty("javax.net.ssl.trustStore", "你的jssecacerts证书路径"); //在connect前设置

static {
        try {
            System.setProperty("javax.net.ssl.trustStore", "F:\\work\\gitlab\\renren-security\\renren-admin\\src\\test\\java\\jssecacerts");

            ProtocolSocketFactory fcty = new MySecureProtocolSocketFactory();
            Protocol.registerProtocol("https", new Protocol("https", fcty, 443));
            HttpClient httpClient = new HttpClient();

            res =
                    Jsoup.connect(logURL)
                            .data("user","1111"

                                    ,"password","222220"
                                    ,"isIE","1"
                                    ,"type","1"
                            )
                            .method(Connection.Method.POST)
                            .execute();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

注意：因为是静态加载，所以要重新启动你的Web Server，证书才能生效。