package com;

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;

 /**

  * 从网站获取java所需的证书，调用时传入域名。

  */

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);

    }

    }  

}  

    /*

     * 设置证书。

     */

    static{

        javax.net.ssl.HttpsURLConnection.setDefaultHostnameVerifier(

                new javax.net.ssl.HostnameVerifier(){

                    public boolean verify(String hostname,

                            javax.net.ssl.SSLSession sslSession) {

                        //域名或ip地址

                        if (hostname.equals("www.baidu.com")) {

                            return true;

                        }

                        return false;

                    }

                });

        //第二个参数为证书的路径

        System.setProperty("javax.net.ssl.trustStore", "C:\\Program Files\\Java\\jdk1.7.0_45\\jre\\lib\\security\\jssecacerts");

        System.setProperty("javax.net.ssl.trustStorePassword", "changeit");

    }