應用htmlparser訪問https網站時，部分網站會出現PKIX path building failed問題，應是ssl未認證（瀏覽器直接訪問可以，可能是保存過對應證書），可從兩個方法解決，一個是從目標服務器下載有效證書，另一個是信任所有證書。

方法一：下載有效證書，InstallCert源碼如下

/** 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.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);}}} 編譯InstallCert.java，然后執行：java InstallCert hostname，比如： java InstallCert?www.rizhiyi.com

工程目錄下生成jssecacerts證書文件，在parser = new Parser(url)代碼前執行

System.setProperty("javax.net.ssl.trustStore", "工程目錄/jssecacerts");

方法二：信任所有證書

import java.net.URL; import java.security.cert.CertificateException; import java.security.cert.X509Certificate; import javax.net.ssl.HostnameVerifier; import javax.net.ssl.HttpsURLConnection; import javax.net.ssl.SSLContext; import javax.net.ssl.SSLSession; import javax.net.ssl.TrustManager; import javax.net.ssl.X509TrustManager;import org.htmlparser.Parser; import org.htmlparser.visitors.TextExtractingVisitor;public class SslUtils {private static void trustAllHttpsCertificates() throws Exception {TrustManager[] trustAllCerts = new TrustManager[1];TrustManager tm = new miTM();trustAllCerts[0] = tm;SSLContext sc = SSLContext.getInstance("SSL");sc.init(null, trustAllCerts, null);HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());}static class miTM implements TrustManager,X509TrustManager {public X509Certificate[] getAcceptedIssuers() {return null;}public boolean isServerTrusted(X509Certificate[] certs) {return true;}public boolean isClientTrusted(X509Certificate[] certs) {return true;}public void checkServerTrusted(X509Certificate[] certs, String authType)throws CertificateException {return;}public void checkClientTrusted(X509Certificate[] certs, String authType)throws CertificateException {return;}}/*** 忽略HTTPS請求的SSL證書* @throws Exception*/public static void ignoreSsl() throws Exception{HostnameVerifier hv = new HostnameVerifier() {public boolean verify(String urlHostName, SSLSession session) {System.out.println("Warning: URL Host: " + urlHostName + " vs. " + session.getPeerHost());return true;}};trustAllHttpsCertificates();HttpsURLConnection.setDefaultHostnameVerifier(hv);}public static void main(String[] args) throws Exception {URL u = new URL("https://www.rizhiyi.com/");if("https".equalsIgnoreCase(u.getProtocol())){SslUtils.ignoreSsl();}Parser parser;parser = new Parser(u.toString());parser.setEncoding("UTF-8");TextExtractingVisitor tev=new TextExtractingVisitor();parser.visitAllNodesWith(tev);String body=tev.getExtractedText();System.out.println(body);} }

總結

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