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

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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;

/**

* 第一步：执行方式:java InstallCert hostname

*         eg:java InstallCert www.cebbank.com

* 第二步：然后输入1并回车，会看到类似下面的打印信息

* 第三步：在当面目录下发现已经生成了一个名为jssecacerts的证书

* 第四步：将名为jssecacerts的证书拷贝\\%JAVA_HONME%\\jre\\lib\\security\\目录中

* 第五步：最后重启下应用的服务，证书就会生效了。。

* PS: 去掉中文注释执行，否则会报错！！！

* @author ligang

*

* 编译方式首先就java文件目录

* javac -d . InstallCert.java

* java com/ptengine/test/InstallCert localhost

*/

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);

}

}

}