一、java 获取https网站证书：
1、创建一个java工程，新建InstallCert类，将以下代码复制进去
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);
}
} }
InstallCert.java
2、eclipse 传入参数（需要获取证书的域名，例：www.baidu.com）运行main方法：
注：这里注意更改参数的类，不要弄错了。
3、点击 run 后控制台会报错，不用管：
在控制台输入 1 回车：
4、完成，会在工程目录下生成证书文件 jssecacerts
==================以上就是获取https网站证书的整个过程。======================
二、 调用https的webservice接口，如果不注册证书的话就会报错。下面是注册证书的步骤：
1、在需要调用webservice接口的类里加一个静态代码块：
/*
* 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");
}
2、将域名修改为获取证书的域名，这里是 www.baidu.com。
3、设置证书路径，我这里将获取到的证书复制到了jdk的security目录下了。这个目录为jdk的证书存放目录，建议将证书放到此目录。
4、完成，现在可以调用https的webservice接口了。
注：如果经过以上步骤后依然报错，请检查：
1、证书路径是否正确；
2、获取证书时候所填写的域名，是否是要调用的webservice接口的域名；
3、静态代码块里的域名，是否与获取证书的域名对应；