import org.springframework.http.client.SimpleClientHttpRequestFactory;
import javax.net.ssl.*;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.InetAddress;
import java.net.Socket;
import java.security.cert.X509Certificate;
 
/**
 * TLS的三個作用：
 * 	（1）身份認證
 * 		通過證書認證來確認對方的身份，防止中間人攻擊
 * 	（2）數(shù)據(jù)私密性
 * 		使用對稱性密鑰加密傳輸?shù)臄?shù)據(jù)，由于密鑰只有客戶端/服務端有，其他人無法窺探。
 * 	（3）數(shù)據(jù)完整性
 * 		使用摘要算法對報文進行計算，收到消息后校驗該值防止數(shù)據(jù)被篡改或丟失。
 *     
 *     使用RestTemplate進行HTTPS請求訪問：
 * 	private static RestTemplate restTemplate = new RestTemplate(new HttpsClientRequestFactory());
 * 
 */
public class HttpsClientRequestFactory extends SimpleClientHttpRequestFactory {
    @Override
    protected void prepareConnection(HttpURLConnection connection, String httpMethod) {
        try {
            if (!(connection instanceof HttpsURLConnection)) {
                throw new RuntimeException("An instance of HttpsURLConnection is expected");
            }
 
            HttpsURLConnection httpsConnection = (HttpsURLConnection) connection; 
            TrustManager[] trustAllCerts = new TrustManager[]{
                    new X509TrustManager() {
                        @Override
                        public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                            return null;
                        }
                        @Override
                        public void checkClientTrusted(X509Certificate[] certs, String authType) {
                        }
                        @Override
                        public void checkServerTrusted(X509Certificate[] certs, String authType) {
                        } 
                    }
            };
            SSLContext sslContext = SSLContext.getInstance("TLS");
            sslContext.init(null, trustAllCerts, new java.security.SecureRandom());
            httpsConnection.setSSLSocketFactory(new MyCustomSSLSocketFactory(sslContext.getSocketFactory()));
 
            httpsConnection.setHostnameVerifier(new HostnameVerifier() {
                @Override
                public boolean verify(String s, SSLSession sslSession) {
                    return true;
                }
            });
 
            super.prepareConnection(httpsConnection, httpMethod);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    private static class MyCustomSSLSocketFactory extends SSLSocketFactory { 
        private final SSLSocketFactory delegate; 
        public MyCustomSSLSocketFactory(SSLSocketFactory delegate) {
            this.delegate = delegate;
        }
 
        // 返回默認啟用的密碼套件。除非一個列表啟用，對SSL連接的握手會使用這些密碼套件。
        // 這些默認的服務的最低質量要求保密保護和服務器身份驗證
        @Override
        public String[] getDefaultCipherSuites() {
            return delegate.getDefaultCipherSuites();
        }
 
        // 返回的密碼套件可用于SSL連接啟用的名字
        @Override
        public String[] getSupportedCipherSuites() {
            return delegate.getSupportedCipherSuites();
        } 
 
        @Override
        public Socket createSocket(final Socket socket, final String host, final int port,
                                   final boolean autoClose) throws IOException {
            final Socket underlyingSocket = delegate.createSocket(socket, host, port, autoClose);
            return overrideProtocol(underlyingSocket);
        } 
 
        @Override
        public Socket createSocket(final String host, final int port) throws IOException {
            final Socket underlyingSocket = delegate.createSocket(host, port);
            return overrideProtocol(underlyingSocket);
        }
 
        @Override
        public Socket createSocket(final String host, final int port, final InetAddress localAddress,
                                   final int localPort) throws
                IOException {
            final Socket underlyingSocket = delegate.createSocket(host, port, localAddress, localPort);
            return overrideProtocol(underlyingSocket);
        }
 
        @Override
        public Socket createSocket(final InetAddress host, final int port) throws IOException {
            final Socket underlyingSocket = delegate.createSocket(host, port);
            return overrideProtocol(underlyingSocket);
        }
 
        @Override
        public Socket createSocket(final InetAddress host, final int port, final InetAddress localAddress,
                                   final int localPort) throws
                IOException {
            final Socket underlyingSocket = delegate.createSocket(host, port, localAddress, localPort);
            return overrideProtocol(underlyingSocket);
        }
 
        private Socket overrideProtocol(final Socket socket) {
            if (!(socket instanceof SSLSocket)) {
                throw new RuntimeException("An instance of SSLSocket is expected");
            }
            //((SSLSocket) socket).setEnabledProtocols(new String[]{"TLSv1.2"});
            ((SSLSocket) socket).setEnabledProtocols(new String[]{"TLSv1", "TLSv1.1", "TLSv1.2"});
            return socket;
        }
    }
}

private static RestTemplate restTemplate = new RestTemplate();

private static RestTemplate restTemplate = new RestTemplate(new HttpsClientRequestFactory());

@Configuration
public class ConfigBean {
 @Bean
 public RestTemplate getRestTemplate() {
  return new RestTemplate(new HttpsClientRequestFactory());
 }
}

目錄 %JAVA_HOME%\jre\lib\security里的local_policy.jar,US_export_policy.jar
JDK7 http://www.oracle.com/technetwork/java/javase/downloads/jce-7-download-432124.html
JDK8 http://www.oracle.com/technetwork/java/javase/downloads/jce8-download-2133166.html
 
// pub1:/home/myron/jdk1.7.0_80 % cd $JAVA_HOME/jre/lib/security/  //jce所在jdk的路徑
US_export_policy.jar
local_policy.jar

// pub1:/home/myron % vi .cshrc
setenv JAVA_HOME /home/myron/jdk1.8.0_211
// pub1:/home/myron % source .cshrc
// pub1:/home/myron % java -version
java version "1.8.0_211"