使用RestTemplate访问https实现SSL请求操作

目录

• 1、添加HttpsClientRequestFactory工具类
• 2、修改RestTemplate
• 3、访问https，抛出的异常
• 方案一：替换jce包
• 方案二：升级 JDK到1.8版本（推荐方式）

方法1： 用java生成证书，不建议，移植性差。

方法2： 将RestTemplate改为https请求。

1、添加HttpsClientRequestFactory工具类

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的三个作用：
 * 	（1）身份认证
 * 		通过证书认证来确认对方的身份，防止中间人攻击
 * 	（2）数据私密性
 * 		使用对称性密钥加密传输的数据，由于密钥只有客户端/服务端有，其他人无法窥探。
 * 	（3）数据完整性
 * 		使用摘要算法对报文进行计算，收到消息后校验该值防止数据被篡改或丢失。
 *
 *     使用RestTemplate进行HTTPS请求访问：
 * 	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;
        }

        // 返回默认启用的密码套件。除非一个列表启用，对SSL连接的握手会使用这些密码套件。
        // 这些默认的服务的最低质量要求保密保护和服务器身份验证
        @Override
        public String[] getDefaultCipherSuites() {
            return delegate.getDefaultCipherSuites();
        }

        // 返回的密码套件可用于SSL连接启用的名字
        @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;
        }
    }
}

注意：服务端TLS版本要和客户端工具类中定义的一致。（TLSv1.2）

2、修改RestTemplate

在使用的时候，将

private static RestTemplate restTemplate = new RestTemplate();

改为：

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

其他代码不变。

也可使用注入的方式：

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

3、访问https，抛出的异常

javax.net.ssl.SSLHandshakeException: Received fatal alert: handshake_failure解决方案

因为jdk中jce的安全机制导致报的错，需要去oracle官网下载对应的jce包替换jdk中的jce包。

方案一：替换jce包

目录 %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的路径
US_export_policy.jar
local_policy.jar

方案二：升级 JDK到1.8版本（推荐方式）

// 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"

以上为个人经验，希望能给大家一个参考，也希望大家多多支持我们。