1. 问题

使用RestTemplate调用Http API时，服务器是TLS1.0，但是客户端Java默认禁止TLS1.0，会报错：org.springframework.web.client.ResourceAccessException: I/O error on POST request for “https://10.255.200.114/health”: The server selected protocol version TLS10 is not accepted by client preferences [TLS13, TLS12]; nested exception is javax.net.ssl.SSLHandshakeException: The server selected protocol version TLS10 is not accepted by client preferences [TLS13, TLS12]

2. 解决

• 修改java.security文件

  # 以MacOS为例
  vi /Library/Java/JavaVirtualMachines/zulu-11.jdk/Contents/Home/conf/security/java.security
  # 将TLSv1.0 从jdk.tls.disabledAlgorithms中删除
  jdk.tls.disabledAlgorithms=SSLv3, TLSv1.1, RC4, DES, MD5withRSA, \
  DH keySize < 1024, EC keySize < 224, 3DES_EDE_CBC, anon, NULL, \
  include jdk.disabled.namedCurves
  

• RestTemplate代码

  java">public RestTemplate restTemplate() {
      SSLConnectionSocketFactory scsf = null;
      try {
          scsf = new SSLConnectionSocketFactory(
                  SSLContexts.custom().loadTrustMaterial(null, new TrustSelfSignedStrategy()).build(),
                  NoopHostnameVerifier.INSTANCE);
      } catch (NoSuchAlgorithmException e) {
          throw new RuntimeException(e);
      } catch (KeyManagementException e) {
          throw new RuntimeException(e);
      } catch (KeyStoreException e) {
          throw new RuntimeException(e);
      }
      Registry<ConnectionSocketFactory> registry = RegistryBuilder.<ConnectionSocketFactory>create()
              .register("http", PlainConnectionSocketFactory.getSocketFactory())
              .register("https", scsf)
              .build();
      PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager(registry);
      connectionManager.setMaxTotal(200);
      connectionManager.setDefaultMaxPerRoute(100);
      connectionManager.setValidateAfterInactivity(1000);
      RequestConfig requestConfig = RequestConfig.custom()
              .setSocketTimeout(45000)
              .setConnectTimeout(45000)
              // Timeout waiting for connection from pool
              .setConnectionRequestTimeout(45000)
              .build();
  
      ClientHttpRequestFactory factory = new HttpComponentsClientHttpRequestFactory(HttpClientBuilder.create()
              .setDefaultRequestConfig(requestConfig)
              .setConnectionManager(connectionManager)
              .build());
      return new RestTemplate(factory);
  }