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

  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);
  }