restTemplate发送https请求报错I/O error on POST request for “xxxx“: Remote host terminated the handshake解决

最近在项目开发中遇到了一个问题，用restTemplate调用https接口的时候一直掉不通，报错I/O error on POST request for “xxxx”: Remote host terminated the handshake；nested exception is javax.net.ssl.SSLHandshakeException: Remote host terminated the handshake 远程主机终止了握手

一开始以为是SSL证书的问题。在百度上找了半天，千篇一律都是在RestTemplate实例化时加忽略证书。当然我也是加了忽略证书的，但是还是一直报那个错…

最后找到原因： 因为我访问的是国外的网站，我设置的代理ip是本机127.0.0.1；所以网络一直掉不通。

解决： 配置文件中将地址改为使用代理服务器的ip端口就可以了（没有可以买一个或者挂梯子）

下面附上完整的RestTemplateUtils实例化代码：

@Component
public class RestTemplateUtils {

    private static HttpProxyProperties httpProxyProperties;

    RestTemplateUtils(HttpProxyProperties properties) {
        httpProxyProperties = properties;
    }

    @SneakyThrows
    public static RestTemplate getInstance(String charset) {

        TrustStrategy acceptingTrustStrategy = (X509Certificate[] chain, String authType) -> true;

        //忽略证书
        SSLContext sslContext = org.apache.http.ssl.SSLContexts.custom()
            .loadTrustMaterial(null, acceptingTrustStrategy)
            .build();

        SSLConnectionSocketFactory csf = new SSLConnectionSocketFactory(sslContext);

        Registry<ConnectionSocketFactory> registry = RegistryBuilder.<ConnectionSocketFactory>create()
            .register("http", PlainConnectionSocketFactory.getSocketFactory())
            .register("https", csf)
            .build();
        PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager(registry);

        //连接池的最大连接数，0代表不限；如果取0，需要考虑连接泄露导致系统崩溃的后果
        connectionManager.setMaxTotal(1000);
        //每个路由的最大连接数,如果只调用一个地址,可以将其设置为最大连接数
        connectionManager.setDefaultMaxPerRoute(300);

        HttpClientBuilder clientBuilder = HttpClients.custom();
        if (Objects.nonNull(httpProxyProperties) && Boolean.TRUE.equals(httpProxyProperties.getEnabled())) {
            HttpHost proxy = new HttpHost(httpProxyProperties.getIp(), httpProxyProperties.getPort());
            clientBuilder.setProxy(proxy);
        }

        CloseableHttpClient httpClient = clientBuilder.setConnectionManager(connectionManager)
            .build();

        HttpComponentsClientHttpRequestFactory requestFactory =
            new HttpComponentsClientHttpRequestFactory();

        requestFactory.setHttpClient(httpClient);
        requestFactory.setConnectionRequestTimeout(10000);
        requestFactory.setConnectTimeout(10000);
        requestFactory.setReadTimeout(30000);

        RestTemplate restTemplate = new RestTemplate(requestFactory);
        List<HttpMessageConverter<?>> list = restTemplate.getMessageConverters();
        for (HttpMessageConverter<?> httpMessageConverter : list) {
            if (httpMessageConverter instanceof StringHttpMessageConverter) {
                ((StringHttpMessageConverter) httpMessageConverter).setDefaultCharset(Charset.forName(charset));
                break;
            }
        }
        return restTemplate;
    }

}

HttpProxyProperties代码：

@Data
@Component
@ConfigurationProperties(prefix = "http.proxy")
public class HttpProxyProperties {

    private Boolean enabled;

    private String ip;

    private Integer port;

}

使用：

private static RestTemplate restTemplate = RestTemplateUtils.getInstance("utf-8");

---

问题解决，希望能够帮到你