对“url”的POST请求出现I/O错误：连接被拒绝

Question

我正在使用rest模板调用外部系统，它在本地运行正常，没有任何超时设置，但在我的测试服务器上，它给了我以下错误：

“的POST请求时出现I/O错误”https://externalsystem/url“：连接被拒绝：连接；嵌套的异常是java。网ConnectException:连接被拒绝：连接

RestTemplate restTemplate = new RestTemplate();
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
MultiValueMap<String, String> map = new LinkedMultiValueMap<String, String>();
HttpEntity<MultiValueMap<String, String>> request = new 
HttpEntity<MultiValueMap<String, String>>(map, headers);
map.add("key", value);      
restTemplate.postForEntity(url, request, String.class);

Answer 1

我在JRE1上收到了这个问题。7，但与JDK 8配合良好。解决此问题的步骤

>

包括jar文件httpclient-4.5。2.jar和httpcore-4.4。4.jar

使用下面的代码来getRestTemboard：

public static RestTemplate getRestTemplate()
        throws KeyStoreException, NoSuchAlgorithmException, KeyManagementException {
    //TrustStrategy acceptingTrustStrategy = (X509Certificate[] chain, String authType) -> true;

    TrustStrategy acceptingTrustStrategy = new TrustStrategy() {

        public boolean isTrusted(
                final X509Certificate[] chain, String authType) throws CertificateException {
            // Oh, I am easy...
            return true;
        }

    };

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

    //SSLConnectionSocketFactory csf = new SSLConnectionSocketFactory(sslContext);

    SSLConnectionSocketFactory csf = new SSLConnectionSocketFactory(
            sslContext,new String[]{"TLSv1.2"},
            null,
            new NoopHostnameVerifier());

    CloseableHttpClient httpClient = HttpClients.custom().setSSLSocketFactory(csf).build();

    HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory();
    /*HttpComponentsClientHttpRequestFactory requestFactory 
    = new HttpComponentsClientHttpRequestFactory(
        HttpClientBuilder.create()
                .setProxy(new HttpHost("proxycacheST.hewitt.com", 3228, "http"))
                .build());*/

    requestFactory.setHttpClient(httpClient);
    RestTemplate restTemplate = new RestTemplate(requestFactory);
    return restTemplate;
}

步骤4：调用restTemplate.exchange（resturl， Httpmethod.POST，null，String.class）；

希望它会得到正确的结果

Answer 2

这当然是一个防火墙问题尝试设置主机代理及其端口，如下所示：

System.setProperty("proxyHost", "yourproxy.server");
System.setProperty("proxyPort", "portValue");