调用接口的方法，包括带证书的访问

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已于 2023-02-04 17:56:53 修改

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分类专栏：个人笔记 java开发 http请求文章标签： java spring boot

于 2018-10-23 10:43:09 首次发布

本文链接：https://blog.youkuaiyun.com/a309220728/article/details/83303401

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本文介绍了一种HTTP请求实现方式，特别强调了如何通过配置连接和读取超时时间来控制请求过程，同时提供了使用证书进行安全连接的选项。代码示例展示了如何使用Java创建一个仅请求一次且不进行重试的HTTP客户端。

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/**
     * 请求，只请求一次，不做重试
     * @param data
     * @param connectTimeoutMs
     * @param readTimeoutMs
     * @param useCert 是否使用证书
     * @return
     * @throws Exception
     */
    public static String requestOnce(final String url , String data, int connectTimeoutMs, int readTimeoutMs, boolean useCert) throws Exception {
        BasicHttpClientConnectionManager connManager;
        if (useCert) {
            // 证书
            char[] password = mch_id.toCharArray();
            InputStream certStream = getCertStream();
            KeyStore ks = KeyStore.getInstance("PKCS12");
            ks.load(certStream, password);

            // 实例化密钥库 & 初始化密钥工厂
            KeyManagerFactory kmf = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
            kmf.init(ks, password);

            // 创建 SSLContext
            SSLContext sslContext = SSLContext.getInstance("TLS");
            sslContext.init(kmf.getKeyManagers(), null, new SecureRandom());

            SSLConnectionSocketFactory sslConnectionSocketFactory = new SSLConnectionSocketFactory(
                    sslContext,
                    new String[]{"TLSv1"},
                    null,
                    new DefaultHostnameVerifier());

            connManager = new BasicHttpClientConnectionManager(
                    RegistryBuilder.<ConnectionSocketFactory>create()
                            .register("http", PlainConnectionSocketFactory.getSocketFactory())
                            .register("https", sslConnectionSocketFactory)
                            .build(),
                    null,
                    null,
                    null
            );
        }
        else {
            connManager = new BasicHttpClientConnectionManager(
                    RegistryBuilder.<ConnectionSocketFactory>create()
                            .register("http", PlainConnectionSocketFactory.getSocketFactory())
                            .register("https", SSLConnectionSocketFactory.getSocketFactory())
                            .build(),
                    null,
                    null,
                    null
            );
        }

        HttpClient httpClient = HttpClientBuilder.create()
                .setConnectionManager(connManager)
                .build();

        HttpPost httpPost = new HttpPost(url);

        RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(readTimeoutMs).setConnectTimeout(connectTimeoutMs).build();
        httpPost.setConfig(requestConfig);

        StringEntity postEntity = new StringEntity(data, "UTF-8");
        httpPost.addHeader("Content-Type", "text/xml");
        httpPost.addHeader("User-Agent", USER_AGENT );
        httpPost.setEntity(postEntity);

        HttpResponse httpResponse = httpClient.execute(httpPost);
        HttpEntity httpEntity = httpResponse.getEntity();
        return EntityUtils.toString(httpEntity, "UTF-8");

    }