Java发送Https和Http

http

• 使用HttpClient

  public static String doPostHttp(String url, JSONObject json) {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost(url);

        try {
            StringEntity se = new StringEntity(json.toString());
            se.setContentEncoding("UTF-8");
            //发送json数据需要设置contentType
            se.setContentType("application/json");
            //设置请求参数
            httpPost.setEntity(se);
            HttpResponse response = httpClient.execute(httpPost);
            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                //返回json格式
                String res = EntityUtils.toString(response.getEntity());
                return res;
            }
        } catch (Exception e) {
            logger.error("发起HTTP请求失败，出现异常, url:{}, json:{}", url, json.toJSONString(), e);
            logger.catching(e);
        } finally {
            if (httpClient != null) {
                try {
                    httpClient.close();
                } catch (IOException e) {
                    logger.error("发起HTTP请求失败，出现异常, url:{}, json:{}", url, json.toJSONString(), e);
                    logger.catching(e);
                }
            }
        }
        return null;
    }

https

发送https请求时，需要对证书做处理，有两种方式：
1、生成安全证书
2、跳过安全证书。

• 使用HttpClient

    public static String doPostHttps(String url, JSONObject json) {
        //创建post请求对象
        HttpPost httpPost = new HttpPost(url);
        //创建CloseableHttpClient对象（忽略证书的重点）
        CloseableHttpClient client = null;
        try {
            SSLConnectionSocketFactory scsf = new SSLConnectionSocketFactory(
                    SSLContexts.custom().loadTrustMaterial(null, new TrustSelfSignedStrategy()).build(),
                    NoopHostnameVerifier.INSTANCE);
            client = HttpClients.custom().setSSLSocketFactory(scsf).build();

        } catch (KeyManagementException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (KeyStoreException e) {
            e.printStackTrace();
        }
        try {
            //设置请求头
            httpPost.setEntity(new StringEntity(json.toString(), Charset.forName("utf-8")));
            //使用CloseableHttpClient发送请求
            CloseableHttpResponse response = client.execute(httpPost);
            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                //返回json格式
                String res = EntityUtils.toString(response.getEntity());
                return res;
            }
        } catch (IOException e) {
            logger.error("发起HTTPs请求失败，出现异常, url:{}, json:{}", url, json.toJSONString(), e);
            logger.catching(e);
        }
        if (client != null) {
            try {
                client.close();
            } catch (IOException e) {
                logger.error("发起HTTPs请求失败，出现异常, url:{}, json:{}", url, json.toJSONString(), e);
                logger.catching(e);
            }
        }
        return null;
    }