[Java知识库]java发送Post请求

通过json发送

 private String sendPostByJson(String url, Map<String, Object> params,
            Map<String, String> headers) {
        CloseableHttpClient httpclient = httpClient.getHttpClient();
        HttpPost post = new HttpPost(url);
        if (params != null && !params.isEmpty()) {
            List<Header> tmpHeaders = new ArrayList<>();
            tmpHeaders.add(
                    new BasicHeader("Content-Type", ContentType.APPLICATION_JSON.getMimeType()));
            if (headers != null) {
                headers.keySet().stream().forEach(key -> {
                    Header header = new BasicHeader(key, headers.get(key));
                    tmpHeaders.add(header);
                });
            }
            post.setHeaders(tmpHeaders.toArray(new Header[] {}));
            String json = ObjectMapperUtils.toJSON(params);
            StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);
            post.setEntity(entity);
        }
        int timeout = (int) TimeUnit.MINUTES.toMillis(3);
        RequestConfig timeOutRequestConfig = RequestConfig.custom().setSocketTimeout(timeout)
                .setConnectTimeout(timeout).setConnectionRequestTimeout(timeout).build();
        post.setConfig(timeOutRequestConfig);
        return execAndHandleThrowable(() -> {
            CloseableHttpResponse response = httpclient.execute(post);
            HttpEntity resEntity = response.getEntity();
            return EntityUtils.toString(resEntity, StandardCharsets.UTF_8);
        }, e -> logger.error(e.getMessage() + " when send json to server"));
    }