restTemplate

// 设置Http的Header
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON_UTF8);

// 设置访问参数
HashMap<String, Object> params = new HashMap<>();

// 设置访问的Entity
HttpEntity entity = new HttpEntity<>(params, headers);
ResponseEntity<String> result = null;
try {
    // 发起一个POST请求
    result = restTemplate.exchange(url, HttpMethod.POST, entity, String.class);
} catch (Exception e) {
    log.error("业务列表查询接口失败: " + e.getMessage());
}