量化工

String url = "https://api.doctorxiong.club/v1/fund/rank";
        RestTemplate restTemplate = new RestTemplate();
        HttpHeaders headers = new HttpHeaders();
        MediaType type=MediaType.parseMediaType("application/json;charset=UTF-8");
        headers.setContentType(type);
        // MultiValueMap<String, String> map = new LinkedMultiValueMap<>(); -- 有博客中写道如果没有header要使用multiValuemap，有headers就要使用hashmap，尚未验证。
        HashMap<String, String> map = new HashMap<>();
        map.put("sort", "3n");
        map.put("fundScale", "1001");
        map.put("pageSize", "100");
        HttpEntity<HashMap<String,String>> request = new HttpEntity<>(map, headers); //HttpEntity里边封装了body和header
        ResponseEntity<String> response = restTemplate.postForEntity(url, request, String.class);
        System.out.println(response.getBody());