如果JSON数据很大或包含特殊字符，则在URL中编码整个JSON数据可能不切实际。最好使用POST请求而不是GET请求在请求体中传输JSON数据。如果有必要，你可以这样做：

public void sendData(String jsonData) throws URISyntaxException {
    RestTemplate restTemplate = new RestTemplate();

    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_JSON);

    String url = "https://yoururl.com/api?data=" + jsonData;
    RequestEntity<?> requestEntity = new RequestEntity<>(headers, HttpMethod.GET, new URI(url));

    ResponseEntity<String> responseEntity = restTemplate.exchange(requestEntity, String.class); // GET request
    String responseBody = responseEntity.getBody();

    // do your stuff
}