<dependency>
    <groupId>commons-httpclient</groupId>
    <artifactId>commons-httpclient</artifactId>
    <version>3.1</version>
</dependency>
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.3</version>
</dependency>
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpmime</artifactId>
    <version>4.5.3</version>
</dependency>

public class HttpComponentsClientRestfulHttpRequestFactory extends HttpComponentsClientHttpRequestFactory {
    @Override
    protected HttpUriRequest createHttpUriRequest(HttpMethod httpMethod, URI uri) {

        if (httpMethod == HttpMethod.GET) {
            return new HttpGetRequestWithEntity(uri);
        }
        return super.createHttpUriRequest(httpMethod, uri);
    }

    /**
     * 定义HttpGetRequestWithEntity实现HttpEntityEnclosingRequestBase抽象类，以支持GET请求携带body数据
     */

    private static final class HttpGetRequestWithEntity extends HttpEntityEnclosingRequestBase {
        public HttpGetRequestWithEntity(final URI uri) {
            super.setURI(uri);
        }

        @Override
        public String getMethod() {
            return HttpMethod.GET.name();

        }
    }
}

@Configuration
public class RestTemplateConfig {

    @Bean(name="remoteRestTemplate")
    public RestTemplate restTemplate(ClientHttpRequestFactory simpleClientHttpRequestFactory){
        RestTemplate restTemplate = new RestTemplate(simpleClientHttpRequestFactory);
        restTemplate.setRequestFactory(new HttpComponentsClientRestfulHttpRequestFactory());
        return restTemplate;
    }
    @Bean
    public ClientHttpRequestFactory simpleClientHttpRequestFactory(){
        SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
        factory.setConnectTimeout(60000);
        factory.setReadTimeout(20000);
        return factory;
    }
}

public ResponseEntity<Object> createCodeByNumber(String url, String boxSignerId) {
    JSONObject jsonObject = new JSONObject();
    jsonObject.put(BOXSIGNERID, boxSignerId);
    jsonObject.put(SECRET, secret);

    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_JSON);
    HttpEntity<String> httpEntity = new HttpEntity<>(JSON.toJSONString(jsonObject), headers);
    log.info("url:" + url + ",httpEntity:" + JSON.toJSONString(httpEntity));
    ResponseEntity<Object> response = restTemplate.exchange(url, HttpMethod.GET, httpEntity, Object.class);
    log.info("{}请求的返回内容:{}", url, JSON.parseObject(JSON.toJSONString(response.getBody())));
    return response;
}