此代码包含普通get，post请求和下载，代码如下：

@Configuration
public class RestTemplateConfig {@Beanpublic RestTemplate restTemplate() {return new RestTemplate();}}

@Data
public class CustomButtonRequestDto {@ApiModelProperty(value = "接口请求路径", required = true)private String url;@ApiModelProperty(value = "接口请求方式", required = true)private String requestMethod;@ApiModelProperty(value = "请求头信息")private Map<String, String> headers;@ApiModelProperty(value = "接口请求参数")private Map<String, Object> parameters;@ApiModelProperty(value = "get请求时必传:普通请求 DEFAULT,下载请求 DOWNLOAD")private String interfaceType;@ApiModelProperty(value = "post请求时 需要直接传集合时: LIST")private String parameterPassingModeFlag;
}

@Slf4j
@Service
public class CustomButtonService {@Autowiredprivate RestTemplate restTemplate;public Object customButtonRequest(CustomButtonRequestDto customButtonRequestDto,HttpServletRequest request) {log.info("自定义按钮请求接口customButtonRequestDto:{}", JSONObject.toJSON(customButtonRequestDto));String requestMethod = customButtonRequestDto.getRequestMethod();if (StringUtils.isEmpty(requestMethod)) {return null;}Map<String, String> header = customButtonRequestDto.getHeaders();Map<String, Object> parameters = customButtonRequestDto.getParameters();String url = customButtonRequestDto.getUrl();HttpHeaders headers = new HttpHeaders();headers.setContentType(MediaType.APPLICATION_JSON);headers.set("Accept", "application/json");headers.set("Authorization", request.getHeader("Authorization"));headers.set("loginName", request.getHeader("loginName"));headers.set("Brand",request.getHeader("Brand"));switch (requestMethod) {case "get":setHeader(header, headers);try {StrBuilder strParam = StrBuilder.create();String strUrlParam = "";String urlParamPlaceholder = "";if (MapUtil.isNotEmpty(parameters)) {if (url.contains("?")) {Iterator<Map.Entry<String, Object>> iterator = parameters.entrySet().iterator();while (iterator.hasNext()) {Map.Entry<String, Object> entry = iterator.next();if (entry.getValue() instanceof Collection) {urlParamPlaceholder = new Gson().toJson(entry.getValue());strParam.append("&").append("selectedFields").append("=").append("{urlParamPlaceholder}");} else {strParam.append("&").append(entry.getKey()).append("=").append(entry.getValue());}}strUrlParam = strParam.toString();} else {strParam.append("?");Iterator<Map.Entry<String, Object>> iterator = parameters.entrySet().iterator();while (iterator.hasNext()) {Map.Entry<String, Object> entry = iterator.next();if (entry.getValue() instanceof Collection) {urlParamPlaceholder = new Gson().toJson(entry.getValue());strParam.append("selectedFields").append("=").append("{urlParamPlaceholder}").append("&");} else {strParam.append(entry.getKey()).append("=").append(entry.getValue()).append("&");}}strUrlParam = StrUtil.removeSuffix(strParam, "&");}}// 普通get请求接口log.info("get请求接口开始");if (StringUtils.isNotEmpty(customButtonRequestDto.getInterfaceType()) && "DEFAULT".equals(customButtonRequestDto.getInterfaceType())) {HttpEntity<String> getHttpEntity = new HttpEntity<>(null, headers);ResponseEntity<String> getResponse = restTemplate.exchange(url + strUrlParam, HttpMethod.GET, getHttpEntity, String.class, urlParamPlaceholder);return getResponse.getBody();}// 下载get请求接口if (StringUtils.isNotEmpty(customButtonRequestDto.getInterfaceType()) && "DOWNLOAD".equals(customButtonRequestDto.getInterfaceType())) {HttpEntity<MultiValueMap<String, Object>> getHttpEntity = new HttpEntity<MultiValueMap<String, Object>>(null, headers);ResponseEntity<byte[]> getResponse = restTemplate.exchange(url + strUrlParam, HttpMethod.GET, getHttpEntity, byte[].class);return getResponse;}} catch (Exception e) {log.info("异常信息：{}", e);if(e instanceof HttpClientErrorException){throw e;}return Response.buildFailure();}case "post":setHeader(header, headers);if (StringUtils.isNotEmpty(customButtonRequestDto.getInterfaceType()) && "DOWNLOAD".equals(customButtonRequestDto.getInterfaceType())) {if (StringUtils.isNotBlank(customButtonRequestDto.getParameterPassingModeFlag()) && customButtonRequestDto.getParameterPassingModeFlag().equals("LIST")) {HttpEntity postHttpEntity = new HttpEntity<>(MapUtil.isNotEmpty(parameters) ? parameters.get("selectedFields") : "", headers);ResponseEntity<byte[]> responseEntity = restTemplate.exchange(url, HttpMethod.POST, postHttpEntity, byte[].class);return responseEntity;}HttpEntity postHttpEntity = new HttpEntity<>(MapUtil.isNotEmpty(parameters) ? parameters : "", headers);ResponseEntity<byte[]> responseEntity = restTemplate.exchange(url, HttpMethod.POST, postHttpEntity, byte[].class);return responseEntity;} else {if (StringUtils.isNotBlank(customButtonRequestDto.getParameterPassingModeFlag()) && customButtonRequestDto.getParameterPassingModeFlag().equals("LIST")) {HttpEntity postHttpEntity = new HttpEntity<>(MapUtil.isNotEmpty(parameters) ? parameters.get("selectedFields") : "", headers);String jsonObject = restTemplate.postForObject(url, postHttpEntity, String.class);return jsonObject;}HttpEntity postHttpEntity = new HttpEntity<>(MapUtil.isNotEmpty(parameters) ? parameters : "", headers);String jsonObject = restTemplate.postForObject(url, postHttpEntity, String.class);return jsonObject;}default:return null;}}private static void setHeader(Map<String, String> header, HttpHeaders headers) {if (MapUtil.isNotEmpty(header)) {Iterator<Map.Entry<String, String>> iterator = header.entrySet().iterator();while (iterator.hasNext()) {Map.Entry<String, String> entry = iterator.next();headers.set(entry.getKey(), entry.getValue());}}}
}