Question

好日子好朋友，在我的微服务和spring-boot应用程序中，我有一个前端员工微服务，它消耗了另一个带有文件上传端点的微服务。调用服务基于Spring rest控制器，我试图在Spring Boot应用程序中使用RestTemplate来使用File-Upload端点。简而言之，尝试上传PDF文件。

我已经探索了以下SO帖子，但它不适合我：

jackson disable fail_on_empty_beans

我在邮递员中测试这个并收到以下错误：

org.springframework.http.converter.HttpMessageNotWritableException：无法写入内容：找不到类java.io.FileDescriptor的序列化程序，也没有发现创建BeanSerializer的属性。

任何帮助将不胜感激....

以下是主要组成部分 -

休息控制器############

        @RestController          
        @RequestMapping(path = “/employee”)          

        public class EmployeeController {
            private EmployeeService empService;

            @RequestMapping(value =“/emp/load”, method = RequestMethod.POST)

public
            @ResponseBody
            ResponseEntity<byte[]> handleFileUpload(         @RequestParam("file") MultipartFile file, @RequestParam String a, @RequestParam String b, @RequestParam String c, @RequestParam String d, @RequestParam String e) throws Exception {         

return empService.handleFileUpload(file, a, b, c, d, e);     

            }
        }

服务实施

     @Service             
     public class EmployeeServiceImpl implements EmployeeService{                      @Value(“${emp.base.url}")                 

    private String EMP_BASE_URI;     

public ResponseEntity<byte[]>handleFileUpload(MultipartFile file, String a, String b, String c, String d, String e) {     

final String uri = EMP_BASE_URI + "/upload";     

            RestTemplate restTemplate = getMappedRestTemplate();     

            MultiValueMap<String, Object> params = new LinkedMultiValueMap<String, Object>();     

            params.add("file", file);     

            params.add(“a”, a);
                 
            params.add(“b”, b);     

            params.add(“c”, c);
                 
            params.add(“d”, d);     

            params.add(“e”, e);

            HttpHeaders headers = new HttpHeaders();     

            headers.set("Content-Type", "multipart/form-data");

            ResponseEntity<byte[]> response = restTemplate.exchange(uri, HttpMethod.POST, new HttpEntity<>(params, headers), byte[].class);

            return new ResponseEntity<>(response.getBody(), response.getStatusCode());
        }                                                             




     private RestTemplate getMappedRestTemplate(){         

                RestTemplate restTemplate = new RestTemplate();         

                ObjectMapper newObjectMapper = new ObjectMapper();

                         newObjectMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS,false);
                         
                newObjectMapper.setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY);         

                MappingJackson2HttpMessageConverter mappingJacksonHttpMessageConverter=new MappingJackson2HttpMessageConverter();

                FormHttpMessageConverter formConvertor = new FormHttpMessageConverter();
                         
                restTemplate.getMessageConverters().add(formConvertor);         

                restTemplate.getMessageConverters().add(mappingJacksonHttpMessageConverter);

                restTemplate.getMessageConverters().add(new StringHttpMessageConverter());
                         
                return restTemplate;         
            }
    }

我收到以下错误：

无法写入HTTP消息：org.springframework.http.converter.HttpMessageNotWritableException：无法写入内容：找不到类java.io.FileDescriptor的序列化程序，也没有发现创建BeanSerializer的属性（为了避免异常，请禁用SerializationFeature.FAIL_ON_EMPTY_BEANS ））（通过引用链：org.springframework.web.multipart.support.StandardMultipartFile [“inputStream”] - ＆gt; java.io.FileInputStream [“fd”]）;嵌套异常是com.fasterxml.jackson.databind.JsonMappingException：没有为类java.io.FileDescriptor找到序列化器，也没有发现创建BeanSerializer的属性（为了避免异常，禁用SerializationFeature.FAIL_ON_EMPTY_BEANS））（通过引用链：org.springframework。 web.multipart.support.StandardMultipartFile [ “的inputStream”] - ＆GT; java.io.FileInputStream中[ “FD”]）

请，任何帮助，不胜感激。我整天都被困在这一天。

Answer 1

我已经使用以下方法签名将params（包括pdf文件作为字节流，即byte[]）作为json发送到请求正文中：

@RequestMapping(value = "/upload", method = RequestMethod.POST)
@ResponseStatus(HttpStatus.CREATED)
public @ResponseBody Long handleFileUpload(@Valid @RequestBody Invoice uploadedInvoice){
  ...
}

如何使用RestTemplate Spring Boot发送Multipart表单数据并上传PDF

1 个答案: