Spring Boot controller - Upload Multipart and JSON to DTO

Spring Boot controller - Upload Multipart and JSON to DTO

In a Spring Boot controller, you can handle a request that uploads both a multipart file and JSON data by using the @RequestParam and @RequestBody annotations to bind the file and JSON data to a DTO (Data Transfer Object). Here's a step-by-step guide on how to achieve this:

  • Create a DTO class to represent the JSON data:
public class MyRequestDTO { private String field1; private String field2; // Getters and setters }
  • Create a controller to handle the upload:
import org.springframework.beans.factory.annotation.Autowired; import org.springframework.http.ResponseEntity; import org.springframework.web.bind.annotation.*; import org.springframework.web.multipart.MultipartFile; @RestController @RequestMapping("/api/upload") public class UploadController { @Autowired private MyService myService; // You'll need to create a service class @PostMapping("/multipart-and-json") public ResponseEntity<String> uploadFileAndJson( @RequestParam("file") MultipartFile file, @RequestParam("json") MyRequestDTO requestDTO) { // Process the uploaded file (e.g., save it to disk) // ... // Process the JSON data from the requestDTO String field1 = requestDTO.getField1(); String field2 = requestDTO.getField2(); // Perform some action with the file and JSON data myService.processFileAndJson(file, field1, field2); return ResponseEntity.ok("File and JSON data uploaded successfully"); } }

In this example:

  • We use the @PostMapping annotation to specify the HTTP POST method for the /api/upload/multipart-and-json endpoint.

  • The @RequestParam annotation is used to bind the file and json parts of the multipart request to the MultipartFile and MyRequestDTO parameters, respectively.

  • You should inject a service class (e.g., MyService) where you can implement the business logic for processing the uploaded file and JSON data.

  • Configure your Spring Boot application to handle multipart requests by adding the following properties to your application.properties or application.yml:

For application.properties:

spring.servlet.multipart.enabled=true spring.servlet.multipart.max-file-size=10MB spring.servlet.multipart.max-request-size=10MB

For application.yml:

spring: servlet: multipart: enabled: true max-file-size: 10MB max-request-size: 10MB

These properties enable multipart file handling and set the maximum file size and request size as needed.

  • Implement your service class (MyService in this example) to handle the file and JSON data processing logic:
import org.springframework.stereotype.Service; import org.springframework.web.multipart.MultipartFile; @Service public class MyService { public void processFileAndJson(MultipartFile file, String field1, String field2) { // Implement your business logic here // You can access the file and JSON data and perform required operations } }

With this setup, your Spring Boot controller can handle HTTP POST requests containing both a multipart file and JSON data. The uploaded file and JSON data are bound to the appropriate DTO and can be processed in your service layer as needed.

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load-testing joblib angular2-template dojo-1.8 dbf react-native-bridge resteasy android-studio-3.1 raw-input styles

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