Spring RestController POST 400 Bad Request

Question

我有一个Spring RestController,尽管在Chrome开发者工具中发现了正确的数据,但任何尝试发布到它都会返回400 Bad Request.@Valid注释正在将其踢出,因为根本没有填充ParameterDTO对象.

我的控制器

@RestController
@RequestMapping(path = "/api/parameters", consumes = {MediaType.APPLICATION_JSON_VALUE}, produces = {MediaType.APPLICATION_JSON_VALUE})
public class ParameterResource {

    private final ParameterService parameterService;

    @Autowired
    public ParameterResource(ParameterService parameterService) {
        this.parameterService = parameterService;
    }

    @GetMapping
    public ResponseEntity<?> getParameters(@RequestParam(value = "subGroupId", required = false) Integer subGroupId) {
        if (subGroupId != null) {
            return ResponseEntity.ok(parameterService.getParameters(subGroupId));
        }
        return ResponseEntity.ok(parameterService.getParameters());
    }

    @PostMapping
    public ResponseEntity<?> createParameter(@Valid ParameterDTO parameterData) {
        int id = parameterService.saveParameter(parameterData);
        URI uri = ServletUriComponentsBuilder.fromCurrentRequest().path("/{id}")
                .buildAndExpand(id).toUri();
        return ResponseEntity.created(uri).build();
    }

    @GetMapping(path = "/levels")
    public ResponseEntity<?> getParameterLevels() {
        return ResponseEntity.ok(ParameterLevels.getParameterLevelMap());
    }

    @GetMapping(path = "/levels/{id}/values")
    public ResponseEntity<?> getLevelValues(@PathVariable("id") int levelId) {
        return ResponseEntity.ok(parameterService.getParameterLevelValues(levelId));
    }

    @GetMapping(path = "/types")
    public ResponseEntity<?> getParameterTypes() {
        return ResponseEntity.ok(parameterService.getParameterTypes());
    }
}

我使用的是来自JavaScript的axios,虽然我的问题可能在那里,但我使用Postman也有同样的问题.我正在设置Content-Type和Accept标头.看起来Spring根本没有对数据进行反序列化.

Answer 1

您需要@RequestBody在ParameterDTO parameterData声明之前添加注释,如下所示:

    @PostMapping
    public ResponseEntity<?> createParameter(@RequestBody @Valid ParameterDTO parameterData) {
        int id = parameterService.saveParameter(parameterData);
        URI uri = ServletUriComponentsBuilder.fromCurrentRequest().path("/{id}")
                .buildAndExpand(id).toUri();
        return ResponseEntity.created(uri).build();
    }