spring - 从 Spring 的 rest Controller 同时支持 application/json 和 application/x-www-form-urlencoded

Question

我正在编写一个 REST 端点，它需要同时支持 application/x-www-form-urlencoded 和 application/json 作为请求主体。我做了以下配置，

@RequestMapping(method = RequestMethod.POST, produces = { MediaType.APPLICATION_JSON_VALUE }, consumes = {          
        MediaType.APPLICATION_FORM_URLENCODED_VALUE, MediaType.APPLICATION_JSON_VALUE }, path = Constants.ACCESS_TOKEN_V1_ENDPOINT)
public OAuth2Authorization createAccessTokenPost(
        @RequestBody(required = false) MultiValueMap<String, String> paramMap) { ..

虽然它单独支持 application/x-www-form-urlencoded 或 application/json (当我从 consumes = {} 注释掉一种内容类型时)，但它不能同时支持两者。有任何想法吗 ？

Answer 1

所以 RestControllers 默认可以处理 application/json相当容易，并且可以从 @RequestBody 创建请求 pojo带注释的参数，而 application/x-www-form-urlencoded需要更多的工作。一个解决方案可能是创建一个额外的 RestController 方法，该方法具有相同的映射端点来处理传入的不同类型的请求( application/json, application/x-www-form-urlencoded 等)。这是因为 application/x-www-form-urlencoded端点需要使用 @RequestParam而不是 @RequestBody注释(用于 application/json )。
例如，如果我想为 /emp 托管一个 POST 端点。这需要application/json或 application/x-www-form-urlencoded作为 Content-Types 并使用服务来做某事，我可以像这样创建重载方法

@Autowired
private EmpService empService;

    @PostMapping(path = "/emp", consumes = {MediaType.APPLICATION_FORM_URLENCODED_VALUE})
    public ResponseEntity createEmp(final @RequestHeader(value = "Authorization", required = false) String authorizationHeader,
                                final @RequestParam Map<String, String> map) {
        //After receiving a FORM URLENCODED request, change it to your desired request pojo with ObjectMapper
        final ObjectMapper mapper = new ObjectMapper();
        final TokenRequest tokenRequest = mapper.convertValue(map, CreateEmpRequest.class);
        return empService.create(authorizationHeader, createEmpRequest);
    }

    @PostMapping(path = "/emp", consumes = {MediaType.APPLICATION_JSON_VALUE})
    public ResponseEntity createEmp(final @RequestHeader(value = "Authorization", required = false) String authorizationHeader,
                                final @RequestBody CreateEmpRequest createEmpRequest) {
        //Receieved a JSON request, the @RequestBody Annotation can handle turning the body of the request into a request pojo without extra lines of code
        return empService.create(authorizationHeader, createEmpRequest);
    }