接收体的Spring类型

Question

根据这个答案，我在控制器中设置了以下方法：

@PostMapping(path = PathConstants.START_ACTION, consumes = {MediaType.APPLICATION_FORM_URLENCODED_VALUE, MediaType.APPLICATION_JSON_VALUE})
    public ResponseEntity<BaseResponse<ProcessInstance>> start(@PathVariable String processDefinitionId,
            @RequestBody(required = false) String params)

现在，我需要根据我的@RequestBody是一种媒体类型还是另一种媒体类型而做出不同的行为，因此我需要知道我的paramsbody是否是json或URLCoded。有办法做到这一点吗？

Answer 1

您可以简单地注入Content-Type标头。

    @PostMapping(path = "/{processDefinitionId}", consumes = {MediaType.APPLICATION_FORM_URLENCODED_VALUE, MediaType.APPLICATION_JSON_VALUE})
    public ResponseEntity<String> start(@PathVariable String processDefinitionId,
                                        @RequestBody(required = false) String params,
                                        @RequestHeader("Content-Type") String contentType) {
        if (contentType.startsWith(MediaType.APPLICATION_JSON_VALUE)) {
            System.out.println("json");
        } else {
            // ...
        }
        return ResponseEntity.ok(params);
    }

但我建议将此方法分为两种不同消费价值的方法：

    @PostMapping(path = "/v2/{processDefinitionId}", consumes = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<String> startV2Json(@PathVariable String processDefinitionId,
                                        @RequestBody(required = false) String params) {
        return ResponseEntity.ok(params);
    }

    @PostMapping(path = "/v2/{processDefinitionId}", consumes = MediaType.APPLICATION_FORM_URLENCODED_VALUE)
    public ResponseEntity<String> startV2UrlEncoded(@PathVariable String processDefinitionId,
                                        @RequestBody(required = false) String params) {
        return ResponseEntity.ok(params);
    }