这是一个比较宽泛的问题，因为它与Java Spring和Python都有关系，但由于以下原因，我不能确切地说出错误在哪里：

1. Postman中的POST请求工作正常，没有错误
   1.使用requests库的Python请求不起作用，并返回错误400
   1.在我的Java Spring应用程序中，在Python上尝试POST之后，我可以在终端中看到以下内容：Resolved [org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Cannot construct instance of [组].状态数据到(although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value [JSON STRING]
   相关文件上的代码片段：
   StatsDto.java 注意：我尝试不使用@JsonProperties注解和后面的注解，但得到了相同的结果。

public class StatsDto {

    @NotBlank
    private String codec;
    @NotBlank
    private String video;
    @NotBlank
    private String resolution;
    @NotNull
    private float fps;
    @NotNull
    private int nFrames;
    @NotNull
    private int qp;
    @NotNull
    private float yPSNR;
    @NotNull
    private float uPSNR;
    @NotNull
    private float vPSNR;
    @NotNull
    private float yuvPSNR;
    @NotNull
    private float bitrate;
    @NotNull
    private float time;

    public StatsDto() {
    }

    @JsonCreator
    public StatsDto(@JsonProperty("codec") String codec, @JsonProperty("video") String video,
                    @JsonProperty("resolution") String resolution, @JsonProperty("fps") int fps,
                    @JsonProperty("nFrames") int nFrames, @JsonProperty("qp") int qp,
                    @JsonProperty("yPSNR") float yPSNR, @JsonProperty("uPSNR") float uPSNR,
                    @JsonProperty("vPSNR") float vPSNR, @JsonProperty("yuvPSNR") float yuvPSNR,
                    @JsonProperty("bitrate") float bitrate, @JsonProperty("time") float time) {
        this.codec = codec;
        this.video = video;
        this.resolution = resolution;
        this.fps = fps;
        this.nFrames = nFrames;
        this.qp = qp;
        this.yPSNR = yPSNR;
        this.uPSNR = uPSNR;
        this.vPSNR = vPSNR;
        this.yuvPSNR = yuvPSNR;
        this.bitrate = bitrate;
        this.time = time;
    }

HttpContent.py

class HttpContent:

    (...)

    def POST(self) -> requests.Response:
        mock_dict = {
            "codec": "SVT-AV1",
            "video": "bowling_cif",
            "resolution": "800x600",
            "fps": 29.97,
            "nFrames": 300,
            "qp": 27,
            "yPSNR": 32.05,
            "uPSNR": 39.78,
            "vPSNR": 31.423,
            "yuvPSNR": 37.32193728,
            "bitrate": 2178327.32,
            "time": 83289382.3289
        }

        response = requests.post(self.base_url, headers={'content-type': 'application/json'}, json=json.dumps(mock_dict))
        return response

app.py

http = HttpContent("[LINK]")

print(http.POST())

我尝试过在Java应用程序中更改注解、创建一个空的构造函数和一个完整的构造函数、检查Python中的语法、使用str（）将dict硬编码为字符串等，但没有任何效果。