com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "FileSize"

 

請求阿里雲的OSS接口圖片信息，返回json格式的數據，通過ObjectMapper將json轉為Image對象時候報錯轉換失敗

將json轉對象的代碼：

String jsonStr = "{\n" +
        "    \"FileSize\": {\"value\": \"25929\"},\n" +
        "    \"Format\": {\"value\": \"jpg\"},\n" +
        "    \"ImageHeight\": {\"value\": \"200\"},\n" +
        "    \"ImageWidth\": {\"value\": \"300\"},\n" +
        "    \"ResolutionUnit\": {\"value\": \"1\"},\n" +
        "    \"XResolution\": {\"value\": \"100/1\"},\n" +
        "    \"YResolution\": {\"value\": \"100/1\"}}";
ObjectMapper objectMapper = new ObjectMapper();
Image image = objectMapper.readValue(jsonStr, Image.class);

　　

報錯信息：

com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "FileSize" (class com.xxx.xxx.bean.Image), not marked as ignorable (7 known properties: "resolutionUnit", "imageHeight", "xresolution", "yresolution", "format", "imageWidth", "fileSize"])
 at [Source: {
    "FileSize": {"value": "25929"},
    "Format": {"value": "jpg"},
    "ImageHeight": {"value": "200"},
    "ImageWidth": {"value": "300"},
    "ResolutionUnit": {"value": "1"},
    "XResolution": {"value": "100/1"},
    "YResolution": {"value": "100/1"}}; line: 2, column: 18] (through reference chain: com.xxx.xxx.bean.Image["FileSize"])
	at com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException.from(UnrecognizedPropertyException.java:62)
	at com.fasterxml.jackson.databind.DeserializationContext.handleUnknownProperty(DeserializationContext.java:834)
	at com.fasterxml.jackson.databind.deser.std.StdDeserializer.handleUnknownProperty(StdDeserializer.java:1093)
	at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownProperty(BeanDeserializerBase.java:1489)
	at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownVanilla(BeanDeserializerBase.java:1467)
	at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:282)
	at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:140)
	at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3814)
	at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2858)
	at com.xxx.xxx.service.PostOssService.main(OssService.java:103)

　　

原因：

　　Image對象中缺少json的某個字段屬性引起

 

解決：

1、加上如下兩行代碼：

objectMapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
objectMapper.setVisibilityChecker(VisibilityChecker.Std.defaultInstance().withFieldVisibility(JsonAutoDetect.Visibility.ANY));

 

2、在需要轉化的對象的類中添加注解，注解信息如下： 

@JsonIgnoreProperties(ignoreUnknown = true)

 

參考：

https://stackoverflow.com/questions/51034173/backblazetokenresponse-com-fasterxml-jackson-databind-exc-unrecognizedproperty

https://blog.csdn.net/qq_30739519/article/details/51273544