请求阿里云的OSS接口图片信息，返回json格式的数据，通过ObjectMapper将json转为Image对象时候报错转换失败
将json转对象的代码：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);
报错信息：
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对象中缺少json的某个字段属性引起
解决：
1、加上如下两行代码：
objectMapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);objectMapper.setVisibilityChecker(VisibilityChecker.Std.defaultInstance().withFieldVisibility(JsonAutoDetect.Visibility.ANY));
2、在需要转化的对象的类中添加注解，注解信息如下：
@JsonIgnoreProperties(ignoreUnknown = true)
参考：
https://stackoverflow.com/questions/51034173/backblazetokenresponse-com-fasterxml-jackson-databind-exc-unrecognizedproperty
https://blog.csdn.net/qq_30739519/article/details/51273544