java - jackson 枚举属性(property)没有得到认可

Question

我有一个像这样的枚举:

public enum Type {
   @JsonProperty("private")Private, group, supergroup, channel    
}

json 文件本身有私有(private)字段，所以我需要私有(private)(这是 java 键盘)来进行序列化和映射，但是如果我使用 private 并且所有小写都是运行时错误。我在上面的代码中使用了 @JsonProperty，但仍然无法正常工作。

你有什么解决办法吗？

这里是个异常(exception):

com.fasterxml.jackson.databind.exc.InvalidFormatException: Can not construct instance of com.mehdi.model.Chat$Type from String value 'private': value not one of declared Enum instance names: [Private, group, supergroup, channel] at [Source: /home/mehdi/Desktop/json.txt; line: 14, column: 16] (through reference chain: com.mehdi.model.Update["message"]->com.mehdi.model.Message["chat"]->com.mehdi.model.Chat["type"]) at com.fasterxml.jackson.databind.exc.InvalidFormatException.from(InvalidFormatException.java:55) at com.fasterxml.jackson.databind.DeserializationContext.weirdStringException(DeserializationContext.java:742) at com.fasterxml.jackson.databind.deser.std.EnumDeserializer.deserialize(EnumDeserializer.java:91) at com.fasterxml.jackson.databind.deser.std.EnumDeserializer.deserialize(EnumDeserializer.java:20) at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:525) at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:99) at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:242) at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:118) at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:525) at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:99) at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:242) at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:118) at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:525) at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:99) at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:242) at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:118) at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2993) at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2052) at com.mehdi.ff.Test.main(Test.java:25) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)

Process finished with exit code 0

Answer 1

您必须在枚举实现中使用 @JsonValue。

public enum Type {

    Private("private"),
    Group("group"),
    Supergroup("supergroup"),
    Channel("channel")

    private String jsonValue;

    private Type(final String json) {
        this.jsonValue = json;
    }

    @JsonValue
    public String jsonValue() {
        return this.jsonValue;
    }

}