我需要反序列化一个又长又复杂的json,我为此编写了一组java类来映射数据,并且我必须为许多不同类型的字段编写自定义反序列化器(包括String、Boolean、BigDecimal等).
我知道我可以使用相应的自定义反序列化器注释 java 类中的所有字段(如下所示),但随后我需要注释所有类中的几乎所有字段。
@JsonDeserialize(using = CustomBooleanJsonDeserializer.class)
private boolean active;
我还知道我可以在Spring默认中注册一个模块ObjectMapper
(like here),但我只想将这些自定义反序列化器用于这些特定的类。
@Bean
public Module customDeserializersModule() {
SimpleModule module = new SimpleModule();
module.addDeserializer(Boolean.class, new CustomBooleanJsonDeserializer());
// add other custom deserializers
return module;
}
我什至知道我可以使用自定义ObjectMapper
in the RestController
,但我不想放弃通过自动数据绑定的便利@RequestBody
,因为我必须防止其他人在没有必要的自定义反序列化器的情况下使用它。
@RequestMapping(method = RequestMethod.POST, value = "/data")
public ResponseEntity<ServerInfo> register(@RequestBody DataMapper data) {
// DataMapper is the target POJO class of the json's deserialization
}
简而言之,我正在班级层面寻找类似的东西:
@JsonDeserialize(using = CustomStringJsonDeserializer.class, forType = String.class)
@JsonDeserialize(using = CustomBooleanJsonDeserializer.class, forType = Boolean.class)
@JsonDeserialize(using = CustomBigDecimalJsonDeserializer.class, forType = BigDecimal.class)
public class DataMapper implements Serializable {
// obviously, @JsonDeserialize doesn't have a forType method
}
或者也许有某种方式实现自定义解串器为了DataMapper
类,定义如何根据其数据类型反序列化每个字段(无需注释每个字段):
@JsonDeserialize(using = DataMapperJsonDeserializer.class)
public class DataMapper implements Serializable {
// How can I implement the DataMapperJsonDeserializer with these
// characteristics? I know about the ContextualDeserializer interface,
// but I don't know how to use it without annotating each field.
}
或某种方式将模块的效果限制为一个包或一组类:
module.restrictedTo(/*some package or set of classes*/);
// com.fasterxml.jackson.databind.Module doesn't have a restrictedTo method