本文為英文版的機器翻譯版本，如內容有任何歧義或不一致之處，概以英文版為準。

# 處理 JSON 的特定記錄 (JAVA POJO)
<a name="schema-registry-gs-json-java-pojo"></a>

您可以使用純舊 Java 物件 (POJO) 並將該物件作為記錄傳遞。這類似於 AVRO 中的特定記錄的概念。[mbknor-jackson-jsonschema](https://github.com/mbknor/mbknor-jackson-jsonSchema) 可以為傳遞的 POJO 產生 JSON 結構描述。此程式庫也可以在 JSON 結構描述中注入其他資訊。

AWS Glue 結構描述登錄檔程式庫會使用注入的「className」欄位，在結構描述中提供完全分類的類別名稱。「className」欄位由還原序列化程式用於還原序列化為該類別的物件。

```
 Example class :

@JsonSchemaDescription("This is a car")
@JsonSchemaTitle("Simple Car Schema")
@Builder
@AllArgsConstructor
@EqualsAndHashCode
// Fully qualified class name to be added to an additionally injected property
// called className for deserializer to determine which class to deserialize
// the bytes into
@JsonSchemaInject(
        strings = {@JsonSchemaString(path = "className",
                value = "com.amazonaws.services.schemaregistry.integrationtests.generators.Car")}
)
// List of annotations to help infer JSON Schema are defined by https://github.com/mbknor/mbknor-jackson-jsonSchema
public class Car {
    @JsonProperty(required = true)
    private String make;

    @JsonProperty(required = true)
    private String model;

    @JsonSchemaDefault("true")
    @JsonProperty
    public boolean used;

    @JsonSchemaInject(ints = {@JsonSchemaInt(path = "multipleOf", value = 1000)})
    @Max(200000)
    @JsonProperty
    private int miles;

    @Min(2000)
    @JsonProperty
    private int year;

    @JsonProperty
    private Date purchaseDate;

    @JsonProperty
    @JsonFormat(shape = JsonFormat.Shape.NUMBER)
    private Date listedDate;

    @JsonProperty
    private String[] owners;

    @JsonProperty
    private Collection<Float> serviceChecks;

    // Empty constructor is required by Jackson to deserialize bytes
    // into an Object of this class
    public Car() {}
}
```