我使用JAVA 1.6和Jackson 1.9.9,我有一个enum

public enum Event {
    FORGOT_PASSWORD("forgot password");

    private final String value;

    private Event(final String description) {
        this.value = description;
    }

    @JsonValue
    final String value() {
        return this.value;
    }
}

我已经添加了一个@JsonValue,这似乎做的工作,它序列化对象:

{"event":"forgot password"}

但当我尝试反序列化时,我得到

Caused by: org.codehaus.jackson.map.JsonMappingException: Can not construct instance of com.globalrelay.gas.appsjson.authportal.Event from String value 'forgot password': value not one of declared Enum instance names

我错过了什么?


当前回答

@JsonFormat(shape = JsonFormat.Shape.OBJECT)
public enum LoginOptionType {

 PHONE(1, "Phone"), MAIL(2, "mail"), PERSONAL_EMAIL(3, "Personal email");

private static List<LoginOptionType> all;

static {
    all = new ArrayList<LoginOptionType>() {
        {
            add(LoginOptionType.PHONE);
            add(LoginOptionType.MAIL);
            add(LoginOptionType.PERSONAL_EMAIL);
        }
    };
}

private final Integer viewValue;

private final String name;

LoginOptionType(Integer viewValue, String name) {
    this.viewValue = viewValue;
    this.name = name;
}

public Integer getViewValue() {
    return viewValue;
}

public String getName() {
    return name;
}

public static List<LoginOptionType> getAll() {
    return all;
}
}

响应

[
{
    "viewValue": 1,
    "name": "Phone"
},
{
    "viewValue": 2,
    "name": "mail"
},
{
    "viewValue": 3,
    "name": "Personal email"
}
]

其他回答

这篇文章是旧的,但如果它可以帮助别人,使用JsonFormat.Shape.STRING

@JsonFormat(shape = JsonFormat.Shape.STRING)
public enum SomeEnum{
    @JsonProperty("SOME_PROPERTY")
    someProperty,
    ...
}

代码结果如下所示

{"someenum":"SOME_PROPERTY"}

可以采用多种方法将JSON对象反序列化为枚举。我最喜欢的风格是创建一个内部类:

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.annotation.JsonProperty;
import org.hibernate.validator.constraints.NotEmpty;

import java.util.Arrays;
import java.util.Map;
import java.util.function.Function;
import java.util.stream.Collectors;

import static com.fasterxml.jackson.annotation.JsonFormat.Shape.OBJECT;

@JsonFormat(shape = OBJECT)
public enum FinancialAccountSubAccountType {
  MAIN("Main"),
  MAIN_DISCOUNT("Main Discount");

  private final static Map<String, FinancialAccountSubAccountType> ENUM_NAME_MAP;
  static {
    ENUM_NAME_MAP = Arrays.stream(FinancialAccountSubAccountType.values())
      .collect(Collectors.toMap(
        Enum::name,
        Function.identity()));
  }

  private final String displayName;

  FinancialAccountSubAccountType(String displayName) {
    this.displayName = displayName;
  }

  @JsonCreator
  public static FinancialAccountSubAccountType fromJson(Request request) {
    return ENUM_NAME_MAP.get(request.getCode());
  }

  @JsonProperty("name")
  public String getDisplayName() {
    return displayName;
  }

  private static class Request {
    @NotEmpty(message = "Financial account sub-account type code is required")
    private final String code;
    private final String displayName;

    @JsonCreator
    private Request(@JsonProperty("code") String code,
                    @JsonProperty("name") String displayName) {
      this.code = code;
      this.displayName = displayName;
    }

    public String getCode() {
      return code;
    }

    @JsonProperty("name")
    public String getDisplayName() {
      return displayName;
    }
  }
}
@JsonFormat(shape = JsonFormat.Shape.OBJECT)
public enum LoginOptionType {

 PHONE(1, "Phone"), MAIL(2, "mail"), PERSONAL_EMAIL(3, "Personal email");

private static List<LoginOptionType> all;

static {
    all = new ArrayList<LoginOptionType>() {
        {
            add(LoginOptionType.PHONE);
            add(LoginOptionType.MAIL);
            add(LoginOptionType.PERSONAL_EMAIL);
        }
    };
}

private final Integer viewValue;

private final String name;

LoginOptionType(Integer viewValue, String name) {
    this.viewValue = viewValue;
    this.name = name;
}

public Integer getViewValue() {
    return viewValue;
}

public String getName() {
    return name;
}

public static List<LoginOptionType> getAll() {
    return all;
}
}

响应

[
{
    "viewValue": 1,
    "name": "Phone"
},
{
    "viewValue": 2,
    "name": "mail"
},
{
    "viewValue": 3,
    "name": "Personal email"
}
]

我发现了一个非常好的和简洁的解决方案,特别是当您不能修改枚举类时,就像在我的例子中一样。然后,您应该提供一个启用了特定特性的自定义ObjectMapper。这些特性从Jackson 1.6开始就可以使用了。所以你只需要在你的enum中写入toString()方法。

public class CustomObjectMapper extends ObjectMapper {
    @PostConstruct
    public void customConfiguration() {
        // Uses Enum.toString() for serialization of an Enum
        this.enable(WRITE_ENUMS_USING_TO_STRING);
        // Uses Enum.toString() for deserialization of an Enum
        this.enable(READ_ENUMS_USING_TO_STRING);
    }
}

还有更多与枚举相关的特性可用,请参见这里:

https://github.com/FasterXML/jackson-databind/wiki/Serialization-Features https://github.com/FasterXML/jackson-databind/wiki/Deserialization-Features

您可以自定义任何属性的反序列化。

使用将要处理的属性的annotationJsonDeserialize (import com.fasterxml.jackson.databin .annotation. jsondeserialize)声明反序列化类。如果这是一个Enum:

@JsonDeserialize(using = MyEnumDeserialize.class)
private MyEnum myEnum;

通过这种方式,您的类将被用于反序列化属性。这是一个完整的例子:

public class MyEnumDeserialize extends JsonDeserializer<MyEnum> {

    @Override
    public MyEnum deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
        JsonNode node = jsonParser.getCodec().readTree(jsonParser);
        MyEnum type = null;
        try{
            if(node.get("attr") != null){
                type = MyEnum.get(Long.parseLong(node.get("attr").asText()));
                if (type != null) {
                    return type;
                }
            }
        }catch(Exception e){
            type = null;
        }
        return type;
    }
}