在Java中将Enum序列化为JSON

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.13.0</version>
</dependency>

import com.fasterxml.jackson.annotation.JsonProperty;

public enum Color {
    @JsonProperty("RED")
    RED,
    @JsonProperty("GREEN")
    GREEN,
    @JsonProperty("BLUE")
    BLUE
}

public class Example {
    private Color color;

    public Example(Color color) {
        this.color = color;
    }

    // getter and setter
}

import com.fasterxml.jackson.databind.ObjectMapper;

public class Main {
    public static void main(String[] args) throws Exception {
        ObjectMapper mapper = new ObjectMapper();
        Example example = new Example(Color.RED);
        String json = mapper.writeValueAsString(example);
        System.out.println(json);
    }
}

{"color":"RED"}

<dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
    <version>2.8.8</version>
</dependency>

public enum Color {
    RED,
    GREEN,
    BLUE
}

public class Example {
    private Color color;

    public Example(Color color) {
        this.color = color;
    }

    // getter and setter
}

import com.google.gson.Gson;

public class Main {
    public static void main(String[] args) throws Exception {
        Gson gson = new Gson();
        Example example = new Example(Color.RED);
        String json = gson.toJson(example);
        System.out.println(json);
    }
}

{"color":"RED"}