mybatis-plus enum实现枚举类型自动转换

/**
 * 实体类
 */
@Data
@TableName("demo")
public class Demo extends Model<Demo> {
    @TableField("status")
    private DemoStatusEnum status;    
}

/**
 * 支持枚举值的两种方式
 * 1、实现 IEnum of T
 * 2、注解 @EnumValue，不用实现 IEnum of T
 */
@Getter
public enum DemoStatusEnum implements IEnum<Integer> {
    DEFAULT(0, "default"),
    NORMAL(1, "normal"),
    LOCKED(2, "locked");

    DemoStatusEnum(Integer value, String desc) {
        this.value = value;
        this.desc = desc;
    }

    private Integer value;
    private String desc;

    @Override
    public Integer getValue() {
        return this.value;
    }
}

    @EnumValue
    private Integer value;
    @JsonValue
    private String desc;

mybatis-plus:
  global-config:
    db-config:
      logic-not-delete-value: 0  #逻辑未删除值为数据库主键
      logic-delete-value: id #逻辑删除值是个d
      # logic-delete-value: "now()" #逻辑删除值是个db获取时间的函数
      # logic-not-delete-value: "null"  #逻辑未删除值为字符串 "null"
      # logic-not-delete-value: "1753-01-01 00:00:00"
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
    # 如果是放在src/main/java目录下 classpath:/com/*/*/mapper/*Mapper.xml
    # 如果是放在resource目录 classpath:/mapper/**.xml
    default-enum-type-handler: org.apache.ibatis.type.EnumOrdinalTypeHandler
    # 如果是放在src/main/java目录下 classpath:/com/*/*/mapper/*Mapper.xml
    # 如果是放在resource目录 classpath:/mapper/**.xml
    # 支持统配符 * 或者 ; 分割
    typeEnumsPackage: com.fii.gxback.eam.domain.enums

/**
 * 判断是否为MP枚举处理
 *
 * @param clazz class
 * @return 是否为MP枚举处理
 * @since 3.3.1
 */
public static boolean isMpEnums(Class<?> clazz) {
    return clazz != null && clazz.isEnum() && (IEnum.class.isAssignableFrom(clazz) || findEnumValueFieldName(clazz).isPresent());
}

/**
     * 查找标记标记EnumValue字段
     *
     * @param clazz class
     * @return EnumValue字段
     * @since 3.3.1
     */
public static Optional<String> findEnumValueFieldName(Class<?> clazz) {
    if (clazz != null && clazz.isEnum()) {
        String className = clazz.getName();
        return Optional.ofNullable(CollectionUtils.computeIfAbsent(TABLE_METHOD_OF_ENUM_TYPES, className, key -> {
            Optional<Field> optional = Arrays.stream(clazz.getDeclaredFields())
                // 过滤包含注解@EnumValue的字段
                .filter(field -> field.isAnnotationPresent(EnumValue.class))
                .findFirst();
            return optional.map(Field::getName).orElse(null);
        }));
    }
    return Optional.empty();
}

// 取得类型转换注册器
TypeHandlerRegistry typeHandlerRegistry = targetConfiguration.getTypeHandlerRegistry();
classes.stream()
    .filter(Class::isEnum)
    .filter(MybatisEnumTypeHandler::isMpEnums)
    .forEach(cls -> typeHandlerRegistry.register(cls, MybatisEnumTypeHandler.class));

@RequestMapping("/{id}")
public Demo get(@PathVariable("id") Long id) {
    return demoService.getById(id);
}

package org.apache.ibatis.type;

import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class EnumOrdinalTypeHandler<E extends Enum<E>> extends BaseTypeHandler<E> {
    private final Class<E> type;
    private final E[] enums;

    public EnumOrdinalTypeHandler(Class<E> type) {
        if (type == null) {
            throw new IllegalArgumentException("Type argument cannot be null");
        } else {
            this.type = type;
            this.enums = (Enum[])type.getEnumConstants();
            if (this.enums == null) {
                throw new IllegalArgumentException(type.getSimpleName() + " does not represent an enum type.");
            }
        }
    }

    public void setNonNullParameter(PreparedStatement ps, int i, E parameter, JdbcType jdbcType) throws SQLException {
        ps.setInt(i, parameter.ordinal());
    }

    public E getNullableResult(ResultSet rs, String columnName) throws SQLException {
        int ordinal = rs.getInt(columnName);
        return ordinal == 0 && rs.wasNull() ? null : this.toOrdinalEnum(ordinal);
    }

    public E getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
        int ordinal = rs.getInt(columnIndex);
        return ordinal == 0 && rs.wasNull() ? null : this.toOrdinalEnum(ordinal);
    }

    public E getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
        int ordinal = cs.getInt(columnIndex);
        return ordinal == 0 && cs.wasNull() ? null : this.toOrdinalEnum(ordinal);
    }

    private E toOrdinalEnum(int ordinal) {
        try {
            return this.enums[ordinal];
        } catch (Exception var3) {
            throw new IllegalArgumentException("Cannot convert " + ordinal + " to " + this.type.getSimpleName() + " by ordinal value.", var3);
        }
    }
}