1.后端将枚举类直接返回给前端时只会显示枚举名称

后端经常会使用到枚举类，想让前端知晓这个枚举类中常量的含义，要将其返回给前端。
直接返回枚举类的话，前端只会显示枚举名称，不是很友好。

2.使用 @JsonFormat 注解可以将枚举类转为json再返回给前端。

2.1添加maven依赖

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

2.2在枚举类上添加@JsonFormat(shape = JsonFormat.Shape.OBJECT)

import com.fasterxml.jackson.annotation.JsonFormat;
import lombok.Getter;
@Getter
@JsonFormat(shape = JsonFormat.Shape.OBJECT)
public enum PhaseEnum {//0:接地端,1:导线端A相, 2: 导线端B相,3: 导线端C相,4: 接地端A相,5: 接地端B相,6: 接地端C相PHASE_0(0, "接地端"),PHASE_1(1, "导线端A相"),PHASE_2(2, "导线端B相"),PHASE_3(3, "导线端C相"),PHASE_4(4, "接地端A相"),PHASE_5(5, "接地端B相"),PHASE_6(6, "接地端C相");private final Integer code;private final String name;PhaseEnum(Integer code, String name) {this.code = code;this.name = name;}/***根据name查code**/public static Integer getCodeByName(String name) {for (PhaseEnum phaseEnum : PhaseEnum.values()) {if (phaseEnum.getName().equals(name)) {return phaseEnum.getCode();}}return null;}/***根据name查枚举类**/public static PhaseEnum getPhaseEnum(String name) {for (PhaseEnum temp : PhaseEnum.values()) {if (temp.getName().equals(name))  {return temp;}}return null;}
}

2.3编写接口返回给前端

/*** 获取地线部件的相位枚举**/
@RequestMapping(value = "/getEarthwirePhase.do", method = {RequestMethod.GET})
@ResponseBody
@ApiOperation(value = "获取地线部件的相位枚举", notes = "获取地线部件的相位枚举")
public Object getEarthwirePhase() {return RestResponse.success(PhaseEnum.values());
}