代码复现

实体类

@Entity
@Table(name = "a",schema = "a")
@JsonIgnoreProperties(value = {"a"})
@Setter
@Generated
public class C {
    @Id
    @GeneratedValue
    private Integer id;
    @Column(name = "diseaseName",length = 255,nullable = false,unique = true)
    private String diseaseName;
    @Column(name = "description",length = 255,nullable = false,unique = true)
    private String description;
    @Column(name = "department",length = 255,nullable = false,unique = true)
    private String department;
}

controller

@ResponseBody
    @RequestMapping(value = "",method = RequestMethod.POST)
    public Response APIcreate(@RequestBody C c) {
        String json = JSONUtil.toJSONString(c);
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON_UTF8);
        HttpEntity<String> entity = new HttpEntity<>(json, headers);
        String url = "http://localhost:3001/c";
        ResponseEntity<Commondisease> responseEntity = restTemplate.postForEntity(url, entity, C.class);
        return new ResponseData(ExceptionMsg.SUCCESS, responseEntity);
    }

返回结果截图：

返回结果为空的讨论：返回的C类是jpa封装后的类，即使通过json工具，也无法转换成功

解决办法一：实体类转成普通类

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class C {

    private Integer id;

    private String diseaseName;

    private String description;

    private String department;

}

 @ResponseBody
    @RequestMapping(value = "",method = RequestMethod.POST)
    public Response APIcreate(@RequestBody C c) {
        //C c = new Commondisease(1,"zhangsan","11","2222");
        String json = JSONUtil.toJSONString(c);
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON_UTF8);
        HttpEntity<String> entity = new HttpEntity<>(json, headers);
        String url = "http://localhost:3001/c/";
        ResponseEntity<Commondisease> responseEntity =         restTemplate.postForEntity(url,entity,C.class);
        return new ResponseData(ExceptionMsg.SUCCESS,responseEntity);
}

返回成功

解决办法二：添加注解

@Data