使用注解@Validated和BindingResult对入参进行非空校验方式

@NotEmpty(groups = {SchoolDTO.SchoolGroup.class},message = "学校名不能为空")

public class SchoolDTO implements Serializable { 
    private Long id;
    @NotEmpty(groups = {SchoolDTO.SchoolGroup.class},message = "学校名不能为空")
    private String schoolName;
 
    @NotNull
    @NotEmpty(groups = {SchoolDTO.SchoolGroup.class},message = "学校负责人不能为空")
    private String schoolPrincipal;
 
    @NotNull
    @NotEmpty(groups = {SchoolDTO.SchoolGroup.class},message = "职务不能为空")
    private String principalPosition;
 
    @NotNull
    @NotEmpty(groups = {SchoolDTO.SchoolGroup.class},message = "联系电话不能为空")
    private String schoolPhone; 
    //getter setter tostring 省略
    public interface SchoolGroup{}  别忘了加这个
}

  @PostMapping("/schools")
    @PreAuthorize("hasRole(\"" + AuthoritiesConstants.ADMIN + "\")")
    public Map<String,Object> createSchool(@RequestBody @Validated({SchoolDTO.SchoolGroup.class}) SchoolDTO schoolDTO,BindingResult bindingResult) throws Exception {
      //返回校验错误信息
        Map<String,Object>map=new HashMap<>();
        if(bindingResult.hasErrors()){
            map.put("success","false");
            map.put("message",bindingResult.getAllErrors());
            return map;
        }
        // .........业务省略 
            return map;
        }
    }