<dependency>
    <groupId>org.hibernate.validator</groupId>
    <artifactId>hibernate-validator</artifactId>
</dependency>

package com.example.demo.simple.controller;
 
import com.example.demo.simple.entity.User;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.validation.BindingResult;
import org.springframework.validation.ObjectError;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
 
import javax.validation.Valid;
import java.util.List;
 
@Api(tags = "不分組")
@RestController
@RequestMapping("valid")
public class ValidController {
 
    @ApiOperation("正常用法")
    @GetMapping("normal")
    public User normal(@Valid User user) {
        return user;
    }
 
    @ApiOperation("獲得BindingResult")
    @GetMapping("bindingResult")
    public User bindingResult(@Valid User user, BindingResult bindingResult) {
        if (bindingResult.hasErrors()){
            List<ObjectError> list = bindingResult.getAllErrors();
            for (ObjectError objectError : list) {
                System.out.println(objectError.getDefaultMessage());
            }
            //System.out.println(bindingResult.getFieldError().getDefaultMessage());
        }
 
        return user;
    }
 
}

package com.example.demo.simple.entity;
 
import lombok.Data;
 
import javax.validation.Valid;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotEmpty;
import javax.validation.constraints.NotNull;
import java.util.List;
 
@Data
public class User {
    @NotBlank(message = "名字不能為空")
    private String name;
 
    private Integer age;
 
    @NotBlank(message = "密碼不能為空")
    private String password;
 
    @NotEmpty(message = "分?jǐn)?shù)不能為空")
    private List<Integer> scoreArray;
 
    @Valid
    @NotNull(message = "賬戶不能為null")
    private Account account;
}

package com.example.demo.simple.entity;
 
import lombok.Data;
 
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotEmpty;
import java.io.Serializable;
 
@Data
public class Account {
    @NotBlank(message = "電話號(hào)碼不能為空")
    private String phoneNumber;
 
    private String[] emails;
}