定义的实体类：

@Entity
@Table(name = "user")
@Data
public class User{

    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Id
    @Column(name = "id")
    private int id;

    @ApiModelProperty(value = "姓名")
    @Column(name = "name")
    private String name;
    
    @ApiModelProperty(value = "性别")
    @Column(name = "sex")
    private String sex;
}

 前端传递过来的json数据格式

[
  {
    "name": "张三",
    "sex": "男"
  },
  {
    "name": "李四",
    "sex": "男"
  }
]

  后端接口：

/**
 * 保存接口
 */
@PostMapping(value = "/save",consumes = MediaType.APPLICATION_JSON_VALUE)
public void save(@RequestBody List<User> userList){
    userService.save(userList);
}