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拦截所有年龄<18岁的用户

1、实体层定义限制

package cn.edu.shu.ces_chenjie.pojo;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;import javax.validation.constraints.Min;@Entitypublic class Person {    @Id    @GeneratedValue    private Integer id;    @Min(value = 18,message = "未满18岁禁止访问")    private Integer age;    private String name;    public Person() {    }    public Integer getId() {        return id;    }    public void setId(Integer id) {        this.id = id;    }    public Integer getAge() {        return age;    }    public void setAge(Integer age) {        this.age = age;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    @Override    public String toString() {        return "Person{" +                "id=" + id +                ", age=" + age +                ", name='" + name + '\'' +                '}';    }}

2、Controller层使用Valid进行参数验证，

package cn.edu.shu.ces_chenjie.controller;import cn.edu.shu.ces_chenjie.pojo.Person;import cn.edu.shu.ces_chenjie.repository.PersonRepository;import cn.edu.shu.ces_chenjie.service.PersonService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.validation.BindingResult;import org.springframework.web.bind.annotation.*;import javax.validation.Valid;import java.util.List;@RestControllerpublic class PersonController {    @Autowired    private PersonRepository repository;    @Autowired    private PersonService personService;    @GetMapping("/persons")    public List
   
     personList(){        return repository.findAll();    }    //使用@Valid进行验证，验证结果放在BindingResult里面    @PostMapping("/persons")    public String personAdd(@Valid Person person,BindingResult bindingResult){        if(bindingResult.hasErrors()){            System.out.println(bindingResult.getFieldError().getDefaultMessage());            return bindingResult.getFieldError().getDefaultMessage();        }        person.setAge(person.getAge());        person.setName(person.getName());        return repository.save(person).toString();    }    @GetMapping("persons/{name}")    public List
    
      personListByName(@PathVariable("name")String name){        return repository.findByName(name);    }    @PostMapping("persons/two")    public void personTwo(){        personService.insertTwo();    }}