spring表单验证

使用@Valid 表单验证

1. 在domain层的数据表 class里面需要验证的数据加上验证条件
2. 在Controller层参数前面添加@Valid注解

   doamin文件

package com.example.luckymoney.domain;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.validation.constraints.Min;
import java.math.BigDecimal;
/**
 * luckymoney 数据表
 */
@Entity
public class Luckymoney {
    @Id
    @GeneratedValue
    private Integer id;
    @Min(value = 10, message = "红包大小不能低于十元")
    private BigDecimal money;
    /**
     * 红包发送方
     */
    private String producer;
    public BigDecimal getMoney() {
        return money;
    }
    public void setMoney(BigDecimal money) {
        this.money = money;
    }
    public String getProducer() {
        return producer;
    }
    public void setProducer(String producer) {
        this.producer = producer;
    }
}

controller使用

package com.example.luckymoney.controller;
import com.example.luckymoney.repository.LuckmoneyRepository;
import com.example.luckymoney.domain.Luckymoney;
import com.example.luckymoney.service.LuckymoneyService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.*;
import javax.validation.Valid;
import java.math.BigDecimal;
import java.util.List;
import java.util.Optional;
@RestController
public class LuckymoneyController {
    @Autowired
    private LuckmoneyRepository repository;
    @Autowired
    private LuckymoneyService service;
    /**
     * 获取红包列表
     */
    @GetMapping("/luckymoneys")
    public List<Luckymoney> list() {
        return repository.findAll();
    }
    /**
     * 添加一个红包
     */
    @PostMapping("/luckymoney")
    public Luckymoney create(@Valid Luckymoney luckymoney, BindingResult bindingResult) {
        // bindingResult返回验证的结果
        if (bindingResult.hasErrors()) {
            System.out.println(bindingResult.getFieldError().getDefaultMessage());
            return null;
        }
        luckymoney.setProducer(luckymoney.getProducer());
        luckymoney.setMoney(luckymoney.getMoney());
        return repository.save(luckymoney);
    }
}