SpringBoot接口参数校验

一、JSR303校验

1.使用校验注解

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-validationartifactId>
            <version>2.3.2.RELEASEversion>
        dependency>

        
        <dependency>
            <groupId>javax.validationgroupId>
            <artifactId>validation-apiartifactId>
            <version>2.0.1.Finalversion>
        dependency>

（1）@NotNull
The annotated element must not be null. Accepts any type.
注解元素禁止为null，能够接收任何类型
（2）@NotEmpty
the annotated element must not be null nor empty.
该注解修饰的字段不能为null或""
Supported types are:
支持以下几种类型
CharSequence (length of character sequence is evaluated)
字符序列（字符序列长度的计算）
Collection (collection size is evaluated)
集合长度的计算
Map (map size is evaluated)
map长度的计算
Array (array length is evaluated)
数组长度的计算

（3）@NotBlank

The annotated element must not be null and must contain at least one non-whitespace character. Accepts CharSequence.
该注解不能为null，并且至少包含一个非空白字符。接收字符序列。

package com.atguigu.gulimall.product.entity;

import com.atguigu.common.valid.AddGroup;
import com.atguigu.common.valid.ListValue;
import com.atguigu.common.valid.UpdateGroup;
import com.atguigu.common.valid.UpdateStatusGroup;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;
import org.hibernate.validator.constraints.URL;

import javax.validation.constraints.*;
import java.io.Serializable;

/**
 * 品牌
 * 
 * @author steven
 * @email [email protected]
 * @date 2022-01-08 16:31:09
 */
@Data
@TableName("pms_brand")
public class BrandEntity implements Serializable {
	private static final long serialVersionUID = 1L;

	/**
	 * 品牌id
	 */
	@Null(message = "新增品牌ID必须为空",groups = {AddGroup.class})
	@NotNull(message = "修改是品牌ID不能为空",groups = {UpdateGroup.class})
	@TableId
	private Long brandId;
	/**
	 * 品牌名
	 */
	@NotBlank(message = "品牌名不能为空",groups = {AddGroup.class,UpdateGroup.class})
	private String name;
	/**
	 * 品牌logo地址
	 */
	@NotEmpty(message = "商品logo地址不能为空",groups = {AddGroup.class})
	//,groups = {AddGroup.class, UpdateGroup.class}
	@URL(message = "logo必须是一个合法的url地址",groups = {AddGroup.class,UpdateGroup.class})
	private String logo;
	/**
	 * 介绍
	 */
	private String descript;
	/**
	 * 显示状态[0-不显示；1-显示]
	 */
	@NotNull(message = "状态不能为空",groups = {AddGroup.class,UpdateStatusGroup.class})
	@ListValue(vals = {0,1},groups = {AddGroup.class, UpdateStatusGroup.class})
	private Integer showStatus;
	/**
	 * 检索首字母
	 */
	@NotBlank(message = "检索首字母不能为空",groups = {AddGroup.class})
	@Pattern(regexp = "^[a-zA-Z]$",message = "检索首字母必须是一个字母",groups = {AddGroup.class,UpdateGroup.class})
	private String firstLetter;
	/**
	 * 排序
	 */
	@NotNull(message = "排序字段不能为空",groups = {AddGroup.class})
	@Min(value = 0,message = "排序必须大于等于0",groups = {AddGroup.class,UpdateGroup.class})
	private Integer sort;
}

2：在请求方法种，使用校验注解@Validated，开启校验

/**
     * 修改
     */
    @RequestMapping("/update")

    public R update(@Validated @RequestBody BrandEntity brand){
		brandService.updateById(brand);

        return R.ok();
    }

这些错误消息定义在“hibernate-validator”的“\org\hibernate\validator\ValidationMessages_zh_CN.properties”文件中。在该文件中定义了很多的错误规则：

javax.validation.constraints.AssertFalse.message     = 只能为false
javax.validation.constraints.AssertTrue.message      = 只能为true
javax.validation.constraints.DecimalMax.message      = 必须小于或等于{value}
javax.validation.constraints.DecimalMin.message      = 必须大于或等于{value}
javax.validation.constraints.Digits.message          = 数字的值超出了允许范围(只允许在{integer}位整数和{fraction}位小数范围内)
javax.validation.constraints.Email.message           = 不是一个合法的电子邮件地址
javax.validation.constraints.Future.message          = 需要是一个将来的时间
javax.validation.constraints.FutureOrPresent.message = 需要是一个将来或现在的时间
javax.validation.constraints.Max.message             = 最大不能超过{value}
javax.validation.constraints.Min.message             = 最小不能小于{value}
javax.validation.constraints.Negative.message        = 必须是负数
javax.validation.constraints.NegativeOrZero.message  = 必须是负数或零
javax.validation.constraints.NotBlank.message        = 不能为空
javax.validation.constraints.NotEmpty.message        = 不能为空
javax.validation.constraints.NotNull.message         = 不能为null
javax.validation.constraints.Null.message            = 必须为null
javax.validation.constraints.Past.message            = 需要是一个过去的时间
javax.validation.constraints.PastOrPresent.message   = 需要是一个过去或现在的时间
javax.validation.constraints.Pattern.message         = 需要匹配正则表达式"{regexp}"
javax.validation.constraints.Positive.message        = 必须是正数
javax.validation.constraints.PositiveOrZero.message  = 必须是正数或零
javax.validation.constraints.Size.message            = 个数必须在{min}和{max}之间

org.hibernate.validator.constraints.CreditCardNumber.message        = 不合法的信用卡号码
org.hibernate.validator.constraints.Currency.message                = 不合法的货币 (必须是{value}其中之一)
org.hibernate.validator.constraints.EAN.message                     = 不合法的{type}条形码
org.hibernate.validator.constraints.Email.message                   = 不是一个合法的电子邮件地址
org.hibernate.validator.constraints.Length.message                  = 长度需要在{min}和{max}之间
org.hibernate.validator.constraints.CodePointLength.message         = 长度需要在{min}和{max}之间
org.hibernate.validator.constraints.LuhnCheck.message               = ${validatedValue}的校验码不合法, Luhn模10校验和不匹配
org.hibernate.validator.constraints.Mod10Check.message              = ${validatedValue}的校验码不合法, 模10校验和不匹配
org.hibernate.validator.constraints.Mod11Check.message              = ${validatedValue}的校验码不合法, 模11校验和不匹配
org.hibernate.validator.constraints.ModCheck.message                = ${validatedValue}的校验码不合法, ${modType}校验和不匹配
org.hibernate.validator.constraints.NotBlank.message                = 不能为空
org.hibernate.validator.constraints.NotEmpty.message                = 不能为空
org.hibernate.validator.constraints.ParametersScriptAssert.message  = 执行脚本表达式"{script}"没有返回期望结果
org.hibernate.validator.constraints.Range.message                   = 需要在{min}和{max}之间
org.hibernate.validator.constraints.SafeHtml.message                = 可能有不安全的HTML内容
org.hibernate.validator.constraints.ScriptAssert.message            = 执行脚本表达式"{script}"没有返回期望结果
org.hibernate.validator.constraints.URL.message                     = 需要是一个合法的URL

org.hibernate.validator.constraints.time.DurationMax.message        = 必须小于${inclusive == true ? '或等于' : ''}${days == 0 ? '' : days += '天'}${hours == 0 ? '' : hours += '小时'}${minutes == 0 ? '' : minutes += '分钟'}${seconds == 0 ? '' : seconds += '秒'}${millis == 0 ? '' : millis += '毫秒'}${nanos == 0 ? '' : nanos += '纳秒'}
org.hibernate.validator.constraints.time.DurationMin.message        = 必须大于${inclusive == true ? '或等于' : ''}${days == 0 ? '' : days += '天'}${hours == 0 ? '' : hours += '小时'}${minutes == 0 ? '' : minutes += '分钟'}${seconds == 0 ? '' : seconds += '秒'}${millis == 0 ? '' : millis += '毫秒'}${nanos == 0 ? '' : nanos += '纳秒'}

3：给校验的Bean后，紧跟一个BindResult，就可以获取到校验的结果。拿到校验的结果，就可以自定义的封装。

 public R save(@Validated @RequestBody BrandEntity brand, BindingResult bindingResult){
        Map<String,String> map = new HashMap<>();
        if(bindingResult.hasErrors()){
            bindingResult.getFieldErrors().stream().forEach(item->{
                String field = item.getField();
                String defaultMessage = item.getDefaultMessage();
                map.put(field, defaultMessage);
            });
            return R.error(400,"参数错误").put("data", map);
        }else{
            brandService.save(brand);
            return R.ok();
        }
    }

4.统一异常处理

可以使用SpringMvc所提供的@ControllerAdvice，通过“basePackages”能够说明处理哪些路径下的异常。

package com.bigdata.gulimall.product.exception;

import com.bigdata.common.utils.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestControllerAdvice;

import java.util.HashMap;
import java.util.Map;

/**
 * 集中处理所有异常
 */
@Slf4j
@RestControllerAdvice(basePackages = "com.bigdata.gulimall.product.controller")
public class GulimallExceptionAdvice {


    @ExceptionHandler(value = Exception.class)
    public R handleValidException(MethodArgumentNotValidException exception){
        Map<String,String> map=new HashMap<>();
        BindingResult bindingResult = exception.getBindingResult();
        bindingResult.getFieldErrors().forEach(fieldError -> {
            String message = fieldError.getDefaultMessage();
            String field = fieldError.getField();
            map.put(field,message);
        });

        log.error("数据校验出现问题{},异常类型{}",exception.getMessage(),exception.getClass());
        return R.error(400,"数据校验出现问题").put("data",map);
    }
}

二、 分组校验功能（完成多场景的复杂校验）

1、给校验注解，标注上groups，指定什么情况下才需要进行校验

如：指定在更新和添加的时候，都需要进行校验

@NotEmpty
   @NotBlank(message = "品牌名必须非空",groups = {UpdateGroup.class,AddGroup.class})
   private String name;

在这种情况下，没有指定分组的校验注解，默认是不起作用的。想要起作用就必须要加groups。

2、业务方法参数上使用@Validated注解

@Validated的value方法：
Specify one or more validation groups to apply to the validation step kicked off by this annotation.
指定一个或多个验证组以应用于此注释启动的验证步骤。
JSR-303 defines validation groups as custom annotations which an application declares for the sole purpose of using
them as type-safe group arguments, as implemented in SpringValidatorAdapter.
JSR-303 将验证组定义为自定义注释，应用程序声明的唯一目的是将它们用作类型安全组参数，如 SpringValidatorAdapter 中实现的那样。
Other SmartValidator implementations may support class arguments in other ways as well.
其他SmartValidator 实现也可以以其他方式支持类参数。

默认情况下，在分组校验情况下，没有指定指定分组的校验注解，将不会生效，它只会在不分组的情况下生效。

三、自定义校验功能

1.编写一个自定义的校验注解

@Documented
@Constraint(validatedBy = { ListValueConstraintValidator.class})
@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE })
@Retention(RUNTIME)
public @interface ListValue {
    String message() default "{com.bigdata.common.valid.ListValue.message}";

    Class<?>[] groups() default { };

    Class<? extends Payload>[] payload() default { };

    int[] value() default {};
}

2.编写一个自定义的校验器

public class ListValueConstraintValidator implements ConstraintValidator<ListValue,Integer> {
    private Set<Integer> set=new HashSet<>();
    @Override
    public void initialize(ListValue constraintAnnotation) {
        int[] value = constraintAnnotation.value();
        for (int i : value) {
            set.add(i);
        }
    }
    @Override
    public boolean isValid(Integer value, ConstraintValidatorContext context) {
        return  set.contains(value);
    }
}

指向自定义校验类 @Constraint(validatedBy = { ListValueConstraintValidator.class})

编写自定义提示文件放到resource目录下 ValidationMessages.properties

com.atguigu.common.valid.ListValue.message=必须提交指定的值

3.校验list

package cn.sh.ideal.utils;
 
import javax.validation.Valid;

import java.util.*;

import lombok.Data;
import lombok.NoArgsConstructor;
 
/**
 * @ClassName ValidList
 * @Description ValidList
 * @Author Steven
 * @Date 2020/8/26 16:05
 * @Version 1.0
 **/
@Data
@NoArgsConstructor
public class ValidList<E> implements List<E> {
 
    @Valid
    private List<E> list = new LinkedList<>();
 
    public ValidList(List<E> paramList) {
        this.list = paramList;
    }
 
    @Override
    public int size() {
        return list.size();
    }
 
    @Override
    public boolean isEmpty() {
        return list.isEmpty();
    }
 
    @Override
    public boolean contains(Object o) {
        return list.contains(0);
    }
 
    @Override
    public Iterator<E> iterator() {
        return list.iterator();
    }
 
    @Override
    public Object[] toArray() {
        return list.toArray();
    }
 
    @Override
    public <T> T[] toArray(T[] a) {
        return list.toArray(a);
    }
 
    @Override
    public boolean add(E e) {
        return list.add(e);
    }
 
    @Override
    public boolean remove(Object o) {
        return list.remove(o);
    }
 
    @Override
    public boolean containsAll(Collection<?> c) {
        return list.containsAll(c);
    }
 
    @Override
    public boolean addAll(Collection<? extends E> c) {
        return list.addAll(c);
    }
 
    @Override
    public boolean addAll(int index, Collection<? extends E> c) {
        return list.addAll(index, c);
    }
 
    @Override
    public boolean removeAll(Collection<?> c) {
        return list.removeAll(c);
    }
 
    @Override
    public boolean retainAll(Collection<?> c) {
        return list.retainAll(c);
    }
 
    @Override
    public void clear() {
        list.clear();
    }
 
    @Override
    public E get(int index) {
        return list.get(index);
    }
 
    @Override
    public E set(int index, E element) {
        return list.set(index, element);
    }
 
    @Override
    public void add(int index, E element) {
        list.add(index, element);
    }
 
    @Override
    public E remove(int index) {
        return list.remove(index);
    }
 
    @Override
    public int indexOf(Object o) {
        return list.indexOf(o);
    }
 
    @Override
    public int lastIndexOf(Object o) {
        return list.lastIndexOf(o);
    }
 
    @Override
    public ListIterator<E> listIterator() {
        return list.listIterator();
    }
 
    @Override
    public ListIterator<E> listIterator(int index) {
        return list.listIterator(index);
    }
 
    @Override
    public List<E> subList(int fromIndex, int toIndex) {
        return list.subList(fromIndex, toIndex);
    }
}