Spring Boot uses validation to implement data verification through annotations

1. Dependence

		<!--https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-validation -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
            <version>2.3.3.RELEASE</version>
        </dependency>

Two, entity class

	@TableField("username")
    @NotBlank(message = "{user.name.notBlank}")
    private String username;
    @NotBlank(message = "{user.password.notBlank}")
    @TableField("password")
    private String password;
    @NotBlank(message = "{user.email.notBlank}")
    @Email(message = "{user.email.pattern}")
    @TableField("email")
    private String email;

Three, configuration

Looking LocalValidationFactoryBeanat the source code of the class, it is found that the default ValidationMessagesSourceprompt file for Spring Boot's verification error is the file in the resourcesfolderValidationMessages.properties

ValidationMessages.properties

user.name.notBlank=用户名不能为空
user.password.notBlank=密码不能为空
user.email.notBlank=邮箱不能为空
user.email.pattern=邮箱格式不正确

Four, Controller

/**
     * 添加用户
     *
     * @param user 用户对象
     * @return
     */
    @PostMapping("/insert")
    public ResultVO<Object> insert(@Validated @RequestBody User user, BindingResult bindingResult) {
    
    
        if (bindingResult.hasErrors()) {
    
    
            List<ObjectError> allErrors = bindingResult.getAllErrors();
            return ResultVOUtil.fail(allErrors.stream().map(ObjectError::getDefaultMessage).collect(Collectors.toList()));
        }
        userService.insert(user.doBuild());
        return ResultVOUtil.success();
    }

Five, effect

Six, reference notes

annotation	effect
@NotNull	Value cannot be empty
@Null	Value must be empty
@Pattern(regex=)	String must match regular expression
@Size(min, max)	The number of collection elements must be between min and max
@CreditCardNumber(ignoreNonDigitCharacters=)	The string must be a credit card number, verified according to US standards
@Email	The string must be an email address
@Length(min, max)	Check the length of the string
@NotBlank	The string cannot be an empty string
@NotEmpty	The string cannot be null, the collection must have elements
@Range(min, max)	Number must be greater than min, less than max
@SafeHtml	The string must be safe html
@URL	The string must be a valid URL
@AssertFalse	Value must be false
@AssertTrue	Value must be true
@DecimalMax(value=, inclusive=)	The value must be less than or equal to (inclusive=true)/less than (inclusive=false) the value specified by the attribute, and it can also be annotated on the string type attribute.
@DecimalMin(value=, inclusive=)	The value must be greater than or equal to (inclusive=true)/less than (inclusive=false) the value specified by the attribute, and it can also be annotated on a string type attribute.
@Digist(integer=,fraction=)	Number format check. integer specifies the maximum length of the integer part, fraction specifies the maximum length of the fractional part
@Future	Time must be in the future
@Past	Event must be past
@Max(value=)	The value must be less than or equal to the value specified by value. Cannot be annotated on string type attributes.
@Min(value=)	The value must be less than or equal to the value specified by value. Cannot be annotated on string type attributes

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