@NotBlank不生效的現象

　　1、添加依賴：(兩個依賴都要添加)

<!-- https://mvnrepository.com/artifact/javax.validation/validation-api -->
        <dependency>
            <groupId>javax.validation</groupId>
            <artifactId>validation-api</artifactId>
            <version>2.0.1.Final</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.hibernate.validator/hibernate-validator -->
        <dependency>
            <groupId>org.hibernate.validator</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>7.0.0.Alpha3</version>
        </dependency>

2、添加注解：

    /**
     * 品牌名
     */
    @NotBlank
    private String name;

3、開啟驗證：

   /**
     * 保存
     */
    @RequestMapping("/save")
    public R save(@Valid @RequestBody BrandEntity brand){
        brandService.save(brand);

        return R.ok();
    }