6.1 加入依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-validation</artifactId>
</dependency>

6.2 在实体类上加注解

在实体类上加入@Validated注解。并且在属性上方加入@Emall(message="邮箱不符合要求")，则如果该属性不满足邮箱的格式，就会报错。

package jiang.com.helloworld.pojo;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
import org.springframework.validation.annotation.Validated;

import javax.validation.constraints.Email;

@Component
@ConfigurationProperties(prefix = "cat")
@Validated
public class Cat {
    @Email(message = "邮箱地址不符合规范！")
    private String catName;
    private Integer catAge;

    @Override
    public String toString() {
        return "Cat{" +
                "catName='" + catName + '\'' +
                ", catAge=" + catAge +
                '}';
    }

    public String getCatName() {
        return catName;
    }

    public void setCatName(String catName) {
        this.catName = catName;
    }

    public Integer getCatAge() {
        return catAge;
    }

    public void setCatAge(Integer catAge) {
        this.catAge = catAge;
    }

    public Cat(String catName, Integer catAge) {
        this.catName = catName;
        this.catAge = catAge;
    }

    public Cat() {
    }
}