SpringBoot 官方文档示例：(35)使用JSR 303 对application.properties中配置的属性进行校验

一、在pom.xml中引入校验starter

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

二、创建配置类，并在类上加@Validated注解，然后在属性上加上JSR-303定义的校验注解

package cn.edu.tju.config;

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

import javax.validation.constraints.Min;

@Configuration
@ConfigurationProperties("my.test")
@Validated
public class AppConfig12 {

    @Min(18)
    private int age;

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

三、在application.properties中对属性进行配置

my.test.age=15

四、启动程序会报错：

Binding to target org.springframework.boot.context.properties.bind.BindException: Failed to bind properties under 'my.test' to cn.edu.tju.config.AppConfig12$$EnhancerBySpringCGLIB$$ef6b9a7a failed:

    Property: my.test.age
    Value: 15
    Origin: class path resource [application.properties] - 21:13
    Reason: 最小不能小于18

因为所配置的age没能通过最小为18的校验规则
五、改配置：

my.test.age=21

程序能够正常启动