<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <!--引入SpringBoot依赖-->
   <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.4</version>
    </parent>
    
    <groupId>com.tab343</groupId>
    <artifactId>mySpringboot</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <!--spring-boot-starter-parent的父级spring-boot-dependencies定义了validation的依赖，所以这里不必指定版本-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>

        <!-- 因为示例采用web方式，所以加入web依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    
    </dependencies>
</project>

@RestController
@Slf4j
@RequestMapping("/validation")
@Validated//校验注解，标注在类上表示该类所有方法都进行校验,如果只标注在方法，表示只根据校验注解检查此方法上的参数
public class MyValidationController {   
@RequestMapping("/methodParam")
    public void testMethodParam(@Size(min = 5, max = 10,
     message = "字符长度超出了范围!") String code){
        log.info("code is {}",code);
    }
}

public class MyPerson {

    @NotBlank(message = "id不可为空!")
    private String id;
    
    @Size(max = 255,min = 1, message = "姓名不可为空!")
    private String name;
}