spring:
  application:
    name: @artifactId@
  cloud:
    nacos:
      discovery:
        server-addr: nacoshost:8848
      config:
        server-addr: ${spring.cloud.nacos.discovery.server-addr}
        file-extension: yml
        shared-dataids: application-${spring.profiles.active}.${spring.cloud.nacos.config.file-extension}
  autoconfigure:
    exclude: org.springframework.cloud.gateway.config.GatewayAutoConfiguration,org.springframework.cloud.gateway.config.GatewayClassPathWarningAutoConfiguration
  profiles:
    active: @profiles.active@

anything:
  isok: true
  sout: im.peizhi.wenjian

/*
@ConfigurationProperties作用：
将配置文件中配置的每一个属性的值，映射到这个组件中；
告诉SpringBoot将本类中的所有属性和配置文件中相关的配置进行绑定
参数 prefix = “person” : 将配置文件中的person下面的所有属性一一对应

只有这个组件是容器中的组件，才能使用容器提供的@ConfigurationProperties功能
*/
@Component //注册bean
@ConfigurationProperties(prefix = "anything")
public class Anything{
　　private Boolean isok;
　　private String sout ;
}

@Component //注册bean
public class Person {
    //直接使用@value
   @Value("${anything.isok}") //从配置文件中取值  
　　private Boolean isok;

@Component("role2")
public class Role2 {
//赋值long型
@Value("#{2}")
private Long id;
//字符串赋值
@Value("#{'role_name_2'}")
private String roleName;
//字符串赋值
@Value("#{'note_2'}")
private String note;
}

@Component("elBean")
public class ElBean {
//通过beanName获取bean，然后注入
@Value("#{role2}")
private Role2 role2;
//获取bean的属性id
@Value("#{role2.id}")
private Long id;
//调用bean的getNote方法，获取角色名称
// @Value("#{role.getNote().toString()}")
@Value("#{role2.getNote()?.toString()}")
private String note;
@Value("#{T(Math).PI}")
private double pi;
@Value("#{T(Math).random()}")
private double random;
@Value("#{role.id+1}")
private int num;
}

@PropertySource(value = "classpath:bootstrap.yml")
@Component //注册bean
public class Anything{
    @Value("${anything.isok}")
    private String name;
}

@ConfigurationProperties(
    prefix = "spring.http"
) //从配置文件中获取指定的值和bean的属性进行绑定
public class HttpProperties {
    private boolean logRequestDetails;
    private final HttpProperties.Encoding encoding = new HttpProperties.Encoding();

    public HttpProperties() {
    }

    public boolean isLogRequestDetails() {
        return this.logRequestDetails;
    }

    public void setLogRequestDetails(boolean logRequestDetails) {
        this.logRequestDetails = logRequestDetails;
    }

    public HttpProperties.Encoding getEncoding() {
        return this.encoding;
    }

    public static class Encoding {
        public static final Charset DEFAULT_CHARSET;
        private Charset charset;
        private Boolean force;
        private Boolean forceRequest;
        private Boolean forceResponse;
        private Map<Locale, Charset> mapping;
    }
}

@Configuration //表示这是一个配置类，以前编写的配置文件一样，也可以给容器中添加组件
//启动指定类的ConfigurationProperties功能；
//进入这个HttpProperties查看，将配置文件中对应的值和HttpProperties绑定起来；
//并把HttpProperties加入到ioc容器中
@EnableConfigurationProperties({HttpProperties.class}) 

//Spring底层@Conditional注解
//根据不同的条件判断，如果满足指定的条件，整个配置类里面的配置就会生效；
//这里的意思就是判断当前应用是否是web应用，如果是，当前配置类生效
@ConditionalOnWebApplication(
    type = Type.SERVLET
)

//判断当前项目有没有这个类CharacterEncodingFilter；SpringMVC中进行乱码解决的过滤器；
@ConditionalOnClass({CharacterEncodingFilter.class})

//判断配置文件中是否存在某个配置：spring.http.encoding.enabled；
//如果不存在，判断也是成立的
//即使我们配置文件中不配置pring.http.encoding.enabled=true，也是默认生效的；
@ConditionalOnProperty(
    prefix = "spring.http.encoding",
    value = {"enabled"},
    matchIfMissing = true
)

public class HttpEncodingAutoConfiguration {

    //他已经和SpringBoot的配置文件映射了
    private final Encoding properties;

    //只有一个有参构造器的情况下，参数的值就会从容器中拿
    public HttpEncodingAutoConfiguration(HttpProperties properties) {
        this.properties = properties.getEncoding();
    }

    //给容器中添加一个组件，这个组件的某些值需要从properties中获取
    @Bean
    @ConditionalOnMissingBean //判断容器没有这个组件？
    public CharacterEncodingFilter characterEncodingFilter() {
        CharacterEncodingFilter filter = new OrderedCharacterEncodingFilter();
        filter.setEncoding(this.properties.getCharset().name());
        filter.setForceRequestEncoding(this.properties.shouldForce(org.springframework.boot.autoconfigure.http.HttpProperties.Encoding.Type.REQUEST));
        filter.setForceResponseEncoding(this.properties.shouldForce(org.springframework.boot.autoconfigure.http.HttpProperties.Encoding.Type.RESPONSE));
        return filter;
    }
}