Application.yml的自定义属性的读取方式

public interface WeixinPayConstants { // 接口里面默认属性就是静态常量，可以缺深public static fianl

    // APID
    String APPID = "45645xxx2";
    // 商户号
    String MCID = "48xxxxx787";
    // 回调地址
    String CALLBACK_URL = "https://wxxxxxlback";
    // 私key
    String APISECRET = "SDFLKxxxxx23423423";

}

# 环境激活
spring:
  profiles:
    active: dev


#自定义属性，把上面接口的常量放这，冒号后面至少要有一个空格
ksd:
  weixin:
    appid: 456453sdfsd52342
    mcid: 48878787
    callbackurl: https://www.kuangstudy.com/pay/callback
    apiscret: SDFLKSDJFKLSJKLJ23423423

@Service
public class WeixinPayService {

    @Value("${ksd.weixin.appid}")
    private String appid;
    @Value("${ksd.weixin.mcid}")
    private String mcid;
    @Value("${ksd.weixin.callbackurl}")
    private String callbackurl;
    @Value("${ksd.weixin.apisecret}")
    private String apisecret;


    public void testvalue(){
        System.out.println(appid);
        System.out.println(mcid);
        System.out.println(callbackurl);
        System.out.println(apisecret);
    }
}

@ConfigurationProperties(prefix ="ksd.weixin")
public class WeixinPayProperties {
    // appid
    private String appid;
    // 商户号
    private String mcid;
    // 回调地址
    private String callbackurl;
    // api私钥
    private String apisecret;


    public String getAppid() {
        return appid;
    }

    public void setAppid(String appid) {
        this.appid = appid;
    }

    public String getMcid() {
        return mcid;
    }

    public void setMcid(String mcid) {
        this.mcid = mcid;
    }

    public String getCallbackurl() {
        return callbackurl;
    }

    public void setCallbackurl(String callbackurl) {
        this.callbackurl = callbackurl;
    }

    public String getApisecret() {
        return apisecret;
    }

    public void setApisecret(String apisecret) {
        this.apisecret = apisecret;
    }
}

@ConfigurationProperties(prefix ="ksd.weixin")
@EnableConfigurationProperties(WeixinPayProperties.class)
@Configuration
public class WeixinPayProperties {
			......
}

@Service
public class WeixinPayService {

    @Autowired
    private WeixinPayProperties weixinPayProperties;
    public void testvalue2() {
    System.out.println(weixinPayProperties.getAppid());
    System.out.println(weixinPayProperties.getApisecret());
    System.out.println(weixinPayProperties.getMcid());
   System.out.println(weixinPayProperties.getCallbackurl());
    }
}

 <!--把项目中的springboot自定义属性配置类生成一个元素数据文件，这个文件可以生成以后
  在未来的配置文件中，我们就达到和官方一致效果，可以自动提示-->
  <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-configuration-processor</artifactId>
      <optional>true</optional>
  </dependency>

mvn clean compile