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Springboot 读取yml中的值作为参数，有2种写法：

例子：

已知有如下yml配置：

  myapps:1131f78c313e11e79da3000c298bdf0e: AMS系统1ae211c543a14cf6981274fec3281f0c: BMS系统app1: 测试   

现在需要将myapps读到配置文件作为配置类。有2种做法：

1、配置类集中放置

也就是说应用中设一个配置类，所有涉及yml配置的类都放置在该类中。

@Configuration
@Order(Ordered.HIGHEST_PRECEDENCE)
public class MyConfiguration {static Logger log = LoggerFactory.getLogger(MyConfiguration.class);@Beanpublic static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() {return new PropertySourcesPlaceholderConfigurer();}	@Value("${px.a.trackerServer}")String trackerServer = ""; @Value("${px.a.disabled:true}")boolean disableA = true;@Bean@ConfigurationProperties(prefix = "px.client")ClientConfigInfo clientConfigInfo(){ClientConfigInfo clientConfigInfo = new ClientConfigInfo();		return clientConfigInfo;}@Bean@ConfigurationProperties(prefix = "px")MyAppConfiguration myAppConfiguration(){MyAppConfiguration myAppConfiguration = new MyAppConfiguration ();return myAppConfiguration;}}

这里配置为：

    @Bean
    @ConfigurationProperties(prefix = "px")
    UdsAppConfiguration udsAppConfiguration(){
        UdsAppConfiguration udsAppConfiguration = new UdsAppConfiguration();
        return udsAppConfiguration;
    }

2、配置类单独放置

也就是说把MyAppConfiguration单独作为一个配置类进行单独的组装。

@Component  
@ConfigurationProperties(prefix="px", ignoreInvalidFields=true, ignoreUnknownFields=true)
public class MyAppConfiguration {static Logger log = LoggerFactory.getLogger(MyAppConfiguration.class);private Map<String, String> mysapps = new HashMap<String, String>();public Map<String, String> getMyapps() {return myapps;}public void setMyapps(Map<String, String> myapps) {this.myapps = myapps;} }

3、List读取

（1）yml

  myapps:- 1131f78c313e11e79da3000c298bdf0e: AMS系统- 1ae211c543a14cf6981274fec3281f0c: BMS系统- app1: 测试  

（2）配置类写法

@Component  
@ConfigurationProperties(prefix="px", ignoreInvalidFields=true, ignoreUnknownFields=true)
public class MyAppConfiguration {static Logger log = LoggerFactory.getLogger(MyAppConfiguration.class);private List<Map<String, String>> mysapps = new ArrayList<Map<String, String>>(); public List<Map<String, String>> getMyapps() {return myapps;}public void setMyapps(List<Map<String, String>> myapps) {this.myapps = myapps;}}

4、问题：配置类没有获取到值

该问题的原因很可能是yml中定义的key与配置类中定义的属性名称不一致，导致Springboot自动装配时失败。出现该问题后，一定首先要仔细检查配置类对应属性的名称以及配置类映射的路径。