Spring Boot - 从属性文件注入映射[重复]

属性文件如下所示：

url1=path_to_binary1
url2=path_to_binary2

根据this我尝试了以下方法：

@Component
@EnableConfigurationProperties
public class ApplicationProperties {
    private Map<String, String> pathMapper;

    //get and set
}

在另一个组件中，我自动装配了 ApplicationProperties：

@Autowired
private ApplicationProperties properties;         
      //inside some method:
      properties.getPathMapper().get(appName);

产生NullPointerException.

如何纠正呢？

update

我根据 user7757360 的建议有正确的：

@Component
@EnableConfigurationProperties
@ConfigurationProperties(prefix="app")
public class ApplicationProperties {

和属性文件：

app.url1=path_to_binary1
app.url2=path_to_binary2

还是不行

Update 2

@Component
@EnableConfigurationProperties
@ConfigurationProperties(prefix="app")
public class ApplicationProperties {
    private Map<String, String> app;

和里面application.properties:

app.url1=path_to_binary1
app.url2=path_to_binary2

还是不行

如果您能为属性文件提供更具体的示例，将会很有帮助。您应该在 url1 和 url2 中具有相同的前缀，然后您可以使用

@ConfigurationProperties(prefix="my")

as in

my.pathMapper.url1=path_to_binary1 my.pathMapper.url2=path_to_binary2

@Component
@EnableConfigurationProperties
@ConfigurationProperties(prefix="my")
public class ApplicationProperties {
    private Map<String, String> pathMapper;

    //get and set for pathMapper are important
}

更多信息请访问https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-external-config.html#boot-features-external-config-loading-yaml