spring-boot骆驼案例嵌套属性作为环境变量

问题描述

我有一个spring boot应用程序，并且希望通过环境变量在一个以@ConfigurationProperties注释的类中设置一个第二层嵌套属性，即驼峰式.这是该类的示例:

I have a spring boot application and want to set, though environment variables, in a class annotated with @ConfigurationProperties a second level nested property which is camel case. Here is an example of the class:

@SpringBootApplication
@EnableConfigurationProperties(SpringApp.Props.class)
@RestController
public class SpringApp {

  private Props props;

  @ConfigurationProperties("app")
  public static class Props {
    private String prop;
    private Props nestedProps;

    public String getProp() {
      return prop;
    }

    public void setProp(String prop) {
      this.prop = prop;
    }

    public Props getNestedProps() {
      return nestedProps;
    }

    public void setNestedProps(Props nestedProps) {
      this.nestedProps = nestedProps;
    }

  }

  @Autowired
  public void setProps(Props props) {
    this.props = props;
  }

  public static void main(String[] args) {
    SpringApplication.run(SpringApp.class, args);
  }

  @RequestMapping("/")
  Props getProps() {
    return props;
  }

}

当我尝试使用以下环境变量运行应用程序时:

when I try to run the application with following environment variables:

APP_PROP=val1
APP_NESTED_PROPS_PROP=val2
APP_NESTED_PROPS_NESTED_PROPS_PROP=val3

我从服务中得到以下回应:

I'm getting following response from the service:

{
  "prop": "val1",
  "nestedProps": {
    "prop": "val2",
    "nestedProps": null
  }
}

这是预期的行为吗?我期待这样的事情:

Is this the expected behavior? I was expecting something like this:

{
  "prop": "val1",
  "nestedProps": {
    "prop": "val2",
    "nestedProps": {
      "prop": "val3",
      "nestedProps": null
    }
  }
}

当我通过应用程序参数(例如:--app.prop=val1 --app.nestedProps.prop=val2 --app.nestedProps.nestedProps.prop=val3)设置属性时，得到了预期的响应.

When I am setting the properties through application parameters (eg: --app.prop=val1 --app.nestedProps.prop=val2 --app.nestedProps.nestedProps.prop=val3), I'm getting expected response.

是否有使用环境变量且无需修改代码即可获得预期行为的解决方法?

Is there any workaround using environment variables and without modifying the code to get the expected behavior?

注意:我进行了一些调试，似乎问题出在org.springframework.boot.bind.RelaxedNames上，而不是针对这种情况生成候选对象.这是我为证明它的测试(失败):

Note: I did some debugging and seems the problem is originated in org.springframework.boot.bind.RelaxedNames not generating candidates for this cases. Here is a test I did to demonstrate it (it fails):

@Test
public void shouldGenerateRelaxedNameForCamelCaseNestedPropertyFromEnvironmentVariableName() {
  assertThat(new RelaxedNames("NESTED_NESTED_PROPS_PROP"), hasItem("nested.nestedProps.prop"));
}

推荐答案

我会尝试使用NESTED_NESTEDPROPS_PROP，bcs'nestedProps'是一个属性

I would try with the NESTED_NESTEDPROPS_PROP, bcs 'nestedProps' is one property

来源: https://github.com/spring -projects/spring-boot/wiki/Relaxed-Binding-2.0

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