如何将application.yml中的类属性与具有不同类名的java类相匹配

Question

我正在使用Spring Framework，需要将application.yml中的class属性与具有不同class名称的java类进行匹配？

我有以下应用程序.yml文件：

service:
cms:
webClient:
basePath: http://www.example.com
connectionTimeoutSeconds: 3
readTimeoutSeconds: 3
url:
path: /some/path/
parameters:
tree: basic
credential:
username: misha
password: 123

和我的service.cms属性的java类：

// block A: It already works
@Getter
@Setter
@ConfigurationProperties(prefix = "service.cms")
public class CmsProperties {
private WebClientProperties webClient; // I want rename it to webClientProperties
private UrlProperties url;
private CredentialProperties credential;
}

其中WebClientProperties是

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
public class WebClientProperties {
private String basePath;
private int connectionTimeoutSeconds;
private int readTimeoutSeconds;
}

我想将java字段名称CmsProperties#webClient重命名为CmsProperties#WebClientProperties，但必须在application.yml中保留原始名称webClient。仅仅使用@Value而不是CmsProperties#webClient是不起作用的：

//Block B: `webClient` name is changed to `WebClientProperties`. 
// This what I want - but it did not work! 
@Getter
@Setter
@ConfigurationProperties(prefix = "service.cms")
public class CmsProperties {
@Value("${webClient}")
private WebClientProperties webClientProperties; // Name changed to `webClientProperties`
...
}

我有错误：

Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'webClient' in value "${webClient}"

有可能做到吗？

Answer 1

请看一下这里的类似问题

所以你不需要@Value("${webClient}")。只需创建一个setter:

public void setWebClient(WebClientProperties webClient) {
this.webClientProperties = webClient;
}

Answer 2

是的，下面的代码将工作

父属性类

@Configuration
@ConfigurationProperties(prefix = "service.cms")
public class PropertyReader {
public WebClient webClient;
}

---

子属性类

//GETTER SETTER removed 
public class WebClient {
@Value("${basePath}")
private String basePath;
@Value("${connectionTimeoutSeconds}")
private String connectionTimeoutSeconds;
@Value("${readTimeoutSeconds}")
private String readTimeoutSeconds;
}

application.yml

service:   
cms:
webClient:
basePath: http://www.example.com
connectionTimeoutSeconds: 3
readTimeoutSeconds: 3