java - Spring Boot - 从 application.yml 注入(inject)静态映射

Question

我提到了Spring Boot - inject map from application.yml用于从 application.yml 文件注入(inject) map

我的 application.yml 片段如下

easy.app.pairMap:
    test1: 'value1' 
    test2: 'value2'

属性文件如下

@Component
@Configuration
@ConfigurationProperties("easy.app")
@EnableConfigurationProperties
public class TestProperties {



private Map<String, String> pairMap= new HashMap<String, String>();

public void setPairMap(Map<String, String> pairMap) {
    this.pairMap= pairMap;
}

}

上面给出的代码有效。当“pairMap”设置为静态时，不会从 application.yml 文件中读取 Map，如下所示。

@Component
@Configuration
@ConfigurationProperties("easy.app")
@EnableConfigurationProperties
public class TestProperties {



private static Map<String, String> pairMap= new HashMap<String, String>();

public static void setPairMap(Map<String, String> pairMap) {
    TestProperties .pairMap= pairMap;
}

}

PS:问题仅在注入(inject) map 时出现，但在注入(inject) string 时不出现。为什么会出现这种行为？

即以下配置中的字符串注入(inject)有效，但 map 注入(inject)无效

easy.app.key1: 'abc'

easy.app.pairMap:
     test1: 'value1' 
     test2: 'value2'

属性文件如下

@Component
@Configuration
@ConfigurationProperties("easy.app")
@EnableConfigurationProperties
public class TestProperties {



private Map<String, String> pairMap= new HashMap<String, String>();

private static String key1;

public static void setPairMap(Map<String, String> pairMap) {
    this.pairMap= pairMap;
}

public static void setKey1(String key1) {
    TestProperties.key1= key1;
}



public String getKey1(){
    return key1;
}

Answer 1

解决这个问题:

easy:
  app:
    pairMap:
      test1: value1
      test2: value2

 @CompileStatic
 @Component
 @EnableConfigurationProperties
 class ConfigHolder {

   @Value(value = '${easy.app.pairMap.test1}')
   String test1Valse;

   @Value(value = '${easy.app.pairMap.test2}')
   String test2Valse;
 }



@CompileStatic
@Configuration
@EnableConfigurationProperties
public class TestProperties {

  @Autowired
  ConfigHolder configHolder;



  private Map<String, String> pairMap= new HashMap<String, String>();


  public void setPairMap(Map<String, String> pairMap) {
     if(pairMap != null && !pairMap.isNotEmpty()) {
        this.pairMap = pairMap;
     } else {
        this.pairMap.put("test 1", ${configHolder.test1Valse});
        this.pairMap.put("test 2", ${configHolder.test2Valse});
     }
  }

}