Spring SpEL--创建字符串和自定义对象映射的表达式语言

Question

sub.region.data={\
    AF: {'subRegionCd' : '34', 'subRegionName' : 'Southern Asia', 'subRegionDesc': '', 'status' : 'A'} \
}

@Value("#{${sub.region.data}}")
private Map<String, SubRegion> subRegionsMap; 

public class SubRegion {
    private String subRegionCd;
    private String subRegionName;
    private String subRegionDesc;
    private String subRegionStatus;
}

Caused by: org.springframework.beans.ConversionNotSupportedException: Failed to convert value of type 'java.util.Collections$UnmodifiableMap' to required type 'java.util.Map'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'java.util.Collections$UnmodifiableMap' to required type 'com.xxxxxx.model.SubRegion': no matching editors or conversion strategy found
    at org.springframework.beans.TypeConverterSupport.convertIfNecessary(TypeConverterSupport.java:76) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1195) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1167) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:593) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    ... 54 common frames omitted
Caused by: java.lang.IllegalStateException: Cannot convert value of type 'java.util.Collections$UnmodifiableMap' to required type 'com.xxxxxx.model.SubRegion': no matching editors or conversion strategy found
    at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:262) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.TypeConverterDelegate.convertToTypedMap(TypeConverterDelegate.java:608) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:182) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.TypeConverterSupport.convertIfNecessary(TypeConverterSupport.java:73) ~[spring-beans-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    ... 57 common frames omitted

Answer 1

看来您在'sub regiondesc'和之后犯了一个错误，我想您的意思是使用冒号，而不是逗号

对于spring boot，我建议您使用ConfigurationProperties，而不是@value。

例如，在这种情况下，您必须：

@ConfigurationProperties(prefix = "sub.region")
public static class SubRegionConfig {
    private Map<String, SubRegion> data;
    //getters and setters
} 

sub:
  region:
   data:
     AF:
      subRegionCd: '34'
      subRegionName: 'Southern Asia'
      subRegionDesc: ''
      subRegionStatus: 'A'

@Autowired
private SubRegionConfig subRegionConfig;