Spring SpEL-用于创建字符串和自定义对象映射的表达语言

小编典典

Spring SpEL-用于创建字符串和自定义对象映射的表达语言

spring-boot

我正在使用 Spring Boot 示例从属性文件中读取以下内容。

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

我在下面用过，但是不起作用

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

SubRegion.java

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

我低于错误

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

阅读 510

2020-05-30

共1个答案

小编典典

看来您之后犯了一个错误'subRegionDesc',，我认为您的意思是使用冒号，而不是逗号

通过Spring Boot，我建议您使用ConfigurationProperties而不是@Value。

例如，在这种情况下，您必须：

放入@EnableConfigurationProperties(SubRegionConfig.class)您的spring配置类之一。
创建配置类：

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

使用.yml代替.properties，例如：

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

之后，您可以从中获得所需的所有属性。 SubRegionConfing

        @Autowired
    private SubRegionConfig subRegionConfig;

ConfigurationsProperties 在大多数情况下更复杂，但更易于使用。

2020-05-30