@Value使用@PropertySource注释时未解决。如何配置PropertySourcesPlaceholderConfigurer？ [英] @Value not resolved when using @PropertySource annotation. How to configure PropertySourcesPlaceholderConfigurer?

问题描述

我有以下配置类：

@Configuration
@PropertySource(name = "props", value = "classpath:/app-config.properties")
@ComponentScan("service")
public class AppConfig {

我有属性服务：

@Component 
public class SomeService {
    @Value("#{props['some.property']}") private String someProperty;

当我想使用

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'someService': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.lang.String service.SomeService.someProperty; nested exception is org.springframework.beans.factory.BeanExpressionException: Expression parsing failed; nested exception is org.springframework.expression.spel.SpelEvaluationException: EL1008E:(pos 0): Field or property 'props' cannot be found on object of type 'org.springframework.beans.factory.config.BeanExpressionContext' 

此问题已记录在 in SPR-8539

但无论如何，我无法找出如何配置 PropertySourcesPlaceholderConfigurer 以使其工作。

but anyway I cannot figure out how to configure PropertySourcesPlaceholderConfigurer to get it work.

此方法适用于xml配置

This approach works well with xml configuration

<util:properties id="props" location="classpath:/app-config.properties" />

但我想使用java进行配置。

but I want to use java for configuration.

推荐答案

如果使用@PropertySource，属性必须检索：

If you use @PropertySource, properties have to be retrieved with:

@Autowired
Environment env;
// ...
String subject = env.getProperty("mail.subject");

如果要使用@Value（$ {mail.subject}）检索，用xml注册prop prop占位符。

If you want to retrieve with @Value("${mail.subject}"), you have to register the prop placeholder by xml.

原因：
https://jira.springsource.org/browse/SPR-8539

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