java 从 Spring @Configuration 类自动装配字符串？
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Autowire a string from Spring @Configuration class?
提问by css
I'm looking to centralize access to all of my property values so that I can do things like make sure everything uses the same name for properties, the same default values, etc. I've created a class to centralize all of this, but I'm not sure how the classes that need access to these values should get them, since you can't autowire Strings.
我希望集中访问我所有的属性值，以便我可以做一些事情，例如确保所有属性都使用相同的名称、相同的默认值等。我创建了一个类来集中所有这些，但是我不确定需要访问这些值的类应该如何获取它们，因为您不能自动装配字符串。
My class is something like this:
我的课是这样的：
@Configuration
public class SpringConfig {
@Autowired
@Value("${identifier:asdf1234}")
public String identifier;
}
Where I might use it in multiple classes
我可以在多个课程中使用它的地方
public class Foo {
@Autowired
private String theIdentifier;
}
public class Bar {
@Autowired
private String anIdentifier;
}
采纳答案by Christophe L
Another solution would be to create a Spring bean with all your configuration and autowire it:
另一种解决方案是使用您的所有配置创建一个 Spring bean 并自动装配它：
@Component
public class MyConfig {
@Value("${identifier:asdf1234}")
public String identifier;
public String getIdentifier() {
return identifier;
}
}
And in your other classes:
在您的其他课程中：
public class Foo {
@Autowired
private MyConfig myConfig;
public void someMethod() {
doSomething(myConfig.getIdentifier());
}
}
回答by Ricardo Veguilla
Initialized a String bean based on the property:
根据属性初始化一个String bean：
@Configuration
public class SpringConfig {
@Bean
public String identifier(@Value("${identifier:asdf1234}") identifier) {
return identifier;
}
}
Then inject it by bean name using Spring's SpELbeanName expression "#{beanName}in a @Valueannotation
然后在注解中使用Spring 的 SpELbeanName 表达式通过 bean 名称注入它"#{beanName}@Value
@Component
public class Foo {
@Value("#{identifier}")
private String oneIdentifier;
}
public class Bar {
@Value("#{identifier}")
private String sameIdentifier;
}
回答by Sotirios Delimanolis
There's no clean solution to this, in my opinion. The simplest I can think of is to use a staticconstant Stringfield that holds the property placeholder.
在我看来，没有干净的解决方案。我能想到的最简单的方法是使用一个static常量String字段来保存属性占位符。
public final class Constants {
private Constants() {}
public static final String PROPERTY_NAME= "${identifier.12345}";
}
and have all @Valueannotations use it
并让所有@Value注释都使用它
public class Foo {
@Value(Constants.PROPERTY_NAME)
private String theIdentifier;
}
public class Bar {
@Value(Constants.PROPERTY_NAME)
private String anIdentifier;
}
Now, if you ever need to change the property name, you only need to change it in Constants. But make sure to recompile everything.
现在，如果您需要更改属性名称，只需在Constants. 但请确保重新编译所有内容。
