Java 用弹簧注入字符串的快捷方式
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shortcut for injecting strings with spring
提问by naumcho
I inject Strings in my spring config by doing the following:
我通过执行以下操作在我的 spring 配置中注入字符串：
<bean class="java.lang.String">
<constructor-arg type="java.lang.String" value="Region" />
</bean>
Is there a shorter way of doing it?
有没有更短的方法？
Update:I am using spring 3.0.3.
更新：我使用的是 spring 3.0.3。
These are actually used to populate a list:
这些实际上用于填充列表：
<list>
<bean class="java.lang.String">
<constructor-arg type="java.lang.String" value="Region" />
</bean>
...
Seems like this works:
看起来像这样：
<list>
<value>Region</value>
<value>Name</value>
....
But I agree with the suggestions that this should eventually go in a property and be passed in.
但我同意这最终应该进入财产并被传递的建议。
采纳答案by Sotirios Delimanolis
You should not have Stringbeans. Just use their value directly.
你不应该吃String豆子。直接使用它们的值即可。
Create a properties file strings.propertiesand put it on the classpath
创建一个属性文件strings.properties并将其放在类路径中
strings.key=Region
Declare a PropertyPlaceholderConfigurer
声明一个 PropertyPlaceholderConfigurer
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location">
<value>strings.properties</value>
</property>
</bean>
Then annotate instance field Strings as
然后将实例字段字符串注释为
@Value("${strings.key}")
private String key;
Spring will inject the value from the strings.propertiesfile into this keyString.
Spring 会将strings.properties文件中的值注入到这个keyString 中。
This obviously assumes that the class in which the @Valueannotation appears is a bean managed in the same context as the PropertyPlaceholderConfigurer.
这显然假定@Value注解出现的类是在与PropertyPlaceholderConfigurer.
回答by Aaron Digulla
There is no need to create a bean of type String. Just pass the value to constructor-arg:
无需创建类型为 的 bean String。只需将值传递给constructor-arg：
<bean id="foo" class="x.y.Foo">
<constructor-arg value="Region"/>
</bean>
works.
作品。
回答by ikumen
In addition to the other answers and if you're using Spring 3.1+, you can use the constructor namespace.
除了其他答案之外，如果您使用的是 Spring 3.1+，则可以使用构造函数命名空间。
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:c="http://www.springframework.org/schema/c" <-- add c namespace
...
<bean id="someClass" class="a.b.c.SomeClass"
c:someProperty="Region"
/>
