通常在 bean.xml 裡我們常以 value 注入單純的資料,如 int,string、
也會注入 properties 檔裡的變數資料,如:
x-setting.properties -
com.transtep.xdna.doc.projplan.docDirLocation=tpma_doc
x-bean.xml -
<property name="docDirLocation">
<value>${com.transtep.xdna.doc.projplan.docDirLocation}</value>
</property>
但spring 3.0 使用 annotation 的時候,x-bean.xml 有些 bean 就不需要再宣告了,如 @Controller
而是自動讓 spring 去 scan 某 package 找到的,如此一來就無法注入 value
在 spring 3.0.M3 時加入了 @Value 這一個方便的 annotation 讓我們可以重拾 value 注入。
用法:
@Value("${com.transtep.xdna.doc.projplan.docDirLocation}")
private String docDirLocation = "";
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