我制作了一个带有支持组件的复合组件:
复合组件的Xhtml:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://xmlns.jcp.org/jsf/html"
xmlns:p="http://primefaces.org/ui"
xmlns:composite="http://java.sun.com/jsf/composite" xmlns:c="http://java.sun.com/jsp/jstl/core">
<composite:interface componentType="editorCompositeComponent">
<!-- ...bunch of attributes... -->
<composite:attribute name="content" type="java.lang.String" default="" />
</composite:interface>
<composite:implementation>
<!-- ... other components ... -->
<p:editor widgetVar="editorWidget" value="#{cc.attrs.content}" width="600" maxlength="8000" />
<p:commandButton action="#{cc.save(cc.attrs.caseId)}" value="Save" />
</composite:implementation>
</html>
支持组件:
@FacesComponent("editorCompositeComponent")
public class EditorCompositeComponent extends UINamingContainer {
private String content;
// bunch of other variables
public void save(String caseId) {
MemoFile memoFile = new MemoFile();
memoFile.setContent(content);
memoFileService = new MemoFileService();
// Normally this service would be Injected but Injection
// isn't possible in @FacesComponent
memoFileService.save(memoFile);
// the save-method just calls EntityManager's merge etc.
// It works well in all the ManagedBeans
}
// all the getters and setters
}
那么,不能注入东西,从而无法找到EntityManager,那么如何在复合组件中保存编辑器的内容呢?
答案 0 :(得分:1)
UI组件不支持依赖注入。这有点太过紧密的责任耦合了。 UI组件实例不应该由容器管理。
最好的办法是为任务创建一个单独的请求范围的托管bean。
@Named
@RequestScoped
public class EditorCompositeBean {
// ...
}
您可以将复合组件实例传递给其操作方法:
<p:commandButton ... action="#{editorCompositeBean.save(cc)}" />
或者使用该bean作为模型:
<composite:interface componentType="editorCompositeComponent">
<composite:attribute name="value" type="com.example.EditorCompositeBean" />
</composite:interface>
<composite:implementation>
<p:editor ... value="#{cc.attrs.value.content}" />
<p:commandButton ... action="#{cc.attrs.value.save}" />
</composite:implementation>