将页面中的常见字符串值重构为某些 EL 常量
在 JSF 组件中，将常见常量（例如
<ui:composite>
<h:graphicImage library="mylib" name="/a/b/c/img1.png"/>
<h:graphicImage library="mylib" name="/a/b/c/img2.png"/>
<h:graphicImage library="mylib" name="/a/b/c/img3.png"/>
<!-- ... lots of repetitions -->
</ui:composite>
应该是
<ui:composite>
<-- assign /a/b/c/ to path -->
<h:graphicImage library="mylib" name="#{path}img1.png"/>
<h:graphicImage library="mylib" name="#{path}img2.png"/>
<h:graphicImage library="mylib" name="#{path}img3.png"/>
<!-- ... lots of repetitions -->
</ui:composite>
In a JSF component what is the best way to "refactor" common constants, e.g. names/paths in a <h:graphicImage> tag to a single local, temporary property?
<ui:composite>
<h:graphicImage library="mylib" name="/a/b/c/img1.png"/>
<h:graphicImage library="mylib" name="/a/b/c/img2.png"/>
<h:graphicImage library="mylib" name="/a/b/c/img3.png"/>
<!-- ... lots of repetitions -->
</ui:composite>
should be
<ui:composite>
<-- assign /a/b/c/ to path -->
<h:graphicImage library="mylib" name="#{path}img1.png"/>
<h:graphicImage library="mylib" name="#{path}img2.png"/>
<h:graphicImage library="mylib" name="#{path}img3.png"/>
<!-- ... lots of repetitions -->
</ui:composite>
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使用
; 确保
var="path"不与现有托管 Bean 名称或隐式 EL 变量等冲突。如有必要，您可以使用约定在其前面添加_。Use
<c:set>on application scope. This basically stores the variable in the application map.Make sure that the
var="path"doesn't conflict with existing managed bean names or implicit EL variables and such. You could if necessary use a convention to prefix it with_.为什么不使用复合组件。然后，当发生变化时，您不必到处更改 img1.png、img2.png 等。该路径可以作为参数提供。
Why not using a composite component. Then you don't have to change the img1.png, img2.png, ... etc all over the place when that changes. The path can the be supplied as a parameter.