eclipse web.xml 中的多个 URL 模式元素
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Multiple URL pattern elements in web.xml
提问by Ayusman
Is it OK to have multiple elements in the element in a J2EE web app version 2.4 compliant web.xml like this:
在 J2EE Web 应用程序版本 2.4 兼容的 web.xml 中的元素中是否可以有多个元素，如下所示：
<filter-mapping>
<filter-name>SomeFilter</filter-name>
<url-pattern>*.htm</url-pattern>
<url-pattern>*.do</url-pattern>
</filter-mapping>
I looked up the XSD "web-app_2_4.xsd" file from here : http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsdand the definition looks like this:
我从这里查找了 XSD“web-app_2_4.xsd”文件：http: //java.sun.com/xml/ns/j2ee/web-app_2_4.xsd，定义如下：
<xsd:complexType name="filter-mappingType">
<xsd:annotation>
<xsd:documentation>
some documentation here
</xsd:documentation>
</xsd:annotation>
<xsd:sequence>
<xsd:element name="filter-name"
type="j2ee:filter-nameType"/>
<xsd:choice>
<xsd:element name="url-pattern"
type="j2ee:url-patternType"/>
<xsd:element name="servlet-name"
type="j2ee:servlet-nameType"/>
</xsd:choice>
<xsd:element name="dispatcher"
type="j2ee:dispatcherType"
minOccurs="0" maxOccurs="4"/>
</xsd:sequence>
<xsd:attribute name="id" type="xsd:ID"/>
</xsd:complexType>
The URL pattern definition looks like this:
URL 模式定义如下所示：
So I think, we can have multiple elements in the element. My Eclipse IDE however does not seem to agree with me, and expects a 'dispatcher' tag.
所以我认为，我们可以在元素中有多个元素。然而，我的 Eclipse IDE 似乎不同意我的看法，并期望有一个“调度员”标签。
See image:
见图片：
采纳答案by Aleksandr M
Default is 1for maxOccursand minOccursin sequenceelement:
https://msdn.microsoft.com/en-us/library/ms256089(v=vs.110).aspx.
默认值是1为maxOccurs和minOccurs在sequence元素：
https://msdn.microsoft.com/en-us/library/ms256089(v=vs.110).aspx。
And choiceallows only one of the elements of it:
https://msdn.microsoft.com/en-us/library/ms256109(v=vs.110).aspx
并且choice只允许它的一个元素：https:
//msdn.microsoft.com/en-us/library/ms256109(v=vs.110).aspx
回答by Assen Kolov
Clearly no, but you can have:
显然不，但你可以：
<filter-mapping>
<filter-name>SomeFilter</filter-name>
<url-pattern>*.htm</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>SomeFilter</filter-name>
<url-pattern>*.do</url-pattern>
</filter-mapping>
