web.xml文件模板

 Servlet 2.3 deployment descriptor

注：web.xml中提示错误The content of element type "web-app" must match

该错误的原因是元素排放顺序有误，解决其实也很简单，按照上面的描述将各元素排序即可

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE web-app PUBLIC
  "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
  "http://java.sun.com/dtd/web-app_2_3.dtd" >
 <web-app>
     <icon></icon>
     <display-name></display-name>
     <description></description>
     <distributable />
     <context-param>
         <param-name></param-name>
         <param-value></param-value>
     </context-param>
     <filter>
         <filter-name></filter-name>
         <filter-class></filter-class>
         <init-param>
             <param-name></param-name>
             <param-value></param-value>
         </init-param>
     </filter>
     <filter-mapping>
         <filter-name></filter-name>
         <url-pattern></url-pattern>
     </filter-mapping>
     <listener>
         <listener-class></listener-class>
     </listener>
     <servlet>
         <servlet-name></servlet-name>
         <servlet-class></servlet-class>
         <init-param>
             <param-name></param-name>
             <param-value></param-value>
         </init-param>
     </servlet>
     <servlet-mapping>
         <servlet-name></servlet-name>
         <url-pattern></url-pattern>
     </servlet-mapping>
     <session-config></session-config>
     <mime-mapping>
         <extension></extension>
         <mime-type></mime-type>
     </mime-mapping>
     <welcome-file-list>
         <welcome-file></welcome-file>
     </welcome-file-list>
     <error-page>
         <error-code></error-code>
         <location></location>
     </error-page>
     <taglib>
         <taglib-uri></taglib-uri>
         <taglib-location></taglib-location>
     </taglib>
     <resource-env-ref>
         <description></description>
         <resource-env-ref-name></resource-env-ref-name>
         <resource-env-ref-type></resource-env-ref-type>
     </resource-env-ref>
     <resource-ref>
         <description></description>
         <res-ref-name></res-ref-name>
         <res-type></res-type>
         <res-auth></res-auth>
         <res-sharing-scope></res-sharing-scope>
     </resource-ref>
     <security-constraint>
         <display-name></display-name>
         <web-resource-collection>
             <web-resource-name></web-resource-name>
             <description></description>
         </web-resource-collection>
     </security-constraint>
     <login-config></login-config>
     <security-role>
         <description></description>
         <role-name></role-name>
     </security-role>
     <env-entry>
         <description></description>
         <env-entry-name></env-entry-name>
         <env-entry-value></env-entry-value>
         <env-entry-type></env-entry-type>
     </env-entry>
     <ejb-ref>
         <description></description>
         <ejb-ref-name></ejb-ref-name>
         <ejb-ref-type></ejb-ref-type>
         <home></home>
         <remote></remote>
         <ejb-link></ejb-link>
     </ejb-ref>
     <ejb-ref>
         <description></description>
         <ejb-ref-name></ejb-ref-name>
         <ejb-ref-type></ejb-ref-type>
         <home></home>
         <remote></remote>
         <ejb-link></ejb-link>
     </ejb-ref>
 </web-app>

Servlet 2.4 deployment descriptor

J2EE 1.4 XML schema, namespace is http://java.sun.com/xml/ns/j2ee

<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
          http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
          version="2.4">

  <display-name>Servlet 2.4 Web Application</display-name>
</web-app>

Servlet 2.5 deployment descriptor

Java EE 5 XML schema, namespace is http://java.sun.com/xml/ns/javaee

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
          http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
          version="2.5">
</web-app>

Servlet 3.0 deployment descriptor

Java EE 6 XML schema, namespace is http://java.sun.com/xml/ns/javaee

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
          http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
          version="3.0">
</web-app>

Servlet 3.1 deployment descriptor

Java EE 7 XML schema, namespace is http://xmlns.jcp.org/xml/ns/javaee/

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
         http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
</web-app>

仅做笔记！

参考文档地址：http://www.mkyong.com/web-development/the-web-xml-deployment-descriptor-examples/