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/