Tomcat 实现了Java Servlet规范,Java Servlet Pages技术,不同版本的Tomcat支持不同的Servlet及JSP规范.

  • 最新示例图如下所示 :

不同版本的web.xml写法如下 :

  • web.xml v2.3

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    <?xml version="1.0" encoding="ISO-8859-1"?>  
    <!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>  
       <!-- ... -->
    </web-app>

  • web.xml v2.4

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    <?xml version="1.0" encoding="UTF-8"?>  
    <web-app id="WebApp_9" version="2.4" 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">  
    </web-app>

  • web.xml v2.5

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    <?xml version="1.0" encoding="UTF-8"?>  
    <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>

  • web.xml 3.0

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    <?xml version="1.0" encoding="UTF-8"?>  
    <web-app  
            version="3.0"  
            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">  
    </web-app>

  • web.xml 4.0

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    <?xml version="1.0" encoding="UTF-8"?> 
    <!DOCTYPE xml>
    <web-app  
            version="4.0"
            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_4_0.xsd">
    </web-app>