web.xml不同版本的区别

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servlet 2.3

<!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>  <display-name>Servlet 2.3 Web Application</display-name></web-app>

servlet 2.4

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

servlet 2.5

<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>  <display-name>Servlet 2.5 Web Application</display-name></web-app>

servlet 3.0

<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>  <display-name>Servlet 3.0 Web Application</display-name></web-app>

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