[Spring Combat Series] () differences between different versions of servlet

1. Version 2.3 Version 2.3

"-//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>

This has one drawback :

" Web-app" must Match "(icon?,display-name?,description?,distributable?,context-param*,filter*, Filter-mapping*,listener*,servlet*,servlet-mapping*,session-config?,mime-mapping*,welcome-file-list?, error-page*,taglib*,resource-env-ref*,resource-ref*,security-constraint*,login-config?,security-role*, env-entry*,ejb-ref*,ejb-local-ref*) ". Eoso/webroot/web-inf

It means that the labels in the Web-app are in a certain order .

<! 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>Archetype Created Web Application</display-name>    <!--servlet-->    <servlet>        <servlet-name>Loginservlet</servlet-name>        <servlet-class>Com.qunar.fresh.servlet.LoginServlet</servlet-class>    </servlet>    <servlet-mapping>        <servlet-name>Loginservlet</servlet-name>        <url-pattern>/login.do</url-pattern>    </servlet-mapping>    <servlet>        <servlet-name>Accessservlet</servlet-name>        <servlet-class>Com.qunar.fresh.servlet.AccessServlet</servlet-class>    </servlet>    <servlet-mapping>        <servlet-name>Accessservlet</servlet-name>        <url-pattern>/a/*</url-pattern>    </servlet-mapping></web-app>

To be changed to:

<! 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>Archetype Created Web Application</display-name>    <!--servlet-->    <servlet>        <servlet-name>Loginservlet</servlet-name>        <servlet-class>Com.qunar.fresh.servlet.LoginServlet</servlet-class>    </servlet>    <servlet>        <servlet-name>Accessservlet</servlet-name>        <servlet-class>Com.qunar.fresh.servlet.AccessServlet</servlet-class>    </servlet>    <servlet-mapping>        <servlet-name>Loginservlet</servlet-name>        <url-pattern>/login.do</url-pattern>    </servlet-mapping>    <servlet-mapping>        <servlet-name>Accessservlet</servlet-name>        <url-pattern>/a/*</url-pattern>    </servlet-mapping></web-app>

2. Version 2.4 version 2.4

<web-app 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/J2EEhttp//java.sun.com/xml/ns/j2ee/web-app_2_4.xsd ">

The above issues can be resolved with more than 2.4 versions.

However, there is a problem with versions 2.4 and below: (multiple URLs cannot be mapped to the same servlet)

    <servlet-mapping>        <servlet-name>Mvc-dispatcher</servlet-name>        <url-pattern>/index</url-pattern>        <url-pattern>/login</url-pattern>    </servlet-mapping>

3. Version 2.5

<web-app xmlns=  "http://java.sun.com/xml/ns/ Java ee "  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 "; 

2.5 or later resolves a problem where multiple URLs cannot be mapped to the same servlet.

4. Version 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>

SERVLET3.0 is released with J2ee6, and the Web. XML configuration file contains: Default page configuration, session timeout configuration, and Error prompt page configuration.

<?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" ><session-config>        <session-timeout>30</session-timeout>    </session-config>    <welcome-file-list>        <welcome-file>index.jsp</welcome-file>    </welcome-file-list>    <error-page>        <error-code>404</error-code>        <location>/404.jsp</location>    </error-page>    <error-page>        <error-code>500</error-code>        <location>/500.jsp</location>    </error-page></web-app>

[Spring Combat Series] () differences between different versions of servlet