请教：关于jsp运行的问题？

Question

你看看，root和examples 中的WEB-INF .xml那个文件有没有改动，看看有什么区别，调整后要重启

Answer 1

这是Root下的web.xml:<?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>
  <display-name>Welcome to Tomcat</display-name>
  <description>
     Welcome to Tomcat
  </description>
</web-app>

Answer 2

这是examples下的web.xml：<?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>    <display-name>Tomcat Examples</display-name>
    <description>
      Tomcat Example servlets and JSP pages.
    </description>    <!-- Define servlet-mapped and path-mapped example filters -->
    <filter>
        <filter-name>Servlet Mapped Filter</filter-name>
        <filter-class>filters.ExampleFilter</filter-class>
<init-param>
    <param-name>attribute</param-name>
    <param-value>filters.ExampleFilter.SERVLET_MAPPED</param-value>
</init-param>
    </filter>
    <filter>
        <filter-name>Path Mapped Filter</filter-name>
        <filter-class>filters.ExampleFilter</filter-class>
<init-param>
    <param-name>attribute</param-name>
    <param-value>filters.ExampleFilter.PATH_MAPPED</param-value>
</init-param>
    </filter>
    <filter>
        <filter-name>Request Dumper Filter</filter-name>
        <filter-class>filters.RequestDumperFilter</filter-class>
    </filter>    <!-- Example filter to set character encoding on each request -->
    <filter>
        <filter-name>Set Character Encoding</filter-name>
        <filter-class>filters.SetCharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>EUC_JP</param-value>
        </init-param>
    </filter>    <filter>
        <filter-name>Compression Filter</filter-name>
        <filter-class>compressionFilters.CompressionFilter</filter-class>        <init-param>
          <param-name>compressionThreshold</param-name>
          <param-value>10</param-value>
        </init-param>
        <init-param>
          <param-name>debug</param-name>
          <param-value>0</param-value>
        </init-param>
    </filter>    <!-- Define filter mappings for the defined filters -->
    <filter-mapping>
        <filter-name>Servlet Mapped Filter</filter-name>
<servlet-name>invoker</servlet-name>
    </filter-mapping>
    <filter-mapping>
        <filter-name>Path Mapped Filter</filter-name>
<url-pattern>/servlet/*</url-pattern>
    </filter-mapping>

Answer 3

<!-- Example filter mapping to apply the "Set Character Encoding" filter
     to *all* requests processed by this web application -->
<!--
    <filter-mapping>
        <filter-name>Set Character Encoding</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
--><!--
    <filter-mapping>
      <filter-name>Compression Filter</filter-name>
      <url-pattern>/CompressionTest</url-pattern>
    </filter-mapping>
--><!--
    <filter-mapping>
        <filter-name>Request Dumper Filter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
-->    <!-- Define example application events listeners -->
    <listener>
        <listener-class>listeners.ContextListener</listener-class>
    </listener>
    <listener>
        <listener-class>listeners.SessionListener</listener-class>
    </listener>    <!-- Define servlets that are included in the example application -->    <servlet>
        <servlet-name>SendMailServlet</servlet-name>
        <servlet-class>SendMailServlet</servlet-class>
    </servlet>    <servlet>
        <servlet-name>
            snoop
        </servlet-name>
        <servlet-class>
            SnoopServlet
        </servlet-class>
<!--
        <init-param>
            <param-name>foo</param-name>
            <param-value>bar</param-value>
        </init-param>
-->
        <run-as>
            <description>Security role for anonymous access</description>
            <role-name>tomcat</role-name>
        </run-as>
    </servlet>    <servlet>
      <servlet-name>
          servletToJsp
      </servlet-name>
      <servlet-class>
          servletToJsp
      </servlet-class>
    </servlet>
        <servlet>
        <servlet-name>
            CompressionFilterTestServlet
        </servlet-name>
        <servlet-class>
            compressionFilters.CompressionFilterTestServlet
        </servlet-class>    </servlet>    <servlet-mapping>
        <servlet-name>invoker</servlet-name>
        <url-pattern>/servlet/*</url-pattern>
    </servlet-mapping>    <servlet-mapping>
        <servlet-name>
            CompressionFilterTestServlet
        </servlet-name>
        <url-pattern>
            /CompressionTest
        </url-pattern>
    </servlet-mapping>    <servlet-mapping>
        <servlet-name>SendMailServlet</servlet-name>
        <url-pattern>/SendMailServlet</url-pattern>
    </servlet-mapping>    <servlet-mapping>
        <servlet-name>
            snoop
        </servlet-name>
        <url-pattern>
            /snoop
        </url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>
            servletToJsp
        </servlet-name>
        <url-pattern>
            /servletToJsp
        </url-pattern>
    </servlet-mapping>    <taglib>
        <taglib-uri>
   http://jakarta.apache.org/tomcat/debug-taglib
        </taglib-uri>
        <taglib-location>
           /WEB-INF/jsp/debug-taglib.tld
        </taglib-location>
    </taglib>    <taglib>
        <taglib-uri>
   http://jakarta.apache.org/tomcat/examples-taglib
        </taglib-uri>
        <taglib-location>
           /WEB-INF/jsp/example-taglib.tld
        </taglib-location>
    </taglib>    <resource-ref>
      <res-ref-name>mail/Session</res-ref-name>
      <res-type>javax.mail.Session</res-type>
      <res-auth>Container</res-auth>
    </resource-ref>    <security-constraint>
      <display-name>Example Security Constraint</display-name>
      <web-resource-collection>
         <web-resource-name>Protected Area</web-resource-name>
 <!-- Define the context-relative URL(s) to be protected -->
         <url-pattern>/jsp/security/protected/*</url-pattern>
 <!-- If you list http methods, only those methods are protected -->
 <http-method>DELETE</http-method>
         <http-method>GET</http-method>
         <http-method>POST</http-method>
 <http-method>PUT</http-method>
      </web-resource-collection>
      <auth-constraint>
         <!-- Anyone with one of the listed roles may access this area -->
         <role-name>tomcat</role-name>
 <role-name>role1</role-name>
      </auth-constraint>
    </security-constraint>