web.xml

这是一个完整的web应用程序

<?xml version="1.0" encoding="ISO-8859-1"?>
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  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
  this work for additional information regarding copyright ownership.
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      http://www.apache.org/licenses/LICENSE-2.0

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  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
-->
<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">

  <!-- ======================== Introduction ============================== -->
  <!-- This document defines default values for *all* web applications      -->
  <!-- loaded into this instance of Tomcat.  As each application is         -->
  <!-- deployed, this file is processed, followed by the                    -->
  <!-- "/WEB-INF/web.xml" deployment descriptor from your own               -->
  <!-- applications.                                                        -->
  <!--                                                                      -->
  <!-- WARNING:  Do not configure application-specific resources here!      -->
  <!-- They should go in the "/WEB-INF/web.xml" file in your application.   -->


  <!-- ================== Built In Servlet Definitions ==================== -->


  <!-- The default servlet for all web applications, that serves static     -->
  <!-- resources.  It processes all requests that are not mapped to other   -->
  <!-- servlets with servlet mappings (defined either here or in your own   -->
  <!-- web.xml file.  This servlet supports the following initialization    -->
  <!-- parameters (default values are in square brackets):                  -->
  <!--                                                                      -->
  <!--   debug               Debugging detail level for messages logged     -->
  <!--                       by this servlet.  [0]                          -->
  <!--                                                                      -->
  <!--   fileEncoding        Encoding to be used to read static resources   -->
  <!--                       [platform default]                             -->
  <!--                                                                      -->
  <!--   input               Input buffer size (in bytes) when reading      -->
  <!--                       resources to be served.  [2048]                -->
  <!--                                                                      -->
  <!--   listings            Should directory listings be produced if there -->
  <!--                       is no welcome file in this directory?  [false] -->
  <!--                       WARNING: Listings for directories with many    -->
  <!--                       entries can be slow and may consume            -->
  <!--                       significant proportions of server resources.   -->
  <!--                                                                      -->
  <!--   output              Output buffer size (in bytes) when writing     -->
  <!--                       resources to be served.  [2048]                -->
  <!--                                                                      -->
  <!--   readonly            Is this context "read only", so HTTP           -->
  <!--                       commands like PUT and DELETE are               -->
  <!--                       rejected?  [true]                              -->
  <!--                                                                      -->
  <!--   readmeFile          File name to display with the directory        -->
  <!--                       contents. [null]                               -->
  <!--                                                                      -->
  <!--   sendfileSize        If the connector used supports sendfile, this  -->
  <!--                       represents the minimal file size in KB for     -->
  <!--                       which sendfile will be used. Use a negative    -->
  <!--                       value to always disable sendfile.  [48]        -->
  <!--                                                                      -->
  <!--  For directory listing customization. Checks localXsltFile, then     -->
  <!--  globalXsltFile, then defaults to original behavior.                 -->
  <!--                                                                      -->
  <!--   localXsltFile       Make directory listings an XML doc and         -->
  <!--                       pass the result to this style sheet residing   -->
  <!--                       in that directory. This overrides              -->
  <!--                        globalXsltFile[null]                          -->
  <!--                                                                      -->
  <!--   globalXsltFile      Site wide configuration version of             -->
  <!--                       localXsltFile This argument is expected        -->
  <!--                       to be a physical file. [null]                  -->
  <!--                                                                      -->
  <!--                                                                      -->

    <servlet>
        <servlet-name>default</servlet-name>
        <servlet-class>org.apache.catalina.servlets.DefaultServlet</servlet-class>
        <init-param>
            <param-name>debug</param-name>
            <param-value>0</param-value>
        </init-param>
        <init-param>
            <param-name>listings</param-name>
            <param-value>false</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>


  <!-- The "invoker" servlet, which executes anonymous servlet classes      -->
  <!-- that have not been defined in a web.xml file.  Traditionally, this   -->
  <!-- servlet is mapped to the URL pattern "/servlet/*", but you can map   -->
  <!-- it to other patterns as well.  The extra path info portion of such a -->
  <!-- request must be the fully qualified class name of a Java class that  -->
  <!-- implements Servlet (or extends HttpServlet), or the servlet name     -->
  <!-- of an existing servlet definition.     This servlet supports the     -->
  <!-- following initialization parameters (default values are in square    -->
  <!-- brackets):                                                           -->
  <!--                                                                      -->
  <!--   debug               Debugging detail level for messages logged     -->
  <!--                       by this servlet.  [0]                          -->

<!--
    <servlet>
        <servlet-name>invoker</servlet-name>
        <servlet-class>
          org.apache.catalina.servlets.InvokerServlet
        </servlet-class>
        <init-param>
            <param-name>debug</param-name>
            <param-value>0</param-value>
        </init-param>
        <load-on-startup>2</load-on-startup>
    </servlet>
-->


  <!-- The JSP page compiler and execution servlet, which is the mechanism  -->
  <!-- used by Tomcat to support JSP pages.  Traditionally, this servlet    -->
  <!-- is mapped to the URL pattern "*.jsp".  This servlet supports the     -->
  <!-- following initialization parameters (default values are in square    -->
  <!-- brackets):                                                           -->
  <!--                                                                      -->
  <!--   checkInterval       If development is false and checkInterval is   -->
  <!--                       greater than zero, background compilations are -->
  <!--                       enabled. checkInterval is the time in seconds  -->
  <!--                       between checks to see if a JSP page needs to   -->
  <!--                       be recompiled. [0]                             -->
  <!--                                                                      -->
  <!--   modificationTestInterval                                           -->
  <!--                       Causes a JSP (and its dependent files) to not  -->
  <!--                       be checked for modification during the         -->
  <!--                       specified time interval (in seconds) from the  -->
  <!--                       last time the JSP was checked for              -->
  <!--                       modification. A value of 0 will cause the JSP  -->
  <!--                       to be checked on every access.                 -->
  <!--                       Used in development mode only. [4]             -->
  <!--                                                                      -->
  <!--   compiler            Which compiler Ant should use to compile JSP   -->
  <!--                       pages.  See the Ant documentation for more     -->
  <!--                       information.                                   -->
  <!--                                                                      -->
  <!--   classdebuginfo      Should the class file be compiled with         -->
  <!--                       debugging information?  [true]                 -->
  <!--                                                                      -->
  <!--   classpath           What class path should I use while compiling   -->
  <!--                       generated servlets?  [Created dynamically      -->
  <!--                       based on the current web application]          -->
  <!--                                                                      -->
  <!--   development         Is Jasper used in development mode? If true,   -->
  <!--                       the frequency at which JSPs are checked for    -->
  <!--                       modification may be specified via the          -->
  <!--                       modificationTestInterval parameter. [true]     -->
  <!--                                                                      -->
  <!--   enablePooling       Determines whether tag handler pooling is      -->
  <!--                       enabled  [true]                                -->
  <!--                                                                      -->
  <!--   fork                Tell Ant to fork compiles of JSP pages so that -->
  <!--                       a separate JVM is used for JSP page compiles   -->
  <!--                       from the one Tomcat is running in. [true]      -->
  <!--                                                                      -->
  <!--   ieClassId           The class-id value to be sent to Internet      -->
  <!--                       Explorer when using <jsp:plugin> tags.         -->
  <!--                       [clsid:8AD9C840-044E-11D1-B3E9-00805F499D93]   -->
  <!--                                                                      -->
  <!--   javaEncoding        Java file encoding to use for generating java  -->
  <!--                       source files. [UTF8]                           -->
  <!--                                                                      -->
  <!--   keepgenerated       Should we keep the generated Java source code  -->
  <!--                       for each page instead of deleting it? [true]   -->
  <!--                                                                      -->
  <!--   mappedfile          Should we generate static content with one     -->
  <!--                       print statement per input line, to ease        -->
  <!--                       debugging?  [true]                             -->
  <!--                                                                      -->
  <!--   trimSpaces          Should white spaces in template text between   -->
  <!--                       actions or directives be trimmed?  [false]     -->
  <!--                                                                      -->
  <!--   suppressSmap        Should the generation of SMAP info for JSR45   -->
  <!--                       debugging be suppressed?  [false]              -->
  <!--                                                                      -->
  <!--   dumpSmap            Should the SMAP info for JSR45 debugging be    -->
  <!--                       dumped to a file? [false]                      -->
  <!--                       False if suppressSmap is true                  -->
  <!--                                                                      -->
  <!--   genStrAsCharArray   Should text strings be generated as char       -->
  <!--                       arrays, to improve performance in some cases?  -->
  <!--                       [false]                                        -->
  <!--                                                                      -->
  <!--   errorOnUseBeanInvalidClassAttribute                                -->
  <!--                       Should Jasper issue an error when the value of -->
  <!--                       the class attribute in an useBean action is    -->
  <!--                       not a valid bean class?  [true]                -->
  <!--                                                                      -->
  <!--   scratchdir          What scratch directory should we use when      -->
  <!--                       compiling JSP pages?  [default work directory  -->
  <!--                       for the current web application]               -->
  <!--                                                                      -->
  <!--   xpoweredBy          Determines whether X-Powered-By response       -->
  <!--                       header is added by generated servlet  [false]  -->
  <!--                                                                      -->
  <!--   compilerTargetVM    Compiler target VM                             -->  
  <!--                       default is System.properties                   -->
  <!--                        java.specification.version > 1.4              -->
  <!--                        [1.5] else [1.4]                              -->
  <!--                                                                      -->
  <!--   compilerSourceVM    Compiler source VM                             -->
  <!--                       default is System.properties                   -->
  <!--                        java.specification.version > 1.4              -->
  <!--                        [1.5] else [1.4]                              -->
  <!--                                                                      -->
  <!-- If you wish to use Jikes to compile JSP pages:                       -->
  <!--   Please see the "Using Jikes" section of the Jasper-HowTo           -->
  <!--   page in the Tomcat documentation.                                  -->

    <servlet>
        <servlet-name>jsp</servlet-name>
        <servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class>
        <init-param>
            <param-name>fork</param-name>
            <param-value>false</param-value>
        </init-param>
        <init-param>
            <param-name>xpoweredBy</param-name>
            <param-value>false</param-value>
        </init-param>
        <load-on-startup>3</load-on-startup>
    </servlet>


  <!-- NOTE: An SSI Filter is also available as an alternative SSI          -->
  <!-- implementation. Use either the Servlet or the Filter but NOT both.   -->
  <!--                                                                      -->
  <!-- Server Side Includes processing servlet, which processes SSI         -->
  <!-- directives in HTML pages consistent with similar support in web      -->
  <!-- servers like Apache.  Traditionally, this servlet is mapped to the   -->
  <!-- URL pattern "*.shtml".  This servlet supports the following          -->
  <!-- initialization parameters (default values are in square brackets):   -->
  <!--                                                                      -->
  <!--   buffered            Should output from this servlet be buffered?   -->
  <!--                       (0=false, 1=true)  [0]                         -->
  <!--                                                                      -->
  <!--   debug               Debugging detail level for messages logged     -->
  <!--                       by this servlet.  [0]                          -->
  <!--                                                                      -->
  <!--   expires             The number of seconds before a page with SSI   -->
  <!--                       directives will expire.  [No default]          -->
  <!--                                                                      -->
  <!--   isVirtualWebappRelative                                            -->
  <!--                       Should "virtual" paths be interpreted as       -->
  <!--                       relative to the context root, instead of       -->
  <!--                       the server root?  (0=false, 1=true) [0]        -->
  <!--                                                                      -->
  <!--   inputEncoding       The encoding to assume for SSI resources if    -->
  <!--                       one is not available from the resource.        -->
  <!--                       [Platform default]                             -->
  <!--                                                                      -->
  <!--   outputEncoding      The encoding to use for the page that results  -->
  <!--                       from the SSI processing. [UTF-8]               -->
  <!--                                                                      -->
  <!--                                                                      -->
  <!-- IMPORTANT: To use the SSI servlet, you also need to rename the       -->
  <!--            $CATALINA_HOME/server/lib/servlets-ssi.renametojar file   -->
  <!--            to $CATALINA_HOME/server/lib/servlets-ssi.jar             -->

<!--
    <servlet>
        <servlet-name>ssi</servlet-name>
        <servlet-class>
          org.apache.catalina.ssi.SSIServlet
        </servlet-class>
        <init-param>
          <param-name>buffered</param-name>
          <param-value>1</param-value>
        </init-param>
        <init-param>
          <param-name>debug</param-name>
          <param-value>0</param-value>
        </init-param>
        <init-param>
          <param-name>expires</param-name>
          <param-value>666</param-value>
        </init-param>
        <init-param>
          <param-name>isVirtualWebappRelative</param-name>
          <param-value>0</param-value>