安装jstl中的web.xml配置问题

来源：互联网发布：中国汽车产销量数据编辑：程序博客网时间：2024/04/30 09:47

到http://apache.towardex.com/jakarta/taglibs/standard/下载了最新的jstl，然后把standard.jar和jstl.jar文件拷贝到/WEB-INF/lib/下，/tld/下的8个tld类型文件拷到"/WEB-INF/"下。

接下来配置web.xml文件，这里我就有些糊涂了。

下面这个是《jsp设计》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>

<context-param>
    <param-name>
      javax.servlet.jsp.jstl.fmt.fallbackLocale
    </param-name>
    <param-value>
      en
    </param-value>
</context-param>

<context-param>
    <param-name>
      javax.servlet.jsp.jstl.sql.dataSource
    </param-name>
    <param-value>
      jdbc:mysql:///test,org.gjt.mm.mysql.Driver
    </param-value>
</context-param>

<context-param>
    <param-name>driverClass</param-name>
    <param-value>
      org.gjt.mm.mysql.Driver
    </param-value>
</context-param>

<context-param>
    <param-name>jdbcURL</param-name>
    <param-value>
      jdbc:mysql:///test
    </param-value>
</context-param>

<filter>
    <filter-name>accessControl</filter-name>
    <filter-class>
      com.ora.jsp.servlets.AccessControlFilter
    </filter-class>
    <init-param>
      <param-name>loginPage</param-name>
      <param-value>/ch18/login.jsp</param-value>
    </init-param>
</filter>

<filter-mapping>
<filter-name>accessControl</filter-name>
<url-pattern>/ch18/protected/*</url-pattern>
</filter-mapping>

<listener>
    <listener-class>
      com.ora.jsp.servlets.ResourceManagerListener
    </listener-class>
</listener>

<listener>
    <listener-class>
      com.ora.jsp.servlets.SessionCounterListener
    </listener-class>
</listener>

<servlet>
<servlet-name>jspSource</servlet-name>
<servlet-class>JSPSourceServlet</servlet-class>
</servlet>

<servlet>
    <servlet-name>errorDispatcher</servlet-name>
    <servlet-class>com.ora.jsp.servlets.ErrorDispatcherServlet</servlet-class>
    <init-param>
      <param-name>errorPage</param-name>
      <param-value>/ch9/errorpage.jsp?debug=resp</param-value>
    </init-param>
</servlet>

<servlet>
    <servlet-name>action</servlet-name>
    <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
<servlet-name>jspSource</servlet-name>
<url-pattern>/jspSource/*</url-pattern>
</servlet-mapping>

<servlet-mapping>
<servlet-name>errorDispatcher</servlet-name>
<url-pattern>/errorDispatcher</url-pattern>
</servlet-mapping>

<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>

<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>

<!--
Uncomment if you want all exceptions and 500 status codes to
be handled by the customized error page.
<error-page>
<exception-type>java.lang.Throwable</exception-type>
<location>/errorDispatcher</location>
</error-page>

<error-page>
<error-code>500</error-code>
<location>/errorDispatcher</location>
</error-page>
-->

<resource-ref>
    <description>
      JNDI DataSource for example database
    </description>
    <res-ref-name>jdbc/Example</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
    <res-sharing-scope>Sharable</res-sharing-scope>
</resource-ref>

<security-constraint>
    <web-resource-collection>
      <web-resource-name>admin</web-resource-name>
      <url-pattern>/ch12/admin/*</url-pattern>
      <url-pattern>/ch12/search/delete.jsp</url-pattern>
    </web-resource-collection>
    <auth-constraint>
      <role-name>admin</role-name>
    </auth-constraint>
</security-constraint>

<security-constraint>
    <web-resource-collection>
      <web-resource-name>search</web-resource-name>
      <url-pattern>/ch12/search/*</url-pattern>
    </web-resource-collection>
    <auth-constraint>
      <role-name>admin</role-name>
      <role-name>user</role-name>
    </auth-constraint>
</security-constraint>

<login-config>
<auth-method>BASIC</auth-method>
<realm-name>ORA Examples</realm-name>
</login-config>

<security-role>
<role-name>admin</role-name>
</security-role>
<security-role>
<role-name>user</role-name>
</security-role>

</web-app>
另外在网上找到了一个家伙写的web.xml

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

<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">
   <taglib>
      <taglib-uri>http://java.sun.com/jstl/fmt</taglib-uri>
      <taglib-location>/WEB-INF/fmt.tld</taglib-location>
</taglib>

<taglib>
      <taglib-uri>http://java.sun.com/jstl/fmt-rt</taglib-uri>
      <taglib-location>/WEB-INF/fmt-rt.tld</taglib-location>
</taglib>

<taglib>
      <taglib-uri>http://java.sun.com/jstl/core</taglib-uri>
      <taglib-location>/WEB-INF/c.tld</taglib-location>
</taglib>

<taglib>
      <taglib-uri>http://java.sun.com/jstl/core-rt</taglib-uri>
      <taglib-location>/WEB-INF/c-rt.tld</taglib-location>
</taglib>

<taglib>
      <taglib-uri>http://java.sun.com/jstl/sql</taglib-uri>
      <taglib-location>/WEB-INF/sql.tld</taglib-location>
</taglib>

<taglib>
      <taglib-uri>http://java.sun.com/jstl/sql-rt</taglib-uri>
      <taglib-location>/WEB-INF/sql-rt.tld</taglib-location>
</taglib>

<taglib>
      <taglib-uri>http://java.sun.com/jstl/x</taglib-uri>
      <taglib-location>/WEB-INF/x.tld</taglib-location>
</taglib>

<taglib>
      <taglib-uri>http://java.sun.com/jstl/x-rt</taglib-uri>
      <taglib-location>/WEB-INF/x-rt.tld</taglib-location>
</taglib>

    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
<welcome-file>
            index.jsp
        </welcome-file>
    </welcome-file-list>
</web-app>
两个都可以使用，我有些糊涂了，究竟在web.xml 中到底是要申明些什么，起到什么作用呢？

知道的请告诉我，谢谢！