tomcat原理（三）结合公司tomcat的用法的在理解

一，server.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<Server port="8006" shutdown="SHUTDOWN">
  <Listener className="org.apache.catalina.startup.VersionLoggerListener"/>
  <Listener SSLEngine="on" className="org.apache.catalina.core.AprLifecycleListener"/>
  <Listener className="org.apache.catalina.core.JasperListener"/>
  <Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener"/>
  <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"/>
  <Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener"/>
  <GlobalNamingResources>
    <Resource auth="Container" description="User database that can be updated and saved" factory="org.apache.catalina.users.MemoryUserDatabaseFactory" name="UserDatabase" pathname="conf/tomcat-users.xml" type="org.apache.catalina.UserDatabase"/>
  </GlobalNamingResources>
  <Service name="Catalina">
    <Connector connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443"/>
    <Connector port="8009" protocol="AJP/1.3" redirectPort="8443"/>
    <Engine defaultHost="localhost" name="Catalina">
      <Realm className="org.apache.catalina.realm.LockOutRealm">
        <Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase"/>
      </Realm>
      <Host appBase="webapps" autoDeploy="true" name="localhost" unpackWARs="true">
        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs" pattern="%h %l %u %t &quot;%r&quot; %s %b" prefix="localhost_access_log." suffix=".txt"/>
      <Context docBase="D:\workspace\app-lisi\wangwu\src\main\webapp" path="/wangwu" reloadable="true"/></Host>
    </Engine>
  </Service>
</Server>

localhost：8080就是服务器的配置好的。具体怎么改加tomacat（一）的说明。

其中我们可以看到D:\workspace\app-lisi\wangwu\src\main\webapp这个路径，现在假如浏览器来访问的时候会设置一个虚拟路径而这个虚拟路径就是path="/wangwu"，到时候假如我们访问的是

localhost：8080/wangwu/1.jsp就相当于访问的是 localhost：8080/D:\workspace\app-lisi\wangwu\src\main\webapp\1.jsp

二，web.xml的注意点

context.xml文件

 <Context>

     <WatchedResource>WEB-INF/web.xml</WatchedResource>
 </Context>

从context.xml中我们可以看到，tomcat会默认首先去加载项目下的web.xml的文件

假如在我们现在是新建的项目，就可以把tomacat下的web.xml文件直接复制到自己的项目的WEB-INF的目录下就行了。

在这里需要注意的就是tomcat的web.xml问价的抬头和项目的web.xml的抬头不一定非得一样。

这是我用的tomcat的web.xml的内容

 <?xml version="1.0" encoding="ISO-8859-1"?>
 <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"
   metadata-complete="true">

   <display-name>Welcome to Tomcat</display-name>
   <description>
      Welcome to Tomcat
   </description>
 </web-app>

这是我项目中的web.xml的内容

 <?xml version="1.0" encoding="UTF-8"?>
 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
     xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
     version="2.4">
     <context-param>
         <param-name>webAppRootKey</param-name>
         <param-value>bossintra.root</param-value>
     </context-param>

     <context-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>
             classpath:context/init/applicationService.xml
         </param-value>
     </context-param>

     <!-- 读取spring配置的listener -->
     <listener>
         <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
     </listener>

     <filter>
         <filter-name>sitemesh</filter-name>
         <filter-class>com.opensymphony.module.sitemesh.filter.PageFilter</filter-class>
     </filter>
     <filter-mapping>
         <filter-name>sitemesh</filter-name>
         <url-pattern>*.htm</url-pattern>
     </filter-mapping>
     <filter-mapping>
         <filter-name>sitemesh</filter-name>
         <url-pattern>*.ftl</url-pattern>
     </filter-mapping>
     <!-- 处理中文字符编码的过滤器配置 -->
     <filter>
         <filter-name>Set Character Encoding</filter-name>
         <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
         <init-param>
             <param-name>encoding</param-name>
             <param-value>UTF-8</param-value>
         </init-param>
         <init-param>
             <param-name>forceEncoding</param-name>
             <param-value>true</param-value>
         </init-param>
     </filter>
     <filter-mapping>
         <filter-name>Set Character Encoding</filter-name>
         <url-pattern>/*</url-pattern>
     </filter-mapping>

     <!-- 装饰时的过滤sitemesh针对freemarker的支持 -->
     <servlet>
         <servlet-name>sitemesh-freemarker</servlet-name>
         <servlet-class>
             com.opensymphony.module.sitemesh.freemarker.FreemarkerDecoratorServlet
         </servlet-class>
         <init-param>
             <param-name>TemplatePath</param-name>
             <param-value>/</param-value>
         </init-param>
         <init-param>
             <param-name>default_encoding</param-name>
             <param-value>UTF-8</param-value>
         </init-param>
         <load-on-startup>1</load-on-startup>
     </servlet>

     <servlet-mapping>
         <servlet-name>sitemesh-freemarker</servlet-name>
         <url-pattern>*.ftl</url-pattern>
     </servlet-mapping>

     <servlet>
         <servlet-name>seashell</servlet-name>
         <servlet-class>
             org.springframework.web.servlet.DispatcherServlet
         </servlet-class>
         <init-param>
             <param-name>contextConfigLocation</param-name>
             <param-value>
                 classpath:context/init/applicationContext.xml
             </param-value>
         </init-param>
         <load-on-startup>3</load-on-startup>
     </servlet>

     <!--spring controller对应的扩展名-->
     <servlet-mapping>
         <servlet-name>seashell</servlet-name>
         <url-pattern>*.htm</url-pattern>
     </servlet-mapping>
     <servlet-mapping>
         <servlet-name>seashell</servlet-name>
         <url-pattern>*.do</url-pattern>
     </servlet-mapping>

     <jsp-config>

          <taglib>
             <taglib-uri>sitemesh-decorator</taglib-uri>
             <taglib-location>
                 /WEB-INF/tld/sitemesh-decorator.tld
             </taglib-location>
         </taglib>

         <taglib>
             <taglib-uri>sitemesh-page</taglib-uri>
             <taglib-location>
                 /WEB-INF/tld/sitemesh-page.tld
             </taglib-location>
         </taglib>

         <taglib>
             <taglib-uri>/WEB-INF/spring.tld</taglib-uri>
             <taglib-location>/WEB-INF/tld/spring.tld</taglib-location>
         </taglib>

         <taglib>
             <taglib-uri>/WEB-INF/spring-form.tld</taglib-uri>
             <taglib-location>
                 /WEB-INF/tld/spring-form.tld
             </taglib-location>
         </taglib>
     <taglib>
             <taglib-uri>/WEB-INF/tld/page.tld</taglib-uri>
             <taglib-location>
                 /WEB-INF/tld/page.tld
             </taglib-location>
         </taglib>
     </jsp-config>
 <distributable />
 </web-app>