DefaultServlet是tomcat中用来处理静态资源和提供目录列表directory listings(如果服务开启的话)服务的Servlet。它处理所有没有被其他Servlet处理的资源请求。
在tomcat下$CATALINA_BASE/conf/web.xml中定义:
默认情况下,DefaultServlet是在webapp启动的时候被加载并且directory listings是开启的,debugging是关闭的
关键属性:
listings:如果没有welcome file的话,directory listing是否显示 可能的值true,false
globalXsltFile,contextXsltFile,localXsltFile:定制directory listing的样式
readonly:默认true,就会拒绝HTTP PUT, DELETE命令
- <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>true</param-value>
- </init-param>
- <load-on-startup>1</load-on-startup>
- </servlet>
- <servlet-mapping>
- <servlet-name>default</servlet-name>
- <url-pattern>/</url-pattern>
- </servlet-mapping>
<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>true</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> ... <servlet-mapping> <servlet-name>default</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping>
默认情况下,DefaultServlet是映射到根目录的,也可以如下修改成只映射到根目录下static子目录,那么对于其他目录的访问,就会被拒绝!
- <servlet-mapping>
- <servlet-name>default</servlet-name>
- <url-pattern>/static/*</url-pattern>
- </servlet-mapping>
<servlet-mapping> <servlet-name>default</servlet-name> <url-pattern>/static/*</url-pattern> </servlet-mapping>
Apache Tomcat 6.0 Default Servlet Reference
Apache:
默认情况下,在httpd.conf中定义了工作目录DocumentRoot,这个是Apache用来对外提供服务的地方,除了被aliases和symbolic links中处理并重定向到其他地方的请求外,其他所有资源请求都是从这个目录来提取的。
JkMount 告诉apache如何判断用户的请求哪些该发往tomcat,这里有一个匹配则,apache优先匹配静态资源,一旦静态匹配不成功,再来检查这里的文件,满足就转发给tomcat?注意的是,需要把Apache的DocumentRoot和Tomcat下的docBase指定到同一个地方,或者把tomcat下静态资源部分复制到Apache的DocumentRoot下(即存在2份相同的文件)才能达到这个效果!
- Include conf.self/*.conf
Include conf.self/*.conf
httpd -version
apache和tomcat 默认的404页面是不一样的
tomcat的404页面:
- HTTP Status 404 - /12
- type Status report
- message /12
- description The requested resource (/12) is not available.
- Apache Tomcat/6.0.28
HTTP Status 404 - /12 type Status report message /12 description The requested resource (/12) is not available. Apache Tomcat/6.0.28
apache的404页面:
- <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
- <html><head>
- <title>404 Not Found</title>
- </head><body>
- <h1>Not Found</h1>
- <p>The requested URL /test/a.html was not found on this server.</p>
- <hr>
- <address>Apache/2.2.3 (CentOS) Server at www.test.com Port 80</address>
- </body></html>
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <html><head> <title>404 Not Found</title> </head><body> <h1>Not Found</h1> <p>The requested URL /test/a.html was not found on this server.</p> <hr> <address>Apache/2.2.3 (CentOS) Server at www.test.com Port 80</address> </body></html>