| [66] | 1 | <html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Apache Tomcat 6.0 - Default Servlet Reference</title><meta value="Tim Funk" name="author"><meta value="funkman@apache.org" name="email"></head><body vlink="#525D76" alink="#525D76" link="#525D76" text="#000000" bgcolor="#ffffff"><table cellspacing="0" width="100%" border="0"><!--PAGE HEADER--><tr><td><!--PROJECT LOGO--><a href="http://tomcat.apache.org/"><img border="0" alt=" |
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| 2 | The Apache Tomcat Servlet/JSP Container |
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| 3 | " align="right" src="./../images/tomcat.gif"></a></td><td><font face="arial,helvetica,sanserif"><h1>Apache Tomcat 6.0</h1></font></td><td><!--APACHE LOGO--><a href="http://www.apache.org/"><img border="0" alt="Apache Logo" align="right" src="./../images/asf-logo.gif"></a></td></tr></table><table cellspacing="4" width="100%" border="0"><!--HEADER SEPARATOR--><tr><td colspan="2"><hr size="1" noshade></td></tr><tr><!--RIGHT SIDE MAIN BODY--><td align="left" valign="top" width="80%"><table cellspacing="4" width="100%" border="0"><tr><td valign="top" align="left"><h1>Apache Tomcat 6.0</h1><h2>Default Servlet Reference</h2></td><td nowrap="true" valign="top" align="right"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Introduction"><strong>Introduction</strong></a></font></td></tr><tr><td><blockquote> |
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| 4 | |
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| 5 | This discusses different ways to manipulate the default servlet. Topics are |
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| 6 | <ul> |
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| 7 | <li><a href="#what">What is the DefaultServlet?</a></li> |
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| 8 | <li><a href="#where">Where is it declared?</a></li> |
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| 9 | <li><a href="#change">What can I change?</a></li> |
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| 10 | <li><a href="#dir">How do I customize directory listings?</a></li> |
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| 11 | <li><a href="#secure">How do I secure directory listings?</a></li> |
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| 12 | |
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| 13 | </ul> |
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| 14 | |
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| 15 | </blockquote></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="What is the DefaultServlet"><strong>What is the DefaultServlet</strong></a></font></td></tr><tr><td><blockquote> |
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| 16 | <a name="what"></a> |
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| 17 | The default servlet is the servlet which serves static resources as well |
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| 18 | as serves the directory listings (if directory listings are enabled). |
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| 19 | |
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| 20 | </blockquote></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Where is it declared?"><strong>Where is it declared?</strong></a></font></td></tr><tr><td><blockquote> |
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| 21 | <a name="where"></a> |
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| 22 | It is declared globally in <i>$CATALINA_BASE/conf/web.xml</i>. |
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| 23 | By default here is it's declaration: |
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| 24 | <div align="left"><table border="0" cellpadding="0" cellspacing="4"><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td></tr><tr><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td><td height="1" bgcolor="#ffffff"><pre> |
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| 25 | <servlet> |
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| 26 | <servlet-name>default</servlet-name> |
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| 27 | <servlet-class> |
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| 28 | org.apache.catalina.servlets.DefaultServlet |
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| 29 | </servlet-class> |
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| 30 | <init-param> |
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| 31 | <param-name>debug</param-name> |
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| 32 | <param-value>0</param-value> |
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| 33 | </init-param> |
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| 34 | <init-param> |
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| 35 | <param-name>listings</param-name> |
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| 36 | <param-value>true</param-value> |
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| 37 | </init-param> |
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| 38 | <load-on-startup>1</load-on-startup> |
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| 39 | </servlet> |
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| 40 | |
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| 41 | ... |
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| 42 | |
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| 43 | <servlet-mapping> |
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| 44 | <servlet-name>default</servlet-name> |
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| 45 | <url-pattern>/</url-pattern> |
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| 46 | </servlet-mapping> |
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| 47 | |
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| 48 | </pre></td><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td></tr><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td></tr></table></div> |
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| 49 | |
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| 50 | So by default, the default servlet is loaded at webapp startup and |
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| 51 | directory listings are enabled and debugging is turned off. |
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| 52 | </blockquote></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="What can I change?"><strong>What can I change?</strong></a></font></td></tr><tr><td><blockquote> |
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| 53 | <a name="change"></a> |
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| 54 | The DefaultServlet allows the following initParamters: |
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| 55 | |
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| 56 | <table border="1"> |
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| 57 | <tr> |
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| 58 | <th valign="top">debug</th> |
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| 59 | <td valign="top"> |
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| 60 | Debugging level. It is not very useful unless you are a tomcat |
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| 61 | developer. As |
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| 62 | of this writing, useful values are 0, 1, 11, 1000. |
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| 63 | </td> |
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| 64 | </tr> |
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| 65 | <tr> |
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| 66 | <th valign="top">listings</th> |
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| 67 | <td valign="top"> |
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| 68 | If no welcome file is present, can a directory listing be |
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| 69 | shown? |
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| 70 | value may be <b>true</b> or <b>false</b> |
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| 71 | <br> |
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| 72 | Welcome files are part of the servlet api. |
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| 73 | <br> |
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| 74 | <b>WARNING:</b> Listings of directories containing many entries are |
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| 75 | expensive. Multiple requests for large directory listings can consume |
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| 76 | significant proportions of server resources. |
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| 77 | </td> |
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| 78 | </tr> |
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| 79 | <tr> |
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| 80 | <th valign="top">readmeFile</th> |
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| 81 | <td valign="top"> |
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| 82 | If a directory listing is presented, a readme file may also |
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| 83 | be presented with the listing. This file is inserted as is |
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| 84 | so it may contain HTML. default value is null |
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| 85 | </td> |
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| 86 | </tr> |
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| 87 | <tr> |
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| 88 | <th valign="top">globalXsltFile</th> |
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| 89 | <td valign="top"> |
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| 90 | If you wish to customize your directory listing, you |
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| 91 | can use an XSL transformation. This value is an absolute |
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| 92 | file name which be used for all direcotory listings. |
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| 93 | This can be disabled by per webapp by also declaring the |
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| 94 | default servlet in your local webapp's web.xml. The format |
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| 95 | of the xml is shown below. |
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| 96 | </td> |
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| 97 | </tr> |
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| 98 | <tr> |
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| 99 | <th valign="top">localXsltFile</th> |
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| 100 | <td valign="top"> |
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| 101 | You may also customize your directory listing by directory by |
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| 102 | configuring <code>localXsltFile</code>. This should be a relative |
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| 103 | file name in the directory where the listing will take place. |
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| 104 | This overrides <code>globalXsltFile</code>. If this value |
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| 105 | is present but a file does not exist, then |
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| 106 | <code>globalXsltFile</code> will be used. If |
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| 107 | <code>globalXsltFile</code> does not exist, then the default |
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| 108 | directory listing will be shown. |
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| 109 | </td> |
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| 110 | </tr> |
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| 111 | <tr> |
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| 112 | <th valign="top">input</th> |
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| 113 | <td valign="top"> |
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| 114 | Input buffer size (in bytes) when reading |
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| 115 | resources to be served. [2048] |
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| 116 | </td> |
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| 117 | </tr> |
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| 118 | <tr> |
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| 119 | <th valign="top">output</th> |
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| 120 | <td valign="top"> |
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| 121 | Output buffer size (in bytes) when writing |
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| 122 | resources to be served. [2048] |
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| 123 | </td> |
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| 124 | </tr> |
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| 125 | <tr> |
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| 126 | <th valign="top">readonly</th> |
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| 127 | <td valign="top"> |
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| 128 | Is this context "read only", so HTTP commands like PUT and |
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| 129 | DELETE are rejected? [true] |
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| 130 | </td> |
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| 131 | </tr> |
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| 132 | <tr> |
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| 133 | <th valign="top">fileEncoding</th> |
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| 134 | <td valign="top"> |
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| 135 | File encoding to be used when reading static resources. |
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| 136 | [platform default] |
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| 137 | </td> |
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| 138 | </tr> |
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| 139 | <tr> |
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| 140 | <th valign="top">sendfileSize</th> |
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| 141 | <td valign="top"> |
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| 142 | If the connector used supports sendfile, this represents the minimal |
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| 143 | file size in KB for which sendfile will be used. Use a negative value |
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| 144 | to always disable sendfile. [48] |
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| 145 | </td> |
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| 146 | </tr> |
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| 147 | |
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| 148 | </table> |
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| 149 | </blockquote></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="How do I customize directory listings?"><strong>How do I customize directory listings?</strong></a></font></td></tr><tr><td><blockquote> |
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| 150 | <a name="dir"></a> |
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| 151 | <p>You can override DefaultServlet with you own implementation and use that |
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| 152 | in your web.xml declaration. If you |
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| 153 | can undertand what was just said, we will assume yo can read the code |
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| 154 | to DefaultServlet servlet and make the appropriate adjustments. (If not, |
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| 155 | then that method isn't for you) |
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| 156 | </p> |
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| 157 | <p> |
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| 158 | You can use either <code>localXsltFile</code> or |
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| 159 | <code>globalXsltFile</code> and DefaultServlet will create |
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| 160 | an xml document and run it through an xsl transformation based |
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| 161 | on the values provided in <code>localXsltFile</code> and |
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| 162 | <code>globalXsltFile</code>. <code>localXsltFile</code> is first |
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| 163 | checked, followed by <code>globalXsltFile</code>, then default |
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| 164 | behaviors takes place. |
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| 165 | </p> |
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| 166 | |
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| 167 | <p> |
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| 168 | Format: |
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| 169 | <div align="left"><table border="0" cellpadding="0" cellspacing="4"><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td></tr><tr><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td><td height="1" bgcolor="#ffffff"><pre> |
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| 170 | <listing> |
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| 171 | <entries> |
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| 172 | <entry type='file|dir' urlPath='aPath' size='###' date='gmt date'> |
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| 173 | fileName1 |
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| 174 | </entry> |
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| 175 | <entry type='file|dir' urlPath='aPath' size='###' date='gmt date'> |
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| 176 | fileName2 |
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| 177 | </entry> |
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| 178 | ... |
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| 179 | </entries> |
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| 180 | <readme></readme> |
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| 181 | </listing> |
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| 182 | </pre></td><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td></tr><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td></tr></table></div> |
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| 183 | <ul> |
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| 184 | <li>size will be missing if <code>type='dir'</code></li> |
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| 185 | <li>Readme is a CDATA entry</li> |
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| 186 | </ul> |
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| 187 | </p> |
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| 188 | The following is a sample xsl file which mimics the default tomcat behavior: |
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| 189 | <div align="left"><table border="0" cellpadding="0" cellspacing="4"><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td></tr><tr><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td><td height="1" bgcolor="#ffffff"><pre> |
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| 190 | <?xml version="1.0"?> |
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| 191 | |
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| 192 | <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" |
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| 193 | version="1.0"> |
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| 194 | |
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| 195 | <xsl:output method="xhtml" encoding="iso-8859-1" indent="no"/> |
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| 196 | |
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| 197 | <xsl:template match="listing"> |
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| 198 | <html> |
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| 199 | <head> |
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| 200 | <title> |
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| 201 | Sample Directory Listing For |
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| 202 | <xsl:value-of select="@directory"/> |
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| 203 | </title> |
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| 204 | <style> |
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| 205 | h1{color : white;background-color : #0086b2;} |
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| 206 | h3{color : white;background-color : #0086b2;} |
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| 207 | body{font-family : sans-serif,Arial,Tahoma; |
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| 208 | color : black;background-color : white;} |
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| 209 | b{color : white;background-color : #0086b2;} |
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| 210 | a{color : black;} HR{color : #0086b2;} |
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| 211 | </style> |
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| 212 | </head> |
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| 213 | <body> |
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| 214 | <h1>Sample Directory Listing For |
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| 215 | <xsl:value-of select="@directory"/> |
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| 216 | </h1> |
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| 217 | <hr size="1" /> |
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| 218 | <table cellspacing="0" |
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| 219 | width="100%" |
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| 220 | cellpadding="5" |
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| 221 | align="center"> |
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| 222 | <tr> |
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| 223 | <th align="left">Filename</th> |
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| 224 | <th align="center">Size</th> |
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| 225 | <th align="right">Last Modified</th> |
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| 226 | </tr> |
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| 227 | <xsl:apply-templates select="entries"/> |
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| 228 | </table> |
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| 229 | <xsl:apply-templates select="readme"/> |
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| 230 | <hr size="1" /> |
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| 231 | <h3>Apache Tomcat/6.0</h3> |
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| 232 | </body> |
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| 233 | </html> |
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| 234 | </xsl:template> |
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| 235 | |
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| 236 | |
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| 237 | <xsl:template match="entries"> |
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| 238 | <xsl:apply-templates select="entry"/> |
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| 239 | </xsl:template> |
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| 240 | |
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| 241 | <xsl:template match="readme"> |
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| 242 | <hr size="1" /> |
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| 243 | <pre><xsl:apply-templates/></pre> |
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| 244 | </xsl:template> |
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| 245 | |
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| 246 | <xsl:template match="entry"> |
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| 247 | <tr> |
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| 248 | <td align="left"> |
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| 249 | <xsl:variable name="urlPath" select="@urlPath"/> |
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| 250 | <a href="{$urlPath}"> |
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| 251 | <tt><xsl:apply-templates/></tt> |
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| 252 | </a> |
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| 253 | </td> |
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| 254 | <td align="right"> |
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| 255 | <tt><xsl:value-of select="@size"/></tt> |
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| 256 | </td> |
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| 257 | <td align="right"> |
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| 258 | <tt><xsl:value-of select="@date"/></tt> |
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| 259 | </td> |
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| 260 | </tr> |
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| 261 | </xsl:template> |
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| 262 | |
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| 263 | </xsl:stylesheet> |
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| 264 | </pre></td><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td></tr><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></td></tr></table></div> |
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| 265 | |
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| 266 | </blockquote></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="How do I secure directory listings?"><strong>How do I secure directory listings?</strong></a></font></td></tr><tr><td><blockquote> |
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| 267 | <a name="secure"></a> |
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| 268 | Use web.xml in each individual webapp. See the security section of the |
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| 269 | Servlet specification. |
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| 270 | |
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| 271 | </blockquote></td></tr></table></td></tr><!--FOOTER SEPARATOR--><tr><td colspan="2"><hr size="1" noshade></td></tr><!--PAGE FOOTER--><tr><td colspan="2"><div align="center"><font size="-1" color="#525D76"><em> |
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| 272 | Copyright © 1999-2008, Apache Software Foundation |
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| 273 | </em></font></div></td></tr></table></body></html> |
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