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| - | In this tutorial, we will show how to use Resin's CGIServlet.
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| - | The <b>CGI (Common Gateway Interface)</b>, is a protocol for calling external software via a web server to deliver dynamic content.Resin enables this protocol through it's <b>CGIServlet</b>.
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| - | == CGIServlet ==
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| - | Implements CGI calls. The url is assumed to refer to an executable file. The operating system is instructed to execute the program or script. The usual CGI environment variables are set, and the current directory is the value of $RESIN_HOME
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| - | In our code example, we will demonstrate how to execute a shell script, Python script, Ruby script and a Perl script.
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| - | <source lang="java">
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| - | <?xml version = '1.0' encoding = 'UTF-8'?>
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| - | <web-app>
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| - | <description>CGI scripts</description>
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| - | <servlet>
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| - | <servlet-name>cgi</servlet-name>
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| - | <servlet-class>com.caucho.servlets.CGIServlet</servlet-class>
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| - | </servlet>
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| - | <servlet-mapping>
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| - | <servlet-name>cgi</servlet-name>
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| - | <url-pattern>/cgi-bin/*.sh</url-pattern>
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| - | <url-pattern>/cgi-bin/*.py</url-pattern>
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| - | <url-pattern>/cgi-bin/*.rb</url-pattern>
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| - | <url-pattern>/cgi-bin/*.pl</url-pattern>
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| - | </servlet-mapping>
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| - | <welcome-file-list>
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| - | <welcome-file>index.html</welcome-file>
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| - | </welcome-file-list>
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| - | </web-app>
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| - | </source>
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| - | This is the <b>web.xml</b> file. Here we map all urls with .sh, .py, .rb and .pl extensions to the CGIServlet. Traditionally, the cgi scripts are placed in a directory called <b>cgi-bin</b>.
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| - | <source lang="java">
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| - | <html>
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| - | <head>
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| - | <title>CGI scripts</title>
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| - | </head>
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| - | <body>
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| - | <pre>
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| - | Execute:
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| - | <a href="http://localhost:8080/webapp/cgi-bin/script.sh">shell script</a>
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| - | <a href="http://localhost:8080/webapp/cgi-bin/script.py">Python script</a>
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| - | <a href="http://localhost:8080/webapp/cgi-bin/script.rb">Ruby script</a>
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| - | <a href="http://localhost:8080/webapp/cgi-bin/script.pl">Perl script</a>
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| - | </pre>
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| - | </body>
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| - | </html>
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| - | </source>
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| - | This is the index.jsp page. Here we have four links to four different cgi scripts.
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| - | <source lang="java">
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| - | $ ls *
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| - | index.html
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| - | cgi-bin:
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| - | script.pl script.py script.rb script.sh
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| - | META-INF:
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| - | resin-war.digest
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| - | WEB-INF:
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| - | classes tmp web.xml
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| - | </source>
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| - | This is how the directory structure looks like. Note the cgi-bin directory.
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| - | == Scripts ==
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| - | Next we will show all four CGI scripts. They all print environment variables.
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| - | <source lang="java">
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| - | #!/bin/sh
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| - | echo "Content-Type: text/html"
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| - | echo
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| - | echo "<pre>"
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| - | env
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| - | echo "</pre>"
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| - | </source>
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| - | This is the shell CGI script.
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| - | <source lang="java">
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| - | #!/usr/bin/python
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| - | import sys
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| - | import os
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| - | from cgi import escape
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| - | print "Content-type: text/html"
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| - | print
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| - | print "<pre>"
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| - | for k in sorted(os.environ):
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| - | print "<b>%s: </b>%s" %(escape(k), escape(os.environ[k]))
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| - | print "</pre>"
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| - | </source>
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| - | This is the Python CGI script.
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| - | <source lang="java">
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| - | #!/usr/bin/ruby
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| - | puts "Content-Type: text/html"
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| - | puts
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| - | puts "<pre>"
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| - | ENV.to_hash.each do |key, value|
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| - | puts("<b>#{key}</b>: #{value}")
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| - | end
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| - | puts "</pre>"
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| - | </source>
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| - | This is the Ruby CGI script.
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| - | <source lang="java">
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| - | #!/usr/bin/perl
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| - | print "Content-type: text/html\n\n";
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| - | print "<pre>";
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| - | foreach $key (sort keys(%ENV)) {
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| - | print "<b>$key</b>: $ENV{$key}";
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| - | print "<br>";
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| - | }
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| - | print "</pre>";
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| - | </source>
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| - | Finally, this is the Perl CGI script.
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| - | [[image: java_ee_faq_cgiservlet.png| center]]
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| - | [[Категория:Java]]
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