Notes by Dr. Xi
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Created by Dr. Xi on March 13, 2012 08:46:57
Last update: March 13, 2012 08:46:57
This trick sets HTML base to the root context path of the current webapp:
The short version:
<!DOCTYPE html>
<%@ taglib uri="http://java.sun...
The long version:
<!DOCTYPE html>
<%@ taglib uri="http://java.sun...
Created by Dr. Xi on February 24, 2012 12:42:09
Last update: February 24, 2012 12:43:00
Use the copy command to restore a deleted file:
$ svn copy http://svn.example.com/path/to/svn/repo...
@revision must be a revision number before the file was deleted.
You can use the info command to view the info before restoring:
$ svn info http://svn.example.com/path/to/svn/repo...
Created by Dr. Xi on February 23, 2012 14:07:40
Last update: February 23, 2012 14:07:40
The command " svn info " prints information about the current directory:
$ svn info Path: . URL: http://svn.example.c... where: Revision: is the last syncup (update) revision of the current TARGET (artifact/file/directory, whatever you call). This number bumps up to that of the current project revision number after you do an update. Last Changed Rev: is the revision number of the latest change for the current TARGET . If TARGET is a directory, it is the revision number of the latest change within the directory, including all subdirectories. However , this number is not accurate after you do a check in without a following update. The revision number for the file or directory you checked in will have higher revision number than its parent/ancestor. To...
Created by Dr. Xi on February 13, 2012 20:48:56
Last update: February 13, 2012 20:48:56
When you insert an attribute in JSP:
<%@ taglib uri="http://tiles.apache.org/tags-tiles...
you must define the attribute in tiles definitions:
<definition name="/home" template="/WEB-INF/templa...
Otherwise you'll get runtime exception.
The ignore attribute, which defaults to false , will suppress the runtime exception when the attribute is not defined in tiles definition:
<%@ taglib uri="http://tiles.apache.org/tags-tiles...
Created by Dr. Xi on January 17, 2012 11:58:16
Last update: January 17, 2012 11:58:16
Steps to configure JavaMail resource for Tomcat 6 & 7:
Install JavaMail jar: download the JavaMail API , unzip the archive and copy mail.jar to $CATALINA_HOME/lib .
Add JavaMail resource to $CATALINA_BASE/conf/context.xml :
<?xml version="1.0"?>
<Context>
.
...
Add resource-ref for the JavaMail resource to your webapp WEB-INF/web.xml :
<?xml version="1.0" encoding="UTF-8"?>
<web-app...
Use the JavaMail resource in your webapp:
// import javax.naming.*;
// import javax.mail....
Created by Dr. Xi on January 09, 2012 09:13:38
Last update: January 09, 2012 09:14:18
Unlike CVS, svn does not have a tag command, you create a new tag with copy :
$ svn copy http://svn.example.com/repos/calc/trunk...
The -r flag may be used to create a tag from an earlier revision:
-r [--revision] ARG : ARG (some commands al...
Created by Dr. Xi on November 11, 2011 10:05:22
Last update: November 11, 2011 10:12:01
This is an HTML image tag filter using Java regex. It takes a string, finds the img tags, replaces the src attribute with one provided by the filter, then adds a class name to the class attribute.
import java.util.regex.*;
import java.io.*;
...
Test file:
<div id="HTML snippet">
<img src="img/big/txt-m...
Created by Dr. Xi on February 12, 2010 22:52:27
Last update: November 08, 2011 19:48:09
For Tomcat 6, there's no default manager username and password. You do have to set it up yourself, though it's pretty straightforward. The Tomcat manager webapp is restricted to users with a role named manager . So you'll need to create a user and assign the manager role to it.
Edit $CATALINA_BASE/conf/tomcat-users.xml to read:
<?xml version='1.0' encoding='utf-8'?>
<!--
...
For tomcat 7:
<tomcat-users>
<role rolename="manager"/>
...
Created by Dr. Xi on September 30, 2011 15:34:47
Last update: September 30, 2011 15:34:47
A naive try would be something like this:
$ nc -l 8082 | nc remote_host 80 Yes, it does forward the request from local port 8082 to remote_host:80 , but the response is dumped to stdout , not routed back to the client as expected. Using a named pipe makes it work: $ mkfifo backpipe $ nc -l 8082 0<backpipe | nc ... Use tee to get a glimpse of the response through the pipe (I wasn't able to find a way to dump the request): $ nc -k -l 8082 0<backpipe | nc localhost 80 | tee... The GNU netcat has a different syntax than the stock nc . It also supports different switches. To listen to port 1234: $ netcat -l -p 1234...
Created by Dr. Xi on August 11, 2007 15:56:47
Last update: July 19, 2011 08:15:55
Here's a list of common TCP ports. You can find a more complete list here: http://www.gasmi.net/docs/tcp.html . Port Number Service Description 21 FTP File Transfer Protocol 22 SSH Secure Shell 23 Telnet Telnet remote login 25 SMTP Simple Mail Transfer Protocol 70 gopher Gopher 79 finger Finger 80 HTTP Hyper Text Transfer Protocol (WWW) 88 Kerberos Kerberos authentication 94 tivoli Tivoli Object Dispatcher 110 pop3 Post Office Protocol Version 3 123 ntp Network Time Protocol 137 netbios NetBIOS Name Service 138 netbios NetBIOS Datagram 139 netbios NetBIOS Session 143 imap Internet Message Access Protocol 161 snmp Simple Network Management Protocol 162 snmptrap SNMP trap 194 irc Internet Relay Chat Protocol 389 ldap Lightweight Directory Access Protocol 443 https Secure HTTP 445 SMB MS Server Message...
