Windows Hard Drive Serial Number

public static String getSerialNumber(String drive) {
String result = "";
try {
File file = File.createTempFile("realhowto",".vbs");
file.deleteOnExit();
FileWriter fw = new java.io.FileWriter(file);

String vbs = "Set objFSO = CreateObject(\"Scripting.FileSystemObject\")\n"
+"Set colDrives = objFSO.Drives\n"
+"Set objDrive = colDrives.item(\"" + drive + "\")\n"
+"Wscript.Echo objDrive.SerialNumber"; // see note
fw.write(vbs);
fw.close();
Process p = Runtime.getRuntime().exec("cscript //NoLogo " + file.getPath());
BufferedReader input =
new BufferedReader
(new InputStreamReader(p.getInputStream()));
String line;
while ((line = input.readLine()) != null) {
result += line;
}
input.close();
}
catch(Exception e){
e.printStackTrace();
}
return result.trim();
}

Execute an OS Command

public static void main (String [] args) throws IOException {

String [] Command = null;

if (System.getProperty("os.name").equals("Linux")) {
Command = new String[1];
Command[0] = "df";
}
if (System.getProperty("os.name").equals("Solaris")) {
Command = new String[2];
Command[0] = "df";
Command[1] = "-k";
}
if (Command == null) {
System.out.println("Can't find free space on this OS");
System.exit(1);
}

Process Findspace = Runtime.getRuntime().exec(Command);

BufferedReader Resultset = new BufferedReader(
new InputStreamReader (
Findspace.getInputStream()));

String line;
while ((line = Resultset.readLine()) != null) {
System.out.println(line);
}
}
}

Simple FTP Client

private void download( String ftpServer, String user, String password,
String fileName, File destination ) throws MalformedURLException,
IOException
{
if (ftpServer != null && fileName != null && destination != null)
{
StringBuffer sb = new StringBuffer( "ftp://" );
// check for authentication else assume its anonymous access.
if (user != null && password != null)
{
sb.append( user );
sb.append( ':' );
sb.append( password );
sb.append( '@' );
}
sb.append( ftpServer );
sb.append( '/' );
sb.append( fileName );
/*
* type ==> a=ASCII mode, i=image (binary) mode, d= file directory
* listing
*/
sb.append( ";type=i" );
BufferedInputStream bis = null;
BufferedOutputStream bos = null;
try
{
URL url = new URL( sb.toString() );
URLConnection urlc = url.openConnection();

bis = new BufferedInputStream( urlc.getInputStream() );
bos = new BufferedOutputStream( new FileOutputStream(
destination.getName() ) );

int i;
while ((i = bis.read()) != -1)
{
bos.write( i );
}
}
finally
{
if (bis != null)
try
{
bis.close();
}
catch (IOException ioe)
{
ioe.printStackTrace();
}
if (bos != null)
try
{
bos.close();
}
catch (IOException ioe)
{
ioe.printStackTrace();
}
}
}
else
{
System.out.println( "Input not available" );
}
}

Setting JAVA_HOME in RHL5

Edit /etc/profile.


JAVA_HOME=/usr/java/jre1.6.0_17
export JAVA_HOME
PATH=$ORACLE_HOME/bin:$JAVA_HOME/bin:$PATH
export PATH

Make your current web page look disabled.

If you need to make your current web page look disabled, in order to display a form or message box, simply add the following div onto your page,
and make sure you give it the following css properties as well.

div:

div id="somediv" class="opaqueDiv"


css:

.opaqueDiv{
-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=30)";
filter: alpha(opacity=30);
position:fixed;
top:0px;left:0px;
background:white;
width:100%;
height:100%;


}

GlassFish Clustering Concepts.

You can have many Domains. - To Manage Separate Applications in a hosting environment.

A Domain has DAS. (Domain Administration Server)

A Domain can have many instances running. Each instance runs in its own JVM.
Each instance will belong to only one domain.
An instance can be clustered or stand-alone.
For instances to be running in a domain, it MUST have a Node Agent.
A Node Agent is for creating and managing instances, and also acts as a watchdog,..fail over stuff.

First Create a Cluster.
Then Create a Node Agent and start it.
Next create an Instance, and note: when creating it you have to specify the node agent that is running. Optionally you can
specify the cluster that you created, if you don't specify it, then it will be taken as stand alone instance.
start the instance you created.
start the cluster if it is not automatically started.

when deploying you can specify the target..to a cluster.

Note : You can share libraries across a cluster.

Setting up SSH Connection

su - root

service sshd start

or

/etc/init.d/sshd start

then make sure your firewall is open on port 22

Open flle /etc/sysconfig/iptables:
Append rule as follows:
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
/sbin service restart iptables.


To disable firewall completelty
____________________________________

system-config-securitylevel

http://www.faqs.org/docs/securing/soft-netfirew.html