Web And Database Port Listing
If you are about to peep into web technology, here is something which will interest you. The whole of web architecture is divided on basis of ports. A particular port offers particular service. These ports can be standard or can be manually assigned for user defined services. Here is the port listing for some standard applications…
|
Port |
Server |
|
66 |
Oracle SQL*Net |
|
80 |
Hyper Text Transfer Protocol (HTTP) |
|
81 |
HTTP Proxy, Alternative HTTP Port, Cobalt Server Administration Port |
|
443 |
Secure Socket Layer (SSL) |
|
445 |
Microsoft SQL Server over NetBIOS |
|
457 |
UnixWare/Netscape FastTrack Server |
|
1080 |
SOCKS Proxy |
|
1100 |
Oracle WebCache Listener |
|
1241 |
KaZaA File Sharing Server (HTTP-like protocol) |
|
1352 |
Lotus Domino (Notes) |
|
1433 |
Microsoft SQL Server 2000 |
|
1434 |
Microsoft SQL Server over TCP/IP Redirector |
|
1521–1530 |
Oracle |
|
1944 |
Microsoft SQL Server 7 |
|
2301 |
Compaq Insight Manager, Compaq Survey Utility |
|
3128 |
HTTP Proxy (Squid, NetCache, etc.) |
|
3306 |
mySQL |
|
4000 |
Oracle WebCache Listener |
|
4001 |
Oracle WebCache Listener |
|
4002 |
Oracle WebCache Listener |
|
4100 |
Sybase 11.0 (jConnect) |
|
5000 |
Sybase 12.x |
|
5432 |
PostgreSQL |
|
5800 |
VNC HTTP Console Port #1 |
|
5801 |
VNC HTTP Console Port #2 |
|
5802 |
VNC HTTP Console Port #3 |
|
6346 |
Gnutella (HTTP-like protocol) |
|
6347 |
Gnutella (HTTP-like protocol) |
|
7001 |
BEA WebLogic |
|
7002 |
BEA WebLogic |
|
8000 |
HTTP Proxy, Alternative HTTP Port, HP Web JetAdmin Version 6.0 |
|
8001 |
BEA WebLogic |
|
8005 |
Apache Tomcat Administration Server (non-HTTP protocol) |
|
8080 |
HTTP Proxy, Alternative HTTP Port |
|
8888 |
HTTP Proxy, Alternative HTTP Port |
|
30821 |
Netscape Enterprise Server Administration Server |
If you are interested in running your own service, you need to make an entry to the lookup table which is maintained at the server hosting the services. Generally RMI, RPC, Sockets Streaming, CORBA etc. kinds of applications find a great use of ports and their usage.
Programming A Virus
Why is everybody scared of computer virus ? because it causes harmful actions to our data and system !! right ?
Logic – If we go to the root, virus just do something that is not desired. Example if we write a program that erases 1 byte from any exe file, that is a virus because the file is no more usable. The main idea is to force a user to run the virus code. This is done by attaching it or embedding the object file along with some utilities.
Code For TSR Virus – Following here is an example code for TSR virus. This is not much harmful. It just changes the attribute (color) of characters present on the screen.
Way For Anti Virus – Every virus has a signature which is easy to match. By this signature only, the identity of virus is done. So, for detecting virus, just search the signature (known as virus definition) in files. 
Caution – Try this programming at your own risk !!
RSA encyption using Java
The most difficult implementation faced Java Cryptographic Extension comes in asymmetric key algorithms. The problem is to generate a key and use them after distribution. The answer to the question is to make the keys persistent as soon as they are generated in separate files. Once files for all the (public and private) keys are made, our issue gets over. Doing this is not a simple job because key generation comes from a lots of hidden packages. Attached here are examples of asymmetric key generation and their use.
Key generation Key generator
Encryption RSA Encryption
Defining DSN on the fly in java
Talking about the traditional way of connecting to database involves.. Defining a driver making a dsn in the administrator console etc. Here is a short way in which you don’t need to worry about setting a dsn everytime project location gets shifted.
You can use the JDBC-ODBC but define your DSN “on the fly” by passing all ODBC configuration params inside the connect string:
// example for db test1.mdb, user dba, pw sql con = DriverManager.getConnection(
"jdbc:odbc:Driver={MicroSoft Access Driver (*.mdb)};
DBQ=C:/data/Access/test1.mdb","dba","sql");
Look out: 1 blank before (*.mdb) !!!
Don’t forget the Class.forName() before!
New Features of JDK 1.5
One most common question which I faced in 4/7 interviews for my campus recruitment drive was the topic of this post.
The most prolific feature that comes as an advancement over previous version is “generics and collections”. This feature allows us to come in new era of data structures. It includes enhanced packages for arraylists, vectors, linkedlists etc. and even provides a lots of support for variance in enterprise environment.
New Features in JDK 1.5 Virtual Machine
JDK 1.5 garbage collector comes with a unique capability called ergonomics over previous version. This gives a set of tuners or command line options for the programmer to tune the garbage collector without peeping into the code itself. This includes a lots of new profilers and type setters.
