Java Mail - Send email the Java way

Send Email using Java Mail API



Using ELOH to say HELO
-S

Linux Permissions

It doesn't belong here ... but was worth sharing.

• chmod /*change the permissions of a file*/
• chown /*change the owner of the file*/
• chgrp /*change the group that the file belongs to*/

example:
chmod 777 somefile.file /*this gives exe write and read to all */ not recommended for any file.

For chmod here is a list of the numbers and what they mean

• the 100's are for the owner of the file

400 reed
200 write
100 execute

• 10's are for the group of the file

40 read
20 write
10 execute

• 1's are for everyone else

4 read
2 write
1 execute

you add the number together to get different permissions


Time is the most precious thing one can give . -S

Common Connection Strings

A List of JDBC Drivers

If you need to access a database with Java, you need a driver. This is a list of the drivers available, what database they can access, who makes it, and how to connect them.

IBM DB2
jdbc:db2://:/
com.ibm.db2.jdbc.app.DB2Driver

JDBC-ODBC Bridge
jdbc:odbc:
sun.jdbc.odbc.JdbcOdbcDriver

Microsoft SQL Server
jdbc:weblogic:mssqlserver4:@:
weblogic.jdbc.mssqlserver4.Driver

Oracle Thin
jdbc:oracle:thin:@::
oracle.jdbc.driver.OracleDriver

PointBase Embedded Server
jdbc:pointbase://embedded[:]/
com.pointbase.jdbc.jdbcUniversalDriver

Cloudscape
jdbc:cloudscape:
com.cloudscape.core.JDBCDriver

Cloudscape RMI
jdbc:rmi://:/jdbc:cloudscape:
RmiJdbc.RJDriver

Firebird (JCA/JDBC Driver)
jdbc:firebirdsql:[//[:]/]
org.firebirdsql.jdbc.FBDriver

IDS Server
jdbc:ids://:/conn?dsn=''
ids.sql.IDSDriver

Informix Dynamic Server
jdbc:informix-sqli://:/:INFORMIXSERVER=
com.informix.jdbc.IfxDriver

InstantDB (v3.13 and earlier)
jdbc:idb:
jdbc.idbDriver

InstantDB (v3.14 and later)
jdbc:idb:
org.enhydra.instantdb.jdbc.idbDriver

Interbase (InterClient Driver)
jdbc:interbase:///
interbase.interclient.Driver

Hypersonic SQL (v1.2 and earlier)
jdbc:HypersonicSQL:
hSql.hDriver

Hypersonic SQL (v1.3 and later)
jdbc:HypersonicSQL:
org.hsql.jdbcDriver

Microsoft SQL Server (JTurbo Driver)
jdbc:JTurbo://:/
com.ashna.jturbo.driver.Driver

Microsoft SQL Server (Sprinta Driver)
jdbc:inetdae::?database=
com.inet.tds.TdsDriver

Microsoft SQL Server 2000 (Microsoft Driver)
jdbc:microsoft:sqlserver://:[;DatabaseName=]
com.microsoft.sqlserver.jdbc.SQLServerDriver

MySQL (MM.MySQL Driver)
jdbc:mysql://:/
org.gjt.mm.mysql.Driver

Oracle OCI 8i
jdbc:oracle:oci8:@
oracle.jdbc.driver.OracleDriver

Oracle OCI 9i
jdbc:oracle:oci:@
oracle.jdbc.driver.OracleDriver

PostgreSQL (v6.5 and earlier)
jdbc:postgresql://:/
postgresql.Driver

PostgreSQL (v7.0 and later)
jdbc:postgresql://:/
org.postgresql.Driver

Sybase (jConnect 4.2 and earlier)
jdbc:sybase:Tds::
com.sybase.jdbc.SybDriver

Sybase (jConnect 5.2)
jdbc:sybase:Tds::
com.sybase.jdbc2.jdbc.SybDriver

To test your driver once it's installed, try the following code:

{
Class.forName("Driver name");
Connection con = DriverManager.getConnenction("jdbcurl","username","password");
//other manipulation using jdbc commands
}
catch(Exception e)
{
}

Removing the Extra Fat - JBoss

You can remove the following components:

• AOP Application
• Cache invalidation service (keep for a clustered installation)
• Console/e-mail monitor alerts
• CORBA/IIOP
• HTTP Invoker
• Hibernate session Management services
• HSQL DB
• Integrated HAR deployer
• J2EE client deployer service
• JBoss scheduler manager
• JMX Console
• Mail service
• Management console
• Sample Schedule service
• Scheduler service
• Test queues and topics
• UUID key Generation
• Web services support

You can remove all or selected ones depending on what services of JBoss your application will be using. Generally applications have their own implementation of Schedulers, Mail services Queues etc. but if you are dependent on JBoss's implementation then choose wisely.

How and What to remove:

For removing the ones listed above you need to take care of their dependencies else JBoss will be sad and fill your log.

Slimming helps ... LEANER your code FATTER your salary ... :) .
-S

SSL and JBOSS : Baby Steps

I am not sure how many of you have visited http://24x7-java.blogspot.com/ and felt good.

You'll find lots of pages describing the process of enabling ssl on JBoss, but many of them explain in a way which it too technical. The intention here is to let everyone do it easily (on windows OS).

So describing it in baby steps

Q. What you need?

A. JDK and JBoss

Step 1. Open command prompt and goto bin directory under JDK (not jre) and execute

keytool -genkey -alias tomcat -keyalg RSA

(if you have JAVA_HOME/bin in your system path then you can just execute the above command on the prompt ).

You'll be prompted for the following and fill as per your need.

Enter keystore password:
Re-enter new password:
What is your first and last name?
[Unknown]: Sunil

What is the name of your organizational unit?
[Unknown]: development

What is the name of your organization?
[Unknown]: test

What is the name of your City or Locality?
[Unknown]: Shimla

What is the name of your State or Province?
[Unknown]: HP

What is the two-letter country code for this unit?
[Unknown]: IN

Is CN=Sunil, OU=development, O=test, L=Shimla, ST=HP, C=IN correct?
[no]: Yes

Enter key password for
(RETURN if same as keystore password):

Keep the key password same as your keystore for ease.

Step 2. Copy the default keystore created in your C:\Documents and Settings\<currently-loggedin-user>.keystore
to
<drivepath>:\jboss\server\default\conf and rename it to my.keystore

Step 3. Edit file
<drivepath>:\jboss\server\default\deploy\jboss-web.deployer\server.xml or
<drivepath>:\jboss\server\default\deploy\jbossweb-tomcat55.sar\server.xml depending on the version of jBoss and make the following changes.

<Connector port="443" protocol="HTTP/1.1" SSLEnabled="true"
maxThreads="150" scheme="https" secure="true"
clientAuth="false"
strategy="ms"
address="${jboss.bind.address}"
keystoreFile="${jboss.server.home.dir}/conf/my.keystore"
keystorePass="keypassword"
truststoreFile="${jboss.server.home.dir}/conf/my.keystore"
truststorePass="keypassword"
sslProtocol="TLS"/>

Step 4. Start you jboss run -c default and thats all. Your application will now be avaliable on both http:// and https:// . If you want to disable http:// Comment the tag below in server.xml

<Connector port="80" address="${jboss.bind.address}"
maxThreads="250" maxHttpHeaderSize="8192"
emptySessionPath="true" protocol="HTTP/1.1"
enableLookups="false" redirectPort="443" acceptCount="100"
connectionTimeout="20000" disableUploadTimeout="true" />

The Connector port is by default 8080.

Computer never makes mistake ... its always the human part
-S