Send Mail With Java

This is a sample code for writing with java to send email:

import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;

public class test {
    public static void main(String args[]) throws Exception {
        String user = "test";
        String password = "test";
        String fromAddress = "test@localhost";
        String toAddress = "test@gmail.com";    
        Properties properties = new Properties();  
        properties.put("mail.smtp.host", "localhost");  
        properties.put("mail.smtp.port", "25");  
        properties.put("mail.smtp.username", user);  
        properties.put("mail.smtp.password", password);
        properties.put("mail.transport.protocol", "smtp");
        Session session = Session.getDefaultInstance(properties, null);  
        try          
        {      
            Message message = new MimeMessage(session);      
            message.setFrom(new InternetAddress(fromAddress));      
            message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(toAddress));      
            message.setSubject("Email from our JAMEs");      
            message.setText("hiiiiii!!");      
            Transport.send(message);      
            System.out.println("Email sent");  
        }  
        catch (MessagingException e)  
        {    
            e.printStackTrace();  
        }
        }
}

Solution:
If we test it and it cannot send. This is the guide for resolving problem as below:
1.Go to the path : \apps\james\conf
2.Open for edit the filename 'james-fetchmail.xml'
3.Change "fetchmail" from false to true as:
4.Restart the Apache James Server.
5.You would see the following messages printed on the console after you start the server:
James Mail Server 2.3.2 Remote Manager Service started plain:4555 POP3 Service started
plain:110 SMTP Service started plain:25 NNTP Service started plain:119 FetchMail Started.

Using Array String in Java

This is simple code for using array string:

How to create and use Nested and Inner Class in Java

- ជាដំបូងយើងត្រូវបង្កើត file  class name: outer.java:

public class Outer {
    int outer_x=100;
   
    void test(){
        Inner inner=new Inner();  
        inner.display();
    }
    class Inner{
        void display(){
            System.out.println("display outer_x:"+outer_x);
        }
    }
}

ហើយបន្ទាប់មកបង្កើត File main class name: Callouter.java:

public class CallOuter {
    public static void main(String args[]){
        Outer obj=new Outer();
        obj.test();
    }
}

វាកូដគំរូដ៏សាមញ្ញមួយ សូមអរគុណ!

Sample Some configure in Linux

I. Samba Server (text mod):

            - We have to have three packages: samba-common-<version>.rpm, samba-<version>.rpm, system-config-samba<version>.rpm

            - We have to check samba packages: # rpm –qa samba samba-common system-config-samba if it doesn’t have, we will install it.

            - Create directory: # mkdir /var/Docs

            - Create Users:

            # useradd dara, # passwd 123456

            # useradd vanna, # passwd 123456

            - # chmod –R 444 /var/Docs // note: we don’t set permission on it

            - adding samba users:

            # smbpasswd –a dara , password:123456

# smbpasswd –a vanna, password:123456

- adding sharing

# vi /etc/samba/smb.conf

[Shared]

            Path = /var/Docs/

            Browseable = yes

            Read only = yes

            Valid user = dara

[Shared]

            Path = /var/Docs

            Browseable = yes

            Writeable = yes

            Valid user = vanna

- Close firewall and selinux:

# system-config-firewall (Press Disable à OK)

# system-config-selinx (Choose Disable, and permissive)     

- # service smb restart

- Testing shared folder from windows (http://localhost:901/)

II. Samba Swat (Interface):

            - We have to have two packages: samba-swat-<version>.rpm, xinetd-<version>.rpm

            - We have to check samba packages: # rpm –qa samba-swat xinetd  if it doesn’t have, we will install it.

            - Edit /etc/xinetd.d/swat

            # vi /etc/xinetd.d/swat

            Change “disable=yes” to “disable=no”

            - Open browser logon as root (http://localhost:901/)

III. How to configure IP address:

            - # ifconfig –a

            - # vi /etc/sysconfig/network

            SET: “HOSTNAME=setec.abc.com”

            - # vi /etc/sysconfig/network-script/ifcfg-eth0

            Set: BOOTPROTO=none, IPADDR=192.168.10.1, NETMASK=255.255.255.0

            - # service network restart

            - # ifconfig –a or # ifconfig eth0

IV. How to configure DNS Server:

            +  check service bind

            - # rpm –qa bind bind-utils bind-libs bind-chroot // if not, we install it from Disk

            - # vi /var/named/chroot/etc/named.conf

            Add:

            . forward zone:

Zone “abc.com” IN {

            Type master;

            File “abc.f”;

};

. reverse zone:

Zone “10.168.192.in-addr.arpa” IN {

            Type master;

            File “abc.r”;

};

- # vi /var/named/chroot/var/named/abc.f

Add:

$TTL 2D

@ SOA           dns.abc.com.   root.abc.com. (1 2D 1D 1W 1H)

                        NS       dns.abc.com.

                        A         192.168.10.1

Dns                  A         192.168.10.1

- # vi /var/named/chroot/var/named/abc.r

Add:

$TTL 2D

@ SOA           dns.abc.com.   root.abc.com.  (1 2D 1D 1W 1H)

                        NS       dns.abc.com.

                        A         192.168.10.1

1                      PTR     dns.abc.com.

- # service named restart

- # vi /etc/resolve.conf

Add # before line as below:

# search com

            # nameserver 192.168.10.1

            # nameserver 192.168.10.2

- dig abc.com or nslookup abc.com

V. How to configure Web Server, FTP Server:

            - first, we have configure DNS Server:

            -# vi /var/named/chroot/var/named.conf

            Add:

                        Zone    “abc.com” IN {

            Type master;

            File “abc”;

};

            - # vi /var/named/chroot/var/named/abc

            Add:

            $TTL 2D

            @ SOA           dns.abc.com.   root.abc.com. (1 2D 1D 1W 1H)

                                    NS       dns.abc.com.

                                    A         192.168.10.1

            Dns                  A         192.168.10.1

            www               CNAME         dns

            ftp                   CNAME         dns

            - # service named restart

            - Check web server package:

            - # rpm –qa httpd // if not, we install it from CD

            - Create Directory for Web

            # mkdir /var/abc

            - # chmod –R 755 /var/abc

            - # vi /var/abc/index.html

            - # vi /etc/httpd/conf/httpd.conf

            Add:

            NameVirtualHost        192.168.10.1

            <VirtualHost 192.168.10.1>

                        DocumentRoot  /var/abc/

                        ServerName    abc.com          

                        DirectoryIndex           index.html

            </VirtualHost>

            - Close firewall and selinux service:

            # system-config-firewall

            # system-config-selinux

            - # service httpd restart

            + Check ftp package:

            # rpm –qa vsftpd  // if not, we install it from CD

            - Create directory for ftp server:

            # mkdir /var/ftp

            # chmod –R 755 /var/ftp

            # useradd –d /var/ftp  webadmin

            # passwd webadmin

            - # vi /etc/vsftpd/vsftpd.conf

            Change “anonymous_enable=YES” to “anonymous_enable=NO”

            - # service vsfptd restart

VI. How to configure DHCP Server:

            - check dhcp package:

            # rpm –qa dhcpd // if not, we install it from CD

            - # vi /etc/sysconfig/network-scripts/ifcfg-eth0

            BOOTPROTO=static

            ONBOOT=yes

            IPADDR=192.168.10.1

            NETMASK=255.255.255.0

            NETWORK=192.168.10.0

            - # service network  restart

            - # ifconfig eth1

            - # vi /etc/dhcpd.conf

            Add:

            ddns-update-style interim;

            ignore client-updates;

            subnet 192.168.10.0 netmask 255.255.255.0 {

            option routers                          192.168.10.1;

            option subnet-mask                 255.255.255.0;

            range   192.168.10.50 192.168.10.100;

            default-lease-time       21600;

            max-lease-time            43200;

            host PC-20001 {

            hardware ethernet 00:0c:29:58:6e:36;

            fixed-address 192.168.10.91;

}

}

- # service dhcpd restart

- # chkconfig --list dhcpd

- # chkconfig --level 35 dhcpd on

- # chkconfig --list dhcpd

- # reboot

- # more /var/lib/dhcpd/dhpcd.leases

VII. How to configure NFS server:

            - We have to have two files: nfs-utils-<version>.rpm, system-config-utils-<version>.rpm

            - Check NFS packages: # rpm –qa nfs-utils system-config-nfs // if not, we install it from CD

            -  Create folder for sharing

            # mkdir /tmp/Shared

            - # vi /etc/exports

            Add:

            /tmp/Shared     192.168.10.1/255.255.255.0 (sync,rw) //client can read and write on network

            Or add

            /tmp/Shared     192.168.10.1/255.255.255.0 (sync,rw,no_root_squash)

            Or add

/tmp/Shared     192.168.10.1/255.255.255.0 (sync,ro,no_root_squash)

- # exportfs –a

            - # service nfs restart

            **mount sharing for client:

            # mount 192.168.9.1:/shared   /tmp/Shared

            *** Create automount sharing for client:

            # vi /etc/fstab

            Add

            192.168.100.1:/shared    /tmp/Shared   nfs   defaults   1  2

VIII. How to configure Mail Server:

            We have to install DNS server:

- # vi /var/named/chroot/etc/maned.conf

            Add:

            Zone “abc.com” IN {

            Type master;

            File “abc”;

};

- # vi /var/named/chroot/var/maned/abc

Add:

$TTL 2D

@ SOA           dns.abc.com.   root.abc.com. (1 2D 1D 1W 1H)

                        NS       dns.abc.com.

                        Mx       10        mail.abc.com.

A         192.168.10.1

Dns                  A         192.168.10.1

Mail                 A         192.168.10.1

- # service named restart

            - We have to have three packages: sendmail-<version>.rpm, sendmail-cf-<version>.rpm, sendmail-doc-<version>.rpm

            - Check mail packages:

            # rpm –qa sendmail, # rpm –qa sendmail-cf, # rpm –qa sendmail-doc // if not we install it

- # vi /etc/mail/sendmail.mc

Delete one line:

dnl # DAEMON_OPTIONS(“Port=smtp, Addr=127.0.0.1, Name=MTA”) dnl

            - #m4 /etc/mail/sendmail.mc > /etc/mail/sendmail-cf

            - # service sendmail restart

           

IX. How to configure DHCP Client:

- /etc/sysconfig/network file should contain the following line:

NETWORKING=yes

The /etc/sysconfig/network-scripts/ifcfg-eth0 file should contain the following lines:

DEVICE=eth0
BOOTPROTO=dhcp
ONBOOT=yes

A configuration file is needed for each device to be configured to use DHCP.

Other options
PEERDNS=, where is one of the following:
yes — Modify /etc/resolv.conf with information from the server. If using DHCP, then yes is the default.
no — Do not modify /etc/resolv.conf.

USERCTL=, where is one of the following:
yes — Non-root users are allowed to control this device.
no — Non-root users are not allowed to control this device.

Removing an element from an Array (Java)

public static String[] removeElements(String[] input, String deleteMe) {
    List result = new LinkedList();

    for(String item : input)
        if(!deleteMe.equals(item))
            result.add(item);

    return result.toArray(input);
}