import java.util.Stack; import java.util.StringTokenizer; public class reverse { public static void main(String[] argv) { //Using StringBuilder reverse() String sh = "Hello World 2020"; System.out.println(sh + " -> " + new StringBuilder(sh).reverse()); //Hello World 2020 -> 0202 dlroW olleH //Using Stack & StringTokenizer pushing and poping whole word String s = "Hello World 2020"; Stack<String> myStack = new Stack<>(); StringTokenizer st = new StringTokenizer(s); while (st.hasMoreTokens()) { myStack.push(st.nextToken()); } // Print the stack backwards System.out.print('"' + s + '"' + " backwards by word is:\n\t\""); while (!myStack.empty()) { System.out.print(myStack.pop()); System.out.print(' '); } System.out.println('"'); //"Hello World 2020" backwards by word is: //"2020 World Hello " } }
Tuesday, May 5, 2020
Reversing a String by Word or by Character
You wish to reverse a string, a character, or a word at a time.
You can reverse a string by character easily, using a StringBuilder.
One natural way is to use a StringTokenizer and a stack. Stack is a class that implements an easy-to-use last-in, first-out (LIFO)
Monday, May 4, 2020
Converting Between Unicode Characters and Strings
Unicode is an international standard that aims to represent all known characters used by people in their various languages
Java Strings Part 3
Java Strings Part 2
Java Strings Part 1
public class UnicodeChars { public static void main(String[] argv) { StringBuffer b = new StringBuffer(); for (char c = 'a'; c < 'd'; c++) { b.append(c); } b.append('\u00a5');// Japanese Yen symbol b.append('\u01FC');// Roman AE with acute accent b.append('\u0391');// GREEK Capital Alpha b.append('\u03A9');// GREEK Capital Omega b.append('\u00E1');// á for (int i = 0; i < b.length(); i++) { System.out.printf( "Character #%d (%04x) is %c%n", i, (int) b.charAt(i), b.charAt(i)); } System.out.println("Accumulated characters are " + b); } } //Character #0 (0061) is a //Character #1 (0062) is b //Character #2 (0063) is c //Character #3 (00a5) is ¥ //Character #4 (01fc) is Ǽ //Character #5 (0391) is Α //Character #6 (03a9) is Ω //Character #7 (00e1) is á //Accumulated characters are abc¥ǼΑΩá
Java Strings Part 2
Java Strings Part 1
Monday, April 27, 2020
SAML 2.0 with Docker test-saml-idp & Microsoft Azure Active Directory
In this post we will use the following docker container: https://hub.docker.com/r/kristophjunge/test-saml-idp/
Also check Microsoft Document for SAML: https://docs.microsoft.com/en-us/azure/active-directory/develop/single-sign-on-saml-protocol
First, create an Enterprise Application en Azure AD
Also check Microsoft Document for SAML: https://docs.microsoft.com/en-us/azure/active-directory/develop/single-sign-on-saml-protocol
First, create an Enterprise Application en Azure AD
Then, create our docker container
docker run --name=testsamlidp_idp \
-p 80:80 \
-p 443:443 \
-e SIMPLESAMLPHP_SP_ENTITY_ID=http://site123.com \
-e SIMPLESAMLPHP_SP_ASSERTION_CONSUMER_SERVICE="COPY URL FROM App Federation Metadata Url"
-e SIMPLESAMLPHP_SP_SINGLE_LOGOUT_SERVICE="COPY URL FROM Logout URL" \
-d kristophjunge/test-saml-idp
Open ports in Linux
sudo firewall-cmd --zone=public --add-port=80/tcp --permanent
sudo firewall-cmd --zone=public --add-port=443/tcp --permanent
After container is installed, check it
docker ps
...
56f6309b2e16 kristophjunge/test-saml-idp "docker-php-entrypoi…" 7 days ago Up 45 minutes 0.0.0.0:80->80/tcp, 80/tcp, 0.0.0.0:443->443/tcp testsamlidp_idp
...
Open http://site123.com/simplesaml and go to Federation tab. Tools. XML to SimpleSAMLphp metadata converter
Copy from Azure Ad metadata xml. You can Download the file from Federation Metadata XML or open it in a browser App Federation Metadata Url and copy
Click parse
Copy parsed metadata ro file in saml20-idp-remote.php
You will need to log into container
docker exec -it 56f6309b2e16 bash
Update your container and install vim
apt-get update
apt-get install vim
root@56f6309b2e16:/var/www/simplesamlphp/metadata# pwd
/var/www/simplesamlphp/metadata
root@56f6309b2e16:/var/www/simplesamlphp/metadata# ls -las
total 44
0 drwxr-xr-x. 1 root root 34 Feb 4 2018 .
0 drwxr-xr-x. 1 root root 18 Feb 4 2018 ..
4 -rw-r--r--. 1 root root 296 Jan 31 2018 adfs-idp-hosted.php
4 -rw-r--r--. 1 root root 268 Jan 31 2018 adfs-sp-remote.php
4 -rw-r--r--. 1 root root 2374 Jan 31 2018 saml20-idp-hosted.php
4 -rw-r--r--. 1 root root 216 Jan 31 2018 saml20-idp-remote.php
4 -rw-r--r--. 1 root root 376 Feb 4 2018 saml20-sp-remote.php
4 -rw-r--r--. 1 root root 620 Jan 31 2018 shib13-idp-hosted.php
4 -rw-r--r--. 1 root root 385 Jan 31 2018 shib13-idp-remote.php
4 -rw-r--r--. 1 root root 232 Jan 31 2018 shib13-sp-hosted.php
4 -rw-r--r--. 1 root root 418 Jan 31 2018 shib13-sp-remote.php
4 -rw-r--r--. 1 root root 225 Jan 31 2018 wsfed-idp-remote.php
4 -rw-r--r--. 1 root root 167 Jan 31 2018 wsfed-sp-hosted.php
root@56f6309b2e16:/var/www/simplesamlphp/metadata# cp saml20-idp-remote.php saml20-idp-remote.php.bak
vi saml20-idp-remote.php
Copy parsed metadata
Go to config
root@56f6309b2e16:/var/www/simplesamlphp/config# pwd
/var/www/simplesamlphp/config
root@56f6309b2e16:/var/www/simplesamlphp/config# ls -las
total 44
0 drwxr-xr-x. 1 root root 29 Feb 4 2018 .
0 drwxr-xr-x. 1 root root 22 Feb 4 2018 ..
4 -rw-r--r--. 1 root root 1577 Jan 31 2018 acl.php
4 -rw-r--r--. 1 root root 2143 Jan 31 2018 authmemcookie.php
4 -rw-r--r--. 1 root root 519 Feb 4 2018 authsources.php
32 -rw-r--r--. 1 root root 30170 Feb 4 2018 config.php
Backup authsources.php
root@56f6309b2e16:/var/www/simplesamlphp/config# cp authsources.php authsources.php.bak
Add the following
'default-sp' => array(
'saml:SP',
'entityID' => 'https://site123.com',
'idp' => '"COPY URL FROM Azure AD Identifier"/',
'discoURl' => null,
'NameIDFormat' => 'urn:oasis:names:tc:SAML:2.0:nameid-format:persistent',
'simplesaml.nameidattribute' => 'eduPersonTargetedID',
),
In Azure AD go to App Registration and add redirect URI
Test your SSO going to https://site123.com/simplesaml
Go to Authentication
default-sp
Microsoft Login Screen appears
Log In
Thursday, April 23, 2020
Install Docker on CentOS 7
Create Docker User
groupadd docker
useradd -g docker docker
passed xxxxxxx
Change to user docker
su - docker
Install Packages
sudo yum install -y yum-utils device-mapper-persistent-data lvm2
Add Docker Repo
sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
Install Docker
sudo yum install docker-ce docker-ce-cli containerd.io
Start and Enable Docker
sudo systemctl start docker
sudo systemctl enable docker
Docker Info docker info
Client:
Debug Mode: false
Server:
Containers: 0
Running: 0
Paused: 0
Stopped: 0
Images: 0
Server Version: 19.03.8
Storage Driver: overlay2
Backing Filesystem: <unknown>
Supports d_type: true
Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
Volume: local
Network: bridge host ipvlan macvlan null overlay
Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 7ad184331fa3e55e52b890ea95e65ba581ae3429
runc version: dc9208a3303feef5b3839f4323d9beb36df0a9dd
init version: fec3683
Security Options:
seccomp
Profile: default
Kernel Version: 3.10.0-1062.18.1.el7.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64
CPUs: 4
Total Memory: 7.638GiB
Name: CentOS7Docker
ID: 3YJD:HCHM:5MAU:IXRO:4SP7:BTNB:XMYA:OV73:F5U2:JLYC:AQAJ:7N3V
Docker Root Dir: /var/lib/docker
Debug Mode: false
Registry: https://index.docker.io/v1/
Labels:
Experimental: false
Insecure Registries:
127.0.0.0/8
Live Restore Enabled: false
Docker processes
docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
Verify Docker
docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
0e03bdcc26d7: Pull complete
Digest: sha256:8e3114318a995a1ee497790535e7b88365222a21771ae7e53687ad76563e8e76
Status: Downloaded newer image for hello-world:latest
Hello from Docker!
This message shows that your installation appears to be working correctly
.......
groupadd docker
useradd -g docker docker
passed xxxxxxx
Change to user docker
su - docker
Install Packages
sudo yum install -y yum-utils device-mapper-persistent-data lvm2
Add Docker Repo
sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
Install Docker
sudo yum install docker-ce docker-ce-cli containerd.io
Start and Enable Docker
sudo systemctl start docker
sudo systemctl enable docker
Docker Info docker info
Client:
Debug Mode: false
Server:
Containers: 0
Running: 0
Paused: 0
Stopped: 0
Images: 0
Server Version: 19.03.8
Storage Driver: overlay2
Backing Filesystem: <unknown>
Supports d_type: true
Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
Volume: local
Network: bridge host ipvlan macvlan null overlay
Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 7ad184331fa3e55e52b890ea95e65ba581ae3429
runc version: dc9208a3303feef5b3839f4323d9beb36df0a9dd
init version: fec3683
Security Options:
seccomp
Profile: default
Kernel Version: 3.10.0-1062.18.1.el7.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64
CPUs: 4
Total Memory: 7.638GiB
Name: CentOS7Docker
ID: 3YJD:HCHM:5MAU:IXRO:4SP7:BTNB:XMYA:OV73:F5U2:JLYC:AQAJ:7N3V
Docker Root Dir: /var/lib/docker
Debug Mode: false
Registry: https://index.docker.io/v1/
Labels:
Experimental: false
Insecure Registries:
127.0.0.0/8
Live Restore Enabled: false
Docker processes
docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
Verify Docker
docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
0e03bdcc26d7: Pull complete
Digest: sha256:8e3114318a995a1ee497790535e7b88365222a21771ae7e53687ad76563e8e76
Status: Downloaded newer image for hello-world:latest
Hello from Docker!
This message shows that your installation appears to be working correctly
.......
Thursday, March 19, 2020
Tuesday, March 3, 2020
Weblogic 12.2.1.4 installation
OS: CentoOS 7
ssh -X root@192.168.2.202
Install JDK
rpm -ihv jdk-8u241-linux-x64.rpm
java -version
java version "1.8.0_241"
Java(TM) SE Runtime Environment (build 1.8.0_241-b07)
Java HotSpot(TM) 64-Bit Server VM (build 25.241-b07, mixed mode)
mkdir /u01
groupadd oinstall
usermod -g oinstall oracle
chown -R oracle:oinstall /u01
chmod -R 775 /u01
chmod g+s /u01
su - oracle
export DISPLAY=192.168.2.163:0.0
java -jar fmw_12.2.1.4.0_wls.jar
Automatically launch create domain
If you want to create domain with all options:
/u01/oracle/Oracle/Middleware/Oracle_Home/oracle_common/common/bin/config.sh
Check ports
netstat -an | grep LIST
....
192.168.2.202:7001
....
Check firewall rule
[oracle@centos7 ~]$ sudo firewall-cmd --list-all
public (active)
target: default
icmp-block-inversion: no
interfaces: eth0
sources:
services: dhcpv6-client ssh
ports:
protocols:
masquerade: no
forward-ports:
source-ports:
icmp-blocks:
rich rules:
[oracle@centos7 ~]$ sudo firewall-cmd --get-default-zone
public
Add port 7001
[oracle@centos7 ~]$ sudo firewall-cmd --zone=public --add-port=7001/tcp --permanent
success
[oracle@centos7 ~]$ sudo firewall-cmd --reload
success
[oracle@centos7 ~]$ sudo firewall-cmd --list-all
public (active)
target: default
icmp-block-inversion: no
interfaces: eth0
sources:
services: dhcpv6-client ssh
ports: 7001/tcp
protocols:
masquerade: no
forward-ports:
source-ports:
icmp-blocks:
rich rules:
Check console
User: weblogic
Pass: xxxxxxxx
Start Servies
Pass: xxxxxxxx
Start Servies
/u01/oracle/Oracle/Middleware/Oracle_Home/user_projects/domains/wl_server
nohup ./startWebLogic.sh &
Console
Node Manager
/u01/oracle/Oracle/Middleware/Oracle_Home/user_projects/domains/wl_server/bin
nohup ./startNodeManager.sh &
Check Open Ports
[oracle@centos7 bin]$ netstat -an | grep LIST
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp6 0 0 127.0.0.1:1527 :::* LISTEN
tcp6 0 0 192.168.2.202:7001 :::* LISTEN
tcp6 0 0 ::1:7001 :::* LISTEN
tcp6 0 0 127.0.0.1:7001 :::* LISTEN
tcp6 0 0 ::1:25 :::* LISTEN
tcp6 0 0 127.0.0.1:5556 :::* LISTEN
tcp6 0 0 :::22 :::* LISTEN
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In this post we will use the following docker container: https://hub.docker.com/r/kristophjunge/test-saml-idp/ Also check Microsoft Docume... -
You wish to reverse a string, a character, or a word at a time. You can reverse a string by character easily, using a StringBuilder. One na...