Install and configure JDK7 and tomcat in CentOS

1. renewal

1,
Http://www.oracle.com/technetwork/java/javase/downloads/index.html
If a 32-bit system is installed, download the jdk-7u21-linux-i586.rpm;
If a 64-bit system is installed, download the jdk-7u21-linux-x64.rpm;

2. install JDK
Log on with root and execute

rpm -ivh jdk-7u21-linux-i586.rpm

The 64-bit system is:

rpm -ivh jdk-7u21-linux-x64.rpm 

The default installation path is/usr/java/jdk1.7.0 _ 21.

3. configure JDK

vi /etc/profile

Append the following information under the profile file:

export JAVA_HOME=/usr/java/jdk1.7.0_21export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jarexport PATH=$PATH:$JAVA_HOME/bin

Save and exit. execute:

source /etc/profile

Update alternatives and select JDK Version
Run:

update-alternatives --install /usr/bin/java java /usr/java/jdk1.7.0_21/bin/java 60

Configure JDK and run the following command:

update-alternatives --config java

There are 2 programs which provide 'java '.

Selection Command
----------------
* 1/usr/lib/jvm/jre-1.5.0-gcj/bin/java
+ 2/usr/java/jdk1.7.0 _ 21/bin/java

Enter to keep the current selection [+], or type selection number: 2

Select the latest installed/usr/java/jdk1.7.0 _ 21/bin/java, and press enter.

Next, enter java-version to see:
Java version "1.7.0 _ 21 ″
Java (TM) SE Runtime Environment (build 1.7.0 _ 21-b11)
Java HotSpot (TM) Client VM (build 23.7-b11, mixed mode, sharing)

4. download tomcat
Http://archive.apache.org/dist/tomcat/tomcat-7/v7.0.34/bin/apache-tomcat-7.0.34.tar.gz
Decompress the file and execute:

tar -zxvf apache-tomcat-7.0.34.tar.gz

Rename the folder and execute:

mv apache-tomcat-7.0.34 tomcat

Move the decompressed folder. Here I move to the/data/www directory.

5. configure tomcat

vi /etc/profile

Append the following information under the profile file:

export TOMCAT_HOME=/data/www/tomcat/

Save and exit. execute:

 source /etc/profile

6. start tomcat

cd /data/www/tomcat/bin/chmod +x *.sh./ catalina.sh start

7. configure firewall rules and enable port 8080

Vi/etc/sysconfig/iptables-a input-m state -- state NEW-m tcp-p tcp -- dport 8080-j ACCEPT # Allow port 8080 to pass the firewall

Note: This rule should be added to the default port 22 rule.

/Etc/init. d/iptables restart # restart the firewall to make the configuration take effect.

Finally, enter the server ip address 8080 in the browser as follows: http: // 192.168.1.36: 8080 to open the default tomcat page.