jdk,tomcat 小记

一些概念：

(1)JDK JRE,SDK
JRE ＝ Java 运行时环境，有了它就能运行Java程序，可以理解为java虚拟机。
JDK ＝ Java 开发环境，除能运行Java程序外，有Java 标准API类库，可以在此基础上开发Java程序。
JDK包含JRE，JRE包含JVM。
Java SDK最早叫Java Software Develop Kit，后来改名为JDK.

(2) version
JavaTM SE 6, Platform Name and Version Numbers
At this release, the platform name has changed from J2SETM to JavaTM SE. The official name is JavaTM Platform, Standard Edition 6.
Both version numbers (1.6.0 and 6) are used to identify this release of the Java Platform. Version 6 is the product version, while 1.6.0 is the developer version. The number 6 is used to reflect the evolving level of maturity, stability, scalability and security of Java SE.

1. JDK setup

 

1) download jdk from sun.java.com

 jdk-6u11-linux-i586.bin

 

2) unzip

chmod -x jdk-6u11-linux-i586.bin

./jdk-6u11-linux-i586.bin

 

3) change java dir:

mkdir /usr/java

cp -fr ./jdk1.6.0_11 /usr/java

 

4) setup environment

vi /etc/profile to add the following lines

export  JAVA_HOME=/usr/java/jdk1.6.0_11
export  CLASSPATH=$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
export  PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH

 

2. tomcat setup

1). download from  

apache-tomcat-5.5.27.tar.gz

 

2). unzip and test
cd tomcat_dir
 bin/startup.sh
Using CATALINA_BASE:   /usr/local/src/apache-tomcat-5.5.27
Using CATALINA_HOME:   /usr/local/src/apache-tomcat-5.5.27
Using CATALINA_TMPDIR: /usr/local/src/apache-tomcat-5.5.27/temp
Using JRE_HOME:       /usr/java/jdk1.6.0_11

 

access from web browser 

 

3) environment variables
vi /etc/profile
TOMCAT_HOME=/usr/local/src/apache-tomcat-5.5.27