安装JDK之前检查，在RedHat5企业版中默认安装了jdk1.4，需要卸载 [root@javasrv ~]# java --version java version "1.4.2" gij (GNU libgcj) version 4.1.2 20071124 (Red Hat 4.1.2-42) Copyright (C) 2006 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. [root@javasrv ~]# yum remove java Loading "security" plugin Loading "rhnplugin" plugin This system is not registered with RHN. RHN support will be disabled. Setting up Remove Process Resolving Dependencies --> Running transaction check ---> Package java-1.4.2-gcj-compat.i386 0:1.4.2.0-40jpp.115 set to be erased --> Processing Dependency: java-gcj-compat for package: antlr --> Processing Dependency: java-gcj-compat for package: antlr --> Processing Dependency: java-gcj-compat >= 1.0.64 for package: gjdoc --> Processing Dependency: java-gcj-compat >= 1.0.64 for package: gjdoc --> Running transaction check ---> Package antlr.i386 0:2.7.6-4jpp.2 set to be erased ---> Package gjdoc.i386 0:0.7.7-12.el5 set to be erased --> Finished Dependency Resolution Dependencies Resolved ============================================================================= Package Arch Version Repository Size ============================================================================= Removing: java-1.4.2-gcj-compat i386 1.4.2.0-40jpp.115 installed 441 Removing for dependencies: antlr i386 2.7.6-4jpp.2 installed 2.5 M gjdoc i386 0.7.7-12.el5 installed 1.7 M Transaction Summary ============================================================================= Install 0 Package(s) Update 0 Package(s) Remove 3 Package(s) Is this ok [y/N]: y Downloading Packages: Running rpm_check_debug Running Transaction Test Finished Transaction Test Transaction Test Succeeded Running Transaction Erasing : antlr ######################### [1/3] Erasing : gjdoc ######################### [2/3] Erasing : java-1.4.2-gcj-compat ######################### [3/3] Removed: java-1.4.2-gcj-compat.i386 0:1.4.2.0-40jpp.115 Dependency Removed: antlr.i386 0:2.7.6-4jpp.2 gjdoc.i386 0:0.7.7-12.el5 Complete! [root@javasrv ~]# 安装JDK环境，JDK6.0即java 1.6.0 [root@javasrv ~]# cd /usr/local/src [root@javasrv src]# chmod 755 jdk-6u22-linux-i586-rpm.bin [root@javasrv src]# ./jdk-6u22-linux-i586-rpm.bin //安装后生成目录/usr/java Extracting... UnZipSFX 5.50 of 17 February 2002, by Info-ZIP (Zip-Bugs@lists.wku.edu). inflating: jdk-6u22-linux-i586.rpm inflating: sun-javadb-common-10.5.3-0.2.i386.rpm inflating: sun-javadb-core-10.5.3-0.2.i386.rpm inflating: sun-javadb-client-10.5.3-0.2.i386.rpm inflating: sun-javadb-demo-10.5.3-0.2.i386.rpm inflating: sun-javadb-docs-10.5.3-0.2.i386.rpm inflating: sun-javadb-javadoc-10.5.3-0.2.i386.rpm Preparing... ########################################### [100%] 1:jdk ########################################### [100%] Unpacking JAR files... rt.jar... jsse.jar... charsets.jar... tools.jar... localedata.jar... plugin.jar... javaws.jar... deploy.jar... Installing JavaDB Preparing... ########################################### [100%] 1:sun-javadb-common ########################################### [ 17%] 2:sun-javadb-core ########################################### [ 33%] 3:sun-javadb-client ########################################### [ 50%] 4:sun-javadb-demo ########################################### [ 67%] 5:sun-javadb-docs ########################################### [ 83%] 6:sun-javadb-javadoc ########################################### [100%] Java(TM) SE Development Kit 6 successfully installed. Product Registration is FREE and includes many benefits: * Notification of new versions, patches, and updates * Special offers on Sun products, services and training * Access to early releases and documentation Product and system data will be collected. If your configuration supports a browser, the Sun Product Registration form for the JDK will be presented. If you do not register, none of this information will be saved. You may also register your JDK later by opening the register.html file (located in the JDK installation directory) in a browser. For more information on what data Registration collects and how it is managed and used, see: http://java.sun.com/javase/registration/JDKRegistrationPrivacy.html Press Enter to continue..... Done. [root@javasrv src]# ll /usr/java total 4 lrwxrwxrwx 1 root root 16 Jul 3 19:26 default -> /usr/java/latest drwxr-xr-x 9 root root 4096 Jul 3 19:26 jdk1.6.0_22 lrwxrwxrwx 1 root root 21 Jul 3 19:26 latest -> /usr/java/jdk1.6.0_22 配置环境变量 修改/etc/profile文件(系统级别有效) [root@javasrv src]# vi /etc/profile JAVA_HOME=/usr/java/default PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib:$CLASSPATH export PATH USER LOGNAME MAIL HOSTNAME HISTSIZE INPUTRC JAVA_HOME CLASSPATH [root@javasrv src]# source /etc/profile [root@javasrv src]# java -version java version "1.6.0_22" Java(TM) SE Runtime Environment (build 1.6.0_22-b04) Java HotSpot(TM) Client VM (build 17.1-b03, mixed mode, sharing) 修改.bashrc文件(当前用户有效) [root@javasrv src]# vi ~/.bashrc JAVA_HOME=/usr/java/default PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib:$CLASSPATH export PATH USER LOGNAME MAIL HOSTNAME HISTSIZE INPUTRC JAVA_HOME CLASSPATH 验证java环境 [root@javasrv src]# more HelloWorld.java /* HelloWorld.java */ public class HelloWorld { public static void main(String arg[]) { System.out.println("Hello, World!"); } } [root@javasrv src]# javac HelloWorld.java 编译生成的“HelloWorld.class” [root@javasrv src]# java HelloWorld //没有扩展名 Hello, World! 命令执行成功 |