Java安装与配置 到Sun网站下载自解压安装包jdk-1_5_0_06-nb-4_1-linux-ml.bin 安装: [root@RHEL4 JDK-1.5.0.06]# chmod +x jdk-1_5_0_06-nb-4_1-linux-ml.bin [root@RHEL4 JDK-1.5.0.06]# ./jdk-1_5_0_06-nb-4_1-linux-ml.bin 选择安装位置, NetBeans安装目录: /opt/netbeans-4.1 J2SDK安装目录: /opt/jdk1.5.0_06 配置Java环境变量: 在 ~/.bash_profile 里加入下列几行环境变量即可: export JAVA_HOME=/opt/jdk1.5.0_06 export PATH=$PATH:$JAVA_HOME/bin export MANPATH=$JAVA_HOME/man export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/jre/lib/rt.jar 然后执行下列操作: mv /usr/bin/java /usr/bin/java.bak ln -s /opt/jdk1.5.0_06/bin/java /usr/bin/java 注销当前用户,重新登录。 下面验证Java环境变量是否生效: [root@RHEL4 ~]# echo $JAVA_HOME /opt/jdk1.5.0_06 [root@RHEL4 ~]# echo $CLASSPATH .:/opt/jdk1.5.0_06/lib/dt.jar:/opt/jdk1.5.0_06/lib/tools.jar:/opt/jdk1.5.0_06/jre/lib/rt.jar [root@RHEL4 ~]# echo $PATH /usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin:/.