Linux 上JDK 1.7 安装

下载linux版的JDK

1.上传至Linux,解压

[root@js usr]# mkdir /usr/java
[root@js usr]# tar -zxvp -f jdk-7-linux-x64.tar.gz /usr/java

2.配置环境变量

[root@js jdk1.7.0]# vim /etc/bashrc 

末尾加上

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

3.由于Linux自带openjdk，修改默认jdk

[root@js jdk1.7.0]# alternatives --install /usr/bin/java java /usr/java/jdk1.7.0/bin/java 300
[root@js jdk1.7.0]# alternatives --install /usr/bin/javac javac /usr/java/jdk1.7.0/bin/javac 300
[root@js jdk1.7.0]# alternatives --config java

There are 2 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
*+ 1           /usr/lib/jvm/jre-1.6.0-openjdk.x86_64/bin/java
   2           /usr/java/jdk1.7.0/bin/java

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

4.验证

[root@js jdk1.7.0]# java -version
java version "1.7.0"
Java(TM) SE Runtime Environment (build 1.7.0-b147)
Java HotSpot(TM) 64-Bit Server VM (build 21.0-b17, mixed mode)