下载地址:http://www.oracle.com/technetwork/java/javase/downloads/java-se-jdk-7-download-432154.html
1. 安装JDK1.7.0
下载完成后在取得root权限后执行:
[root@xxx]#sudo rpm -ivh /目录/jdk-7-linux-x64.rpm
执行结果:
1:jdk ##################################### [100%]
Unpacking JAR files...
rt.jar...
jsse.jar...
charsets.jar...
tools.jar...
localedata.jar...
2. 设置环境变量
#vim /etc/profile
在profile文件下面追加写入下面信息:
export JAVA_HOME=/usr/java/jdk1.7.0
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin
保存退出,执行:
#source /etc/profile
3. 更新 alternatives,选择JDK版本
现在在用 #Java -version 查看JDK版本还是6.0。这时我们需要选择本机安装过的JDK7。
首先安装 java alternative ---jdk
#update-alternatives --install /usr/bin/java java /usr/java/jdk1.7.0/bin/java 60
然后配置JDK:
#update-alternatives --config java
#update-alternatives --install /usr/bin/java java /usr/java/jdk1.7.0/bin/java 60
然后配置JDK:
#update-alternatives --config java
这样就会出现下面的提示:
共有 3 个程序提供“java”。
选择 命令
-----------------------------------------------
*+ 1 /usr/lib/jvm/jre-1.6.0-openjdk/bin/java
2 /usr/lib/jvm/jre-1.5.0-gcj/bin/java
3 /usr/java/jdk1.7.0/bin/java
2 /usr/lib/jvm/jre-1.5.0-gcj/bin/java
3 /usr/java/jdk1.7.0/bin/java
选择/usr/java/jdk1.7.0/bin/java
//按 Enter 来保存当前选择[+],或键入选择号码:3
CentOS 6.0下面安装JDK7就完成了。在看看你的JDK版本
#java -version
java version "1.7.0"
Java(TM) SE Runtime Environment (build 1.7.0-b147)
Java HotSpot(TM) Client VM (build 21.0-b17, mixed mode, sharing)
java version "1.7.0"
Java(TM) SE Runtime Environment (build 1.7.0-b147)
Java HotSpot(TM) Client VM (build 21.0-b17, mixed mode, sharing)
当然javac 版本也需要更新:
1>:安装:
update-alternatives --install /usr/bin/javac javac /usr/local/bin/jdk1.7.0_75/bin/javac 300
2:对javac进行配置:
#update-alternatives --config javac
There are 2 alternatives which provide `javac'.
Selection Alternative
-----------------------------------------------
+ 1 /usr/local/bin/jdk1.6.0_45/bin/javac
* 2 /usr/local/bin/jdk1.7.0_75/bin/javac
There are 2 alternatives which provide `javac'.
Selection Alternative
-----------------------------------------------
+ 1 /usr/local/bin/jdk1.6.0_45/bin/javac
* 2 /usr/local/bin/jdk1.7.0_75/bin/javac