【轉(zhuǎn)】http://blog.csdn.net/lipengshuai0507/article/details/17020131

1.首先下載最新版 jdk 64-bit版 (jdk-7u45-linux-x64.tar.gz)

從官網(wǎng)下載http://www.Oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html

2.將jdk-7u45-linux-x64.tar.gz拷貝到/usr/lib/jvm/目錄下面，這里如果沒有jdk文件夾，則創(chuàng)建該文件夾,命令: sudo mkdir jvm //創(chuàng)建文件夾jdk sudo cp -r ~/download/jdk-7u45-linux-x64.tar.gz /usr/lib/jvm/ //把下載的文件拷貝到新創(chuàng)建的目錄下面 sudo tar -zxvg jdk-7u45-linux-x64.tar.gz //解壓縮文件3.設置環(huán)境變量，用nano打開/etc/PRofile文件 sudo nano /etc/profile 在文件的最后面增加： export JAVA_HOME=/usr/lib/jvm/jdk1.7.0_45 export JRE_HOME=/usr/lib/jvm/jdk1.7.0_45/jre export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH export CLASSPATH=$CLASSPATH:.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib4.將系統(tǒng)默認的jdk修改過來 $ sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7.0_45/bin/java 300 $ sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.7.0_45/bin/javac 300 $ sudo update-alternatives --config java $ sudo update-alternatives --config javac5.檢測，輸入java -version java version "1.7.0_45" Java(TM) SE Runtime Environment (build 1.7.0_45-b18) Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)