因为项目需要, 所以要在机器上安装Java1.7环境.
1, 去http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html 下载, 选择了Accept License Agreement
选择了Linux x64的jdk-7u71-linux-x64.tar.gz
2, #接下来找个目录来放sun JDK, 这里我们放到/usr/java, 并且以数字来表明版本,比如java8 就在/usr/java/java8, java7就在/usr/java/java7
创建/usr/java 目录, 然后解压压缩包, 移到/usr/java/java7
- #mkdir /usr/java && tar -zxvf jdk-7u71-linux-x64.tar.gz && mv jdk1.7.0_71 /usr/java/java7
3,写java的环境变量
用编辑器打开你的.bashrc文件. 这个有两个, 一个在/root/.bashrc ,一个在/home/你的username/.bashrc (不写/etc/environment 是不想影响全局系统环境变量)
加入下面的内容然后保存下.
- export JAVA_HOME=/usr/java/java7
- export CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar
- export PATH=$PATH:$JAVA_HOME/bin
接着
- #source /root/.bashrc 切到你的用户下再source下即可.
- #echo $JAVA_HOME
- /usr/java/java7
对于没有安装过openjdk的, 这时在终端直接输入
- #/usr/java/java7/bin/java -version
- #update-alternatives --install /usr/bin/java java /usr/java/java7/bin/java 1100
- #update-alternatives --install /usr/bin/javac javac /usr/java/java7/bin/javac 1100
#update-alternatives --config java
#update-alternatives --config javac
- root@debian:/# update-alternatives --config java
- There are 2 choices for the alternative java (providing /usr/bin/java).
- Selection Path Priority Status
- ------------------------------------------------------------
- 0 /usr/java/java7/bin/java 1100 auto mode
- * 1 /usr/java/java7/bin/java 1100 manual mode
- 2 /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java 1061 manual mode
- root@debian:/# update-alternatives --config javac
- There are 2 choices for the alternative javac (providing /usr/bin/javac).
- Selection Path Priority Status
- ------------------------------------------------------------
- * 0 /usr/java/java7/bin/javac 1100 auto mode
- 1 /usr/java/java7/bin/javac 1100 manual mode
- 2 /usr/lib/jvm/java-6-openjdk-amd64/bin/javac 1061 manual mode
然后直接在终端输入验证下java7是否安装ok
#java -version
- java version "1.7.0_71"
- Java(TM) SE Runtime Environment (build 1.7.0_71-b14)
- Java HotSpot(TM) 64-Bit Server VM (build 24.71-b01, mixed mode)