__都非拉得的博客

Posted on 04 Jun 2015

下载并解压JDK

  http://www.oracle.com/technetwork/cn/java/javase/downloads/index.html

移动JDK
```
  # mv jdk1.8.0_20 /usr/local
```

设置JDK环境变量

  # vi /etc/profile

  export JAVA_HOME=/usr/local/jdk1.8.0_20
  export JRE_HOME=${JAVA_HOME}/jre
  export CLASSPATH=.:{$JAVA_HOME}/lib:{$JRE_HOME}/lib
  export PATH=${JAVA_HOME}/bin:$PATH

  # source /etc/profile # 立即生效

设置默认

  sudo update-alternatives --install /usr/bin/java java  /usr/local/jdk1.8.0_20/bin/java  300
  sudo update-alternatives --install /usr/bin/javac javac  /usr/local/jdk1.8.0_20/bin/javac  300

验证

  sudo update-alternatives --display java # 查看信息默认的jdk信息

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