1.到oracle官网下载jdk安装包
2.修改安装包的权限 chmod u+x jdk-xxxx.bin 或者 chmod u+x jdk-xxx.tar.gz
3. 如果是bin文件,直接执行 ./jdk-xxx.bin
如果是tar.gz文件,解压 sudo tar zxvf ./jdk-xxx.tar.gz
4.配置环境变量
vim ~/.bashrc
在文件末尾添加
export JAVA_HOME=/opt/software/jdk1.x
export CLASSPATH=.$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$JAVA_HOME}/bin:$PATH
保存,退出
5.让环境变量立即生效
source ~/.bashrc
6.验证jdk安装是否成功
java -version
7. 设置ubuntu的默认jdk,原因使因为ubuntu默认有openjdk:
Install new java source in system:
sudo update-alternatives --install /usr/bin/javac javac /opt/software/jdk1.x/bin/javac 1
sudo update-alternatives --install /usr/bin/java java /opt/software/jdk1.x/bin/java 1
sudo update-alternatives --install /usr/bin/javaws javaws /opt/software/jdk1.x/bin/javaws 1
Choose default java:
sudo update-alternatives --config javac
sudo update-alternatives --config java
sudo update-alternatives --config javaws
选择对应的jdk编号,回车