jdk下载地址 http://download.Oracle.com/otn-pub/java/jdk/7/jdk-7-linux-i586.tar.gz我把jdk安装到/opt/java,所以在Terminal窗口里执行下面的代码:sudo mkdir /opt/javasudo tar zxvf jdk-7-linux-i586.tar.gz -C/opt/java1. 用编辑器打开 /etc/environmentgedit /etc/environment2. 修改文件PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:usr/games:${JAVA_HOME}/bin"JAVA_HOME=/opt/java/jdk1.7.0JRE_HOME=${JAVA_HOME}/jreCLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib"3.打开bashrc文件sudo gedit ~/.bashrc4.添加如下代码export JAVA_HOME=/opt/java/jdk1.7.0export JRE_HOME=${JAVA_HOME}/jreexport CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/libexport PATH=${JAVA_HOME}/bin:$PATH5. 重新加载bashrcsource ~/.bashrc6. 配置默认JDK版本:由于Ubuntu中可能会有默认的JDK,如openjdk,所以,为了将我们安装的JDK设置为默认JDK版本,还要进行下面的配置:sudo update-alternatives --install /usr/bin/java java /opt/java/jdk1.7.0/bin/java 300sudo update-alternatives --install /usr/bin/javac javac /opt/java/jdk1.7.0/bin/javac 300sudo update-alternatives --install /usr/bin/jar jar /opt/java/jdk1.7.0/bin/jar 300sudo update-alternatives --install /usr/bin/javah javah /opt/java/jdk1.7.0/bin/javah 300sudo update-alternatives --install /usr/bin/javap javap /opt/java/jdk1.7.0/bin/javap 3007.然后执行:sudo update-alternatives --config javasudo update-alternatives --config javacsudo update-alternatives --config jar8.检测环境是否配好java -versionjava version "1.7.0"Java(TM) SE Runtime Environment (build 1.7.0-b147)Java HotSpot(TM) Server VM (build 21.0-b17, mixed mode)
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