Ubuntu 安装 jdk

最新推荐文章于 2025-06-24 13:21:05 发布

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最新推荐文章于 2025-06-24 13:21:05 发布

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分类专栏： Ubuntu 文章标签：虚拟机 jdk Ubuntu

本文链接：https://blog.youkuaiyun.com/CrazyingDays/article/details/25216521

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虚拟机版本 10.0

Ubuntu 版本 13.10

在没有安装jdk的时候，命令行输入 java -version，会出现

<span style="font-size:14px;">lpf@lpf-virtual-machine:~$ java -version
The program 'java' can be found in the following packages:
 * default-jre
 * gcj-4.6-jre-headless
 * gcj-4.7-jre-headless
 * openjdk-7-jre-headless
 * openjdk-6-jre-headless
Try: sudo apt-get install <selected package>
lpf@lpf-virtual-machine:~$ </span>

提示已经存在openjdk

1）安装openjdk

lpf@lpf-virtual-machine:~$ sudo apt-get install openjdk-7-jre-headless
[sudo] password for lpf:

......

Do you want to continue [Y/n]? y

......

2)检查安装是否成功

lpf@lpf-virtual-machine:~$ java -version
java version "1.7.0_55"
OpenJDK Runtime Environment (IcedTea 2.4.7) (7u55-2.4.7-1ubuntu1~0.13.10.1)
OpenJDK Client VM (build 24.51-b03, mixed mode, sharing)
lpf@lpf-virtual-machine:~$

3)设置 JAVA_HOME 环境变量

lpf@lpf-virtual-machine:~$ vi ~/.bashrc

文件末尾增加:

export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-i3856
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

保存退出

4)刷新配置文件

lpf@lpf-virtual-machine:~$ source ~/.bashrc

5)设置默认jdk

sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/java-7-openjdk-i386/bin/java 300

本来还应该执行下面的几行，但是一直报不存在的错误，不知道是不是openjdk的原因

sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/java-7-openjdk-i386/bin/javac 300
sudo update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/java-7-openjdk-i386/bin/jar 300 
sudo update-alternatives --install /usr/bin/javah javah /usr/lib/jvm/java-7-openjdk-i386/bin/javah 300 
sudo update-alternatives --install /usr/bin/javap javap /usr/lib/jvm/java-7-openjdk-i386/bin/javap 300

然后执行

sudo update-alternatives --config java

出现

lpf@lpf-virtual-machine:~$ sudo update-alternatives --config java 
There are 2 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                           Priority   Status
------------------------------------------------------------
* 0            /usr/lib/jvm/java-7-openjdk-i386/jre/bin/java   1071      auto mode
  1            /usr/lib/jvm/java-7-openjdk-i386/bin/java       300       manual mode
  2            /usr/lib/jvm/java-7-openjdk-i386/jre/bin/java   1071      manual mode

Press enter to keep the current choice[*], or type selection number: 1
update-alternatives: using /usr/lib/jvm/java-7-openjdk-i386/bin/java to provide /usr/bin/java (java) in manual mode

* 表示当前的默认JDK，可以看出是OpenJDK，序号1为之前设置的jdk，状态值300。输入1，选中jdk

也可以安装 sunjdk ，先下载

wget --no-check-certificate --no-cookies --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2Ftechnetwork%2Fjava%2Fjavase%2Fdownloads%2Fjdk7-downloads-1880260.html;" http://download.oracle.com/otn-pub/java/jdk/7u25-b15/jdk-7u25-linux-x64.tar.gz

wget -c http://download.oracle.com/otn-pub/java/jdk/7/jdk-7-linux-i586.tar.gz

接下来步骤一样。