Linux JKD 安装的基本操作及常见错误

朴灿烈づ我的快乐病毒、 2022-04-15 02:49 248阅读 0赞

*  **JKD下载：[JAVA SE 7(JDK1.7)][JAVA SE 7_JDK1.7]**
 *  **选择Linux 的 JDK版本**
 *  **查看JDK安装路径：whereis jdk**
 *  **查看Java执行路径：which Java**
 *  **确定jdk版本：rpm -qa | grep jdk**
 *  **卸载旧版本jdk：yum -y remove jdk-1.7.0\_80-fcs.x86\_64**
 *  **给用户赋予权限：chmod +x jdk-7u80-linux-x64.rpm**

![20181120172941237.png][]

![20181120173059571.png][]

*  **安装JDK：rpm -ihv jdk-7u80-linux-x64.rpm**

![20181120172852287.png][]

*  **JDK的默认安装路径：/usr/java**

![20181120173144742.png][]

*  **查看版本：java -version**

![20181120173326985.png][]

*  **配置环境变量：vim /etc/profile**

export JAVA\_HOME=/usr/java/jdk1.7.0\_80  
export JRE\_HOME=$\{JAVA\_HOME\}/jre  
export PATH=$PATH:$\{JAVA\_HOME\}/bin:$\{JRE\_HOME\}/bin  
export CLASSPATH=.:$\{JAVA\_HOME\}/lib/dt.jar:$\{JAVA\_HOME\}/lib/tools.jar:$\{JRE\_HOME\}/lib

*  **强制退出并保存：;wq!**
 *  **让资源立即生效：source /etc/profile**
 *  **输入javac就即可看到是否安装成功**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FkX2x5dA_size_16_color_FFFFFF_t_70][]

*  **echo $PATH可查看环境变量是否配置成功，若原来安装过jdk，此时查看到的环境变量可能还是旧版本的，需到阿里云重启实例即可**

![20181120173451270.png][]

*  **安装多个版本jdk：--install /usr/bin/java java /usr/java/jdk1.7.0\_80/bin/java 3**

![20181218162058975.PNG][]

*  **多个版本jdk之间的切换：alternatives --config java**

![20181218162220760.PNG][]

[JAVA SE 7_JDK1.7]: https://www.oracle.com/technetwork/java/javase/downloads/java-archive-downloads-javase7-521261.html#jdk-7u80-oth-JPR
[20181120172941237.png]: /images/20220415/a30bf6c602524b2a8bf10e9da62282a4.png
[20181120173059571.png]: /images/20220415/a83a4f87483f4edd96a1a29d8fbe1ca1.png
[20181120172852287.png]: /images/20220415/7f6fad511b834b678d3b80504c6d538c.png
[20181120173144742.png]: /images/20220415/bfdec31c8f23490e936ee7e0babd6b20.png
[20181120173326985.png]: /images/20220415/204dfb37e2434eeb96c48bb387f7b7b9.png
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[20181120173451270.png]: /images/20220415/da9a0309bcb44312b799dde569e52053.png
[20181218162058975.PNG]: /images/20220415/d62a455b9bc843c7b24ce3b79c07ee7a.png
[20181218162220760.PNG]: /images/20220415/19a0b7f38d3844b8b6bc7aaaf0549458.png