Centos中yum方式安装java的实现示例
查看CentOS自带JDK是否已安装
[root@test~]#yumlistinstalled|grepjava
若有自带安装的JDK，应如下操作进行卸载CentOS系统自带Java环境
[root@test~]#java-version javaversion"1.7.0_181" OpenJDKRuntimeEnvironment(rhel-2.6.14.8.el6_9-x86_64u181-b00) OpenJDK64-BitServerVM(build24.181-b00,mixedmode) [root@test~]#yum-yremovejava-1.7.0-openjdk* [root@test~]#yum-yremovetzdata-java.noarch [root@test~]#java--version -bash:/usr/bin/java:Nosuchfileordirectory
查看yum库中的Java安装包
[root@test~]#yum-ylistjava* Loadedplugins:fastestmirror Loadingmirrorspeedsfromcachedhostfile *base:centos.ustc.edu.cn *extras:centos.ustc.edu.cn *updates:centos.ustc.edu.cn base|3.7kB00:00 extras|3.4kB00:00 updates|3.4kB00:00 AvailablePackages java-1.5.0-gcj.x86_641.5.0.0-29.1.el6base java-1.5.0-gcj-devel.x86_641.5.0.0-29.1.el6base java-1.5.0-gcj-javadoc.x86_641.5.0.0-29.1.el6base java-1.5.0-gcj-src.x86_641.5.0.0-29.1.el6base java-1.6.0-openjdk.x86_641:1.6.0.40-1.13.12.6.el6_8updates java-1.6.0-openjdk-demo.x86_641:1.6.0.40-1.13.12.6.el6_8updates java-1.6.0-openjdk-devel.x86_641:1.6.0.40-1.13.12.6.el6_8updates java-1.6.0-openjdk-javadoc.x86_641:1.6.0.40-1.13.12.6.el6_8updates java-1.6.0-openjdk-src.x86_641:1.6.0.40-1.13.12.6.el6_8updates java-1.7.0-openjdk.x86_641:1.7.0.111-2.6.7.2.el6_8updates java-1.7.0-openjdk-demo.x86_641:1.7.0.111-2.6.7.2.el6_8updates java-1.7.0-openjdk-devel.x86_641:1.7.0.111-2.6.7.2.el6_8updates java-1.7.0-openjdk-javadoc.noarch1:1.7.0.111-2.6.7.2.el6_8updates java-1.7.0-openjdk-src.x86_641:1.7.0.111-2.6.7.2.el6_8updates java-1.8.0-openjdk.x86_641:1.8.0.101-3.b13.el6_8updates java-1.8.0-openjdk-debug.x86_641:1.8.0.101-3.b13.el6_8updates java-1.8.0-openjdk-demo.x86_641:1.8.0.101-3.b13.el6_8updates java-1.8.0-openjdk-demo-debug.x86_641:1.8.0.101-3.b13.el6_8updates java-1.8.0-openjdk-devel.x86_641:1.8.0.101-3.b13.el6_8updates java-1.8.0-openjdk-devel-debug.x86_641:1.8.0.101-3.b13.el6_8updates java-1.8.0-openjdk-headless.x86_641:1.8.0.101-3.b13.el6_8updates java-1.8.0-openjdk-headless-debug.x86_641:1.8.0.101-3.b13.el6_8updates java-1.8.0-openjdk-javadoc.noarch1:1.8.0.101-3.b13.el6_8updates java-1.8.0-openjdk-javadoc-debug.noarch1:1.8.0.101-3.b13.el6_8updates java-1.8.0-openjdk-src.x86_641:1.8.0.101-3.b13.el6_8updates java-1.8.0-openjdk-src-debug.x86_641:1.8.0.101-3.b13.el6_8updates java_cup.x86_641:0.10k-5.el6base java_cup-javadoc.x86_641:0.10k-5.el6base java_cup-manual.x86_641:0.10k-5.el6base javacc.x86_644.1-0.5.el6base javacc-demo.x86_644.1-0.5.el6base javacc-manual.x86_644.1-0.5.el6base javassist.noarch3.9.0-6.el6base javassist-javadoc.noarch3.9.0-6.el6base
以yum库中java-1.8.0为例,"*"表示将java-1.8.0的所有相关Java程序都安装上
[root@test~]#yum-yinstalljava-1.8.0-openjdk*
查看刚安装的Java版本信息。
输入："java-version"可查看Java版本
输入："javac"可查看Java的编译器命令用法
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