CentOS上yum安装JDK

1. 查找java相关得列表[qyf@localhost ~]$ yum -y list java*执行结果[qyf@localhost ~]$ yum -y list java*Loaded plugins: fastestmirrorbase | 1.1 kB 00:00base/primary | 995 kB 00:00base 2789/2789extras | 2.1 kB 00:00extras/primary_db | 164 kB 00:20updates | 1.9 kB 00:00updates/primary_db | 422 kB 00:01Available Packagesjava-1.4.2-gcj-compat.i386 1.4.2.0-40jpp.115 basejava-1.4.2-gcj-compat-devel.i386 1.4.2.0-40jpp.115 basejava-1.4.2-gcj-compat-javadoc.i386 1.4.2.0-40jpp.115 basejava-1.4.2-gcj-compat-src.i386 1.4.2.0-40jpp.115 basejava-1.6.0-openjdk.i386 1:1.6.0.0-5.1.13.3.el5_10 updatesjava-1.6.0-openjdk-demo.i386 1:1.6.0.0-5.1.13.3.el5_10 updatesjava-1.6.0-openjdk-devel.i386 1:1.6.0.0-5.1.13.3.el5_10 updatesjava-1.6.0-openjdk-javadoc.i386 1:1.6.0.0-5.1.13.3.el5_10 updatesjava-1.6.0-openjdk-src.i386 1:1.6.0.0-5.1.13.3.el5_10 updatesjava-1.7.0-openjdk.i386 1:1.7.0.55-2.4.7.1.el5_10 updatesjava-1.7.0-openjdk-demo.i386 1:1.7.0.55-2.4.7.1.el5_10 updatesjava-1.7.0-openjdk-devel.i386 1:1.7.0.55-2.4.7.1.el5_10 updatesjava-1.7.0-openjdk-javadoc.i386 1:1.7.0.55-2.4.7.1.el5_10 updatesjava-1.7.0-openjdk-src.i386 1:1.7.0.55-2.4.7.1.el5_10 updatesjava_cup.i386 1:0.10-0.k.6jpp.1 basejava_cup-javadoc.i386 1:0.10-0.k.6jpp.1 basejava_cup-manual.i386 1:0.10-0.k.6jpp.1 basejavacc.i386 4.0-3jpp.3 basejavacc-demo.i386 4.0-3jpp.3 basejavacc-manual.i386 4.0-3jpp.3 base2. 使用root用户安装安装时提醒必须使用root用户，sudo都不行。[qyf@localhost ~]$ yum -y install java-1.6.0-openjdk*执行结果[qyf@localhost ~]$ yum -y install java-1.6.0-openjdk*Loaded plugins: fastestmirrorLoading mirror speeds from cached hostfile* base: mirror.bit.edu.cn* extras: mirror.bit.edu.cn* updates: centos.ustc.edu.cnbase | 1.1 kB 00:00base/primary | 995 kB 00:07base 2789/2789extras | 2.1 kB 00:00extras/primary_db | 164 kB 00:02updates | 1.9 kB 00:00updates/primary_db | 422 kB 00:07Setting up Install ProcessResolving Dependencies--> Running transaction check---> Package java-1.6.0-openjdk.i386 1:1.6.0.0-5.1.13.3.el5_10 set to be updated--> Processing Dependency: jpackage-utils >= 1.7.3-1jpp.2 for package: java-1.6.0-openjdk--> Processing Dependency: libgif.so.4 for package: java-1.6.0-openjdk--> Processing Dependency: tzdata-java for package: java-1.6.0-openjdk---> Package java-1.6.0-openjdk-demo.i386 1:1.6.0.0-5.1.13.3.el5_10 set to be updated---> Package java-1.6.0-openjdk-devel.i386 1:1.6.0.0-5.1.13.3.el5_10 set to be updated---> Package java-1.6.0-openjdk-javadoc.i386 1:1.6.0.0-5.1.13.3.el5_10 set to be updated---> Package java-1.6.0-openjdk-src.i386 1:1.6.0.0-5.1.13.3.el5_10 set to be updated--> Running transaction check---> Package giflib.i386 0:4.1.3-7.3.3.el5 set to be updated---> Package jpackage-utils.noarch 0:1.7.3-1jpp.3.el5 set to be updated---> Package tzdata-java.i386 0:2014b-1.el5 set to be updated--> Finished Dependency ResolutionDependencies Resolved================================================================================Package Arch Version RepositorySize================================================================================Installing:java-1.6.0-openjdk i386 1:1.6.0.0-5.1.13.3.el5_10 updates 44 Mjava-1.6.0-openjdk-demo i386 1:1.6.0.0-5.1.13.3.el5_10 updates 2.2 Mjava-1.6.0-openjdk-devel i386 1:1.6.0.0-5.1.13.3.el5_10 updates 15 Mjava-1.6.0-openjdk-javadoc i386 1:1.6.0.0-5.1.13.3.el5_10 updates 20 Mjava-1.6.0-openjdk-src i386 1:1.6.0.0-5.1.13.3.el5_10 updates 39 MInstalling for dependencies:giflib i386 4.1.3-7.3.3.el5 base 39 kjpackage-utils noarch 1.7.3-1jpp.3.el5 base 60 ktzdata-java i386 2014b-1.el5 updates 172 kTransaction Summary================================================================================Install 8 Package(s)Upgrade 0 Package(s)Total download size: 120 MDownloading Packages:(1/8): giflib-4.1.3-7.3.3.el5.i386.rpm | 39 kB 00:00(2/8): jpackage-utils-1.7.3-1jpp.3.el5.noarch.rpm | 60 kB 00:00(3/8): tzdata-java-2014b-1.el5.i386.rpm | 172 kB 00:04(4/8): java-1.6.0-openjdk-demo-1.6.0.0-5.1.13.3.el5_10.i386.rpm | 2.2 MB 00:47(5/8): java-1.6.0-openjdk-devel-1.6.0.0-5.1.13.3.el5_10.i386.rpm | 15 MB 04:25(6/8): java-1.6.0-openjdk-javadoc-1.6.0.0-5.1.13.3.el5_10.i386.rpm (17%) 19% [============ ] 81 kB/s | 3.8 MB 03:19 ETA最后一行就是在下载jdk了，这里我们安装jdk1.6相关得全部包。3. 确认是否安装成功[qyf@localhost ~]$ java -version执行结果[qyf@localhost ~]$ java -versionjava version "1.6.0_30"OpenJDK Runtime Environment (IcedTea6 1.13.3) (rhel-5.1.13.3.el5_10-i386)OpenJDK Client VM (build 23.25-b01, mixed mode)正确显示了jdk版本信息就说明安装成功了。4. 默认情况下jdk安装得路径/usr/lib/jvm由于我们得机器可能同时安装好几个版本得jdk，所以在/etc/alternatives目录下会有一个java链接到具体的java命令。而这个/etc/alternatives/java会被/usr/bin/java链接。从而java命令就被设置到了shell环境中。