linux的yum安装jdk

1.查看当前的jdk版本，并卸载

[root@localhost opt]#  rpm -qa|grep java java-1.6.0-openjdk-1.6.0.37-1.13.9.4.el5_11tzdata-java-2015g-1.el5//卸载[root@localhost opt]# rpm -e --allmatches --nodeps java-1.6.0-openjdk-1.6.0.37-1.13.9.4.el5_11[root@localhost opt]# rpm -e --allmatches --nodeps tzdata-java-2015g-1.el5

安装Jdk

1.查找java相关得列表

[root@localhost jre-1.6.0-openjdk.x86_64]# yum -y list java*Loaded plugins: fastestmirrorLoading mirror speeds from cached hostfile * addons: mirrors.btte.net * base: centos.ustc.edu.cn * extras: centos.ustc.edu.cn * updates: centos.ustc.edu.cnInstalled Packagesjava-1.6.0-openjdk.x86_64                                        1:1.6.0.37-1.13.9.4.el5_11                              installedAvailable Packagesjava-1.4.2-gcj-compat.x86_64                                     1.4.2.0-40jpp.115                                       base     java-1.4.2-gcj-compat-devel.i386                                 1.4.2.0-40jpp.115                                       base     java-1.4.2-gcj-compat-devel.x86_64                               1.4.2.0-40jpp.115                                       base     java-1.4.2-gcj-compat-javadoc.x86_64                             1.4.2.0-40jpp.115                                       base     java-1.4.2-gcj-compat-src.x86_64                                 1.4.2.0-40jpp.115                                       base     java-1.6.0-openjdk-demo.x86_64                                   1:1.6.0.37-1.13.9.4.el5_11                              updates  java-1.6.0-openjdk-devel.x86_64                                  1:1.6.0.37-1.13.9.4.el5_11                              updates  java-1.6.0-openjdk-javadoc.x86_64                                1:1.6.0.37-1.13.9.4.el5_11                              updates  java-1.6.0-openjdk-src.x86_64                                    1:1.6.0.37-1.13.9.4.el5_11                              updates  java-1.7.0-openjdk.x86_64                                        1:1.7.0.91-2.6.2.1.el5_11                               updates  java-1.7.0-openjdk-demo.x86_64                                   1:1.7.0.91-2.6.2.1.el5_11                               updates  java-1.7.0-openjdk-devel.x86_64                                  1:1.7.0.91-2.6.2.1.el5_11                               updates  java-1.7.0-openjdk-javadoc.x86_64                                1:1.7.0.91-2.6.2.1.el5_11                               updates  java-1.7.0-openjdk-src.x86_64                                    1:1.7.0.91-2.6.2.1.el5_11                               updates  java_cup.x86_64                                                  1:0.10-0.k.6jpp.1                                       base     java_cup-javadoc.x86_64                                          1:0.10-0.k.6jpp.1                                       base     java_cup-manual.x86_64                                           1:0.10-0.k.6jpp.1                                       base     javacc.x86_64                                                    4.0-3jpp.3                                              base     javacc-demo.x86_64                                               4.0-3jpp.3                                              base     javacc-manual.x86_64                                             4.0-3jpp.3                                              base

  或      

[root@localhost jre-1.6.0-openjdk.x86_64]# yum search jdkLoaded plugins: fastestmirrorLoading mirror speeds from cached hostfile * addons: mirrors.btte.net * base: centos.ustc.edu.cn * extras: centos.ustc.edu.cn * updates: centos.ustc.edu.cn========================================================== Matched: jdk ==========================================================java-1.6.0-openjdk.x86_64 : OpenJDK Runtime Environmentjava-1.6.0-openjdk-demo.x86_64 : OpenJDK Demosjava-1.6.0-openjdk-devel.x86_64 : OpenJDK Development Environmentjava-1.6.0-openjdk-javadoc.x86_64 : OpenJDK API Documentationjava-1.6.0-openjdk-src.x86_64 : OpenJDK Source Bundlejava-1.7.0-openjdk.x86_64 : OpenJDK Runtime Environmentjava-1.7.0-openjdk-demo.x86_64 : OpenJDK Demosjava-1.7.0-openjdk-devel.x86_64 : OpenJDK Development Environmentjava-1.7.0-openjdk-javadoc.x86_64 : OpenJDK API Documentationjava-1.7.0-openjdk-src.x86_64 : OpenJDK Source Bundlegnu-crypto-sasl-jdk1.4.x86_64 : Gnu Crypto SASL APIjakarta-commons-beanutils.x86_64 : Jakarta Commons BeanUtils Packagejakarta-commons-collections.x86_64 : Jakarta Commons Collections Packagejakarta-commons-launcher.x86_64 : The Launcher Component is designed to be a cross platform Java application launcher.ldapjdk.x86_64 : The Mozilla LDAP Java SDKldapjdk-javadoc.x86_64 : Javadoc for ldapjdkmockobjects-alt-jdk1.4.x86_64 : Mockable API for JDK 1.4mockobjects-jdk1.4.x86_64 : MockObjects for 1.4 JDK

2.安装jdk

[root@localhost ~]# yum install java-1.6.0-openjdk.x86_64 …… Total download size: 44 MIs this ok [y/N]: y

3.安装完成之后，验证

[root@localhost ~]# java -versionjava version "1.6.0_37"OpenJDK Runtime Environment (IcedTea6 1.13.9) (rhel-1.13.9.4.el5_11-x86_64)OpenJDK 64-Bit Server VM (build 23.25-b01, mixed mode)

4.通过yum默认安装的路径为

  /usr/lib/jvm

[root@localhost ~]# cd /usr/lib/jvm[root@localhost jvm]# lltotal 24drwxr-xr-x 3 root root 4096 Jan 12 20:01 java-1.6.0-openjdk-1.6.0.37.x86_64lrwxrwxrwx 1 root root   21 Jan 12 20:01 jre -> /etc/alternatives/jrelrwxrwxrwx 1 root root   27 Jan 12 20:01 jre-1.6.0 -> /etc/alternatives/jre_1.6.0lrwxrwxrwx 1 root root   38 Jan 12 20:01 jre-1.6.0-openjdk.x86_64 -> java-1.6.0-openjdk-1.6.0.37.x86_64/jrelrwxrwxrwx 1 root root   29 Jan 12 20:01 jre-openjdk -> /etc/alternatives/jre_openjdk

   

  如果机器上同时安装了多个jdk的话，java命令只能指向一个版本的jdk，为了在全局中方便修改jdk版本

   /etc/alternatives 的目录下面会有个java链接，指向默认需要执行的版本的jdk的bin/java 命令

[root@localhost jvm]# cd /etc/alternatives[root@localhost alternatives]# lltotal 204lrwxrwxrwx 1 root root 46 Jan 12 20:01 java -> /usr/lib/jvm/jre-1.6.0-openjdk.x86_64/bin/java

    而/etc/alternatives/java又会被软连接到/usr/bin/java

[root@localhost alternatives]# cd /usr/bin[root@localhost bin]# ll |grep javalrwxrwxrwx 1 root root         22 Jan 12 20:01 java -> /etc/alternatives/java

 5.将jdk的安装路径加入到JAVA_HOME

   方法一：

[root@localhost bin]# vi /etc/profile

   在文件最后加入：

#set java environmentJAVA_HOME=/usr/lib/jvm/jre-1.6.0-openjdk.x86_64PATH=$PATH:$JAVA_HOME/binCLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jarexport JAVA_HOME CLASSPATH PATH

  修改/etc/profile之后让其生效

[root@localhost alternatives]# . /etc/profile

  注意 . 之后应有一个空格

方法二：

   或者是安装上面创建java命令的形式，以方便修改

[root@localhost jvm]# cd /etc/alternatives[root@localhost alternatives]# ln -s /usr/lib/jvm/jre-1.6.0-openjdk.x86_64/ java_home

  创建一个/etc/alternatives/java_home的软连接，将该连接指向到当前Jdk的根目录

    然后将改连接的路径加进去

#set java environmentJAVA_HOME=/etc/alternatives/java_homePATH=$PATH:$JAVA_HOME/binCLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jarexport JAVA_HOME CLASSPATH PATH

[root@localhost alternatives]# export |grep JAVA_HOMEdeclare -x JAVA_HOME="/etc/alternatives/java_home"