环境
linux版本:centos 6.5、ubuntu 12.04.5
jdk版本:jdk 1.7
目录
方法一:手动解压jdk的压缩包,然后设置环境变量
方法二:用yum安装jdk
方法三:用rpm安装jdk
方法四:ubuntu 上使用apt-get安装jdk
内容
方法一:手动解压jdk的压缩包,然后设置环境变量
1.在/usr/目录下创建java目录
[root@localhost ~]# mkdir/usr/java [root@localhost ~]# cd /usr/java
2.下载,然后解压
[root@localhost java]# curl -o http://download.oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-x64.tar.gz [root@localhost java]# tar -zxvf jdk-7u79-linux-x64.tar.gz
3.设置环境变量
[root@localhost java]# vi /etc/profile
添加如下内容:
#set java environment java_home=/usr/java/jdk1.7.0_79 jre_home=/usr/java/jdk1.7.0_79/jre class_path=.:$java_home/lib/dt.jar:$java_home/lib/tools.jar:$jre_home/lib path=$path:$java_home/bin:$jre_home/bin export java_home jre_home class_path path
让修改生效:
[root@localhost java]# source /etc/profile
4.验证
[root@localhost java]# java -version java version "1.7.0_79" java(tm) se runtime environment (build 1.7.0_79-b15) java hotspot(tm) 64-bit server vm (build 24.79-b02, mixed mode)
方法二:用yum安装jdk(centos)
1.查看yum库中都有哪些jdk版本
[root@localhost ~]# yum search java|grep jdk ldapjdk-javadoc.x86_64 : javadoc for ldapjdk java-1.6.0-openjdk.x86_64 : openjdk runtime environment java-1.6.0-openjdk-demo.x86_64 : openjdk demos java-1.6.0-openjdk-devel.x86_64 : openjdk development environment java-1.6.0-openjdk-javadoc.x86_64 : openjdk api documentation java-1.6.0-openjdk-src.x86_64 : openjdk source bundle java-1.7.0-openjdk.x86_64 : openjdk runtime environment java-1.7.0-openjdk-demo.x86_64 : openjdk demos java-1.7.0-openjdk-devel.x86_64 : openjdk development environment java-1.7.0-openjdk-javadoc.noarch : openjdk api documentation java-1.7.0-openjdk-src.x86_64 : openjdk source bundle java-1.8.0-openjdk.x86_64 : openjdk runtime environment java-1.8.0-openjdk-demo.x86_64 : openjdk demos java-1.8.0-openjdk-devel.x86_64 : openjdk development environment java-1.8.0-openjdk-headless.x86_64 : openjdk runtime environment java-1.8.0-openjdk-javadoc.noarch : openjdk api documentation java-1.8.0-openjdk-src.x86_64 : openjdk source bundle ldapjdk.x86_64 : the mozilla ldap java sdk
2.选择版本,进行安装,我们这里安装1.7版本
[root@localhost ~]# yum install java-1.7.0-openjdk
安装完之后,默认的安装目录是在: /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.75.x86_64
3.设置环境变量
[root@localhost ~]# vi /etc/profile
添加如下内容:
#set java environment java_home=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.75.x86_64 jre_home=$java_home/jre class_path=.:$java_home/lib/dt.jar:$java_home/lib/tools.jar:$jre_home/lib path=$path:$java_home/bin:$jre_home/bin export java_home jre_home class_path path
让修改生效:
[root@localhost java]# source /etc/profile
3.验证 同上。
注:因为采用yum安装jdk,系统考虑到多版本的问题,会用alternatives进行版本控制。开始,相应版本的jdk安装在/usr/lib/jvm/之后,会在alternatives中注册,在/etc/alternatives目录下会产生一些链接到/usr/lib/jvm/中刚安装好的jdk版本。
在/usr/bin下面会有链接到/etc/alternatives的相应的文件。比如,/usr/bin下面会有一个链接文件java的映射关系如下:
/usr/bin/java->/etc/alternatives/java /etc/alternatives/java-> /usr/lib/jvm/jre-1.7.0-openjdk.x86_64/bin/java
这样,java命令不用设置环境变量,就可以正常运行了。但如果对于tomcat或其他软件来说还是要设置环境变量。
同样,如果安装新的版本jdk,就会重新链接到最新安装的jdk版本。当然,也可以使用alternatives修改所要使用的版本。
具体方法可参照:《使用linux的alternatives管理多版本的软件》
方法三:用rpm安装jdk
1.下载
[hadoop@localhost ~]$ curl -o http://download.oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-x64.rpm
2.使用rpm命令安装
[root@localhost ~]# rpm -ivh jdk-7u79-linux-x64.rpm preparing... ########################################### [100%] 1:jdk ###########################################[100%] unpacking jar files... rt.jar... jsse.jar... charsets.jar... tools.jar... localedata.jar... jfxrt.jar...
3.设置环境变量
[root@localhost java]# vi /etc/profile
添加如下内容:
#set java environment java_home=/usr/java/jdk1.7.0_79 jre_home=/usr/java/jdk1.7.0_79/jre class_path=.:$java_home/lib/dt.jar:$java_home/lib/tools.jar:$jre_home/lib path=$path:$java_home/bin:$jre_home/bin export java_home jre_home class_path path
让修改生效:
[root@localhost java]# source /etc/profile
4.验证
[root@localhost java]# java -version java version "1.7.0_79" java(tm) se runtime environment (build 1.7.0_79-b15) java hotspot(tm) 64-bit server vm (build 24.79-b02, mixed mode)
和yum安装类似,不用设置环境变量就可以,运行java命令。rpm安装方式默认会把jdk安装到/usr/java/jdk1.7.0_79,然后通过三层链接,链接到/usr/bin,具体链接如下:
[root@localhost ~]# cd /bin [root@localhost bin]# ll|grep java lrwxrwxrwx. 1 root root 25 mar 28 11:24 jar ->/usr/java/default/bin/jar lrwxrwxrwx. 1 root root 26 mar 28 11:24 java -> /usr/java/default/bin/java lrwxrwxrwx. 1 root root 27 mar 28 11:24 javac ->/usr/java/default/bin/javac lrwxrwxrwx. 1 root root 29 mar 28 11:24 javadoc ->/usr/java/default/bin/javadoc lrwxrwxrwx. 1 root root 28 mar 28 11:24 javaws ->/usr/java/default/bin/javaws lrwxrwxrwx. 1 root root 30 mar 28 11:24 jcontrol ->/usr/java/default/bin/jcontrol [root@localhost bin]# cd /usr/java/ [root@localhost java]# ll total 4 lrwxrwxrwx. 1 root root 16 mar 28 11:24 default-> /usr/java/latest drwxr-xr-x. 8 root root 4096 mar 28 11:24 jdk1.7.0_79 lrwxrwxrwx. 1 root root 21 mar 28 11:24 latest -> /usr/java/jdk1.7.0_79
方法四:ubuntu 上使用apt-get安装jdk
1.查看apt库都有哪些jdk版本
root@itble:~# apt-cache search java|grep jdk default-jdk - standard java or java compatible development kit default-jdk-doc - standard java or java compatible development kit (documentation) gcj-4.6-jdk - gcj and classpath development tools for java(tm) gcj-jdk - gcj and classpath development tools for java(tm) openjdk-6-dbg - java runtime based on openjdk (debugging symbols) openjdk-6-demo - java runtime based on openjdk (demos and examples) openjdk-6-doc - openjdk development kit (jdk) documentation openjdk-6-jdk - openjdk development kit (jdk) openjdk-6-jre-lib - openjdk java runtime (architecture independent libraries) openjdk-6-source - openjdk development kit (jdk) source files openjdk-7-dbg - java runtime based on openjdk (debugging symbols) openjdk-7-demo - java runtime based on openjdk (demos and examples) openjdk-7-doc - openjdk development kit (jdk) documentation openjdk-7-jdk - openjdk development kit (jdk) openjdk-7-source - openjdk development kit (jdk) source files uwsgi-plugin-jvm-openjdk-6 - java plugin for uwsgi (openjdk 6) uwsgi-plugin-jwsgi-openjdk-6 - jwsgi plugin for uwsgi (openjdk 6) openjdk-6-jre - openjdk java runtime, using hotspot jit openjdk-6-jre-headless - openjdk java runtime, using hotspot jit (headless) openjdk-7-jre - openjdk java runtime, using hotspot jit openjdk-7-jre-headless - openjdk java runtime, using hotspot jit (headless) openjdk-7-jre-lib - openjdk java runtime (architecture independent libraries)
2.选择版本进行安装
root@itble:~# apt-get install openjdk-7-jdk
3.设置环境变量
root@itble:~# vi /etc/profile
添加如下内容:
#set java environment java_home=/usr/lib/jvm/java-1.7.0-openjdk-amd64 jre_home=$java_home/jre class_path=.:$java_home/lib/dt.jar:$java_home/lib/tools.jar:$jre_home/lib path=$path:$java_home/bin:$jre_home/bin export java_home jre_home class_path path
让修改生效:
root@itble:~# source /etc/profile
4.验证
root@itble:~# java -version java version "1.7.0_79" openjdk runtime environment (icedtea 2.5.5) (7u79-2.5.5-0ubuntu0.12.04.1) openjdk 64-bit server vm (build 24.79-b02, mixed mode)
ubuntu的apt-get安装方式和centos的yum安装方式很类似,这里就不再啰嗦。
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