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[linux]CentOS下安装JDK的三种方法 [复制链接]

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gege0523
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只看楼主 倒序阅读 0 发表于: 2016-09-13
由于各Linux开发厂商的不同,因此不同开发厂商的Linux版本操作细节也不一样,今天就来说一下CentOS下JDK的安装：
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
  1. [root@localhost   ~]# mkdir/usr/java
  2. [root@localhost   ~]# cd /usr/java
2.下载jdk,然后解压
  1. [root@localhost   java]# curl -O http://download.oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-x64.tar.gz
  2. [root@localhost   java]# tar -zxvf jdk-7u79-linux-x64.tar.gz
3.设置环境变量
  1. [root@localhost   java]# vi /etc/profile
在profile中添加如下内容：
  1. #set java environment
  2. JAVA_HOME=/usr/java/jdk1.7.0_79
  3. JRE_HOME=/usr/java/jdk1.7.0_79/jre
  4. CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
  5. PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
  6. export JAVA_HOME JRE_HOME CLASS_PATH PATH
让修改生效：
  1. [root@localhost   java]# source /etc/profile
4.验证JDK有效性
  1. [root@localhost   java]# java -version
  2. java version "1.7.0_79"
  3. Java(TM) SE Runtime Environment (build 1.7.0_79-b15)
  4. Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)
方法二：用yum安装JDK
1.查看yum库中都有哪些jdk版本(暂时只发现了openjdk)
  1. [root@localhost   ~]# yum search java|grep jdk
  2. ldapjdk-javadoc.x86_64 : Javadoc for ldapjdk
  3. java-1.6.0-openjdk.x86_64 : OpenJDK Runtime Environment
  4. java-1.6.0-openjdk-demo.x86_64 : OpenJDK Demos
  5. java-1.6.0-openjdk-devel.x86_64 : OpenJDK Development Environment
  6. java-1.6.0-openjdk-javadoc.x86_64 : OpenJDK API Documentation
  7. java-1.6.0-openjdk-src.x86_64 : OpenJDK Source Bundle
  8. java-1.7.0-openjdk.x86_64 : OpenJDK Runtime Environment
  9. java-1.7.0-openjdk-demo.x86_64 : OpenJDK Demos
  10. java-1.7.0-openjdk-devel.x86_64 : OpenJDK Development Environment
  11. java-1.7.0-openjdk-javadoc.noarch : OpenJDK API Documentation
  12. java-1.7.0-openjdk-src.x86_64 : OpenJDK Source Bundle
  13. java-1.8.0-openjdk.x86_64 : OpenJDK Runtime Environment
  14. java-1.8.0-openjdk-demo.x86_64 : OpenJDK Demos
  15. java-1.8.0-openjdk-devel.x86_64 : OpenJDK Development Environment
  16. java-1.8.0-openjdk-headless.x86_64 : OpenJDK Runtime Environment
  17. java-1.8.0-openjdk-javadoc.noarch : OpenJDK API Documentation
  18. java-1.8.0-openjdk-src.x86_64 : OpenJDK Source Bundle
  19. ldapjdk.x86_64 : The Mozilla LDAP Java SDK
2.选择版本，进行安装
  1. //选择1.7版本进行安装
  2. [root@localhost   ~]# yum install java-1.7.0-openjdk
  3. //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
  1. [root@localhost   ~]# vi /etc/profile
在profile文件中添加如下内容
  1. #set java environment
  2. JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.75.x86_64
  3. JRE_HOME=$JAVA_HOME/jre
  4. CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
  5. PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
  6. export JAVA_HOME JRE_HOME CLASS_PATH PATH
让修改生效
  1. [root@localhost   java]# source /etc/profile
4.验证(同上一方法)
方法三：用rpm安装JDK
1.下载rpm安装文件
  1. [root@localhost   ~]$ 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
  1. [root@localhost   ~]# rpm -ivh jdk-7u79-linux-x64.rpm
3.设置环境变量
  1. [root@localhost   java]# vi /etc/profile
在打开的profile文件中添加如下内容：
  1. #set java environment
  2. JAVA_HOME=/usr/java/jdk1.7.0_79
  3. JRE_HOME=/usr/java/jdk1.7.0_79/jre
  4. CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
  5. PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
  6. export JAVA_HOME JRE_HOME CLASS_PATH PATH
让修改生效
  1. [root@localhost   java]# source /etc/profile
4.验证(同上一方法)
注: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：
  1. [root@localhost   ~]# cd /bin
  2. [root@localhost   bin]# ll|grep java
  3. lrwxrwxrwx. 1 root root 25 Mar 28 11:24 jar ->/usr/java/default/bin/jar
  4. lrwxrwxrwx. 1 root root 26 Mar 28 11:24 java -> /usr/java/default/bin/java
  5. lrwxrwxrwx. 1 root root 27 Mar 28 11:24 javac ->/usr/java/default/bin/javac
  6. lrwxrwxrwx. 1 root root 29 Mar 28 11:24 javadoc ->/usr/java/default/bin/javadoc
  7. lrwxrwxrwx. 1 root root 28 Mar 28 11:24 javaws ->/usr/java/default/bin/javaws
  8. lrwxrwxrwx. 1 root root 30 Mar 28 11:24 jcontrol ->/usr/java/default/bin/jcontrol
  9. [root@localhost   bin]# cd /usr/java/
  10. [root@localhost   java]# ll
  11. total 4
  12. lrwxrwxrwx. 1 root root 16 Mar 28 11:24 default-> /usr/java/latest
  13. drwxr-xr-x. 8 root root 4096 Mar 28 11:24 jdk1.7.0_79
  14. 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
  1. root@Itble:~# apt-cache search java|grep jdk
  2. default-jdk - Standard Java or Java compatible Development Kit
  3. default-jdk-doc - Standard Java or Java compatible Development Kit (documentation)
  4. gcj-4.6-jdk - gcj and classpath development tools for Java(TM)
  5. gcj-jdk - gcj and classpath development tools for Java(TM)
  6. openjdk-6-dbg - Java runtime based on OpenJDK (debugging symbols)
  7. openjdk-6-demo - Java runtime based on OpenJDK (demos and examples)
  8. openjdk-6-doc - OpenJDK Development Kit (JDK) documentation
  9. openjdk-6-jdk - OpenJDK Development Kit (JDK)
  10. openjdk-6-jre-lib - OpenJDK Java runtime (architecture independent libraries)
  11. openjdk-6-source - OpenJDK Development Kit (JDK) source files
  12. openjdk-7-dbg - Java runtime based on OpenJDK (debugging symbols)
  13. openjdk-7-demo - Java runtime based on OpenJDK (demos and examples)
  14. openjdk-7-doc - OpenJDK Development Kit (JDK) documentation
  15. openjdk-7-jdk - OpenJDK Development Kit (JDK)
  16. openjdk-7-source - OpenJDK Development Kit (JDK) source files
  17. uwsgi-plugin-jvm-openjdk-6 - Java plugin for uWSGI (OpenJDK 6)
  18. uwsgi-plugin-jwsgi-openjdk-6 - JWSGI plugin for uWSGI (OpenJDK 6)
  19. openjdk-6-jre - OpenJDK Java runtime, using Hotspot JIT
  20. openjdk-6-jre-headless - OpenJDK Java runtime, using Hotspot JIT (headless)
  21. openjdk-7-jre - OpenJDK Java runtime, using Hotspot JIT
  22. openjdk-7-jre-headless - OpenJDK Java runtime, using Hotspot JIT (headless)
  23. openjdk-7-jre-lib - OpenJDK Java runtime (architecture independent libraries)
2.选择版本进行安装
  1. root@Itble:~# apt-get install openjdk-7-jdk
3.设置环境变量
  1. root@Itble:~# vi /etc/profile
在打开的profile文件中添加如下内容
  1. #set java environment
  2. JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-amd64
  3. JRE_HOME=$JAVA_HOME/jre
  4. CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
  5. PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
  6. export JAVA_HOME JRE_HOME CLASS_PATH PATH
让修改生效
  1. root@Itble:~# source /etc/profile
4.验证(同上一方法)
本帖提到的人: @localhost
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