JDK下載地址
OracleJDK:http://www.oracle.com/technetwork/java/javase/downloads/index.html
首先需要下載jdk：
用 wget 直接下載 Oracle 的 jdk - Eric的日誌 - 網易博客 http://blog.163.com/yg_qi/blog/static/96721735201411351937286/
wget和curl方式下載JDK_Linux教程_Linux公社-Linux系統門戶網站 http://www.linuxidc.com/Linux/2016-10/135925.htm
關於使用wget下載oracleJDK問題 - 堯十九 - 博客園 http://www.cnblogs.com/we4thy/p/6827871.html
由於oracle上的下載頁面有跳轉，直接用wget下載下來的只是html頁面。可以用下面的命令：
wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u74-b02/jdk-8u74-linux-x64.tar.gz"
OpenJDK :http://openjdk.java.net/
0.查看系統版本信息
1.Windows端下載完成後，通過文件夾共享到Linux上
2.Linux端使用相關命令下載
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方法一：手動解壓JDK的壓縮包，然後設置環境變量
1.在/usr/目錄下創建java目錄
[root@localhost ~]# mkdir/usr/java
[root@localhost ~]# cd /usr/java
2.下載jdk,然後解壓
阿里雲CentOS下安裝jdk - pkufork - 博客園 http://www.cnblogs.com/pkufork/p/java_sdk.html
[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
wget --no-check-certificate --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u152-b16/aa0333dd3019491ca4f6ddbe78cdb6d0/jdk-8u152-linux-x64.tar.gz
3.設置環境變量
[root@localhost java]# vi /etc/profile
在profile中添加如下內容:
#set java environment export JAVA_HOME=/usr/java/jdk1.8.0_60 export CLASSPATH=$JAVA_HOME/lib/ export PATH=$PATH:$JAVA_HOME/bin export PATH JAVA_HOME CLASSPATH
讓修改生效:
[root@localhost java]# source /etc/profile
4.驗證JDK有效性
[root@localhost java]# java -version java version "1.7.0_79" Java(TM) SE Runtime Environment (build 1.7.0_79-b15) Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)
方法二：用yum安裝JDK
1.查看yum庫中都有哪些jdk版本(暫時只發現了openjdk)
[root@localhost ~]# yum search java|grep jdk ldapjdk-javadoc.x86_64 : Javadoc for ldapjdk java-1.6.0-openjdk.x86_64 : OpenJDK Runtime Environment java-1.6.0-openjdk-demo.x86_64 : OpenJDK Demos java-1.6.0-openjdk-devel.x86_64 : OpenJDK Development Environment java-1.6.0-openjdk-javadoc.x86_64 : OpenJDK API Documentation java-1.6.0-openjdk-src.x86_64 : OpenJDK Source Bundle java-1.7.0-openjdk.x86_64 : OpenJDK Runtime Environment java-1.7.0-openjdk-demo.x86_64 : OpenJDK Demos java-1.7.0-openjdk-devel.x86_64 : OpenJDK Development Environment java-1.7.0-openjdk-javadoc.noarch : OpenJDK API Documentation java-1.7.0-openjdk-src.x86_64 : OpenJDK Source Bundle java-1.8.0-openjdk.x86_64 : OpenJDK Runtime Environment java-1.8.0-openjdk-demo.x86_64 : OpenJDK Demos java-1.8.0-openjdk-devel.x86_64 : OpenJDK Development Environment java-1.8.0-openjdk-headless.x86_64 : OpenJDK Runtime Environment java-1.8.0-openjdk-javadoc.noarch : OpenJDK API Documentation java-1.8.0-openjdk-src.x86_64 : OpenJDK Source Bundle ldapjdk.x86_64 : The Mozilla LDAP Java SDK
2.選擇版本,進行安裝
//選擇1.7版本進行安裝
[root@localhost ~]# yum install java-1.7.0-openjdk
//安裝完之後，默認的安裝目錄是在: /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.75.x86_64
3.設置環境變量
[root@localhost ~]# vi /etc/profile
在profile文件中添加如下內容
#set java environment
JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.75.x86_64
JRE_HOME=$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
讓修改生效
[root@localhost java]# source /etc/profile
4.驗證(同上一方法)
方法三：用rpm安裝JDK
1.下載rpm安裝文件
[root@localhost ~]$ curl -O http://download.oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-x64.rpm
2.使用rpm命令安裝
[root@localhost ~]# rpm -ivh jdk-7u79-linux-x64.rpm
3.設置環境變量
[root@localhost java]# vi /etc/profile
在打開的profile文件中添加如下內容
#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
讓修改生效
[root@localhost java]# source /etc/profile
4.驗證(同上一方法)
注:和yum安裝類似，不用設置環境變量就可以運行java命令。rpm安裝方式默認會把jdk安裝到/usr/java/jdk1.7.0_79，然後通過三層鏈接，鏈接到/usr/bin,具體鏈接如下：
[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安裝JDK
1.查看apt庫都有哪些jdk版本
root@linuxidc:~# 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.選擇版本進行安裝
root@linuxidc:~# apt-get install openjdk-7-jdk
3.設置環境變量
root@linuxidc:~# vi /etc/profile
在打開的profile文件中添加如下內容
#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
讓修改生效
root@linuxidc:~# source /etc/profile
4.驗證(同上一方法)