Linux 安装 JDK 8

1. step1: 下载最新的 Java Archive 

# 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/10.0.2+13/19aef61b38124481863b1413dce1855f/jdk-10.0.2_linux-x64_bin.tar.gz"

# 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/8u181-b13/96a7b8442fe848ef90c96a2fad6ed6d1/jdk-8u181-linux-x64.tar.gz"

# wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie"    "https://download.java.net/openjdk/jdk7u75/ri/openjdk-7u75-b13-linux-x64-18_dec_2014.tar.gz"

# tar xzf jdk-10.0.2_linux-x64_bin.tar.gz  -C /opt/

2. step2: 安装 Java 8 with Alternatives

# cd /opt/jdk1.8.0_171/
# alternatives --install /usr/bin/java java /opt/jdk1.8.0_171/bin/java 2
# alternatives --config java

There are 3 programs which provide 'java'.

Selection    Command
-----------------------------------------------
*  1           /opt/jdk1.7.0_71/bin/java
+ 2           /opt/jdk1.8.0_45/bin/java
   3           /opt/jdk1.8.0_144/bin/java
   4           /opt/jdk1.8.0_171/bin/java

Enter to keep the current selection[+], or type selection number: 4

# alternatives --install /usr/bin/jar jar /opt/jdk1.8.0_171/bin/jar 2
# alternatives --install /usr/bin/javac javac /opt/jdk1.8.0_171/bin/javac 2
# alternatives --set jar /opt/jdk1.8.0_171/bin/jar
# alternatives --set javac /opt/jdk1.8.0_171/bin/javac

3. step3: 检查刚刚安装的Java版本

# java -version

java version "1.8.0_171"
Java(TM) SE Runtime Environment (build 1.8.0_171-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.171-b11, mixed mode)

4. step4: 配置Java环境变量

# export JAVA_HOME=/opt/jdk1.8.0_171
# export JRE_HOME=/opt/jdk1.8.0_171/jre
# export PATH=$PATH:/opt/jdk1.8.0_171/bin:/opt/jdk1.8.0_171/jre/bin