卸載已安裝的open jdk[1][2]
- 查看系統(tǒng)已安裝的jdk：
rpm -qa|grep jdk
copy-jdk-configs-1.2-1.el7.noarch
java-1.8.0-openjdk-headless-1.8.0.131-3.b12.el7_3.x86_64
java-1.8.0-openjdk-1.8.0.131-3.b12.el7_3.x86_64
- 查詢java相關(guān)的信息：
rpm -qa|grep java
javapackages-tools-3.4.1-11.el7.noarch
python-javapackages-3.4.1-11.el7.noarch
java-1.8.0-openjdk-headless-1.8.0.131-3.b12.el7_3.x86_64
java-1.8.0-openjdk-1.8.0.131-3.b12.el7_3.x86_64
tzdata-java-2017b-1.el7.noarch
javamail-1.4.6-8.el7.noarch
- 卸載：
rpm -e --nodeps copy-jdk-configs-1.2-1.el7.noarch
rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.131-3.b12.el7_3.x86_64
rpm -e --nodeps java-1.8.0-openjdk-1.8.0.131-3.b12.el7_3.x86_64
如果卸載對(duì)應(yīng)后繼續(xù)運(yùn)行卸載該命令，會(huì)出現(xiàn)以下提示：
error: package java-1.8.0-openjdk-1.8.0.131-3.b12.el7_3.x86_64 is not installed
安裝JDK[1]
- 在JDK下載頁面找到對(duì)應(yīng)的包，然后進(jìn)行下載:
centos:
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/8u144-b01/090f390dda5b47b9b721c7dfaa008135/jdk-8u144-linux-x64.rpm"
ubuntu:
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/8u144-b01/090f390dda5b47b9b721c7dfaa008135/jdk-8u144-linux-x64.tar.gz?AuthParam=1504071462_ada46b0cca620eea37f1524f3d72847f"
- 安裝:
centos:rpm -ivh jdk-8u144-linux-x64.rpm
ubuntu:tar zxf jdk-8u144-linux-x64.tar.gz - 校驗(yàn):
java -version
java version "1.8.0_131"
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)
- 設(shè)置JAVA_HOME
-
vim ~/.bashrc颁督，打開該文件 - 然后在vim模式下輸入a
- 定位到文件最后位置璧诵，粘貼以下內(nèi)容
-
export JAVA_HOME=/usr/java/jdk1.8.0_131
export PATH=$PATH:$JAVA_HOME
- 按下
esc鍵 - 輸入冒號(hào)
:，然后輸入wq保存修改并且推出即可
或者：
echo 'export JAVA_HOME="/opt/jdk1.8.0_144"
export PATH="$JAVA_HOME/bin:$JAVA_HOME/jre:$PATH"' >> ~/.bashrc
