linux 安装java jdk

1、检查一下系统中的jdk版本

[root@localhost software]# java -version 

显示：

openjdk version "1.8.0_102" OpenJDK Runtime Environment (build 1.8.0_102-b14) OpenJDK 64-Bit Server VM (build 25.102-b14, mixed mode) 

2、检测jdk安装包

[root@localhost software]# rpm -qa | grep java 

显示：

java-1.7.0-openjdk-1.7.0.111-2.6.7.8.el7.x86_64 python-javapackages-3.4.1-11.el7.noarch tzdata-java-2016g-2.el7.noarch javapackages-tools-3.4.1-11.el7.noarch java-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64 java-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64 java-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64 

3、卸载openjdk

[root@localhost software]# rpm -e --nodeps tzdata-java-2016g-2.el7.noarch [root@localhost software]# rpm -e --nodeps java-1.7.0-openjdk-1.7.0.111-2.6.7.8.el7.x86_64 [root@localhost software]# rpm -e --nodeps java-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64 [root@localhost software]# rpm -e --nodeps java-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64 [root@localhost software]# rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64 

或者使用

[root@localhost jvm]# yum remove *openjdk* 

之后再次输入rpm -qa | grep java 查看卸载情况：

[root@localhost software]# rpm -qa | grep java python-javapackages-3.4.1-11.el7.noarch javapackages-tools-3.4.1-11.el7.noarch 

4、安装新的jdk

[root@localhost software]# ll total 181192 -rw-r--r-- 1 root root 185540433 May 20  2017 jdk-8u131-linux-x64.tar.gz 

解压 jdk-8u131-linux-x64.tar.gz安装包

[root@localhost software]# mkdir -p /opt/soft [root@localhost software]# mv jdk-8u131-linux-x64.tar.gz  /opt/soft [root@localhost software]# tar -zxvf jdk-8u131-linux-x64.tar.gz  [root@localhost software]# ln -s jdk1.8.0_131 jdk 

5、设置环境变量

[root@localhost software]# vim /etc/profile 

在最前面添加：

export JAVA_HOME=/opt/soft/jdk export JRE_HOME=${JAVA_HOME}/jre   export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib   export  PATH=${JAVA_HOME}/bin:$PATH 

6、执行profile文件

[root@localhost software]# source /etc/profile 

7、检查新安装的jdk

[root@localhost software]# java -version 

显示：

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)