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Centos以RPM方式安装java

检验系统原版本:

[root@localhost /]# java -version
openjdk version "1.8.0_161"
OpenJDK Runtime Environment (build 1.8.0_161-b14)
OpenJDK 64-Bit Server VM (build 25.161-b14, mixed mode)

进一步查看JDK信息:

[root@localhost /]# rpm -qa | grep java
python-javapackages-3.4.1-11.el7.noarch
java-1.8.0-openjdk-headless-1.8.0.161-2.b14.el7.x86_64
tzdata-java-2018c-1.el7.noarch
java-1.7.0-openjdk-1.7.0.171-2.6.13.2.el7.x86_64
java-1.8.0-openjdk-1.8.0.161-2.b14.el7.x86_64
javapackages-tools-3.4.1-11.el7.noarch
java-1.7.0-openjdk-headless-1.7.0.171-2.6.13.2.el7.x86_64

卸载OpenJDK,执行以下操作:

[root@localhost /]# rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.161-2.b14.el7.x86_64
[root@localhost /]# rpm -e --nodeps java-1.8.0-openjdk-1.8.0.161-2.b14.el7.x86_64
[root@localhost /]# rpm -e --nodeps java-1.7.0-openjdk-1.7.0.171-2.6.13.2.el7.x86_64
[root@localhost /]# rpm -e --nodeps java-1.7.0-openjdk-headless-1.7.0.171-2.6.13.2.el7.x86_64

安装JDK
上传新的jdk-8u191-linux-x64.rpm软件到/usr/local/src/执行以下操作:

[root@localhost src]# rpm -ivh jdk-8u191-linux-x64.rpm 
警告:jdk-8u191-linux-x64.rpm: 头V3 RSA/SHA256 Signature, 密钥 ID ec551f03: NOKEY
准备中...                          ################################# [100%]
正在升级/安装...
   1:jdk1.8-2000:1.8.0_191-fcs        ################################# [100%]
Unpacking JAR files...
	tools.jar...
	plugin.jar...
	javaws.jar...
	deploy.jar...
	rt.jar...
	jsse.jar...
	charsets.jar...
	localedata.jar...
[root@localhost src]# java -version
java version "1.8.0_191"
Java(TM) SE Runtime Environment (build 1.8.0_191-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.191-b12, mixed mode)

JDK默认安装在/usr/java中
验证安装
执行以下操作,查看信息是否正常:

[root@localhost src]# java -version
java version "1.8.0_191"
Java(TM) SE Runtime Environment (build 1.8.0_191-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.191-b12, mixed mode)

配置环境变量
我的机器安装完jdk-8u191-linux-x64.rpm后不用配置环境变量也可以正常执行javac、java –version操作,因此我没有进行JDK环境变量的配置。但是为了以后的不适之需,这里还是记录一下怎么进行配置,操作如下:
修改系统环境变量文件

[root@localhost src]# vi /etc/profile

向文件里面追加以下内容:

JAVA_HOME=/usr/java/jdk1.8.0_191-amd64
JRE_HOME=/usr/java/jdk1.8.0_191-amd64/jre
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
export JAVA_HOME JRE_HOME PATH CLASSPATH

使修改生效

[root@localhost /]# source /etc/profile
[root@localhost /]# echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin:/usr/java/jdk1.8.0_191-amd64/bin:/usr/java/jdk1.8.0_191-amd64/jre/bin:/usr/java/jdk1.8.0_191-amd64/bin:/usr/java/jdk1.8.0_191-amd64/jre/bin

转载请标明来源:ibear » Centos以RPM方式安装java

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