(java7.0安装教程)(java7安装教程)

1.首先卸载原装openjdk，然后再安装oracle jdk

[root@server soft]# rpm -qa |grep jdk

java-1.8.0-openjdk-1.8.0.242.b08-1.el7.x86_64

java-1.8.0-openjdk-headless-1.8.0.242.b08-1.el7.x86_64

2.卸载系统自带openjdk(也可不卸载)

[root@server soft]# rpm -e java-1.7.0-openjdk-headless-1.7.0.51-2.4.5.5.el7.x86_64 --nodeps

[root@server soft]#jrpm -e java-1.7.0-openjdk-1.7.0.51-2.4.5.5.el7.x86_64 --nodeps

[root@server soft]# rpm -e java-1.8.0-openjdk-headless-1.8.0.161-2.b14.el7.x86_64 --nodeps

[root@server soft]# rpm -e java-1.8.0-openjdk-1.8.0.161-2.b14.el7.x86_64 --nodeps

3.检查jdk版本

[root@server soft]# java --version

bash: java: 未找到命令...

[root@server soft]#

4.解压jdk1.7.0_80

[root@server soft]# cd /soft && tar zxvf jdk-7u80-linux-x64.tar.gz -C /usr/local

5.设置环境变量vim /etc/profile

#Set For Java Environment

export JAVA_HOME=/usr/local/jdk1.7.0_80

export JRE_HOME=${JAVA_HOME}/jre

export PATH=${JAVA_HOME}/bin:${PATH}

export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib

或者

#Set For Java Enviroment

export JAVA_HOME=/usr/local/jdk1.7.0_80

export JRE_HOME=${JAVA_HOME}/jre

export PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/jre

export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib

export JAVA_HOME JRE_HOME PATH CLASSPATH

6.使环境变量生效,再次检查版本,查看path环境变量

[root@server soft]# source /etc/profile && java -version

java version "1.7.0_80"

Java(TM) SE Runtime Environment (build 1.7.0_80-b15)

Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode)

[root@server soft]#

7.查看环境变量

[root@server ~]# echo $PATH

/usr/local/jdk1.7.0_80/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/mysql/bin:/root/bin

[root@server ~]#