CentOS 6.8 安裝JDK1.7

檢查Linux系統是否已安裝jdk[root@linux1 ~]# rpm -qa | grep javatzdata-java-2016c-1.el6.noarchjava-1.6.0-openjdk-1.6.0.38-1.13.10.4.el6.x86_64java-1.7.0-openjdk-1.7.0.99-2.6.5.1.el6.x86_64卸載系統內建的java[root@linux3 ~]# rpm -qa | grep java | xargs rpm -e --nodeps查看卸載結果[root@linux3 ~]# java -versionbash: /usr/bin/java: No such file or directory卸載成功

Java各個曆史版本下載連結：http://download.oracle.com/otn/java/jdk/7u80-b15/jdk-7u80-linux-x64.tar.gz?AuthParam=1521384623_73e629f3cfd12c4b38b8a705405f5974

下載jdkwget 擷取地址，命令如下：

wget --no-check-certificate --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn/java/jdk/7u80-b15/jdk-7u80-linux-x64.tar.gz?AuthParam=1514647148_4deb02bdc334d35818d4a0ba91b4f311

http://www.Oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.htmljdk-7u79-linux-x64.rpmjdk-7u79-linux-x64.tar.gz

第一種方法：rpm包安裝rpm包匯入使用者root目錄下[root@linux2 ~]# lsanaconda-ks.cfg  id_dsa.pub  install.log  install.log.syslog jdk-7u79-linux-x64.rpm賦予許可權[root@linux2 ~]# chmod 755 jdk-7u79-linux-x64.rpm安裝[root@linux2 ~]# rpm -ivh jdk-7u79-linux-x64.rpmPreparing...                ########################################### [100%]1:jdk                    ########################################### [100%]Unpacking JAR files...rt.jar...jsse.jar...charsets.jar...tools.jar...localedata.jar...jfxrt.jar...安裝完成

第二種方法：二進位包安裝建立JAVA_HOME目錄[root@linux3 ~]# mkdir /usr/java將二進位包放在 /usr/java/ 下並解壓[root@linux3 ~]# mv jdk-7u79-linux-x64.tar.gz /usr/java[root@linux3 ~]# cd /usr/java[root@linux3 java]# tar xvf jdk-7u79-linux-x64.tar.gz查看結果[root@linux3 java]# lsjdk1.7.0_79  jdk-7u79-linux-x64.tar.gz為了節省空間的，可以將二進位包刪去[root@linux3 java]# rm -rf jdk-7u79-linux-x64.tar.gz

配置全域java環境變數[root@linux3 java]# vi /etc/profile最後面添加export JAVA_HOME=/usr/java/jdk1.7.0_79export JRE_HOME=$JAVA_HOME/jreexport PATH=$PATH:$JAVA_HOME/binexport CLASSPATH=./:$JAVA_HOME/lib:$JAVA_HOME/jre/lib儲存退出使profile配置生效[root@linux3 java]# source /etc/profile

配置使用者java環境變數[root@linux3 java]# vi ~/.bashrcexport JAVA_HOME=/usr/java/jdk1.7.0_79export JRE_HOME=$JAVA_HOME/jreexport PATH=$PATH:$JAVA_HOME/binexport CLASSPATH=./:$JAVA_HOME/lib:$JAVA_HOME/jre/lib使bashrc配置生效[root@linux3 java]# source ~/.bashrc

檢查一下環境變數[root@linux3 java]# echo $JAVA_HOME/usr/java/jdk1.7.0_79[root@linux3 java]# echo $CLASSPATH./:/usr/java/jdk1.7.0_79/lib:/usr/java/jdk1.7.0_79/jre/lib[root@linux3 java]# echo $PATH/usr/local/cmake-2.8.10.2/bin:/usr/local/mysql/bin:/usr/local/mysql/lib:/usr/local/cmake-2.8.10.2/bin:/usr/local/mysql/bin:/usr/local/mysql/lib:/usr/lib64/qt-3.3/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin:/usr/java/jdk1.7.0_79/bin:/usr/java/jdk1.7.0_79/bin安裝完成最後檢測一下已經安裝的jdk[root@linux3 java]# java -versionjava version "1.7.0_79"Java(TM) SE Runtime Environment (build 1.7.0_79-b15)Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)或者輸入 javac