centos jdk 1.7升级到1.8后显示还是1.7

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系统原来安装的是jdk 1.7,现在要升级到1.8,查看了一下,原来是通过解压的方式安装的,
现在重新按这种方式安装1.8

1 下载jdk1.8
http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
找到下载链接
然后在linux中:

  1. wget http://111.1.50.111/files/323000000641B15B/download.oracle.com/otn-pub/java/jdk/8u151-b12/e758a0de34e24606bca991d704f6dcbf/jdk-8u151-linux-x64.tar.gz
  2. --2017-11-04 16:58:18-- http://111.1.50.111/files/323000000641B15B/download.oracle.com/otn-pub/java/jdk/8u151-b12/e758a0de34e24606bca991d704f6dcbf/jdk-8u151-linux-x64.tar.gz
  3. Connecting to 111.1.50.111:80... connected.
  4. HTTP request sent,awaiting response... 200 OK
  5. Length: 189736377 (181M) [application/octet-stream]
  6. Saving to: jdk-8u151-linux-x64.tar.gz
  7.  
  8. 100%[=======================================================================================================>] 189,736,377 13.6MB/s in 15s
  9.  
  10. 2017-11-04 16:58:32 (12.5 MB/s) - jdk-8u151-linux-x64.tar.gz saved [189736377/189736377]
  11. [root@izwz95v28cpic4beuk0rk0z java]# ls
  12. jdk1.7.0_79 jdk-7u79-linux-x64.tar.gz jdk-8u151-linux-x64.tar.gz

下载成功.

  1. tar -xzvf jdk-8u151-linux-x64.tar.gz
  2. [root@izwz95v28cpic4beuk0rk0z java]# ls
  3. jdk1.7.0_79 jdk1.8.0_151 jdk-7u79-linux-x64.tar.gz jdk-8u151-linux-x64.tar.gz
  4. [root@izwz95v28cpic4beuk0rk0z jdk1.8.0_151]# pwd
  5. /usr/java/jdk1.8.0_151
  6. vim /etc/profile
  7.  
  8. # java env
  9. # java env
  10. JAVA_HOME=/usr/java/jdk1.8.0_151
  11. PATH=$PATH:${JAVA_HOME}/bin
  12. CLASSPATH=.:${JAVA_HOME}/jre/lib/rt.jar:${JAVA_HOME}/lib/dt.jar:${JAVA_HOME}/lib/tools.jar
  13. export PATH JAVA_HOME CLASSPATH
  14. root@izwz95v28cpic4beuk0rk0z jdk1.8.0_151]# java -version
  15. java version "1.7.0_79"

查看Jdk版本还是1.7,最后发现PATH应该这样写:

  1. PATH=${JAVA_HOME}/bin:$PATH
  2.  
  3. 要把$JAVA_HOME/bin放在前面,不然使用java命令时,系统会找到以前 java

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