Changing the Java environment under CENTOS7

1. Upload the downloaded Java package, such as http://download.oracle.com/otn-pub/java/jdk/8u77-b03/jre-8u77-linux-x64.rpm, the directory can be defined by itself, such as/root/ elasticsearch/

2. Run the Install command:

Yum install/root/elasticsearch/jre-8u77-linux-x64.rpm

If the prompt is not successfully installed, ls–al/root/elasticsearch/jre-8u77-linux-x64.rpm see if the current file has execute permissions and if not, run

chmod +x/root/elasticsearch/jre-8u77-linux-x64.rpm, adding Execute permissions

After the installation is complete, if you are unsure whether the installation was successful, you can perform the following view commands:

Find/–maxdepth–8–name jre1.8*

Typically installed by default under/usr/java/

3. Modify the Java link

(Method 1, directly modify the symbolic link)

First look at the current Java version of Java–version, such as 1.7.0_91

Start to modify the link: Execute in turn;

Alternatives--install/usr/bin/java Java/usr/java/jre1.8.0_77/bin/java 300

Alternatives--config Java

View the Java version at this time:

Java–version, became 1.8.0_77.

(Method 2, modify the Java Path environment variable)

After installation, confirm the current installation path (not clear, according to the version you installed check execution:find/–maxdepth–8–name jre1.8*)

Add the current path to the $path variable, as the path I installed is/usr/java/jre1.8.0_77/bin

Edit the/etc/profile file using VI, vi/etc/profile/

Add at end of line:

Path=/usr/java/jre1.8.0_77/bin: $PATH;

To see if a variable has been added:

Echo $PATH

Verifying the Java version:

Java-version

Reference:

Http://www.cnblogs.com/kreo/p/4308651.html

Changing the Java environment under CENTOS7