1. Check which jdk versions are in the yum library (only openjdk has been found for the time being)
[root@localhost ~]# yum search java|grep jdk
ldapjdk-javadoc.x86_64 : Javadoc for ldapjdk
java-1.6.0-openjdk.x86_64 : OpenJDK Runtime Environment
java-1.6.0-openjdk-demo.x86_64 : OpenJDK Demos
java-1.6.0-openjdk-devel.x86_64 : OpenJDK Development Environment
java-1.6.0-openjdk-javadoc.x86_64 : OpenJDK API Documentation
java-1.6.0-openjdk-src.x86_64 : OpenJDK Source Bundle
java-1.7.0-openjdk.x86_64 : OpenJDK Runtime Environment
java-1.7.0-openjdk-demo.x86_64 : OpenJDK Demos
java-1.7.0-openjdk-devel.x86_64 : OpenJDK Development Environment
java-1.7.0-openjdk-javadoc.noarch : OpenJDK API Documentation
java-1.7.0-openjdk-src.x86_64 : OpenJDK Source Bundle
java-1.8.0-openjdk.x86_64 : OpenJDK Runtime Environment
java-1.8.0-openjdk-demo.x86_64 : OpenJDK Demos
java-1.8.0-openjdk-devel.x86_64 : OpenJDK Development Environment
java-1.8.0-openjdk-headless.x86_64 : OpenJDK Runtime Environment
java-1.8.0-openjdk-javadoc.noarch : OpenJDK API Documentation
java-1.8.0-openjdk-src.x86_64 : OpenJDK Source Bundle
ldapjdk.x86_64 : The Mozilla LDAP Java SDK
2.选择版本,进行安装
//Select version 1.7 to install
[root@localhost ~]# yum install java-1.7.0-openjdk
//After installation, the default installation directory is: /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.75.x86_64
3. Set environment variables
[root@localhost ~]# vi /etc/profile
Add the following to the profile file
set java environment
JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.75.x86_64
JRE_HOME=JA VAHO ME/jreCL A SSPATH=.:JAVAHOME/jreCLASSPATH=.:JAVA_HOME/lib/dt.jar:JA VAHO ME/lib/tools.jar:JAVAHOME/lib/tools.jar:JRE_HOME/lib
PATH=PATH:PATH: JAVA_HOME/bin:$JRE_HOME/bin
export JAVA_HOME JRE_HOME CLASS_PATH PATH
makes the modification take effect
[root@localhost java]# source /etc/profile
4. Verify
[root@localhost java]# java -version
openjdk version “1.8.0_151”
OpenJDK Runtime Environment (build 1.8.0_151-b12)
OpenJDK 64-Bit Server VM (build 25.151-b12, mixed mode)
success!
5. If the problem occurs after installation:
It is found that /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.75.x86_64 only has jre files and no other files. When java_home is set, there will be problems.
Please install java-1.8.0-openjdk-devel.x86_64