centos下安裝jdk

centos下安裝jdk

檢查yum庫中有哪些jdk版本

yum search java|grep jdk 

顯示如下：

java-1.6.0-openjdk-debuginfo.x86_64 : Debug information for package
                                    : java-1.6.0-openjdk
java-1.7.0-openjdk-debuginfo.x86_64 : Debug information for package
                                    : java-1.7.0-openjdk
java-1.7.0-openjdk-debuginfo.i686 : Debug information for package
                                  : java-1.7.0-openjdk
java-1.8.0-openjdk-debuginfo.x86_64 : Debug information for package
                                    : java-1.8.0-openjdk
ldapjdk-javadoc.noarch : 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-accessibility.x86_64 : OpenJDK accessibility connector
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-headless.x86_64 : The OpenJDK runtime environment without
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.i686 : OpenJDK Runtime Environment
java-1.8.0-openjdk.x86_64 : OpenJDK Runtime Environment
java-1.8.0-openjdk-accessibility.x86_64 : OpenJDK accessibility connector
java-1.8.0-openjdk-accessibility-debug.x86_64 : OpenJDK accessibility connector
java-1.8.0-openjdk-debug.i686 : OpenJDK Runtime Environment with full debug on
java-1.8.0-openjdk-debug.x86_64 : OpenJDK Runtime Environment with full debug on
java-1.8.0-openjdk-demo.x86_64 : OpenJDK Demos
java-1.8.0-openjdk-demo-debug.x86_64 : OpenJDK Demos with full debug on
java-1.8.0-openjdk-devel.i686 : OpenJDK Development Environment
java-1.8.0-openjdk-devel.x86_64 : OpenJDK Development Environment
java-1.8.0-openjdk-devel-debug.i686 : OpenJDK Development Environment with full
java-1.8.0-openjdk-devel-debug.x86_64 : OpenJDK Development Environment with
java-1.8.0-openjdk-headless.i686 : OpenJDK Runtime Environment
java-1.8.0-openjdk-headless.x86_64 : OpenJDK Runtime Environment
java-1.8.0-openjdk-headless-debug.i686 : OpenJDK Runtime Environment with full
java-1.8.0-openjdk-headless-debug.x86_64 : OpenJDK Runtime Environment with full
java-1.8.0-openjdk-javadoc.noarch : OpenJDK API Documentation
java-1.8.0-openjdk-javadoc-debug.noarch : OpenJDK API Documentation for packages
java-1.8.0-openjdk-javadoc-zip.noarch : OpenJDK API Documentation compressed in
java-1.8.0-openjdk-javadoc-zip-debug.noarch : OpenJDK API Documentation
java-1.8.0-openjdk-src.x86_64 : OpenJDK Source Bundle
java-1.8.0-openjdk-src-debug.x86_64 : OpenJDK Source Bundle for packages with
ldapjdk.noarch : The Mozilla LDAP Java SDK

選擇版本進行安裝

注意不要選擇最新的版本

 yum install java-1.7.0-openjdk 

設置環境變量

vi /etc/profile 

直接複製粘貼下面的配置：

#set java environment 
JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.75.x86_64 
JRE_HOME=$JAVA_HOME/jre 
CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib 
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin 
export JAVA_HOME JRE_HOME CLASS_PATH PATH 

讓修改生效

source /etc/profile 

檢查安裝是否成功

java -version