CentOS7.0安装JDK1.8.0_31

1.检查一下系统中的jdk版本

$>java -version

java version "1.7.0_"
OpenJDK Runtime Environment (IcedTea6 1.11.1) (rhel-1.45.1.11.1.el6-x86_64)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)

2.检测JDK安装包

$>rpm -qa | grep java

avapackages-tools-3.4.1-6.el7_0.noarch
tzdata-java-2014i-1.el7.noarch
java-1.7.0-openjdk-headless-1.7.0.71-2.5.3.1.el7_0.x86_64
java-1.7.0-openjdk-1.7.0.71-2.5.3.1.el7_0.x86_64
python-javapackages-3.4.1-6.el7_0.noarch

3.卸载OpenJDK

$>rpm -e --nodeps tzdata-java-2014i-1.el7.noarch
$>rpm -e --nodeps java-1.7.0-openjdk-headless-1.7.0.71-2.5.3.1.el7_0.x86_64
$>rpm -e --nodeps java-1.7.0-openjdk-1.7.0.71-2.5.3.1.el7_0.x86_64

4.修改Jdk路径

$> vi    /etc/profile

在最后添加：

export JAVA_HOME=/root/tools/jdk1.8.0_65export JRE_HOME=${JAVA_HOME}/jreexport CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/libexport  PATH=${JAVA_HOME}/bin:$PATH

6.执行profile

$>source /etc/profile

解决权限不够

#chmod a+x filename

7.检查新安装的jdk

$>java -version