CentOS7 jdk安装

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上传jdk-8u231-linux-x64.tar.gz到/opt目录 cd /opt tar -xvf jdk-8u231-linux-x64.tar.gz -C /opt   cat >> /etc/profile <<"EOF" AVA_HOME=/opt/jdk1.8.0_231 CLASSPATH=.:$JAVA_HOME/lib.tools.jar PATH=$JAVA_HOME/bin:$PATH export JAVA_HOME CLASSPATH PATH EOF   在/etc/init.d/functionsPATH后面追加JDK路径，如： sed -i 's$PATH="/sbin:/usr/sbin:/bin:/usr/bin"$PATH="/sbin:/usr/sbin:/bin:/usr/bin:/opt/jdk1.8.0_231/bin"$g'   source /etc/profile java -version       --- 配置JCE加密算法强度不受限授权 cd ~/ mkdir tmp cd tmp wget -v --header "Cookie: oraclelicense=accept-securebackup-cookie" https://edelivery.oracle.com/otn-pub/java/jce/8/jce_policy-8.zip -O jce_policy-8.zip unzip jce_policy-8.zip cd UnlimitedJCEPolicyJDK8/ mkdir original mv /opt/jdk1.8.0_231/jre/lib/security/local_policy.jar original mv /opt/jdk1.8.0_231/jre/lib/security/US_export_policy.jar original cp local_policy.jar US_export_policy.jar /opt/jdk1.8.0_231/jre/lib/security/ ls -lrt /opt/jdk1.8.0_231/jre/lib/security/ 最终确认local_policy.jar、US_export_policy.jar替换成功   rm -rf ~/tmp     --- 在某些操作系统如CentOS 7，JDK第一次生成随机数会非常慢，参考: https://docs.oracle.com/cd/E13209_01/wlcp/wlss30/configwlss/jvmrand.html 我们需要将修改$JAVA_HOME/jre/lib/security/java.security文件   sed -i 's$securerandom.source=file:/dev/random$securerandom.source=file:/dev/urandom$g' $JAVA_HOME/jre/lib/security/java.security