前期準備，java執行環境

• 準備8u144版本jdk：jdk-8u144-linux-x64.rpm

多次從官網下載該rpm包失敗，因此需要自己下載好該安裝包

#!/bin/bash

################ 準備java環境 ######################
DOWNLOAD_PATH=""
JDK_PATH="jdk1.8.0_144" # "jre1.8.0_161/"
JAVA_JDK="jdk-8u144-linux-x64.rpm" # "jre-8u161-linux-x64.rpm"
ETC_PROFILE="/etc/profile"
 


if [ ! -f ${DOWNLOAD_PATH}${JAVA_JDK} ];then
    echo "downloadding ${JAVA_JDK}";
    # wget -O ${JAVA_JDK} http://javadl.oracle.com/webapps/download/AutoDL?BundleId=230531_2f38c3b165be4555a1fa6e98c45e0808 # 下載java原始碼包
fi

chmod -x ${DOWNLOAD_PATH}${JAVA_JDK}
rpm -ivh ${DOWNLOAD_PATH}${JAVA_JDK}

sed -i "/^JAVA_HOME=/d"
 
 ${ETC_PROFILE};
sed -i "/^JAVA_BIN=/d" ${ETC_PROFILE};
sed -i "/^PATH=\$PATH:\$JAVA_HOME\/bin/d" ${ETC_PROFILE};
sed -i "/^CLASSPATH=.:/d" ${ETC_PROFILE};
sed -i "/^export JAVA_HOME/d" ${ETC_PROFILE};

echo -e "\n" >> ${ETC_PROFILE};
echo -e "JAVA_HOME=/usr/java/${JDK_PATH}" >> ${ETC_PROFILE};
echo
 
 -e "JAVA_BIN=/usr/java/${JDK_PATH}" >> ${ETC_PROFILE};
echo -e "PATH=\$PATH:\$JAVA_HOME/bin" >> ${ETC_PROFILE};
echo -e "CLASSPATH=.:\$JAVA_HOME/lib/dt.jar:\$JAVA_HOME/lib/tools.jar" >> ${ETC_PROFILE};
echo -e "export JAVA_HOME JAVA_BIN PATH CLASSPATH\n" >> ${ETC_PROFILE};

if [ $? -ne 0 ] ;then
    exit 1;
fi;
source /etc/profile
echo "java version is:";
java -version

############### java環境搭建完成 ###################