CentOS7卸載自帶的openJDK，並安裝oracle-jdk1.8 發佈於 2 天前 – 106 次檢閱
- 2020 年 4 月 9 日
- 筆記
1.刪除舊版(自帶jdk)：
rpm -qa|grep jdk rpm -e java-xxx –nodeps
2.安裝jdk：
rpm -ivh jdk-8u112-linux-x64.rpm
3.確保使用的java版本是上面安裝的版本。
java -version
有時候可能運到安裝JDK後，系統還是使用自帶的open jdk。
在這種情況一般需要把/usr/bin/下java相關的軟鏈接重新建立。例子：
rm /usr/bin/java ln -s /usr/java/default/bin/java /usr/bin/java rm /usr/bin/javac ln -s /usr/java/default/bin/javac /usr/bin/javac rm /usr/bin/javadoc ln -s /usr/java/default/bin/javadoc /usr/bin/javadoc rm /usr/bin/javafxpackager ln -s /usr/java/default/bin/javafxpackager /usr/bin/javafxpackager rm /usr/bin/javah ln -s /usr/java/default/bin/javah /usr/bin/javah rm /usr/bin/javap ln -s /usr/java/default/bin/javap /usr/bin/javap rm /usr/bin/javapackager ln -s /usr/java/default/bin/javapackager /usr/bin/javapackager rm /usr/bin/java-rmi.cgi ln -s /usr/java/default/bin/java-rmi.cgi /usr/bin/java-rmi.cgi rm /usr/bin/javaws ln -s /usr/java/default/bin/javaws /usr/bin/javaws
下面提供一個一鍵腳本吧，代碼如下：
#!/bin/bash declare INSTALLVERSION declare INSTALLFILE isNeedInstall() { local versioninfo=`java -version 2>&1` if [ $? -eq 0 ] then local version=`java -version 2>&1 | awk '{if(NR==1){gsub(/"/,""); print $3}}'` if [[ $versioninfo == "openjdk"* || $versioninfo == *"IBM"* ]] then echo "install openjdk or ibm jdk" return 1 elif [[ "${INSTALLVERSION}" == "${version}" ]] then echo "The oracle jdk(${INSTALLVERSION}) has installed." return 0 else echo "This machine installed oracle jdk, but the version is wrong." return 1 fi else echo "This machine doesn't install oracle jdk." return 1 fi } find_installfile() { local filename=`ls |grep ^jdk.*.rpm` if [[ -f ${filename} ]] then INSTALLFILE=${filename} return 0 else echo "can't find jdk install file." exit 1 fi } create_javalink() { local java_home=$1 local links=(java javac javadoc javafxpackager javah javap javapackager java-rmi.cgi javaws) for linkname in ${links[@]} do if [[ -f "/usr/bin/${linkname}" ]] then rm -f /usr/bin/${linkname} fi ln -s ${java_home}/bin/java /usr/bin/${linkname} done } install() { if [ ! -f ${INSTALLFILE} ] then echo "the file ${INSTALLFILE} doesn't exits. " return 1 else rpm -ivh ${INSTALLFILE} if [[ ! $? -eq 0 ]] then echo "install ${INSTALLFILE} error." return 1 else local version=`java -version 2>&1 | awk '{if(NR==1){gsub(/"/,""); print $3}}'` if [[ ! "${version}" == "${INSTALLVERSION}" ]] then echo "create sybomic link." if [ -d "/usr/java" ] then local java_home=`ls /usr/java | grep ${INSTALLVERSION}` if [[ "$java_home" == "" ]] then echo "can't find the java install directory." return 1 else create_javalink "/usr/java/${java_home}" version=`java -version 2>&1 | awk '{if(NR==1){gsub(/"/,""); print $3}}'` if [[ "${version}" == "${INSTALLVERSION}" ]] then echo "install jdk successfully." return 0 else echo "unkown error. please check in manul." return 1 fi fi else echo "/usr/java doesn't exist." return 1 fi else echo "install jdk successfully." return 0 fi fi fi } if [ $# -eq 1 ] then INSTALLVERSION=$1 find_installfile isNeedInstall if [ $? -eq 1 ] then install if [ $? -eq 0 ] then exit 0 else exit 1 fi else exit 0 fi else echo "params error.Usage: sh jdk_instanller.sh 1.8.0_181" exit 1 fi
運行腳本時，需要添加參數，參數名為你安裝java版本號，如:
bash jdk_instanller.sh 1.8.0_181
1.8.0_181 就是你的jdk版本號
