[ CentOS ] jdk 설치

[ JDK 1.8 설치 ]

https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html 

위 URL에 접속하여 자신의 개발환경에 맞는 링크를 선택하여 마우스 우클릭 링크복사를 하자 

1) wget 설치

wget --no-check-certificate --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/8u181-b13/96a7b8442fe848ef90c96a2fad6ed6d1/jdk-8u181-linux-x64.tar.gz

wget --no-check-certificate --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie" [복사 URL]  입력 

다운로드 안될 시 직접 다운로드 받아 ftp로 업로드.

2) 압축 해제 

#tar -xvf jdk-8u181-linux-x64.tar.gz

3) jdk 파일 이동 

#mv jdk1.8.0_181 /usr/local/

4) 심볼릭링크 생성 
- jdk 버젼 변경시 환경변수 설정 변경없이 단순히 링크만 변경해주면 되기 때문에 심볼릭 링크를 설정

#cd /usr/local
#ln -s jdk1.8.0_181 java 

[ 환경변수 설정 ]

리눅스에서 기본적으로 설정된 java 명령어 인식을 피하기 위해 /usr/bin/java 디렉토리명 변경 

1) 디렉토리명 변경

#mv /usr/bin/java /usr/bin/java-old

2) /etc/profile 수정

#vi /etc/profile

--제일 하단에 다음과 같이 추가 
......
......
#java    
export JAVA_HOME=/usr/local/java  
export PATH=$PATH:$JAVA_HOME/bin 
export CLASSPATH=.:$JAVA_HOME/lib/tools.jar

3) /etc/profile 쉘에 적용

#source /etc/profile

4) 확인 

#java -version
#javac -version