Java 설치

1 개요[ | ]

Java 설치

JDK(Java Development Kit)은 Oracle JDK(유료), openjdk(무료)가 있다.
특별히 준비된 라이선스가 없다면 openjdk를 사용하자.

파일 다운로드
- https://jdk.java.net/ -> Ready for use : JDK -> Windows / x64 외 Linux / x64 등등

윈도우 설치 방법
- Download 후 C:\Program Files\openjdk\ 내 압축 풀기
- 환경 변수 설정
  - [윈도우키 + r ] - sysdm.cpl - "고급" 탭 - "환경 변수"
  - JAVA_HOME / C:\Program Files\openjdk\ 설정 후 저장

linux 설치 방법 ( CentOS7 기준 )

[root@localhost ~]# wget https://download.java.net/java/GA/jdk16.0.2/d4a915d82b4c4fbb9bde534da945d746/7/GPL/openjdk-16.0.2_linux-x64_bin.tar.gz
--2021-08-22 16:08:40--  https://download.java.net/java/GA/jdk16.0.2/d4a915d82b4c4fbb9bde534da945d746/7/GPL/openjdk-16.0.2_linux-x64_bin.tar.gz
Resolving download.java.net (download.java.net)... 104.75.0.42
Connecting to download.java.net (download.java.net)|104.75.0.42|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 184349266 (176M) [application/x-gzip]
Saving to: ‘openjdk-16.0.2_linux-x64_bin.tar.gz’

100%[===========================================================================================================>] 184,349,266 11.1MB/s   in 16s    

2021-08-22 16:08:56 (10.9 MB/s) - ‘openjdk-16.0.2_linux-x64_bin.tar.gz’ saved [184349266/184349266]

[root@localhost ~]#
[root@localhost ~]# mkdir -p /usr/java/openjdk
[root@localhost ~]# cd /usr/java/openjdk
[root@localhost openjdk]# mv /root/openjdk-16.0.2_linux-x64_bin.tar.gz ./
[root@localhost openjdk]# tar -xzvf openjdk-16.0.2_linux-x64_bin.tar.gz 
~ 생략 ~
[root@localhost ~]# tail /etc/profile // 아래 내용 추가
# OpenJDK 16
JAVA_HOME=/usr/java/openjdk/jdk-16.0.2
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
export JAVA_HOME
export PATH
[root@localhost ~]# 
[root@localhost ~]# echo $JAVA_HOME
/usr/java/openjdk/jdk-16
[root@localhost ~]# 
[root@localhost ~]# java --version
openjdk 16.0.2 2021-07-20
OpenJDK Runtime Environment (build 16.0.2+7-67)
OpenJDK 64-Bit Server VM (build 16.0.2+7-67, mixed mode, sharing)
[root@localhost ~]#

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