1.官网下载

网址：http://www.oracle.com

2.挑选自己需要的经jdk进行下载

Java Archive | Oracle 中国

如果是m芯片，推荐下载arm版本。

3.安装

直接一路下一步即可

4.配置环境变量

查看安装位置

# 进入 JDK 安装目录
cd /Library/Java/JavaVirtualMachines
 
# 查看文件
ls
➜  jdk-1.8.jdk	jdk-11.jdk
 
# 查看路径
pwd
➜  /Library/Java/JavaVirtualMachines

配置环境变量文件

# 进入当前用户的 home 目录
cd /Users/xxx    xxx改为自己的电脑用户名称
 
# 输入
cd ~
 
# 打开环境变量配置文件
vi ～/.bash_profile

如果只有一个jdk，按照下方配置

# JDK Config
JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk-1.8.jdk/Contents/Home
CLASS_PATH="$JAVA_HOME/lib"
PATH="$PATH:$JAVA_HOME/bin"

多个jdk，按照下方

# JDK Config
JAVA_HOME_8=/Library/Java/JavaVirtualMachines/jdk-1.8.jdk/Contents/Home
JAVA_HOME_11=/Library/Java/JavaVirtualMachines/jdk-11.jdk/Contents/Home
JAVA_HOME_17=/Library/Java/JavaVirtualMachines/jdk-17.jdk/Contents/Home
 
export JAVA_HOME=$JAVA_HOME_8
alias jdk8="export JAVA_HOME=$JAVA_HOME_8 && echo current JDK has switched to oracle jdk version 1.8. && java -version"
alias jdk11="export JAVA_HOME=$JAVA_HOME_11 && echo current JDK has switched to openjdk version 11. && java -version"
alias jdk17="export JAVA_HOME=$JAVA_HOME_17 && echo current JDK has switched to openjdk version 17. && java -version"
 
CLASS_PATH="$JAVA_HOME/lib"
PATH="$PATH:$JAVA_HOME/bin"

将配置生效

# 配置文件立即生效
source ~/.bash_profile
 
# 验证：查看 JAVA_HOME 目录
echo $JAVA_HOME
 
# 查看 JDK 版本信息
java -version

快速切换jdk版本

xxx@xxxdeMacBook-Air ~ % jdk8
current JDK has switched to oracle jdk version 1.8.
java version "1.8.0_391"
Java(TM) SE Runtime Environment (build 1.8.0_391-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.391-b13, mixed mode)
 
xxx@xxxdeMacBook-Air ~ % java -version
java version "1.8.0_391"
Java(TM) SE Runtime Environment (build 1.8.0_391-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.391-b13, mixed mode)
 
xxx@xxxdeMacBook-Air ~ % jdk11
current JDK has switched to openjdk version 11.
java version "11.0.21" 2023-10-17 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.21+9-LTS-193)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.21+9-LTS-193, mixed mode)
 
xxx@xxxdeMacBook-Air ~ % java -version
java version "11.0.21" 2023-10-17 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.21+9-LTS-193)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.21+9-LTS-193, mixed mode)

5.扩展

配置maven

1.打开终端

vim ~/.zshrc

2.按 i 进行编辑

export M2_HOME=/Users/xxx/Downloads/maven/apache-maven-3.9.9

export PATH=$PATH:$M2_HOME/bin

3.保存

1.esc

2.输入 :wq

4.执行命令

source ~/.bash_profile

5.重新打开终端

输入 mvn -v 进行验证