多版本Java切换环境变量配置的三种方法(简单高效)

# 使用PowerShell安装
Invoke-WebRequest -Uri "https://github.com/jenv/jenv/releases/latest/download/jenv-windows.zip" -OutFile "jenv.zip"
Expand-Archive -Path "jenv.zip" -DestinationPath "C:\"

# 使用Homebrew安装
brew install jenv

# 下载并安装
git clone https://github.com/jenv/jenv.git ~/.jenv
echo 'export PATH="$HOME/.jenv/bin:$PATH"' >> ~/.bashrc
echo 'eval "$(jenv init -)"' >> ~/.bashrc
source ~/.bashrc

# 查看已安装的Java版本
/usr/libexec/java_home -V

# 添加Java 8
jenv add /Library/Java/JavaVirtualMachines/jdk1.8.0_291.jdk/Contents/Home

# 添加Java 11
jenv add /Library/Java/JavaVirtualMachines/jdk-11.0.12.jdk/Contents/Home

# 添加Java 17
jenv add /Library/Java/JavaVirtualMachines/jdk-17.0.3.jdk/Contents/Home

jenv versions

jenv global 1.8

jenv local 11

jenv shell 17

# 查看当前Java版本
java -version

# 查看jenv状态
jenv version

curl -s "https://get.sdkman.io" | bash
source "$HOME/.sdkman/bin/sdkman-init.sh"

sdk list java

# 安装Java 8
sdk install java 8.0.292-zulu

# 安装Java 11
sdk install java 11.0.12-open

# 安装Java 17
sdk install java 17.0.3-tem

sdk list java | grep installed

# 切换到Java 8
sdk use java 8.0.292-zulu

# 切换到Java 11
sdk use java 11.0.12-open

# 切换到Java 17
sdk use java 17.0.3-tem

sdk default java 11.0.12-open

sdk install java 8.0.301-oracle /path/to/your/jdk

nano ~/java_switch.sh

#!/bin/bash

# Java版本切换脚本
# 使用方法：source java_switch.sh <version>

JAVA8_HOME="/Library/Java/JavaVirtualMachines/jdk1.8.0_291.jdk/Contents/Home"
JAVA11_HOME="/Library/Java/JavaVirtualMachines/jdk-11.0.12.jdk/Contents/Home"
JAVA17_HOME="/Library/Java/JavaVirtualMachines/jdk-17.0.3.jdk/Contents/Home"

case $1 in
    "8")
        export JAVA_HOME=$JAVA8_HOME
        export PATH="$JAVA_HOME/bin:$PATH"
        echo "Switched to Java 8"
        ;;
    "11")
        export JAVA_HOME=$JAVA11_HOME
        export PATH="$JAVA_HOME/bin:$PATH"
        echo "Switched to Java 11"
        ;;
    "17")
        export JAVA_HOME=$JAVA17_HOME
        export PATH="$JAVA_HOME/bin:$PATH"
        echo "Switched to Java 17"
        ;;
    *)
        echo "Usage: source java_switch.sh [8|11|17]"
        echo "Current Java version:"
        java -version
        ;;
esac

echo "JAVA_HOME: $JAVA_HOME"

chmod +x ~/java_switch.sh

# 切换到Java 8
source ~/java_switch.sh 8

# 切换到Java 11
source ~/java_switch.sh 11

# 切换到Java 17
source ~/java_switch.sh 17

alias java8="source ~/java_switch.sh 8"
alias java11="source ~/java_switch.sh 11"
alias java17="source ~/java_switch.sh 17"

source ~/.bashrc

java8
java11
java17

java -version
javac -version

echo $JAVA_HOME
echo $PATH

which java
which javac

// Test.java
public class Test {
    public static void main(String[] args) {
        System.out.println("Java version: " + System.getProperty("java.version"));
        System.out.println("Java home: " + System.getProperty("java.home"));
    }
}

javac Test.java
java Test

# 重新加载配置文件
source ~/.bashrc
source ~/.zshrc

# 或者重新打开终端

# 确保Java bin目录在PATH中
echo $PATH | grep java

# 手动添加
export PATH="$JAVA_HOME/bin:$PATH"

# 检查权限
ls -la $JAVA_HOME

# 修改权限（如果需要）
sudo chown -R $USER:$USER $JAVA_HOME