超详细！Linux上安装Java JDK21 环境！ - ToB企服应用市场:ToB评测及商务社交产业平台

mkdir /usr/local/java

复制代码

tar -zxvf jdk-21_linux-64_bin.tar.gz -C /usr/local/java

复制代码

cd /usr/local/java

复制代码

[root@localhost java]# ls jdk-21.0.5/
bin conf include jmods legal lib LICENSE man README release

复制代码

rm -rf /usr/bin/java

复制代码

ln -s /usr/local/java/jdk-21.0.5/ /usr/bin/java

复制代码

vi /etc/profile

复制代码

export JAVA_HOME=/usr/bin/java
export PATH=$JAVA_HOME/bin:$PATH

复制代码

source /etc/profile

复制代码

java --version

复制代码

[root@localhost java]# java -version
java version "21.0.5" 2024-10-15 LTS
Java(TM) SE Runtime Environment (build 21.0.5+9-LTS-239)
Java HotSpot(TM) 64-Bit Server VM (build 21.0.5+9-LTS-239, mixed mode, sharing)

复制代码

[root@localhost java]# javac
Usage: javac <options> <source files>
where possible options include:
@<filename> Read options and filenames from file
-Akey[=value] Options to pass to annotation processors
--add-modules <module>(,<module>)*
Root modules to resolve in addition to the initial modules,
or all modules on the module path if <module> is ALL-MODULE-PATH.
--boot-class-path <path>, -bootclasspath <path>
Override location of bootstrap class files
--class-path <path>, -classpath <path>, -cp <path>
Specify where to find user class files and annotation processors
-d <directory> Specify where to place generated class files
-deprecation
Output source locations where deprecated APIs are used
--enable-preview
Enable preview language features.
To be used in conjunction with either -source or --release.
-encoding <encoding> Specify character encoding used by source files
-endorseddirs <dirs> Override location of endorsed standards path
-extdirs <dirs> Override location of installed extensions
-g Generate all debugging info
-g:{lines,vars,source} Generate only some debugging info
-g:none Generate no debugging info
-h <directory>
Specify where to place generated native header files
--help, -help, -? Print this help message
--help-extra, -X Print help on extra options
-implicit:{none,class}
Specify whether to generate class files for implicitly referenced files
-J<flag> Pass <flag> directly to the runtime system
--limit-modules <module>(,<module>)*
Limit the universe of observable modules
--module <module>(,<module>)*, -m <module>(,<module>)*
Compile only the specified module(s), check timestamps
--module-path <path>, -p <path>
Specify where to find application modules
--module-source-path <module-source-path>
Specify where to find input source files for multiple modules
--module-version <version>
Specify version of modules that are being compiled
-nowarn Generate no warnings
-parameters
Generate metadata for reflection on method parameters
-proc:{none,only,full}
Control whether annotation processing and/or compilation is done.
-processor <class1>[,<class2>,<class3>...]
Names of the annotation processors to run;
bypasses default discovery process
--processor-module-path <path>
Specify a module path where to find annotation processors
--processor-path <path>, -processorpath <path>
Specify where to find annotation processors
-profile <profile>
Check that API used is available in the specified profile.
This option is deprecated and may be removed in a future release.
--release <release>
Compile for the specified Java SE release.
Supported releases:
8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21
-s <directory> Specify where to place generated source files
--source <release>, -source <release>
Provide source compatibility with the specified Java SE release.
Supported releases:
8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21
--source-path <path>, -sourcepath <path>
Specify where to find input source files
--system <jdk>|none Override location of system modules
--target <release>, -target <release>
Generate class files suitable for the specified Java SE release.
Supported releases:
8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21
--upgrade-module-path <path>
Override location of upgradeable modules
-verbose Output messages about what the compiler is doing
--version, -version Version information
-Werror Terminate compilation if warnings occur

复制代码