Linux下配置JDK實(shí)際上是很簡單的，我按照網(wǎng)上的教程進(jìn)行如下配置，在 /etc/profile 文件中最后添加：

export JAVA_HOME=/home/son/jdk1.8.0_144

export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

export PATH=$JAVA_HOME/bin:$PATH

通過命令啟用java環(huán)境：

source /etc/profile

但是有一個(gè)問題比較惡心，那就是JDK環(huán)境變量失效的問題，

關(guān)閉設(shè)置好的bash后重新打開，java環(huán)境變量就無效了

root@ubuntu:/home/son/apache-tomcat-8.5.20/bin# ./shutdown.sh

Neither the JAVA_HOME nor the JRE_HOME environment variable is defined

At least one of these environment variable is needed to run this program

root@ubuntu:/home/son/apache-tomcat-8.5.20/bin# java -version

bash: java: command not found

經(jīng)大神指點(diǎn)， /etc/profile 文件修改一下，刪除 export 就行。

JAVA_HOME=/home/son/jdk1.8.0_144

CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

PATH=$JAVA_HOME/bin:$PATH

需要再啟用一下

source /etc/profile

再運(yùn)行一下java

root@ubuntu:/etc# java

Usage: java [-options] class [args...]

(to execute a class)

or java [-options] -jar jarfile [args...]

(to execute a jar file)

where options include:

-d32 use a 32-bit data model if available

-d64 use a 64-bit data model if available

-server to select the "server" VM

The default VM is server,

because you are running on a server-class machine.

-cp

-classpath

A : separated list of directories, JAR archives,

and ZIP archives to search for class files.

-D=

set a system property

-verbose:[class|gc|jni]

enable verbose output

-version print product version and exit

-version:

Warning: this feature is deprecated and will be removed

in a future release.

require the specified version to run

-showversion print product version and continue

-jre-restrict-search | -no-jre-restrict-search

Warning: this feature is deprecated and will be removed

in a future release.

include/exclude user private JREs in the version search

-? -help print this help message

-X print help on non-standard options

-ea[:...|:]

-enableassertions[:...|:]

enable assertions with specified granularity

-da[:...|:]

-disableassertions[:...|:]

disable assertions with specified granularity

-esa | -enablesystemassertions

enable system assertions

-dsa | -disablesystemassertions

disable system assertions

-agentlib:[=]

load native agent library , e.g. -agentlib:hprof

see also, -agentlib:jdwp=help and -agentlib:hprof=help

-agentpath:[=]

load native agent library by full pathname

-javaagent:[=]

load Java programming language agent, see java.lang.instrument

-splash:

show splash screen with specified image

See http://www.oracle.com/technetwork/java/javase/documentation/index.html for more details.

OK!

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