Linux如何查看JDK的安装路径

超、凢脫俗 2022-05-28 11:42 281阅读 0赞

如何在一台Linux服务器上查找JDK的安装路径呢？ 有那些方法可以查找定位JDK的安装路径？是否有一些局限性呢？ 下面总结了一下如何查找JDK安装路径的方法。

1：echo $JAVA\_HOME

使用$JAVA\_HOME的话能定位JDK的安装路径的前提是配置了环境变量$JAVA\_HOME，否则如下所示，根本定位不到JDK的安装路径

\[root@localhost ~\]\# java -version

java version "1.7.0\_65"

OpenJDK Runtime Environment (rhel-2.5.1.2.el6\_5-x86\_64 u65-b17)

OpenJDK 64-Bit Server VM (build 24.65-b04, mixed mode)

\[root@localhost ~\]\# echo $JAVA\_HOME

2：which java

首先要申明一下which java是定位不到安装路径的。which java定位到的是java程序的执行路径。网上的资料都是人云亦云，完全不去思考。那么怎么定位到java的安装路径呢？下面我们来看看例子吧,如下所示：

\[root@localhost ~\]\# java -version  
   
java version "1.7.0\_65"  
   
OpenJDK Runtime Environment (rhel-2.5.1.2.el6\_5-x86\_64 u65-b17)  
   
OpenJDK 64-Bit Server VM (build 24.65-b04, mixed mode)  
   
\[root@localhost ~\]\# which java  
   
/usr/bin/java  
   
\[root@localhost ~\]\# ls -lrt /usr/bin/java  
   
lrwxrwxrwx. 1 root root 22 Aug 17 15:12 /usr/bin/java -> /etc/alternatives/java  
   
**\[root@localhost ~\]\# ls -lrt /etc/alternatives/java**  
   
lrwxrwxrwx. 1 root root 46 Aug 17 15:12 /etc/alternatives/java -> /usr/lib/jvm/jre-1.7.0-openjdk.x86\_64/bin/java  
   
\[root@localhost ~\]\#   
   
\[root@localhost ~\]\# cd /usr/lib/jvm  
   
\[root@localhost jvm\]\# ls  
   
java-1.6.0-openjdk-1.6.0.0.x86\_64 java-1.7.0-openjdk-1.7.0.65.x86\_64 jre jre-1.6.0 jre-1.6.0-openjdk.x86\_64 jre-1.7.0 jre-1.7.0-openjdk.x86\_64 jre-openjdk  
   
\[root@localhost jvm\]\#

whereis java 也是如此，它本身不能定位到安装路径。可以通过上面例子去定位安装路径

3： rpm -ql packagename

如果JDK是源码安装的话，那么这个方法也是行不通的。也就是说rpm –ql packagename也是有一定局限性的。

\[root@localhost ~\]\# java -version  
java version "1.7.0\_65"  
OpenJDK Runtime Environment (rhel-2.5.1.2.el6\_5-x86\_64 u65-b17)  
OpenJDK 64-Bit Server VM (build 24.65-b04, mixed mode)  
\[root@localhost ~\]\# rpm -qa | grep java  
tzdata-java-2014g-1.el6.noarch  
java-1.6.0-openjdk-1.6.0.0-11.1.13.4.el6.x86\_64  
java-1.7.0-openjdk-1.7.0.65-2.5.1.2.el6\_5.x86\_64  
\[root@localhost ~\]\# rpm -ql java-1.7.0-openjdk-1.7.0.65-2.5.1.2.el6\_5.x86\_64 | more  
/etc/.java  
/etc/.java/.systemPrefs  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jaas-1.7.0.65.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jaas-1.7.0.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jaas.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jce-1.7.0.65.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jce-1.7.0.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jce.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jdbc-stdext-1.7.0.65.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jdbc-stdext-1.7.0.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jdbc-stdext-3.0.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jdbc-stdext.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jndi-1.7.0.65.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jndi-1.7.0.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jndi-cos-1.7.0.65.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jndi-cos-1.7.0.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jndi-cos.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jndi-ldap-1.7.0.65.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jndi-ldap-1.7.0.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jndi-ldap.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jndi-rmi-1.7.0.65.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jndi-rmi-1.7.0.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jndi-rmi.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jndi.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jsse-1.7.0.65.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jsse-1.7.0.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/jsse.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/sasl-1.7.0.65.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/sasl-1.7.0.jar  
/usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86\_64/sasl.jar  
/usr/lib/jvm-exports/jre-1.7.0-openjdk.x86\_64  
/usr/lib/jvm-private/java-1.7.0-openjdk.x86\_64  
/usr/lib/jvm-private/java-1.7.0-openjdk.x86\_64/jce  
/usr/lib/jvm-private/java-1.7.0-openjdk.x86\_64/jce/vanilla  
/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86\_64  
/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86\_64/ASSEMBLY\_EXCEPTION  
/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86\_64/LICENSE  
/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86\_64/THIRD\_PARTY\_README  
/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86\_64/jre  
/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86\_64/jre/bin  
/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86\_64/jre/bin/java  
/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86\_64/jre/bin/keytool  
/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86\_64/jre/bin/orbd  
/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86\_64/jre/bin/pack200  
/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86\_64/jre/bin/policytool

/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86\_64/jre/bin/rmid

/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86\_64/jre/bin/rmiregistry

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export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.144-0.b01.el7_4.x86_64
    export JRE_HOME=${JAVA_HOME}/jre
    export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
    export PATH=${JAVA_HOME}/bin:$PATH