• 【转】Linux如何查看JDK的安装路径

    http://www.cnblogs.com/kerrycode/archive/2015/08/27/4762921.html

    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

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    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]#

    clip_image002

    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

    clip_image003

    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
    --More--

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  • 原文地址：https://www.cnblogs.com/exmyth/p/7444562.html
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