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【转】Linux如何查看JDK的安装路径

2017-08-28 16:49 405 查看
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

javaversion"1.7.0_65"

OpenJDKRuntimeEnvironment(rhel-2.5.1.2.el6_5-x86_64u65-b17)

OpenJDK64-BitServerVM(build24.65-b04,mixedmode)

[root@localhost~]#echo$JAVA_HOME





2：whichjava

首先要申明一下whichjava是定位不到安装路径的。whichjava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：

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


javaversion"1.7.0_65"


OpenJDKRuntimeEnvironment(rhel-2.5.1.2.el6_5-x86_64u65-b17)


OpenJDK64-BitServerVM(build24.65-b04,mixedmode)


[root@localhost~]#whichjava


/usr/bin/java


[root@localhost~]#ls-lrt/usr/bin/java


lrwxrwxrwx.1rootroot22Aug1715:12/usr/bin/java->/etc/alternatives/java


[root@localhost~]#ls-lrt/etc/alternatives/java


lrwxrwxrwx.1rootroot46Aug1715:12/etc/alternatives/java->/usr/lib/jvm/jre-1.7.0-openjdk.x86_64/bin/java


[root@localhost~]#


[root@localhost~]#cd/usr/lib/jvm


[root@localhostjvm]#ls


java-1.6.0-openjdk-1.6.0.0.x86_64java-1.7.0-openjdk-1.7.0.65.x86_64jrejre-1.6.0jre-1.6.0-openjdk.x86_64jre-1.7.0jre-1.7.0-openjdk.x86_64jre-openjdk


[root@localhostjvm]#

[/code]
[/code]




whereisjava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-qlpackagename

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–qlpackagename也是有一定局限性的。

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

javaversion"1.7.0_65"

OpenJDKRuntimeEnvironment(rhel-2.5.1.2.el6_5-x86_64u65-b17)

OpenJDK64-BitServerVM(build24.65-b04,mixedmode)

[root@localhost~]#rpm-qa|grepjava

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-qljava-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--

[/code]
[/code]



                                            

                                        

                        
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