linux查看jdk安裝路徑的方法：1、使用“echo $JAVA_HOME”命令，可獲取環境變量“$JAVA_HOME”配置的jdk路徑；2、使用“rpm -qa | grep java”命令，通過獲取安裝包的路徑來查看jdk安裝路徑。
本教程操作環境：linux5.9.8系統、Dell G3電腦。
linux查看jdk安裝路徑
方法1：使用echo $JAVA_HOME
使用$JAVA_HOME的話能定位JDK的安裝路徑的前提是配置了環境變量$JAVA_HOME，否則如下所示，根本定位不到JDK的安裝路徑
[root@localhost?~]#?java?-version java?version?"1.7.0_65" OpenJDK?Runtime?Environment?(rhel-2.5.1.2.el6_5-x86_64?u65-b17) OpenJDK?64-Bit?Server?VM?(build?24.65-b04,?mixed?mode) [root@localhost?~]#?echo?$JAVA_HOME
方法2：使用rpm -qa | grep java
如果JDK是源碼安裝的話，那么這個方法也是行不通的。也就是說rpm –ql packagename也是有一定局限性的。
[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--
擴展知識：
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查看java版本號–使用java -version
[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)
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查看jdk的執行路徑–使用which java
which java定位到的是java程序的執行路徑。網上的資料都是人云亦云，完全不去思考。那么怎么定位到java的安裝路徑呢？下面我們來看看例子吧,如下所示：
[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裝路徑。可以通過上面例子去定位安裝路徑
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