查看linux服務(wù)器上jdk的安裝路徑方法
發(fā)布日期：2022-01-28 15:02 | 文章來源：CSDN
查看linux服務(wù)器上jdk的安裝路徑方法
如何在一臺Linux服務(wù)器上查找JDK的安裝路徑呢？ 有那些方法可以查找定位JDK的安裝路徑？是否有一些局限性呢？ 下面總結(jié)了一下如何查找JDK安裝路徑的方法.
1：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(huán)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
2：which java
首先要申明一下which java是定位不到安裝路徑的。which java定位到的是java程序的執(zhí)行路徑。網(wǎng)上的資料都是人云亦云，完全不去思考。那么怎么定位到j(luò)ava的安裝路徑呢？下面我們來看看例子吧,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裝路徑?？梢酝ㄟ^上面例子去定位安裝路徑
3： rpm -ql packagename
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 ~]# 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--
Linux查看jdk版本、卸載jdk
一：沒有設(shè)置jdk環(huán)境變量
1、查看linux上jdk所在目錄
[root@centos6 ~]# echo $JAVA_HOME
得到j(luò)dk所在目錄 /usr/java/jdk1.7.0_80
2、進入jdk所在目錄
[root@centos6 ~]# cd /usr/java/jdk1.7.0_80
3、運行
[root@centos6 jdk1.7.0_80]# ./bin/java -version
結(jié)果如圖：
二：設(shè)置了環(huán)境變量
1、任意目錄執(zhí)行
[root@centos6 usr]# java -version
結(jié)果如圖：
三：卸載jdk
1. 確定JDK的版本：
[root@centos6 lib]# rpm -qa|grep jdk [root@centos6 lib]# rpm -qa | grep gcj
可能的結(jié)果是：
jdk-1.7.0_80-fcs.x86_64 libgcj-4.4.7-3.el6.x86_64
2.然后卸載：
[root@centos6 lib]# rpm -e --nodeps libgcj-4.4.7-3.el6.x86_64 # 或者 [root@centos6 lib]# rpm -e --nodeps jdk-1.7.0_80-fcs.x86_64
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