TA的每日心情 | 无聊 2019-6-2 14:11 |
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签到天数: 4 天 [LV.2]圆转纯熟
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查看linux服务器上jdk的安装路径方法
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]#
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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
- --More--
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Linux查看jdk版本、卸载jdk
一:没有设置jdk环境变量
1、查看linux上jdk所在目录- [root@centos6 ~]# echo $JAVA_HOME
复制代码 得到jdk所在目录 /usr/java/jdk1.7.0_80
2、进入jdk所在目录- [root@centos6 ~]# cd /usr/java/jdk1.7.0_80
复制代码 3、运行- [root@centos6 jdk1.7.0_80]# ./bin/java -version
复制代码 结果如图:
二:设置了环境变量
1、任意目录执行- [root@centos6 usr]# java -version
复制代码 结果如图:
三:卸载jdk
1. 确定JDK的版本:- [root@centos6 lib]# rpm -qa|grep jdk
- [root@centos6 lib]# rpm -qa | grep gcj
复制代码 可能的结果是:- jdk-1.7.0_80-fcs.x86_64
- libgcj-4.4.7-3.el6.x86_64
复制代码 2.然后卸载:- [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
复制代码 以上为个人经验,希望能给大家一个参考,也希望大家多多支持咔叽论坛。
原文地址:https://www.jb51.net/article/228544.htm |
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