咔叽游戏

 找回密码
 立即注册

QQ登录

只需一步,快速开始

搜索
查看: 391|回复: 0

[linux shell] 查看linux服务器上jdk的安装路径方法

[复制链接]
  • TA的每日心情
    无聊
    2019-6-2 14:11
  • 签到天数: 4 天

    [LV.2]圆转纯熟

    发表于 2021-12-31 17:34:56 | 显示全部楼层 |阅读模式
    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
    1. [root@localhost ~]# java -version
    2. java version "1.7.0_65"
    3. OpenJDK Runtime Environment (rhel-2.5.1.2.el6_5-x86_64 u65-b17)
    4. OpenJDK 64-Bit Server VM (build 24.65-b04, mixed mode)
    5. [root@localhost ~]# echo $JAVA_HOME
    复制代码
    查看linux服务器上jdk的安装路径方法-1.png

    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:
    1. [root@localhost ~]# java -version
    2. java version "1.7.0_65"
    3. OpenJDK Runtime Environment (rhel-2.5.1.2.el6_5-x86_64 u65-b17)
    4. OpenJDK 64-Bit Server VM (build 24.65-b04, mixed mode)
    5. [root@localhost ~]# which java
    6. /usr/bin/java
    7. [root@localhost ~]# ls -lrt /usr/bin/java
    8. lrwxrwxrwx. 1 root root 22 Aug 17 15:12 /usr/bin/java -> /etc/alternatives/java
    9. [root@localhost ~]# ls -lrt /etc/alternatives/java
    10. lrwxrwxrwx. 1 root root 46 Aug 17 15:12 /etc/alternatives/java -> /usr/lib/jvm/jre-1.7.0-openjdk.x86_64/bin/java
    11. [root@localhost ~]#
    12. [root@localhost ~]# cd /usr/lib/jvm
    13. [root@localhost jvm]# ls
    14. 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
    15. [root@localhost jvm]#
    复制代码
    查看linux服务器上jdk的安装路径方法-2.png

    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
    查看linux服务器上jdk的安装路径方法-3.png

    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。
    1. [root@localhost ~]# java -version
    2. java version "1.7.0_65"
    3. OpenJDK Runtime Environment (rhel-2.5.1.2.el6_5-x86_64 u65-b17)
    4. OpenJDK 64-Bit Server VM (build 24.65-b04, mixed mode)
    5. [root@localhost ~]# rpm -qa | grep java
    6. tzdata-java-2014g-1.el6.noarch
    7. java-1.6.0-openjdk-1.6.0.0-11.1.13.4.el6.x86_64
    8. java-1.7.0-openjdk-1.7.0.65-2.5.1.2.el6_5.x86_64
    9. [root@localhost ~]# rpm -ql java-1.7.0-openjdk-1.7.0.65-2.5.1.2.el6_5.x86_64 | more
    10. /etc/.java
    11. /etc/.java/.systemPrefs
    12. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64
    13. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jaas-1.7.0.65.jar
    14. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jaas-1.7.0.jar
    15. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jaas.jar
    16. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jce-1.7.0.65.jar
    17. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jce-1.7.0.jar
    18. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jce.jar
    19. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jdbc-stdext-1.7.0.65.jar
    20. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jdbc-stdext-1.7.0.jar
    21. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jdbc-stdext-3.0.jar
    22. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jdbc-stdext.jar
    23. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jndi-1.7.0.65.jar
    24. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jndi-1.7.0.jar
    25. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jndi-cos-1.7.0.65.jar
    26. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jndi-cos-1.7.0.jar
    27. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jndi-cos.jar
    28. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jndi-ldap-1.7.0.65.jar
    29. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jndi-ldap-1.7.0.jar
    30. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jndi-ldap.jar
    31. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jndi-rmi-1.7.0.65.jar
    32. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jndi-rmi-1.7.0.jar
    33. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jndi-rmi.jar
    34. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jndi.jar
    35. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jsse-1.7.0.65.jar
    36. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jsse-1.7.0.jar
    37. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/jsse.jar
    38. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/sasl-1.7.0.65.jar
    39. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/sasl-1.7.0.jar
    40. /usr/lib/jvm-exports/java-1.7.0-openjdk-1.7.0.65.x86_64/sasl.jar
    41. /usr/lib/jvm-exports/jre-1.7.0-openjdk.x86_64
    42. /usr/lib/jvm-private/java-1.7.0-openjdk.x86_64
    43. /usr/lib/jvm-private/java-1.7.0-openjdk.x86_64/jce
    44. /usr/lib/jvm-private/java-1.7.0-openjdk.x86_64/jce/vanilla
    45. /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86_64
    46. /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86_64/ASSEMBLY_EXCEPTION
    47. /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86_64/LICENSE
    48. /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86_64/THIRD_PARTY_README
    49. /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86_64/jre
    50. /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86_64/jre/bin
    51. /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86_64/jre/bin/java
    52. /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86_64/jre/bin/keytool
    53. /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86_64/jre/bin/orbd
    54. /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86_64/jre/bin/pack200
    55. /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86_64/jre/bin/policytool
    56. /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86_64/jre/bin/rmid
    57. /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.65.x86_64/jre/bin/rmiregistry
    58. --More--
    复制代码
    查看linux服务器上jdk的安装路径方法-4.png

    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
    1. [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
    1. [root@centos6 ~]# cd /usr/java/jdk1.7.0_80
    复制代码
    3、运行
    1. [root@centos6 jdk1.7.0_80]# ./bin/java -version
    复制代码
    结果如图:
    查看linux服务器上jdk的安装路径方法-5.png

    二:设置了环境变量

    1、任意目录执行
    1. [root@centos6 usr]# java -version
    复制代码
    结果如图:
    查看linux服务器上jdk的安装路径方法-6.png

    三:卸载jdk

    1. 确定JDK的版本:
    1. [root@centos6 lib]# rpm -qa|grep jdk
    2. [root@centos6 lib]# rpm -qa | grep gcj
    复制代码
    可能的结果是:
    1. jdk-1.7.0_80-fcs.x86_64
    2. libgcj-4.4.7-3.el6.x86_64
    复制代码
    2.然后卸载:
    1. [root@centos6 lib]# rpm -e --nodeps libgcj-4.4.7-3.el6.x86_64
    2. # 或者
    3. [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

    QQ|免责声明|小黑屋|手机版|Archiver|咔叽游戏

    GMT+8, 2024-3-29 14:01

    Powered by Discuz! X3.4

    © 2001-2023 Discuz! Team.

    快速回复 返回顶部 返回列表