linux查看java信息

查看java版本

[root@CSICN20RPT01 ~]# java -version

java version "1.7.0_45"

OpenJDK Runtime Environment (rhel-2.4.3.3.el6-x86_64 u45-b15)

OpenJDK 64-Bit Server VM (build 24.45-b08, mixed mode)

查看安装的JDK版本的RPM包

[root@CSICN20RPT01 ~]# rpm -qa|grep jdk

java-1.7.0-openjdk-1.7.0.45-2.4.3.3.el6.x86_64

java-1.6.0-openjdk-1.6.0.0-1.66.1.13.0.el6.x86_64

查看java的安装路径

方法一

[root@CSICN20RPT01 ~]# which java

/usr/bin/java

[root@CSICN20RPT01 ~]# ls -lrt /usr/bin/java

lrwxrwxrwx. 1 root root 22 May  8 05:55 /usr/bin/java -> /etc/alternatives/java

[root@CSICN20RPT01 ~]# ls -lrt /etc/alternatives/java

lrwxrwxrwx. 1 root root 46 May  8 05:55 /etc/alternatives/java -> /usr/lib/jvm/jre-1.7.0-openjdk.x86_64/bin/java

[root@CSICN20RPT01 ~]# cd /usr/lib/jvm

[root@CSICN20RPT01 jvm]# ls

java-1.6.0-openjdk-1.6.0.0.x86_64  java-1.7.0-openjdk-1.7.0.45.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

方法二

[root@CSICN20RPT01 jvm]# rpm -ql java-1.7.0-openjdk-1.7.0.45-2.4.3.3.el6.x86_64| more

..........................................................................................

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/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.45.x86_64/jre/bin/keytool

/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.45.x86_64/jre/bin/orbd

/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.45.x86_64/jre/bin/pack200

/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.45.x86_64/jre/bin/policytool

/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.45.x86_64/jre/bin/rmid

/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.45.x86_64/jre/bin/rmiregistry

/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.45.x86_64/jre/bin/servertool

/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.45.x86_64/jre/bin/tnameserv

/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.45.x86_64/jre/bin/unpack200

/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.45.x86_64/jre/lib

/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.45.x86_64/jre/lib/accessibility.properties

/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.45.x86_64/jre/lib/amd64

/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.45.x86_64/jre/lib/amd64/client

/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.45.x86_64/jre/lib/amd64/client/classes.jsa

/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.45.x86_64/jre/lib/amd64/headless

/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.45.x86_64/jre/lib/amd64/headless/libmawt.so

/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.45.x86_64/jre/lib/amd64/jli