linux安装Jdk

最简单的方法:yum install java-1.8.0-openjdk* -y

安装jdk的方法(Bin型)**************************************************************

将jdk-6u39-linux-x64.bin拷贝到/D/programfiles/下
修改权限: chmod +x jdk-6u39-linux-x64.bin
运行Bin: ./jdk-6u39-linux-x64.bin
重命名文件夹: mv jdk1.6.0_39 Jdkx64

安装jdk的方法(RpmBin型)***********************************************************

首先,下载好jdk的Linux版本安装包jdk-6u33-linux-i586-rpm.bin

修改权限:chmod +x jdk-6u33-linux-i586-rpm.bin
解压并安装包:./jdk-6u33-linux-i586-rpm.bin

安装过程如下,尽然是全自动化的:
[root@localhost java]# ./jdk-6u33-linux-i586-rpm.bin

Unpacking...
Checksumming...
Extracting...
UnZipSFX 5.50 of 17 February 2002, by Info-ZIP (Zip-Bugs@lists.wku.edu).
  inflating: jdk-6u33-linux-i586.rpm 
  inflating: sun-javadb-common-10.6.2-1.1.i386.rpm 
  inflating: sun-javadb-core-10.6.2-1.1.i386.rpm 
  inflating: sun-javadb-client-10.6.2-1.1.i386.rpm 
  inflating: sun-javadb-demo-10.6.2-1.1.i386.rpm 
  inflating: sun-javadb-docs-10.6.2-1.1.i386.rpm 
  inflating: sun-javadb-javadoc-10.6.2-1.1.i386.rpm 
Preparing...                ########################################### [100%]
   1:jdk                    ########################################### [100%]
Unpacking JAR files...
        rt.jar...
        jsse.jar...
        charsets.jar...
        tools.jar...
        localedata.jar...
        plugin.jar...
        javaws.jar...
        deploy.jar...
Installing JavaDB
Preparing...                ########################################### [100%]
   1:sun-javadb-common      ########################################### [ 17%]
   2:sun-javadb-core        ########################################### [ 33%]
   3:sun-javadb-client      ########################################### [ 50%]
   4:sun-javadb-demo        ########################################### [ 67%]
   5:sun-javadb-docs        ########################################### [ 83%]
   6:sun-javadb-javadoc     ########################################### [100%]

Java(TM) SE Development Kit 6 successfully installed.

Product Registration is FREE and includes many benefits:
* Notification of new versions, patches, and updates
* Special offers on Oracle products, services and training
* Access to early releases and documentation

Product and system data will be collected. If your configuration
supports a browser, the JDK Product Registration form will
be presented. If you do not register, none of this information
will be saved. You may also register your JDK later by
opening the register.html file (located in the JDK installation
directory) in a browser.

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how it is managed and used, see:
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按回车继续:
Done.
检查新版本的jdk:
[root@localhost java]# java -version
java version “1.6.0_33”
Java™ SE Runtime Environment (build 1.6.0_33-b04)
Java HotSpot™ Client VM (build 20.8-b03, mixed mode, sharing)

卸载Jdk******************************************************************************

(1)卸载系统自带的jdk版本:
查看自带的jdk:
#rpm -qa | grep gcj
看到类似如下信息:
java-1.4.2-gcj-compat-1.4.2.0-40jpp.115
使用rpm -e --nodeps 命令删除上面查找的内容:
(2)卸载rpm安装的jdk版本
查看安装的jdk:
#rpm -qa | grep jdk
看到如下信息:
jdk-1.6.0_22-fcs
卸载:
#rpm -e --nodeps jdk-1.6.0_22-fcs

卸载Jdk方法二******************************************************************************

(3)卸载jdk的另一种方法
[root@localhost soft]# java -version
java version “1.4.2”
gij (GNU libgcj) version 4.1.2 20071124 (Red Hat 4.1.2-42)
[root@localhost soft]# rpm -qa | grep jdk
[root@localhost soft]# rpm -qa | grep gcj
libgcj-4.1.2-42.el5
java-1.4.2-gcj-compat-1.4.2.0-40jpp.115
上面先确认jdk的具体版本号,然后
[root@localhost jdk1.6.0_11]# yum -y remove java-1.4.2-gcj-compat-1.4.2.0-40jpp.115
Setting up Remove Process
Resolving Dependencies………(开始卸载)
Removed: java-1.4.2-gcj-compat.i386 0:1.4.2.0-40jpp.115
Dependency Removed: antlr.i386 0:2.7.6-4jpp.2 bsf.i386 0:2.3.0-11jpp.1 bsh.i386 0:1.3.0-9jpp.1
gjdoc.i386 0:0.7.7-12.el5 hsqldb.i386 1:1.8.0.9-1jpp.2
Complete!(卸载完成)