linux centos 卸载jdk

1.先看看OpenJDK的安装包

$ rpm -qa |grep java

tzdata-java-2013b-1.el6.noarch

java-1.6.0-openjdk-1.6.0.0-1.61.1.11.11.el6_4.x86_64

java-1.7.0-openjdk-1.7.0.19-2.3.9.1.el6_4.x86_64

2.检查OpenJDK版本号

$ java -version

java version "1.7.0_19"

OpenJDK Runtime Environment (rhel-2.3.9.1.el6_4-x86_64)

OpenJDK 64-Bit Server VM (build 23.7-b01, mixed mode)





3.卸载Openjdk

用root用户登录终端

$ su root

password:

$ rpm -e --nodeps java-1.7.0-openjdk-1.7.0.19-2.3.9.1.el6_4.x86_64

$ rpm -e --nodeps java-1.6.0-openjdk-1.6.0.0-1.61.1.11.11.el6_4.x86_64

$ rpm -e --nodeps tzdata-java-2013b-1.el6.noarch

 

4安装jdk-7u17-linux-x64.rpm

下载地址：http://pan.baidu.com/share/link?shareid=397488&uk=638583574

$ cd /jdk1.7所在文件夹

$ rpm -ivh jdk-7u17-linux-x64.rpm

Preparing...                ########################################### [100%]

   1:jdk                    ########################################### [100%]

Unpacking JAR files...

    rt.jar...

Error: Could not open input file: /usr/java/jdk1.7.0_17/jre/lib/rt.pack

    jsse.jar...

Error: Could not open input file: /usr/java/jdk1.7.0_17/jre/lib/jsse.pack

    charsets.jar...

Error: Could not open input file: /usr/java/jdk1.7.0_17/jre/lib/charsets.pack

    tools.jar...

Error: Could not open input file: /usr/java/jdk1.7.0_17/lib/tools.pack

    localedata.jar...

Error: Could not open input file: /usr/java/jdk1.7.0_17/jre/lib/ext/localedata.pack

以上那些错误能够忽略，不影响jdk到安装和使用

5.配置环境变量

$vi /etc/profile

输入o，在最后增加下面内容：

JAVA_HOME=/usr/java/jdk1.7.0_17

JRE_HOME=/usr/java/jdk1.7.0_17/jre

PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin

CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib

export JAVA_HOME JRE_HOME PATH CLASSPATH

使环境变量马上生效

$source /etc/profile

6.測试安装是否成功

依次输入java,java -version,javac，看到输出信息就可以,比如

[root@chenpc-cent tools]# java -version

java version "1.7.0_17"

Java(TM) SE Runtime Environment (build 1.7.0_17-b02)

Java HotSpot(TM) 64-Bit Server VM (build 23.7-b01, mixed mode)