Java Installation.txt

在CentOS 6.3 x64 测试

1.下载对应版本的JDK到Linux机器上：  

#
wget --no-cookies \
--no-check-certificate \
--header "Cookie: oraclelicense=accept-securebackup-cookie" \
"http://download.oracle.com/otn-pub/java/jdk/7u55-b13/jdk-7u55-linux-x64.rpm" \
-O /opt/jdk-7u55-linux-x64.rpm

如果网速太慢，超过30分钟会被服务器断掉
可以自己先下载了，然后使用scp再传上服务器

远程加密传输文件
scp local_file user_name@remote_server:path
scp ~/tomcat.tar.gz root@192.168.0.2:~/upload/


2.赋权限：

# chmod +x /opt/jdk-7u55-linux-x64.rpm

3.安装：

# rpm -Uvh /opt/jdk-7u55-linux-x64.rpm

4.设置java环境:
# alternatives --install /usr/bin/java java /usr/java/jdk1.7.0_55/jre/bin/java 20000
# alternatives --install /usr/bin/jar jar /usr/java/jdk1.7.0_55/bin/jar 20000
# alternatives --install /usr/bin/javac javac /usr/java/jdk1.7.0_55/bin/javac 20000
# alternatives --install /usr/bin/javaws javaws /usr/java/jdk1.7.0_55/jre/bin/javaws 20000
# alternatives --set java /usr/java/jdk1.7.0_55/jre/bin/java
# alternatives --set javaws /usr/java/jdk1.7.0_55/jre/bin/javaws
# alternatives --set javac /usr/java/jdk1.7.0_55/bin/javac
# alternatives --set jar /usr/java/jdk1.7.0_55/bin/jar

检查一下配置：

# ls -lA /etc/alternatives/{jar,java*}

5.是否成功安装JDK验证：

# java -version