Linux服务器安装JDK的步骤：
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1.利用SSH工具上传下载好的JDK
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cd D:\Program Files\SSH Communications Security\SSH Secure Shell
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scp2.exe C:\Users\Administrator\Desktop\jdk-7u75-linux-x64.rpm root@121.41.82.62:/root
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Are you sure you want to continue connecting (yes/no)? yes
root@121.41.82.62‘s password:
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2.在Linux端安装jdk
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cd /root
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chmod +x jdk-7u75-linux-x64.rpm
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rpm -ivh jdk-7u75-linux-x64.rpm
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3.配置环境变量，并验证是否安装成功
vi /etc/profile
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JAVA_HOME=/usr/java/jdk1.7.0_75
CLASSPATH=.:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar
PATH=$JAVA_HOME/bin:$PATH
export JAVA_HOME CLASSPATH PATH
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java -version
javac -version
原文：http://qiangjiyi.iteye.com/blog/2183842