首先Java下根据JDBC规范连接数据库，有几种形式，参考
http://djdnmq.iteye.com/blog/356468 oracle 驱动oci thin 区别
Oracle客户端准备
10201_client_linux32.zip
安装完成后，需要确保在终端中可以正确的执行sqlplus命令
Oracle环境变量
如果Tomcat是服务，需要把Oracle的安装环境变量写到TOMCAT中，类似如下
Tomcat加入/home/**/apache-tomcat-6.0.35/bin/catalina.sh开头，当前的用户加入：.bash_profile的末尾，具体的内容如下：
export ORACLE_HOME=/home/ ** /oracle/product/10.2.0/client_1
export ORACLE_BASE=/home/ ** /oracle/product/10.2.0
export PATH=$ORACLE_HOME/bin:$PATH
export LD_LIBRARY_PATH=$ORACLE_HOME:$ORACLE_HOME/lib:$ORACLE_HOME/jdbc/lib:${LD_LIBRARY_PATH}
建立到目标数据库的TNS连接
类似在/home/**/oracle/product/10.2.0/client_1/bin执行./netmgr
建立到目标数据库的TNS名字，此时就可以使用JDBC的OCI形式访问Oracle数据库了
Web容器访问Oracle出现如下错误的一些参考资料
no ocijdbc10 in java.library.path
https://forums.oracle.com/forums/thread.jspa?threadID=290097
https://forums.oracle.com/forums/thread.jspa?threadID=615281
- JDBC Thin Driver100% Java client-side JDBC driver for use in client applications, middle-tier servers and applets.
- JDBC OCI Driver
Client-side JDBC driver for use on a machine where OCI is installed.
- JDBC Thin Server-side Driver
JDBC driver for use in Java program in the database to access remote Oracle databases.
- JDBC Server-side Internal Driver Server-side JDBC driver for use by Java Stored procedures. This driver used to be called the "JDBC Kprb Driver".
http://www.oracle.com/technetwork/database/enterprise-edition/jdbc101040-094982.html
https://forums.oracle.com/forums/thread.jspa?threadID=290097