1、编写context.xml 文件复制到 WebRoot/META_INF/context.xml

     
         
      
       WEB-INF/web.xml
          
      
     

2、复制相关的数据库jar文件到 WebRoot/WEB-INF/lib/目录下

3、 使用连接代码

<%@page import="java.sql.PreparedStatement"%><%@ page language="java" pageEncoding="utf-8"%><%@ page import="javax.naming.InitialContext"%><%@ page import="javax.naming.Context"%><%@ page import="javax.sql.DataSource"%><%@ page import="java.sql.Connection"%><%Context ctx = new InitialContext();DataSource ds = (DataSource)ctx.lookup("java:/comp/env/jdbc/oracle");Connection conn = ds.getConnection();PreparedStatement pst = conn.prepareStatement("create table t(t number)");pst.execute();pst.close();conn.close();out.print(conn);%>