1：context.xml

2:web.xml

             
      
       Oracle 数据库连接池
              
      
       jdbcoracle
              
      
       javax.sql.DataSource
              
      
       Container
          
     

3:TestServlet.java

protected void processRequest(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        response.setContentType("text/html;charset=UTF-8");        PrintWriter out = response.getWriter();                try {            InitialContext  ctx = new InitialContext();            DataSource ds = (DataSource) ctx.lookup("java:comp/env/jdbcoracle");            Connection conn = ds.getConnection();            out.print("数据源测试联接成功:"+conn);        } catch (NamingException | SQLException ex) {            Logger.getLogger(TestServlet.class.getName()).log(Level.SEVERE, null, ex);        }            }