package com.c3p0.jndi;import java.io.IOException;import java.sql.Connection;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;import javax.naming.InitialContext;import javax.naming.NamingException;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.sql.DataSource;@WebServlet("/Testc3p0")public class Testc3p0 extends HttpServlet {    private static final long serialVersionUID = 1L;    public Testc3p0() {        super();    }    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        ResultSet rs = null;        try {            //此类是执行命名操作的初始上下文。用于解析该 URL            InitialContext ctx = new InitialContext();            //lookup检索配置。            DataSource ds = (DataSource)ctx.lookup("java:comp/env/jdbc/mysql");            //获取连接            Connection con = ds.getConnection();            /*Statement stmt = con.createStatement();            rs = stmt.executeQuery("select count(*) as ant from user");            while(rs.next()){                if(rs!=null){                    System.out.println(rs.getInt("ant"));                }            }*/            System.out.println(ds.getConnection());        } catch (NamingException e) {            e.printStackTrace();        } catch (SQLException e) {            e.printStackTrace();        }    }    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {                doGet(request, response);    }}