[size=medium]<!-- 根据实际情况修改 -->
<Context>
    <Resource
        name="jdbc/test"
        type="javax.sql.DataSource"
        driverClassName="com.mysql.jdbc.Driver"
        url="jdbc:mysql://localhost:3306/test"
        username="root"
        password="root"/>
</Context>[/size]

package com.nantian.jndi;

import java.sql.Connection;
import java.sql.SQLException;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.sql.DataSource;

public class Test extends HttpServlet {
    public void init(ServletConfig config) throws ServletException {
        String jndi = config.getInitParameter("jndi");
        try {
            Context ctx = new InitialContext();
            DataSource ds = (DataSource) ctx.lookup(jndi);
            Connection conn = ds.getConnection();
            System.out.println("连接获取成功："+conn);
        } catch (NamingException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}