直接上代码

package cn.sm1234.controller;

import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.SQLFeatureNotSupportedException;
import java.util.LinkedList;
import java.util.List;
import java.util.logging.Logger;

import javax.sql.DataSource;

import com.sun.istack.internal.Pool;

public class MyPool implements DataSource {
    
    /**创建一个容器存放数据库连接池*/
    static List<Connection> pool = new LinkedList<Connection>();
    
    /**静态类初始化数据库连接*/
    static{
        for (int i = 0; i < 10; i++) {
            //可以从工具类里面获取数据库的连接池， 如下：
            //Connection con = JDBCUtils.getConnection();
            pool.add(con);
        }
    }
    /**提供给外界connection方法，外界用来获取数据库连接*/
    public Connection getConnection() throws SQLException {
        //从连接池中移除一个对象并返回这个对象
        Connection conn = pool.remove(0);
        return conn;
    }
    /**提供一个返回连接的方法*/
    public void returnConnection(Connection conn) {
        try {
            if (conn!=null && !conn.isClosed()) {
                pool.add(conn);
            }
        } catch (Exception e) {
            // TODO: handle exception
        }
    }

    public PrintWriter getLogWriter() throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    public void setLogWriter(PrintWriter out) throws SQLException {
        // TODO Auto-generated method stub
        
    }

    public void setLoginTimeout(int seconds) throws SQLException {
        // TODO Auto-generated method stub
        
    }

    public int getLoginTimeout() throws SQLException {
        // TODO Auto-generated method stub
        return 0;
    }

    public Logger getParentLogger() throws SQLFeatureNotSupportedException {
        // TODO Auto-generated method stub
        return null;
    }

    public <T> T unwrap(Class<T> iface) throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    public boolean isWrapperFor(Class<?> iface) throws SQLException {
        // TODO Auto-generated method stub
        return false;
    }

    

    public Connection getConnection(String username, String password) throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }
    

}