4、DAO接口实现类：

package com.song.Impl;
import java.sql.*;
import com.song.DAO.RegisterDAO;
import com.song.VO.RegisterBean;
import com.song.DB.*;

public class RegisterImpl implements RegisterDAO{

	public void insert(RegisterBean registerBean)throws Exception{
		String sql = "insert into register(username,password,email) values (?,?,?)";
		PreparedStatement pstmt = null;
		Connection conn = null;
		DataBaseConnection dbconn = null;
		try{
			dbconn = new DataBaseConnection();
			conn = dbconn.getConn();
			pstmt = conn.prepareStatement(sql);
			pstmt.setString(1,registerBean.getUsername());
			pstmt.setString(2,registerBean.getPassword());
			pstmt.setString(3,registerBean.getEmail());
			pstmt.executeUpdate();
			pstmt.close();
			conn.close();
		}catch(Exception e){
			System.out.println("数据插入失败！");
			e.printStackTrace();
		}finally{
			dbconn.close();
		}
	}
}