baseservlet.java

用户管理的系统设计

package servlet;

import java.io.IOException;
import java.sql.Connection;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import util.ConManager;
import facade.FareFacade;

public abstract class Baseservlet extends HttpServlet 
{
	private static final String CONTENT_TYPE = "text/html; charset=GBK";
	private static FareFacade farefacade;
	
    public static FareFacade getFacade()
	{
		return farefacade;
	}

	public static void setFacade(FareFacade farefacade)
	{
		Baseservlet.farefacade = farefacade;
	}

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		response.setContentType(CONTENT_TYPE);
		this.doPost(request, response);
	}

	
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException 
	{
		request.setCharacterEncoding("gbk");
		response.setCharacterEncoding("gbk");
		Connection con = null;
		try
		{
			if(farefacade==null)
			{
				farefacade = new FareFacade();
			}
			
			con=ConManager.getConnection();
			//开始事务
			con.setAutoCommit(false);
			//request.setAttribute("farecitys",getFacade().getAllCity(con));
			String filename = process(con,request,response);
			con.commit();//提交事务
			
			request.getRequestDispatcher(filename).forward(request, response);
			
		}
		catch(Exception e)
		{
			e.printStackTrace();
			try
			{
				con.rollback();
			}
			catch(Exception ex)
			{
				ex.printStackTrace();
			}
		}
		finally
		{
			try {
				con.close();
			} catch (SQLException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
		}
	}
	protected abstract String process(Connection con,HttpServletRequest request, HttpServletResponse response)
	throws Exception;
}