logon.java

一些数据库的java开发编程

package jdbcbook.msgboard;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.Collection;

import jdbcbook.pub.util.*;

/**
 * 用户登录处理方法
 */
public class Logon extends HttpServlet 
{

	public void doPost(HttpServletRequest request, HttpServletResponse response)
		throws IOException, ServletException
	{
		// 取得用户提交的用户名和密码
		String username = request.getParameter( "username" );
		String password = request.getParameter( "password" );

		// 进行用户合法性验证
		UserInfo user = UserBean.logon( username, password );

		// 对登录结果进行处理
		RequestDispatcher dispatcher = null;
		if( user!=null )
		{
			// 验证通过
			HttpSession session = request.getSession();
			session.setAttribute( "session_userinfo", user );

			// 跳转到留言列表Servlet
			dispatcher = request.getRequestDispatcher( "articlelist" );
		}
		else
		{
			// 设置错误提示信息
			RequestUtil.setMsg( this, request, "logonfailed" );
			// 跳转到用户登录页面
			dispatcher = request.getRequestDispatcher( "logon.jsp" );
		}
		
		dispatcher.forward( request, response );
	}
}