jsp使用filter登录状态验证

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>









	
		账户名:
	
	
		密码:
	
	登录
	
	<%@ include file="c.jsp" %>

package com.jmh.servlet;

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

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

import com.jmh.dao.Tb_LogonDao;
import com.jmh.entity.Tb_Logon;


public class LogonServlet extends HttpServlet{
	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
	this.doGet(req, resp);
	}
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
	//设置编码

	//获取out、session对象
		PrintWriter out = resp.getWriter();
		HttpSession session = req.getSession();
	//处理业务逻辑代码
		//获取传入过来的值
		String oname = req.getParameter("oname");
		String opwd = req.getParameter("opwd");
		//实例化实体类
		Tb_Logon lo=new Tb_Logon(oname, opwd);
		//实例化方法类
		Tb_LogonDao tbl=new Tb_LogonDao();
		try {
			boolean logon = tbl.Logon(lo);
			if(logon) {//登录成功
				//使用session
				//登录状态:登录成功后把用户名传入给session作用域
				session.setAttribute("oname", oname);
				req.getRequestDispatcher("跳转登录成功后的页面").forward(req, resp);
			}else {//登录失败
				out.print("");
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}

}

哈哈哈上编使用session和cookie做登录状态判断小辉没有配置哈哈 希望大家都能自己配置哦

  jsp-04
  
    index.html
    index.htm
    index.jsp
    default.html
    default.htm
    default.jsp
  
  
  
  	建议填写该配置的类名
  	筛选完整路径(包名+类名)
  
  
  	建议填写该配置的类名
  	/建议填写该配置的类名.do(=可以通过类名+.do来访问页面)
  

 小编也同时利用了filter筛选做了编码设置

package com.jmh.filter;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;


public class SetEcodingLogon implements Filter{

	@Override
	public void destroy() {
		//筛选被摧毁
	}

	@Override
	public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
			throws IOException, ServletException {
		//筛选器被执行/处理
		//设置编码
		HttpServletRequest req=(HttpServletRequest)arg0;
		HttpServletResponse resp=(HttpServletResponse)arg1;
		req.setCharacterEncoding("utf-8");
		resp.setContentType("text/html;charset=utf-8");
		//获取out对象
		PrintWriter out = resp.getWriter();
		//获取session对象
		HttpSession session = req.getSession();
		//获取请求地址
		String uri = req.getRequestURI();
		if(uri.indexOf("logon.jsp")>-1||uri.indexOf("logonServlet.do")>-1) {
			//如果是登录页面或者登录servlet就放行
			arg2.doFilter(arg0, arg1);
			return;
		}
		//获取session里面的值
		String s = (String)session.getAttribute("oname");
		//如果跳转指定页面判断session里面没有值的话就跳转登录界面
		if(null == s) {
			//使用js方式跳转页面登录页面
			out.print("");
		}
		//放行
		arg2.doFilter(arg0, arg1);
	}

	@Override
	public void init(FilterConfig arg0) throws ServletException {
		//筛选被创建
	}

}

  jsp-04
  
    index.html
    index.htm
    index.jsp
    default.html
    default.htm
    default.jsp
  
  
  
  	建议填写该配置的类名
  	筛选完整路径(包名+类名)
  
  
  	建议填写该配置的类名
  	/*(/*=输入什么都可以执行筛选)