java_web用户的自动登录模块的实现 - JAVA

OException; 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; public class EncodingFilter implements Filter { private FilterConfig filterConfig; @Override public void destroy() { // TODO Auto-generated method stub } @Override public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException { HttpServletRequest request = (HttpServletRequest) req; HttpServletResponse response = (HttpServletResponse) res; // 编码的设置 request.setCharacterEncoding(filterConfig.getInitParameter("encoding")); chain.doFilter(request, response); } @Override public void init(FilterConfig filterConfig) throws ServletException { // TODO Auto-generated method stub this.filterConfig=filterConfig; } }

自动登录的过滤类,用来控制用户的自动的登录操作的相关

package filter;

import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

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.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import bean.Admin;

import service.AdminService;
import serviceImpl.AdminServiceImpl;
import sun.misc.BASE64Encoder;

public class AutoLoginFilter implements Filter {

    @Override
    public void destroy() {
        // TODO Auto-generated method stub
    }

    @Override
    public void doFilter(ServletRequest req, ServletResponse res,
            FilterChain chain) throws IOException, ServletException {
        // 强制造型为子类型
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) res;
        // 1.首先判断session
        Object object = request.getSession().getAttribute("admin");

        if (object != null) {
            request.getRequestDispatcher("./sc.jsp").forward(request, response);
            return;
        }

        // 2.判断cookie中是否存在用户的记录
        Cookie autoCookie = null;
        // 获取所有的cookie进行遍历判断
        Cookie cookies[] = request.getCookies();
        if (cookies != null) {
            for (Cookie cookie : cookies) {
                // 判断是否已经存贮用户记录
                if ("autoLogin".equals(cookie.getName())) {
                    autoCookie = cookie;
                }
            }

            // 判断是否存在用户自动登录记录
            if (autoCookie == null) {
                chain.doFilter(request, response);
                return;
            }

            // 3.判断cookie的值
            // 获取cookie值
            String value = autoCookie.getValue();
            // 拆分
            String temps[] = value.split(":");

            // 判断长度是否是自定义的长度
            if (temps.length != 3) {
                chain.doFilter(request, response);
                return;
            }
            // 获取拆分后的数据
            String name = temps[0];
            
            String time = temps[1];
            
            String service_md5Value = temps[2];

            // 4.根据时间判断是否失效
            if (Long.valueOf(time) <= System.currentTimeMillis()) {
                chain.doFilter(request, response);
                return;
            }

            // 5.根据用户名查询数据
            AdminService adminService = new AdminServiceImpl();
            // 向




数据库发送数据请求
            Admin entity = adminService.checkLogin(name);
            if (entity == null) {
                chain.doFilter(request, response);
                return;
            }

            // 6.拼接字符串在进行二次判断,
            String md5Temp = entity.getPass() + ":" + entity.getName() + ":"
                    + time + "donghongyujava";
            if (!(md5Value(md5Temp).equals(service_md5Value))) {
                chain.doFilter(request, response);
                return;
            }

            // 7.如果以上的判断都通过,那么就发送成功的转跳连接
            request.getSession().setAttribute("admin", entity);
            request.getRequestDispatcher("./sc.jsp").forward(request, response);
        } else {
            chain.doFilter(request, response);
            return;
        }
    }

    @Override
    public void init(FilterConfig arg0) throws ServletException {
        // TODO Auto-generated method stub

    }

    // 加密的操作函数
    public String md5Value(String value) {
        try {
            // 获取md5加密的对象
            MessageDigest digest = MessageDigest.getInstance("md5");
            // 将传入的数据装换为byte字节,在用digest进行转换(加密)成新的字节数组,
            byte result[] = digest.digest(value.getBytes());
            BASE64Encoder encoder = new BASE64Encoder();
            // 返回加密后的数据
            return encoder.encode(result);

        } catch (NoSuchAlgorithmException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return "";
    };

}

web的配置,主要配置的是servlet和filter的配置

  

  
    
   
    jqueryeasyui
   
    
    
    
     AdminServlet
     
    
     servlet.AdminServlet
     
   

    
    
    
     AdminServlet
     
    
     /AdminOPer.do
     
   


    
    
    
     AutoLoginFilter
     
    
     filter.AutoLoginFilter
     
   

    
    
    
     AutoLoginFilter
     
    
     /AdminOPer.do
     
   


    
    
    
     EncodingFilter
     
    
     filter.EncodingFilter
     
     
     
     
      encoding
      
     
      UTF-8
      
     
   

    
   
    
    
    
     EncodingFilter
     
    
     /*
     
   

    
    
    
     index.html

java_web用户的自动登录模块的实现(四)