index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%    String path = request.getContextPath();    String basePath = request.getScheme() + "://"            + request.getServerName() + ":" + request.getServerPort()            + path + "/";%><%@page import="java.net.*" %><%@page import="comm.MakeMD5" %>
         <%        boolean loginFlag=false;        String account=null;        String md5Account=null;        Cookie cookieArr[]=request.getCookies();        if(cookieArr!=null&&cookieArr.length>0){            for(Cookie cookie:cookieArr){                if(cookie.getName().equals("account")){                    account=cookie.getValue();                    account=URLDecoder.decode(account,"utf-8");                    //System.out.print(account);                }                if(cookie.getName().equals("md5Account")){                    md5Account=cookie.getValue();                    md5Account=URLDecoder.decode(md5Account,"utf-8");                    //System.out.print(md5Account);                }            }        }                if(account!=null&&md5Account!=null){            loginFlag=md5Account.equals(MakeMD5.getMD5(account));        }                if(loginFlag){            //request.getRequestDispatcher("successlogin.jsp").forward(request, response);            //response.sendRedirect("successlogin.jsp");    %>        
     
            
      
欢迎您回来
            
      
                       
        
                             
<%=account %>，欢迎您登陆本网站
                             
                        注销登陆                    
                        
                   
      
        
     
    <%        }else{    %>        
     
            
      
用户登录
            
      
                
       
                            
         
                                  
账  号:
                                  
                             
                             
                                  
密  码:
                                  
                             
                             
                                  
有效期:
                                  
  关闭浏览器即失效  30天内有效  永久有效 
                             
                             
                                  
    
                             
                        
       
            
      
        
     
    <%        }     %>

 

src/comm/foreverlogin.java

package comm;import java.io.IOException;import java.net.URLEncoder;import javax.servlet.ServletException;import javax.servlet.http.Cookie;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class foreverlogin extends HttpServlet {    private static final long serialVersionUID = 1L;        public foreverlogin() {        super();    }    public void destroy() {        super.destroy(); // Just puts "destroy" string in log        // Put your code here    }    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        doPost(request,response);    }        public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        request.setCharacterEncoding("utf-8");        response.setContentType("text/html;charset=utf-8");                String action=request.getParameter("action");        if(action.equals("login")){            login(request,response);        }        else if(action.equals("logout")){            logout(request,response);        }    }        //login    public void login(HttpServletRequest request, HttpServletResponse response) throws ServletException,IOException{        String account=request.getParameter("account");        //String password=request.getParameter("password");        int timeout=Integer.parseInt(request.getParameter("timeout"));                String md5Account=MakeMD5.getMD5(account);  //采用MD5算法加密        account=URLEncoder.encode(account,"utf-8"); //账号为中文时需要转换Unicode才能保存在Cookie中        Cookie accountCookie=new Cookie("account",account);        accountCookie.setMaxAge(timeout);        Cookie md5AccountCookie=new Cookie("md5Account",md5Account);        md5AccountCookie.setMaxAge(timeout);        response.addCookie(accountCookie);        response.addCookie(md5AccountCookie);                //将线程休眠1秒后在执行        try {            Thread.sleep(1000);        } catch (InterruptedException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }                //response.sendRedirect("cookie/resultlogin.jsp?"+System.currentTimeMillis());        response.sendRedirect("cookie/index.jsp?"+System.currentTimeMillis());    }        //logout    public void logout(HttpServletRequest request, HttpServletResponse response) throws ServletException,IOException{        Cookie accountCookie=new Cookie("account","");        accountCookie.setMaxAge(0);        Cookie md5AccountCookie=new Cookie("md5Account","");        md5AccountCookie.setMaxAge(0);        response.addCookie(accountCookie);        response.addCookie(md5AccountCookie);                //将线程休眠一秒后在执行        try {            Thread.sleep(1000);        } catch (InterruptedException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }                response.sendRedirect("cookie/index.jsp?"+System.currentTimeMillis());    }        public void init() throws ServletException {        // Put your code here    }}

 

src/comm/MakeMD5.java

package comm;import java.security.MessageDigest;public class MakeMD5 {    public final static String getMD5(String str){        // 用来将字节转换成 16 进制表示的字符        char hexDiagiArr[]={'0','1','2','3','4','5','6','7','8','9','0','a','b','c','d','e','f'};        MessageDigest digest=null;        try{            digest=MessageDigest.getInstance("MD5");     //创建MD5算法摘要            digest.update(str.getBytes());                 //更新摘要            byte mdBytes[]=digest.digest();                 //加密，并返回字节数组            //新建字符数组，长度为myBytes字节数组的2倍，用于保存加密后的值            char newCArr[]=new char[mdBytes.length*2];            int k=0;            for(int i=0;i
     
      >>4&0x0f]; //取字节中高 4 位的数字转换,>>>为逻辑右移，将符号位一起右移                newCArr[k++]=hexDiagiArr[byte0&0x0f];     //取字节中低 4 位的数字转换                //针对字符0-9的，0-9的ascii码值为0x30，0x31，0x32 0x33 ...0x39，                //因此与0x0f按位与后只保留个位上的书即0x0，0x1，。。。0x9                //  0000 1010                //& 0000 1111                //  0000 1010            }            return String.valueOf(newCArr);   //将转换后的字符转换为字符串        }        catch(Exception e){            e.printStackTrace();        }        return null;    }}