cookie 自动登录

login.jsp

   <form   action="index.jsp"  method="post">
	  <p>
	          用户名：<input  type="text"  name="username" />
	          密码：<input type="password"  name="pwd"  />
	    <input  type="submit"  value=" 登陆">
	    <input  type=button  value=" 注册">  </p> 

	  </form>

index.jsp

 <%
         String name=request.getParameter("username");
         if(name!=null&&! name.trim().equals("")){
        	 Cookie cookie=new  Cookie("name","username");
        	 cookie.setMaxAge(60);
        	 response.addCookie(cookie);
         }else{
        	 Cookie []  cookies=request.getCookies();
        	 for(int i=0;i<cookies.length;i++ )
        	 {
        		 String cookiname=cookies[i].getName();
        		 if("name".equals(cookiname))
        		 {
        			 String val=cookies[i].getValue();
        			 name=val;
        		 }
	 }
         }

     if(name!=null&&! name.trim().equals(""))
     {
    	 out.print("hello:"+name);

     }
     else {
    	 response.sendRedirect("login.jsp");
     }
     %>

　　运行结果：