Cookie cookie = new Cookie("LastAccessTime",System.currentTimeMillis()+"");cookie.setMaxAge(1*30*24*3600);//設置有效期1個月cookie.setPath("/項目名稱");//訪問整個項目都帶cookie

Cookie cookies[] = request.getCookies();for(int i = 0;cookie!=null&&i<cookies.length;i++){  if(cookies[i].getName().equals("LastAccessTime")){   long cookieValues = Long.parseLong(cookies[i].getVlues());//將String轉化為10進制Long型   Date date = new Date(cookieValues);   response.getWrite().print(date);  }}

HttpSession session = request.getSession();session.setAttribute("name","哈哈哈哈");

HttpSession session = request.getSession();//HttpSession session = request.getSession(false);//只獲取不創建String str = (String)session.getAttribute("name");

<seeeion-config>  <session-timeout>20</session-timeout>  </session-config>

HttpSession session = request.getSession();session.invalidate();//session.removeAttribute("XXX");//移除某個session

request.getSession();String url1 = response.encodingURL("需要重寫的地址1");String url2 = response.encodingURL("需要重寫的地址2");PrintWriter out = response.getWriter;out.print("<a href = '"+url1+"'>XXXX</a>");out.print("<a href = '"+url2+"'>YYYY</a>");

<form action="/項目/xxx" method ="post" onsubmit="return dosubmit(this)">  用戶名:<input type="text" name="username"><br/>  密碼:<input type="password" name = "password"><br/>  <input type="submit" value="提交"></form><script>  function dosubmit(obj){   if(obj.category.value==''){    alter("請輸入");    return false;   }    }</script>

<form action="/項目/xxx" method ="post" onsubmit="return dosubmit()">  用戶名:<input type="text" name="username"><br/>  密碼:<input type="password" name = "password"><br/>  <input type="submit" value="提交"></form><script>  function dosubmit(){   var iscommitted = false;   if(!iscommitted){    iscommitted = true;    return true;   }else{    return false;     }  }</script>