cookie是隻要你再客戶端(瀏覽器)那的cookie開放而且有數據,每一次請求的時候都會自動添加到HTTP請求報文中。而後後臺能夠實時接收觀察獲取這些cookiehtml
1. 您還能夠爲 cookie 添加一個過時時間(以 UTC 或 GMT 時間)。默認狀況下,cookie 在瀏覽器關閉時刪除:java
2. jquery
jsajax
<body> <div> <input id="inVal" type="text" /><button id="btn">發送</button> </div> <script src="../js/lib/jquery-3.2.1.js"></script> <script> $('#btn').click(function () { checkCookie(); }); function setCookie(cname,cvalue,exdays){ var d = new Date(); d.setTime(d.getTime()+(exdays*24*60*60*1000)); var expires = "expires="+d.toGMTString(); document.cookie = cname+"="+cvalue+"; "+expires; } function getCookie(cname){ var name = cname + "="; var ca = document.cookie.split(';'); for(var i=0; i<ca.length; i++) { var c = ca[i].trim(); if (c.indexOf(name)==0) { return c.substring(name.length,c.length); } } return ""; } function checkCookie(){ var user=getCookie("username"); if (user!=""){ alert("歡迎 " + user + " 再次訪問"); $.ajax({ url: "postTest.do?", type: "POST", dataType: "text", contentType:"application/text;charset=UTF-8", data: {"key1":"val1","key2":"val2"}, success: function(data) { alert(data); }, error: function() { alert("請求出錯!"); } }); } else { user = prompt("請輸入你的名字:",""); if (user!="" && user!=null){ setCookie("username",user,30); } } } </script> </body>
java瀏覽器
@RequestMapping(value="postTest.do",method= RequestMethod.POST,produces = "application/text;charset=UTF-8;") @ResponseBody public String postTest(HttpServletRequest request) throws IOException { Cookie[] cookies = request.getCookies(); System.out.println("cookies[0].getName() = :"+cookies[0].getName()); System.out.println("cookies[0].getValue() = :"+cookies[0].getValue()); return "來自後臺的數據!"; }