本文實例為大家分享了java異步登錄的具體代碼，供大家參考，具體內容如下
1.loginservletajax.java
包com.scce.servlet;導入java.io.ioexception;導入java.io.printwriter;導入javax.servlet.servletexception; import javax.servlet.http.httpservlet; import javax.servlet.http.httppservletrequest; import javax.servlet.servlet.http.http.httppservletserponseponse;導入net.sf.json.jsonobject;導入com.scce.dao.adminuserdao; import com.scce.pojo.adminuser;公共類LoginServleTajax擴展了HttpServlet {@Override Protected void Service（httpservletrequest請求，httpservletResponse響應）拋出ServletException，ioException，ioexception {// todo auto auto auto auto-generated方法uppect.setCharicter.setCharacterEncterEncterEncterEncterEncodecodecodectecter.setCharacterEncoding（utf-8”）; utf-8“）; wendment.setContentType（“ text/html; charset = utf-8”）;字符串方法= request.getMethod（）; if（method.equals（“ post”））{dologinajax（請求，響應）; } else if（method.equals（“ get”））{}} public void dologinajax（httpservletrequest request，httpservletResponse響應）拋出ServletException，ioexception {printWriter out = wither = repssht = wendspt.getWriter（getWriter.getWriter（）; //用戶名字符串用戶名= request.getParameter（“用戶名”）; //密碼字符串密碼= request.getParameter（“密碼”）;字符串msg =“”; Adminuserdao Adminuserdao = new Adminuserdao（）; Adminuser Adminuser = AdminuserDao.Queryuser（用戶名，密碼）;如果（adminuser！ = null）{msg =“ 登錄成功！”;字符串jsonobj = jsonobject.fromobject（adminuser）.toString（）; out.print（“ {/” msg/“：/”“+msg+”/“，/”，“ rows/”：“+jsonobj+”}”）; system.out.println（“ {/” msg/“：/”“+msg+”/“，/” rows/“：”+jsonobj+“}”）; } else {msg =“ 用戶名或者密碼不正確！ ”; out.print（“ {/” msg/“：/”“+msg+”/“}”）; } out.flush（）; out.close（）; }}} 2. -test2.html
<！ doctype html> <html> <head> <title> <title>第3章</title> <meta http-equiv =“鍵words” content =“鍵word1，鍵word1，鍵word2，鍵word3”> <meta http-equiv =“ charset = utf-8“> <link rel =”樣式表“ href =” ../ ui/themes/icon.css“ type =“ text/css”> </link> <link rel =“ stylesheet” href =“ ../ src =“ ../ js/jquery-1.8.2.2.min.js”> </script> - > <script type =“ text/javascript” src =“ ../ ui/jquery.min.js”> </script type =“ text/javascript” src =“ ../ ui/locale/easyui-lang-zh_cn.js”> </script> <script> <script type =“ text/javascript”> //字符串數字boolean null對象undefined undefine $（function（function（function（）按鈕：[{text：'登錄'，iconcls：'icon-add'，handler：function（）{console.info（“ 用戶登錄！”）; ajaxfrm（）; // ajax提交表單的函數}}]}）; }）; function ajaxFrm() { //------------------------註釋的是ajax提交方法---------------------------- var LoginList = $("#LoginList"); $ .ajax（{url：'../ loginservletajax？ = {“ msg”：“登錄成功”，“行”：{“ username”：“ admin”，...}} console.info（data）; //調試代碼$ .messager.alert（“提示”，data.msg） data.rows.username +“ - 密碼：” + data.rows.password +“ <br/>”; loginlist.html（stra）}}} /*var loginlist = $（“＃loginList”）; $（“＃form1”）。 form（“提交”，{url：“ ../ loginservletajax？tag = test”，onsubmit：function（param）{// param.name =“ liuqin”; param.age = 27; var username = username = $ = $（ ||。 $ .Messager.Alert（“提示”，data.msg）; });*/ }</script> </head> <body> <div id="LoginAdd"> <form id="form1" method="post"> <table> <tr> <td> 用戶名： </td> <td> <input id="username" name="username" > </td> </tr> <tr> <td> 密碼： </td> <td> <input id="password" name="password" type="password"> </td> </tr> </table> </form> </div> <div id="LoginList"> 用戶信息加載中...... </div> <video controls="controls" src="../video/B4934A0C53FC55703BFE3F6843E66166.mp4" type =“視頻/MP4”>您的瀏覽器不支持視頻標籤。 </video> </body> </html>以上就是本文的全部內容，Java程序設計有所幫助。