本文实例为大家分享了java异步登录的具体代码，供大家参考，具体内容如下
1.loginservletajax.java
包com.scce.servlet;导入java.io.ioexception;导入java.io.printwriter;导入javax.servlet.servletexception; import javax.servlet.http.httpservlet; import javax.servlet.http.httppservletrequest; import javax.servlet.servlet.http.http.httppservletserponseponse;导入net.sf.json.jsonobject;导入com.scce.dao.adminuserdao; import com.scce.pojo.adminuser;公共类LoginServleTajax扩展了HttpServlet {@Override Protected void Service（httpservletrequest请求，httpservletResponse响应）抛出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（请求，响应）; } else if（method.equals（“ get”））{}} public void dologinajax（httpservletrequest request，httpservletResponse响应）抛出ServletException，ioexception {printWriter out = wither = repssht = wendspt.getWriter（getWriter.getWriter（）; //用户名字符串用户名= request.getParameter（“用户名”）; //密码字符串密码= request.getParameter（“密码”）;字符串msg =“”; Adminuserdao Adminuserdao = new Adminuserdao（）; Adminuser Adminuser = AdminuserDao.Queryuser（用户名，密码）;如果（adminuser！= null）{msg =“ 登录成功！”;字符串jsonobj = jsonobject.fromobject（adminuser）.toString（）; out.print（“ {/” msg/“：/”“+msg+”/“，/”，“ rows/”：“+jsonobj+”}”）; system.out.println（“ {/” msg/“：/”“+msg+”/“，/” rows/“：”+jsonobj+“}”）; } else {msg =“ 用户名或者密码不正确！”; out.print（“ {/” msg/“：/”“+msg+”/“}”）; } out.flush（）; out.close（）; }}} 2. -test2.html
<！doctype html> <html> <head> <title> <title>第3章</title> <meta http-equiv =“键words” content =“键word1，键word1，键word2，键word3”> <meta http-equiv =“ charset = utf-8“> <link rel =”样式表“ 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”> //字符串数字boolean null对象undefined undefine $（function（function（function（）按钮：[{text：'登录'，iconcls：'icon-add'，handler：function（）{console.info（“ 用户登录！”）; ajaxfrm（）; // ajax提交表单的函数}}]}）; }）; function ajaxFrm() { //------------------------注释的是ajax提交方法---------------------------- var LoginList = $("#LoginList"); $ .ajax（{url：'../ loginservletajax？ = {“ msg”：“登录成功”，“行”：{“ username”：“ admin”，...}} console.info（data）; //调试代码$ .messager.alert（“提示”，data.msg） data.rows.username +“ - 密码：” + 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> 用户名： </td> <td> <input id="username" name="username" > </td> </tr> <tr> <td> 密码： </td> <td> <input id="password" name="password" type="password"> </td> </tr> </table> </form> </div> <div id="LoginList"> 用户信息加载中...... </div> <video controls="controls" src="../video/B4934A0C53FC55703BFE3F6843E66166.mp4" type =“视频/MP4”>您的浏览器不支持视频标签。 </video> </body> </html>以上就是本文的全部内容，Java程序设计有所帮助。