java异步方式实现登录
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
packagecom.scce.servlet;
importjava.io.IOException;
importjava.io.PrintWriter;
importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importnet.sf.json.JSONObject;
importcom.scce.dao.AdminUserDao;
importcom.scce.pojo.AdminUser;
publicclassLoginServletAjaxextendsHttpServlet{
@Override
protectedvoidservice(HttpServletRequestrequest,
HttpServletResponseresponse)throwsServletException,IOException{
//TODOAuto-generatedmethodstub
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
Stringmethod=request.getMethod();
if(method.equals("POST")){
doLoginAjax(request,response);
}elseif(method.equals("GET")){
}
}
publicvoiddoLoginAjax(HttpServletRequestrequest,
HttpServletResponseresponse)throwsServletException,IOException{
PrintWriterout=response.getWriter();
//用户名
Stringusername=request.getParameter("username");
//密码
Stringpassword=request.getParameter("password");
Stringmsg="";
AdminUserDaoadminUserDao=newAdminUserDao();
AdminUseradminUser=adminUserDao.queryUser(username,password);
if(adminUser!=null){
msg="登录成功！";
StringjsonObj=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
<!DOCTYPEhtml>
<html>
<head>
<title>chapter3-test2</title>
<metahttp-equiv="keywords"content="keyword1,keyword2,keyword3">
<metahttp-equiv="description"content="thisismypage">
<metahttp-equiv="content-type"content="text/html;charset=UTF-8">
<linkrel="stylesheet"href="../UI/themes/icon.css"type="text/css"></link>
<linkrel="stylesheet"href="../UI/themes/default/easyui.css"
type="text/css"></link>
<!--<scripttype="text/javascript"src="../js/jquery-1.8.2.min.js"></script>-->
<scripttype="text/javascript"src="../UI/jquery.min.js"></script>
<scripttype="text/javascript"src="../UI/jquery.easyui.min.js"></script>
<scripttype="text/javascript"src="../UI/locale/easyui-lang-zh_CN.js"></script>
<scripttype="text/javascript">
//stringnumberbooleannullobjectundefinedfunction
$(function(){
$("#LoginAdd").dialog({
title:"用户登录",
collapsible:'true',
width:300,
height:200,
buttons:[{
text:'登录',
iconCls:'icon-add',
handler:function(){
console.info("用户登录！");
ajaxFrm();//ajax提交表单的函数
}
}]
});
});
functionajaxFrm(){
//------------------------注释的是ajax提交方法----------------------------
varLoginList=$("#LoginList");
$.ajax({
url:'../LoginServletAjax?tag=test',//相对路径访问
type:'POST',//提交请求的方式
data:$('#form1').serialize()+'&names=liuqin&age=26',//将表单参数序列化，发送到服务器的数据(提交额外的参数)
dataType:'json',//预期服务器返回的数据类型-jsonobject
success:function(data){//请求成功后将调用此方法vardata={"Msg":"登录成功","rows":{"username":"admin",...}}
console.info(data);//调试代码
$.messager.alert("提示",data.Msg);
LoginList.html("");//清空数据
if(data.rows){
varstra=LoginList.html()+"用户名:"+data.rows.username
+"--密码："+data.rows.password+"<br/>";
LoginList.html(stra);
}
},
error:function(error){//请求失败时将调用此方法
console.info(error);
}
});
/*varLoginList=$("#LoginList");
$("#form1").form("submit",{
url:"../LoginServletAjax?tag=test",
onSubmit:function(param){//提交额外的参数
param.name="liuqin";
param.age=27;
varusername=$("#username").val();
varpassword=$("#password").val();
if(username.length==0||password.length==0){
$.messager.alert('警告','请输入用户名和密码');
returnfalse;
}
returntrue;
},
success:function(data){
//vardata=eval('('+data+')');
vardata=$.parseJSON(data);//服务器端返回json字符串转成json对象-jsobject
console.info(data);
$.messager.alert("提示",data.Msg);
LoginList.html("");//清空数据
if(data.rows){
varstra=LoginList.html()+"用户名:"+data.rows.username
+"--密码："+data.rows.password+"<br/>";
LoginList.html(stra);
}
}
});*/
}
</script>
</head>
<body>
<divid="LoginAdd">
<formid="form1"method="post">
<tablestyle="width:100%;">
<tr>
<td>
用户名：
</td>
<td>
<inputid="username"name="username"
class="easyui-validateboxtextbox">
</td>
</tr>
<tr>
<td>
密码：
</td>
<td>
<inputid="password"name="password"
class="easyui-validateboxtextbox"type="password">
</td>
</tr>
</table>
</form>
</div>
<divid="LoginList">
用户信息加载中......
</div>
<videowidth="320"height="240"controls="controls"
src="../video/B4934A0C53FC55703BFE3F6843E66166.mp4"type="video/mp4">
Yourbrowserdoesnotsupportthevideotag.
</video>
</body>
</html>
以上就是本文的全部内容，希望对大家学习java程序设计有所帮助。