嗨我已登記表格設計中的自舉,其中i有使用遠程驗證器驗證所有形式的Fileds和我有具有它檢查所有行checkusername布爾方法registerdao.java方法如果用戶名存在,它會返回用戶名字符串,否則返回false,我在registartiion servlet中有checkusernameexists方法,它會在輸入用戶名字段時檢查用戶名。我不明白爲什麼我的代碼沒有顯示任何內容。下面是代碼不檢查用戶名和數據庫並通知。如何編寫JavaScript,以便它檢查數據的用戶名或給我一些想法如何使此代碼工作?任何幫助將不勝感謝appreaciated即時用戶名檢查用java豆和jQuery遠程驗證
ReegisterDao.java 公共靜態布爾checkUserName(用戶名字符串)拋出的SQLException { 字符串checkUserNameQuery 「+使用者名稱+ 」 '=' 從EmployeeDetails其中用戶名=選擇*「」?;
try{
// preparing some objects for connection
currentCon = ConnectionManager.getConnection();
Statement stmt = currentCon.createStatement();
rs = stmt.executeQuery(checkUserNameQuery);
boolean more = rs.next();
// if user does not exist set the isValid variable to false
return more;
}
catch (InstantiationException | IllegalAccessException e){}
return false; }
RegistrationServlet.java
public int checkUserNameExists(RegistrationBean user) throws SQLException{
int a=RegistrationDao.Register(user);
return a;
}
這是遠程驗證的一部分,該驗證用戶名
username: {
validators: {
notEmpty: {
message: 'The username is required'
},
stringLength: {
min: 6,
max: 30,
message: 'The username must be more than 6 and less than 30 characters long'
},
regexp: {
regexp: /^[a-zA-Z0-9_\.]+$/,
message: 'The username can only consist of alphabetical, number, dot and underscore'
},
remote:{
message:'This Username is already taken',
url:'https://localhost:8080/RegistrationServlet.java',
data:'username'
},
type:'POST'
}
},
,這是自舉的用戶名字段
<div class="form-group">
<label class="col-xs-2 control-label">Username</label>
<div class="col-xs-4">
<input type="text" class="form-control" name="username" placeholder="Username" />
</div></div>