String userName=request.getParameter("userName");什么意思

lblhtyhm.Visible = true; this.lblhtyhm.Text = Session[UserName].ToString(); string ContId = Requ求解释一下 String userName=request.getParameter(userName);什么意思 关于Trim（）string UserName = txtUserName.Text;和string UserName = txtUserName.Text.Trim();它们之间的却别是什么?我分不清这两种的用法 jsp Cannot forward after response has been committed问题,String username = request.getParameter(username);String password = request.getParameter(password);String confirmPassword = request.getParameter(confirmPassword);String sql = select use S_USERNAME=:USERNAME AND S_PASSWORD=:PASSWORD;OracleParameter[] parms = { new OracleParameter(USERNAME,OracleType.VarChar),new OracleParameter(PASSWORD,OracleType.VarChar),};parms[0].Value = userName;parms[1].Value = password;string sql = SELEC protected void Button1_Click(object sender,EventArgs e) { string username,pwd,sqlstr; username = txtName.Text.Trim(); pwd = txtpwd.Text.Trim(); if (username.Length > 0 && pwd.Length > 0) { 请问每句代码的意思是什么?public SqlDataReader GetmySend(string username){SqlConnection myConnection = new SqlConnection(ConfigurationManager.AppSettings[MySQLConn]);string cmdText = SELECT * FROM send where name='+username+' ORDER BY C#语法的问题 get set的用法public class Users { private int _userid; private string _username; private string _userpwd; public int UserId { get { return this._userid; } set { this._userid = value; } } public string UserName { get { return this C#语法问题 this的用法public class Users{private int _userid;private string _username;private string _userpwd;public int UserId{get { return this._userid; }set { this._userid = value; }}public string UserName{get { return this._username; }set { org.hibernate.exception.SQLGrammarException:could not execute query异常代码如下：public class IndexAction extends Action {..String hql = from UserInfo where username=' + username + ';Hibernate hn = new Hibernate();UserInfo info = (UserInf 新手提问,望大家解答帮忙看下这个string sqlstr = select usertype from Users where username='+ username.Text+'and mypassword=@password;里面的这个@password@符号是什么意思啊?谢谢～～～～～ username Spring security中j_spring_security_check,流程j_spring_security_check验证登录的表单信息中j_username,j_password被传走,但是我在org.springframework.security.ui.webapp的AuthenticationProcessingFilter.java看到String username = obtain 高手帮我看看这句话哪里有问题String sql =SELECT * FROM UserAccount WHERE uername =' + username + 'AND password=' + password + '; 就是做登陆界面时,检测username和password的,但是我不知道两个同时写中间是要 String s=new String(a);是什么意思 带有replace的这句话是什么意思,有什么意义address=request.form(address)address=replace(address,',)username=request.form(username)username=replace(username,',)username=replace(trim(request(username)),',)例如,下面的 Unknown column 'a' in 'field list'int i=1;String str=qinyue;String ss=insert into liuyansf(userid,username)values(+i+,+str+);为什么 i=1 就可以 顺利的显示在数据库中而str=“qinyue 就不行哦,就会出现Unknown column 'qiny string.