日期:2014-05-20  浏览次数:20726 次

关于数据库出错了....高手帮忙下
下面就是我的登陆对话框中当点击登陆时   触发的代码

为什么从数据库中取出来的密码是乱码啊?

public   void   checkfill()   {
String   lname   =   Lname.getText();
char   lpass[]   =   Lpass.getPassword();
if   (lname.length()   ==   0)   {
JOptionPane.showMessageDialog(this,   "请输入用户名 ");
}   else   if   (lpass.length   ==   0)   {
JOptionPane.showMessageDialog(this,   "请输入密码 ");

}   else   {
Logincon();
}
}

public   void   Logincon()   {
String   url   =   "jdbc:mysql://localhost:3306/lucky ";
sqlname   =   "root ";
sqlpass   =   "zhangyang ";
try   {
Class.forName( "com.mysql.jdbc.Driver ");
con   =   DriverManager.getConnection(url,   sqlname,   sqlpass);
//   System.out.println( "1   run   ing   now ");
}   catch   (ClassNotFoundException   e)   {
System.out.println( "装载驱动程序失败 ");
e.printStackTrace();
System.exit(1);
}   catch   (SQLException   e)   {
System.err.println( "无法连接数据库 ");
e.getMessage();

}

try   {
lname   =   Lname.getText();

String   checkname   =   "select   *   from   user   where   name= "   +   lname   +   " ";
/*
  *   String   strsql   =   "select   *   from   user   where   (name= ' "   +   lname   +   " '
  *   and   pass= ' "   +   lpass   +   " ') ";
  */
stmt   =   con.createStatement();
rs   =   stmt.executeQuery(checkname);
boolean   flag   =   rs.next();

if   (flag)   {
lpass   =   Lpass.getPassword();
String   checkpass   =   "select   *   from   user   where   name= "   +   lname
+   " ";
stmt   =   con.createStatement();
rs   =   stmt.executeQuery(checkpass);
rs.next();
char[]   repass   =   rs.getString(1).toCharArray();
                                System.out.println(repass.toString());
boolean   x=Arrays.equals(lpass,repass);
if   (x)   {

flags   =   1;

}   else   {
JOptionPane.showMessageDialog(this,   "密码错误 ");
Lpass.setText( " ");
}
}

else   {
JOptionPane.showMessageDialog(this,   "用户名不存在 ");
Lname.setText( " ");
Lpass.setText( " ");
return;
}
con.close();
rs.close();
stmt.close();
}   catch   (SQLException   e)   {
e.getStackTrace();
}

}


还有就是我在程序中注册用户后,存在数据库中也是乱码


表的结构如下
mysql>   desc   user;
+--------+-----------+------+-----+---------+-------+
|   Field     |   Type             |   Null   |   Key   |   Default   |   Extra   |