What is the current before arriving a resistor and after leaving it in the wire?
Yes, the current in a wire leading up to a resistor will be the same as the current in the wire leaving the resistor (in the ideal case). 

There are always real world factors that change ideal behavior however. There could be a small leakage current from the wires at near where they join the resistor or leakage from the resistor body itself to a surrounding part of the circuit. Leakage currents like this are normally exceedingly small and are thus usually ignored for most low voltage applications. They can however become much more significant in high voltage circuits.