Your transfromer would be 220VAC to 15VAC (after Bridge rectifier, the output DC voltage will be multiplied by sqrt(2))
Then, you can use LM317 to regulate your output DC Voltage. If you need more current (2A), you can add a power transistor, such as 2N3055 or 2N2955 (check in datasheet to get N-type or P-type).
For specific circuit diagram, download LM317 datasheet, it is accompanied with some useful circuit diagram!
For filter, use 2.200 uF for 1A (so 2A is 4.400 uf)