The list of official apologies by the prime ministers and emperors of Japan.
List of war apology statements issued by Japan - Wikipedia, the free encyclopedia
Not just words. ODA to China by Japan totals to 6 trilion US dollars (６兆円).
政府開発援助 - Wikipedia
Admittedly, most of it is no or very low interest loans and not donation, but a lot of it is still not payed off and the loans started in the 70's so it was worth a lot more than it is today.