阅读下面这首古诗，按要求答题。
                                                                                                             春 兴
                                                                                                             武元衡
                                                                                           杨柳阴阴细雨晴，残花落尽见流莺。
                                                                                           春风一夜吹乡梦，又逐春风到落成。
     【主】①武元衡：字伯苍，河南缑氏（今河南偃师缑氏镇）人。建中进士，官至剑南西川节度使，元和八年任宰相。元和十年被刺身死。②洛城：诗人的家乡在洛阳附近的缑氏县。