Why is Jian 'an literature a banner in the history of literature?

Why is Jian 'an literature a glorious era in the history of China literature? What is the positive significance of Jian 'an literature to the development of literature in Han Dynasty? Great changes have taken place in China literature during the Jian 'an period at the end of Han Dynasty, which indicates the arrival of a new period of literary development. During this period, a large number of writers emerged in the literary world, among which San Cao, Qi Zi and Cai Yan were the representatives. They are all involved in the extremely turbulent whirlpool of the times, and their lives and thoughts have undergone tremendous changes. After Han Yuefu, they broke the depression of literati poetry in Han Dynasty and set off the climax of literati poetry for the first time. They directly inherited the realistic spirit of folk songs in Han Yuefu, reflected the rich social life, showed the new spirit of the times, had a unique style of "generosity and sadness" and formed the fine tradition of "Jian 'an style". At the same time, they generally adopted the new five-character style, which laid a solid position in the literary world. During this period, Fu's prose also took on a new look. Cao Cao's poems are all Yuefu poems. Although they followed the ancient theme of Yuefu in the Han Dynasty, they did not follow the ancient meaning of ancient words, but inherited the spirit of Yuefu folk songs. "Writing poems with Yuefu theme" (the dialect of Qing Dynasty) reflected the new reality and showed a new look. Cao Pi's poems have two obvious characteristics: first, there are many works describing the love between men and women and the theme of wandering women, which are well written; On the other hand, there are various forms, including four words, five words, six words, seven words and miscellaneous words. Five-character poems and seven-character poems have achieved great success. Cao Zhi's life is bounded by Cao Pi's claim to be emperor, which is obviously divided into two periods. The representative work in the early stage was White Horse, which created an image of a patriotic brave with high martial arts, eager to make contributions to the country and even willing to die heroically, and was full of heroic optimism. Cao Zhi was persecuted and depressed in his later period, and his later poems mainly reflected this situation and mood. To Wang Biao, A White Horse is an important work of the poet in his later period. He wrote in Huang Chu for four years. Although this poem only expresses the poet's subjective feelings, it profoundly exposes the cruelty of internal rule and has profound ideological significance. The poems of the seven sons of Jian 'an and Cai Yan, a poetess, both show anxiety in troubled times and concern for reality. Jian 'an literature occupies an important position in the history of China literature. It is very rare for a period of literature to form a tradition and be accepted. When Zhong Rong opposed the poetic style of formalism after Jin Dynasty, he once lamented that "the wind of Jian 'an is exhausted"! Chen Ziang, a poet in the early Tang Dynasty, also held high the banner of "Han-Wei Character" in his poetry innovation, which shows that the tradition of "Jian 'an Character" has a far-reaching influence on later literature.