What era did the ancient literature Shangshu come from?

The ancient text "Shang Shu" has many sources. The most unique feature is that it comes from private collections in the wall of the Han Dynasty. According to legend, it was discovered by King Lu Gong when he was demolishing a section of the wall of Confucius' former residence. It was later compiled by Kong Anguo, a descendant of Confucius. The content of the ancient "Shang Shu" passed down to later generations also included parts of the ancient "Shang Shu", but it was a forgery.

1. To correctly treat the pseudo-"Ancient Classics", we must first have a correct attitude toward the pseudo-"Zhuan" of Confucius. "'s explanation is the earliest complete "Shangshu" annotation that can be seen at present. It is a high achievement in the study of "Shangshu". We only need to distinguish that it is the achievement of the Jin people rather than the achievements of the Han people, and we can fully understand it. Understand and utilize its value;

2. Secondly, we should also have a correct attitude towards the pseudo-"Guwenshangshu". In fact, the pseudo-"Guwenshangshu" brings together all the books from the pre-Qin "Zuo Zhuan" to Many of the contents of the original "Shang Shu" cited in the ancient books of the Wei and Jin Dynasties over the past 800 years have been combined, arranged, and perfunctory. In this sense, the 25 "pseudo-ancient texts" are also a way for modern people to get a glimpse of the 100-part "Shangshu" in the pre-Qin Dynasty.