The 49ers may have missed their wide-receiver target in the first round Thursday, but they landed one in a trade today. ESPN is reporting that the 49ers acquired San Francisco native Stevie Johnson in a trade with the Bills. Johnson, who played at Cal, had 52 catches for 597 yards and three touchdowns in 12 games last season in Buffalo. He had more than 1,000 receiving yards in each of the three previous seasons. Johnson, 27, became expendable when the Bills drafted Mike Evans in the first round Thursday.