The import javax.servlet.http.HttpServletRequest cannot be resolved問題與解決

The import javax.servlet.http.HttpServletRequest cannot be resolved問題 The import javax.servlet.http.HttpServletRequest cannot be resolved即 HttpServletRequest不能解析爲類型，這個錯誤可能是servlet庫沒有導入。 解決 右擊項目找到Bulid

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