Advanced usage and expansion development guide for the CLJ Excel framework

The CLJ Excel framework is an Excel toolkit suitable for the Clojure language, which can easily operate and handle Excel files.This article will introduce the advanced usage of the CLJ Excel framework and how to expand the development. 1. Basic use of the CLJ Excel framework 1. Import the dependency library of CLJ Excel: clojure [clj-excel "0.5.0"] 2. Use CLJ Excel to read Excel file: clojure (ns my-app.core (:require [clj-excel.core :as excel])) (defn read-excel [filename] (let [workbook (excel/open-workbook filename) sheet (excel/get-sheet workbook 0) rows (excel/get-rows sheet)] (doseq [row rows] (let [cell-values (excel/get-cell-values row)] (println cell-values))))) The above code reads the excel file and printed the data of each row. 3. Use CLJ Excel to write to the Excel file: clojure (ns my-app.core (:require [clj-excel.core :as excel])) (defn write-excel [filename] (let [workbook (excel/create-workbook) sheet (excel/create-sheet workbook "Sheet 1") rows [["Name" "Age" "Country"] ["John" 25 "USA"] ["Alice" 28 "UK"] ["Bob" 30 "Canada"]]] (doseq [row rows] (let [excel-row (excel/create-row sheet) _ (doseq [value row] (let [cell (excel/create-cell excel-row)] (excel/set-cell-value cell value) (excel/add-cell excel-row cell)))) (excel/add-row sheet excel-row))) (excel/save-workbook workbook filename))) The above code will create a new Excel file and write some data. Second, the advanced usage of the CLJ Excel framework 1. Set the style of the cell: clojure (ns my-app.core (:require [clj-excel.core :as excel])) (defn apply-style [cell style] (excel/set-cell-style cell style)) (defn set-font-style [] (let [workbook (excel/create-workbook) sheet (excel/create-sheet workbook "Sheet 1") row (excel/create-row sheet) cell (excel/create-cell row) font (excel/create-font)] (excel/set-font-bold font true) (excel/set-cell-value cell "Bold text") (apply-style cell (excel/create-cell-style workbook font)) (excel/add-cell row cell) (excel/add-row sheet row) (excel/save-workbook workbook "output.xlsx"))) The above code demonstrates how to set the font style of a cell to the thick body. 2. Processing date data: clojure (ns my-app.core (:require [clj-excel.core :as excel])) (defn parse-date [cell] (let [date-value (excel/get-cell-date-value cell)] (if date-value (java.time.LocalDate/ofEpochDay (quot date-value 86400000))))) (defn process-dates [] (let [workbook (excel/open-workbook "input.xlsx") sheet (excel/get-sheet workbook 0) rows (excel/get-rows sheet)] (doseq [row rows] (let [date-cell (excel/get-cell row 0) date (parse-date date-cell)] (println date))))) The above code will process the date data in Excel and convert it to Java.Time.LocalDate objects in Clojure. Third, expansion and development of the CLJ Excel framework 1. Custom function: clojure (ns my-app.core (:require [clj-excel.core :as excel] [clj-excel.custom-functions :refer [register-function]])) (defn my-function [arg1 arg2] (str arg1 "-" arg2)) (defn register-custom-function [] (register-function :my-function my-function)) The above code demonstrates how to define and register a custom function.After registration, this function can be used in Excel. 2. Extend the other functions: The CLJ Excel framework provides many extensions, which can be developed according to demand.For example, extended Excel's chart function, data perspective table function, etc. The above is a brief introduction to the advanced usage of the CLJ Excel framework and the expansion development guide. I hope to help you understand and use the framework.If you want to know more about CLJ Excel, please refer to the official documentation.