玩飛盤工程師的部落格

※怕自己忘記特別做個簡單的操作紀錄※

由於分析數據會用到很多excel的檔案，故使用POI這個開源碼來進行excel的讀取及資料的抓取。

POI我覺得目前主要分為四個部分

Workbook(Excel本體)、Sheet(內部頁面)、Row(頁面之行(橫的))、Cell(行內的元素)

POI的起始值也為0，故第一頁為0、第二頁為1...以此類推。

//利用FileInputStream讀取該路徑之檔案，".\\"為根目錄之意思
FileInputStream inp = new FileInputStream(".\\workbookwc.xlsx");

//利用wb承接FileInputStream所讀取的檔案
XSSFWorkbook wb = new XSSFWorkbook(inp);
XSSFSheet sheet = wb.getSheetAt(0);//讀取wb內的頁面
XSSFRow row = sheet.getRow(2);//讀取頁面0的第二行
XSSFCell cell = row.getCell(3);//讀取第二行的第三個元素
System.out.println(cell);//可直接透過println輸出cell

public static void scaneWholeFile(String file) throws FileNotFoundException, IOException {
        //1.Read Excel File into workbook
        FileInputStream inp = new FileInputStream(file);
        XSSFWorkbook wb = new XSSFWorkbook(inp);
        inp.close();

        //2.get wb sheet(0)
        XSSFSheet sheet = wb.getSheetAt(0);
        //get total num of row
        int rowLength = sheet.getLastRowNum();
        String sheetName = sheet.getSheetName();
        System.out.println(sheetName);
        //3.get wb row
        XSSFRow row = sheet.getRow(0);
        //total num of cols(cell)
        int cellLength = row.getLastCellNum();
        //4.get wb cols(cell
        XSSFCell cell = row.getCell(0);
        
        //this loop will scane all info at each cell
        for (int i = 0; i <= rowLength; i++) {
            //get each row  
            XSSFRow row1 = sheet.getRow(i);
            for (int j = 0; j < cellLength; j++) {
                //get each cols  
                XSSFCell cell1 = row1.getCell(j);
                
                
                System.out.print(cell1 + "                   ");
            }
            System.out.println();
            
        }
    }

refference: https://poi.apache.org/apidocs/org/apache/poi/xssf/usermodel/XSSFWorkbook.html