poi 工具類

最近公司有個項目用到了poi，須要按自定義導出模板進行數據導出，藉此瞭解了一下poi的相關操做

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author liyhu
 * @date 2019年09月28日
 */
public class ExcelUtil {
    public static Workbook createExcel5(Workbook workbook, String sheetName, List<List<String>> data, List<String> headers) {
        Sheet sheet = workbook.createSheet(sheetName);
        sheet.setDefaultRowHeight((short) (2 * 256));
        int size = headers.size();


        sheet.addMergedRegion(new CellRangeAddress(0,0,0,size-1));
        Row firstTitleRow = sheet.createRow(0);
        Cell firstTitleCell = firstTitleRow.createCell(0);
        firstTitleCell.setCellValue("員工");

        Font font = workbook.createFont();
        font.setBold(true);
        font.setFontName("宋體");


        Font redFont = workbook.createFont();
        redFont.setBold(true);
        redFont.setFontName("宋體");
        redFont.setColor(Font.COLOR_RED);

        CellStyle firstCellStyle = workbook.createCellStyle();
        firstCellStyle.setAlignment(HorizontalAlignment.CENTER);
        firstCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
        firstCellStyle.setFont(font);

        firstTitleCell.setCellStyle(firstCellStyle);

//        ---------------
        sheet.addMergedRegion(new CellRangeAddress(1,1,0,size-1));
        Row secondTitleRow = sheet.createRow(1);
        Cell secondTitleCell = secondTitleRow.createCell(0);
        secondTitleCell.setCellValue("導入人：");

        CellStyle secondCellStyle = workbook.createCellStyle();
        secondCellStyle.setAlignment(HorizontalAlignment.LEFT);
        secondCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
        secondCellStyle.setFont(font);

        secondTitleCell.setCellStyle(secondCellStyle);

//        ------

        Row titleRow = sheet.createRow(2);

        DataFormat dataFormat = workbook.createDataFormat();//建立格式化對象
        short text = dataFormat.getFormat("TEXT");

        CellStyle textStyle = workbook.createCellStyle();        //標題樣式
        textStyle.setDataFormat(text);

        CellStyle titleStyle = workbook.createCellStyle();        //標題樣式
        titleStyle.setAlignment(HorizontalAlignment.CENTER);
        titleStyle.setVerticalAlignment(VerticalAlignment.CENTER);

        font.setFontHeightInPoints((short) 14);
        titleStyle.setFont(font);
        titleStyle.setBorderBottom(BorderStyle.THIN);
        titleStyle.setBorderRight(BorderStyle.THIN);


        titleStyle.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());
        titleStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
        Map<Integer,Integer> colWidthMap=new HashMap<>();
        for (int i = 0; i < size; i++) {
            Cell cell = titleRow.createCell(i);
            cell.setCellStyle(titleStyle);
            RichTextString richTextString=new XSSFRichTextString(headers.get(i));
            richTextString.applyFont(font);
            if(richTextString.getString().startsWith("*")){
                richTextString.applyFont(0,1,redFont);
            }
            cell.setCellValue(richTextString);

            sheet.setDefaultColumnStyle(i,textStyle);

            colWidthMap.put(i, 14);
        }


        CellStyle dataStyle = workbook.createCellStyle();        //標題樣式
        dataStyle.setAlignment(HorizontalAlignment.CENTER);
        dataStyle.setVerticalAlignment(VerticalAlignment.CENTER);
        dataStyle.setDataFormat(text);
        dataStyle.setFillBackgroundColor(IndexedColors.RED.getIndex());;//設置單元格背景色爲騷粉



        for (int i = 0; i < data.size(); i++) {
            List<String> oneRow = data.get(i);
            Row row = sheet.createRow(i + 3);
            for (int j = 0; j < oneRow.size(); j++) {
                Cell cell = row.createCell(j);
                cell.setCellValue(oneRow.get(j));
                cell.setCellStyle(dataStyle);
                int length = oneRow.get(j).length();
                Integer defaultColWidth = colWidthMap.get(j);
                if(length > defaultColWidth ){
                    colWidthMap.put(j,length);
                }
            }
        }

        for (Map.Entry<Integer, Integer> entry : colWidthMap.entrySet()) {
            sheet.setColumnWidth(entry.getKey(),entry.getValue() * 256);
        }
        return workbook;
    }

}

 client 端

import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**
 * @author liyhu
 * @date 2019年09月28日
 */
public class PoiClient {
    public static void main(String[] args) {
        Workbook workbook=new XSSFWorkbook();
        String sheetName="one";
        List<List<String>> data=new ArrayList<>();
        for (int i = 0; i < 9; i++) {
            data.add(Arrays.asList("name"+i,"ageemail45454545email45454545email45454545email45454545"+i,"email45454545email45454545email45454545email45454545"+i));
        }
        data.add(Arrays.asList("name","age","email"));
        List<String> headers=Arrays.asList("部門名稱","*部門名稱","成本中心");
        Workbook wb = ExcelUtil.createExcel(workbook, sheetName, data, headers);
        try (FileOutputStream os = new FileOutputStream("D:\\a.xlsx")){
            wb.write(os);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println("ok");

    }
}