Java Apache Poi,如何同时设置背景颜色和边框

Question

一开始我想说我在开发者世界里是全新的.

我试图生成一个excel表,其中包含带边框的Mutiplication Table并设置背景颜色,但仅适用于第1列和第1行.

这是一个正确的例子:正确的例子

我写了类似的东西,但在结果文件中,彩色单元格没有边框:(.

请解释我如何同时设置背景颜色和边框.

import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.IndexedColors;

import java.awt.image.IndexColorModel;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Scanner;

public class Excel {
    public static void main(String[] args) throws IOException {

        Scanner in = new Scanner(System.in);

        System.out.println("enter number of rows: ");
        int x = in.nextInt();
        System.out.println("enter number of columns: ");
        int y = in.nextInt();
        System.out.println("enter name of file: ");
        String fileName = in.next() + ".xls";

        System.out.println("Multiplication table will be created in file: " + fileName);

        createExcelMultiplicationTable(fileName, x, y);

        System.out.println("Process successful executed");
    }

    private static void createExcelMultiplicationTable(String fileName, int x, int y) throws IOException {
        Workbook workbook = new HSSFWorkbook();
        Sheet sheet = workbook.createSheet("multiplicationTable");

        CellStyle backgroundStyle = workbook.createCellStyle();

        backgroundStyle.setFillBackgroundColor(IndexedColors.GREY_50_PERCENT.getIndex());
        backgroundStyle.setFillPattern(CellStyle.SOLID_FOREGROUND);

        CellStyle borderStyle = workbook.createCellStyle();

        borderStyle.setBorderBottom(CellStyle.BORDER_THIN);
        borderStyle.setBottomBorderColor(IndexedColors.BLACK.getIndex());
        borderStyle.setBorderLeft(CellStyle.BORDER_THIN);
        borderStyle.setLeftBorderColor(IndexedColors.BLACK.getIndex());
        borderStyle.setBorderRight(CellStyle.BORDER_THIN);
        borderStyle.setRightBorderColor(IndexedColors.BLACK.getIndex());
        borderStyle.setBorderTop(CellStyle.BORDER_THIN);
        borderStyle.setTopBorderColor(IndexedColors.BLACK.getIndex());

        for (int i = 1; i <= x; i++) {
            Row row = sheet.createRow(i - 1);

            for (int j = 1; j <= y; j++) {
                Cell cell = row.createCell(j - 1);
                cell.setCellValue(i * j);
                cell.setCellStyle(borderStyle);

                if (cell.getRowIndex() == 0 || cell.getColumnIndex() == 0) {
                    cell.setCellStyle(backgroundStyle);
                }
            }
        }

        FileOutputStream out = new FileOutputStream(fileName);
        workbook.write(out);
        out.close();
    }
}

Answer 1

改变 backgroundStyle.setFillBackgroundColor(IndexedColors.GREY_50_PERCENT.getIndex());以

 backgroundStyle.setFillForegroundColor(IndexedColors.YELLOW.getIndex());

你可以设置如下边框:

        backgroundStyle.setBorderBottom(CellStyle.BORDER_THIN);
        backgroundStyle.setBottomBorderColor(IndexedColors.BLACK.getIndex());
        backgroundStyle.setBorderLeft(CellStyle.BORDER_THIN);
        backgroundStyle.setLeftBorderColor(IndexedColors.BLACK.getIndex());
        backgroundStyle.setBorderRight(CellStyle.BORDER_THIN);
        backgroundStyle.setRightBorderColor(IndexedColors.BLACK.getIndex());
        backgroundStyle.setBorderTop(CellStyle.BORDER_THIN);
        backgroundStyle.setTopBorderColor(IndexedColors.BLACK.getIndex());

这将根据需要为您提供黄色和边框

Answer 2

你真正的问题是你有两个样式,一个名为backgroundStyle,另一个名为borderStyle.然后,您将两种样式应用于同一单元格,但单元格只能有一种样式,因此您将使用第二种样式覆盖第一种样式,而不是添加第二种样式.

代替:

    CellStyle backgroundStyle = workbook.createCellStyle();

    backgroundStyle.setFillBackgroundColor(IndexedColors.GREY_50_PERCENT.getIndex());
    backgroundStyle.setFillPattern(CellStyle.SOLID_FOREGROUND);

    CellStyle borderStyle = workbook.createCellStyle();

    borderStyle.setBorderBottom(CellStyle.BORDER_THIN);
    borderStyle.setBottomBorderColor(IndexedColors.BLACK.getIndex());
    borderStyle.setBorderLeft(CellStyle.BORDER_THIN);
    borderStyle.setLeftBorderColor(IndexedColors.BLACK.getIndex());
    borderStyle.setBorderRight(CellStyle.BORDER_THIN);
    borderStyle.setRightBorderColor(IndexedColors.BLACK.getIndex());
    borderStyle.setBorderTop(CellStyle.BORDER_THIN);
    borderStyle.setTopBorderColor(IndexedColors.BLACK.getIndex());

只需创建一个这样的单一样式:

    CellStyle backgroundStyle = workbook.createCellStyle();

    backgroundStyle.setFillBackgroundColor(IndexedColors.GREY_50_PERCENT.getIndex());
    backgroundStyle.setFillPattern(CellStyle.SOLID_FOREGROUND);

    backgroundStyle.setBorderBottom(CellStyle.BORDER_THIN);
    backgroundStyle.setBottomBorderColor(IndexedColors.BLACK.getIndex());
    backgroundStyle.setBorderLeft(CellStyle.BORDER_THIN);
    backgroundStyle.setLeftBorderColor(IndexedColors.BLACK.getIndex());
    backgroundStyle.setBorderRight(CellStyle.BORDER_THIN);
    backgroundStyle.setRightBorderColor(IndexedColors.BLACK.getIndex());
    backgroundStyle.setBorderTop(CellStyle.BORDER_THIN);
    backgroundStyle.setTopBorderColor(IndexedColors.BLACK.getIndex());

然后将其应用于您的单元格:

    Sheet sheet = workbook.createSheet();
    Row row = sheet.createRow(1);
    Cell cell = row.createCell(1);
    cell.setCellStyle(backgroundStyle);

注意:如此处的其他答案中所述,FillPattern = SOLID_FOREGROUND忽略背景颜色,您必须为该模式设置前景颜色.这可能会造成混淆,因为您尝试将单元格背景设置为纯色.但是cell background不一样background color.Cell background与Fill Pattern具有两种颜色a Foreground Color和a 的相同Background Color是基于所Fill Pattern选择的特定颜色显示的.该SOLID_FOREGROUND填充只使用Foreground Color.

Answer 3

从POI 3.x开始,单元格填充颜色设置如下:

CellStyle cs = wb.createCellStyle(); cs.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex()); cs.setFillPattern(FillPatternType.SOLID_FOREGROUND);