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Java實(shí)現(xiàn)Excel導(dǎo)出并添加水印

更新時(shí)間：2024年11月17日 15:52:36 作者：程序修理員

這篇文章主要為大家詳細(xì)介紹了Java如何使用poi-ooxml包導(dǎo)出xlsx添加水印,文中的示例代碼講解詳細(xì),感興趣的小伙伴可以跟隨小編一起學(xué)習(xí)一下

1、添加相關(guān)依賴(lài)

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-compress</artifactId>
            <version>1.22</version>
        </dependency>
        <!-- Apache POI for Excel -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>5.2.3</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>5.2.3</version>
        </dependency>
        <!-- Apache POI dependencies -->
        <dependency>
            <groupId>org.apache.xmlbeans</groupId>
            <artifactId>xmlbeans</artifactId>
            <version>5.1.1</version>
        </dependency>

2、生成水印代碼

public static ByteArrayOutputStream createWaterMark(String content)
            throws IOException {
        // 這是水印字體的寬和高，可以調(diào)整這個(gè)大小來(lái)控制
        int width = 200;
        int height = 150;
        BufferedImage image = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_RGB);// 獲取bufferedImage對(duì)象
        String fontType = "微軟雅黑";
        int fontStyle = Font.BOLD;
        // 這是水印顯示字體的大小
        int fontSize = 20;
        Font font = new Font(fontType, fontStyle, fontSize);
        Graphics2D g2d = image.createGraphics(); // 獲取Graphics2d對(duì)象
        image = g2d.getDeviceConfiguration().createCompatibleImage(width,
                height, Transparency.TRANSLUCENT);
        g2d.dispose();
        g2d = image.createGraphics();
        g2d.setColor(new Color(0, 0, 0, 20)); // 設(shè)置字體顏色和透明度，最后一個(gè)參數(shù)為透明度
        g2d.setStroke(new BasicStroke(1)); // 設(shè)置字體
        g2d.setFont(font); // 設(shè)置字體類(lèi)型 加粗 大小
        g2d.rotate(-0.5, (double) image.getWidth() / 2,
                (double) image.getHeight() / 2);// 設(shè)置傾斜度
        FontRenderContext context = g2d.getFontRenderContext();
        Rectangle2D bounds = font.getStringBounds(content, context);
        double x = (width - bounds.getWidth()) / 2;
        double y = (height - bounds.getHeight()) / 2;
        double ascent = -bounds.getY();
        double baseY = y + ascent;
        // 寫(xiě)入水印文字原定高度過(guò)小，所以累計(jì)寫(xiě)水印，增加高度
        g2d.drawString(content, (int) x, (int) baseY);
        // 設(shè)置透明度
        g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));
        // 釋放對(duì)象
        g2d.dispose();
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        ImageIO.write(image, "png", os);
        return os;
    }

目前生成圖片的效果圖如下，如果像調(diào)整誰(shuí)

3、excel調(diào)用水印代碼

    public static void main(String[] args) throws IOException {
        XSSFWorkbook workbook = new XSSFWorkbook();
        XSSFSheet sheet = workbook.createSheet("Sheet1");
        ByteArrayOutputStream byteArrayOutputStream = createWaterMark("水印內(nèi)容");
        int pictureIdx = workbook.addPicture(byteArrayOutputStream.toByteArray()
                ,Workbook.PICTURE_TYPE_PNG);
        String rID = sheet.addRelation(null, XSSFRelation.IMAGES,workbook
                .getAllPictures().get(pictureIdx)).getRelationship().getId();
        sheet.getCTWorksheet().addNewPicture().setId(rID);

        // 創(chuàng)建一個(gè)行對(duì)象
        XSSFRow row = sheet.createRow(0);  // 第一行

        // 在行中創(chuàng)建單元格并設(shè)置值
        XSSFCell cell = row.createCell(0); // 第一列
        cell.setCellValue("Hello, Excel!");

        // 寫(xiě)入到文件系統(tǒng)
        try (FileOutputStream outputStream = new FileOutputStream("Example.xlsx")) {
            workbook.write(outputStream);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                workbook.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }