Java 在Excel里面加水印单一水印以及平铺水印

你的名字 2023-01-15 02:19 82阅读 0赞

**程序环境：**

*  测试文档：Office Excel 2013
 *  编译环境：IntelliJ IDEA 2018
 *  JDK版本：1.8.0
 *  Excel库：Java系列free spire.xls.jar 3.9.1

import com.spire.xls.*;
    
    import java.awt.*;
    import java.awt.image.BufferedImage;
    
    import static java.awt.image.BufferedImage.TYPE_INT_ARGB;
    
    //java项目www.fhadmin.org
    public class SingleWatermark {
        public static void main(String[] args) {
            //加载Excel测试文档
            Workbook wb = new Workbook();
            wb.loadFromFile("test.xlsx");
    
            //设置文本和字体大小
            Font font = new Font("仿宋", Font.PLAIN, 40);
    
            for (int i =0;i<wb.getWorksheets().getCount();i++)
            {
                Worksheet sheet = wb.getWorksheets().get(i);
                //调用DrawText() 方法插入图片
                BufferedImage imgWtrmrk = drawText("内部专用", font, Color.pink, Color.white, sheet.getPageSetup().getPageHeight(), sheet.getPageSetup().getPageWidth());
    
                //将图片设置为页眉
                sheet.getPageSetup().setCenterHeaderImage(imgWtrmrk);
                sheet.getPageSetup().setCenterHeader("&G");
    
    
                //将显示模式设置为Layout
                sheet.setViewMode(ViewMode.Layout);
            }
    
            //保存文档
            wb.saveToFile("SingleWatermark.xlsx", ExcelVersion.Version2013);
        }
        private static BufferedImage drawText (String text, Font font, Color textColor, Color backColor,double height, double width)
        {
            //定义图片宽度和高度
            BufferedImage img = new BufferedImage((int) width, (int) height, TYPE_INT_ARGB);
    
            Graphics2D loGraphic = img.createGraphics();
    
            //获取文本size
            FontMetrics loFontMetrics = loGraphic.getFontMetrics(font);
            int liStrWidth = loFontMetrics.stringWidth(text);
            int liStrHeight = loFontMetrics.getHeight();
    
            //文本显示样式及位置
            loGraphic.setColor(backColor);
            loGraphic.fillRect(0, 0, (int) width, (int) height);
            loGraphic.translate(((int) width - liStrWidth) / 2, ((int) height - liStrHeight) / 2);
            loGraphic.rotate(Math.toRadians(-45));
    
            loGraphic.translate(-((int) width - liStrWidth) / 2, -((int) height - liStrHeight) / 2);
            loGraphic.setFont(font);
            loGraphic.setColor(textColor);
            loGraphic.drawString(text, ((int) width - liStrWidth) / 2, ((int) height - liStrHeight) / 2);
            loGraphic.dispose();
            return img;
        }
    }

单一水印效果：

![706090-20210420110031855-1923561781.png][]

### **2.****平铺水印效果** ###

import com.spire.xls.*;
    
    import java.awt.*;
    import java.awt.image.BufferedImage;
    
    import static java.awt.image.BufferedImage.TYPE_INT_ARGB;
    
    //java项目www.fhadmin.org
    public class TiledWatermark {
        public static void main(String[] args) {
            //加载Excel测试文档
            Workbook wb = new Workbook();
            wb.loadFromFile("test.xlsx");
    
            //设置文本和字体大小
            Font font = new Font("仿宋", Font.PLAIN, 25);
    
            for (int i =0;i<wb.getWorksheets().getCount();i++)
            {
                Worksheet sheet = wb.getWorksheets().get(i);
                //调用DrawText() 方法插入图片
                BufferedImage imgWtrmrk = drawText("内部专用     内部专用     内部专用     内部专用", font, Color.pink, Color.white, sheet.getPageSetup().getPageHeight(), sheet.getPageSetup().getPageWidth());
    
                //将图片设置为页眉
                sheet.getPageSetup().setCenterHeaderImage(imgWtrmrk);
                sheet.getPageSetup().setCenterHeader("&G");
    
                //将显示模式设置为Layout
                sheet.setViewMode(ViewMode.Layout);
            }
    
            //保存文档
            wb.saveToFile("TiledWatermark.xlsx", ExcelVersion.Version2013);
        }
        private static BufferedImage drawText (String text, Font font, Color textColor, Color backColor,double height, double width)
        {
            //定义图片宽度和高度
            BufferedImage img = new BufferedImage((int) width, (int) height, TYPE_INT_ARGB);
    
            Graphics2D loGraphic = img.createGraphics();
    
            //获取文本size
            FontMetrics loFontMetrics = loGraphic.getFontMetrics(font);
            int liStrWidth = loFontMetrics.stringWidth(text);
            int liStrHeight = loFontMetrics.getHeight();
    
            //文本显示样式及位置
            loGraphic.setColor(backColor);
            loGraphic.fillRect(0, 0, (int) width, (int) height);
            loGraphic.translate(((int) width - liStrWidth) / 2, ((int) height - liStrHeight) / 2);
            //loGraphic.rotate(Math.toRadians(-45));
    
            loGraphic.translate(-((int) width - liStrWidth) / 2, -((int) height - liStrHeight) / 2);
            loGraphic.setFont(font);
            loGraphic.setColor(textColor);
            loGraphic.drawString(text, ((int) width - liStrWidth) /6 , ((int) height - liStrHeight) /6);
            loGraphic.drawString(text,((int) width - liStrWidth) /3, ((int) height - liStrHeight) /3);
            loGraphic.drawString(text,((int) width - liStrWidth) /2, ((int) height - liStrHeight) /2);
            loGraphic.dispose();
            return img;
        }
    }

![wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==][wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw]

平铺水印效果：

![92d3d7c3b8d9879ac0e8b73cc1fb1f39.png][]

★ 需要注意的是：在添加完水印效果后，查看文档时，在“普通视图”水印不可见，需在“页面布局”模式或“打印预览”模式下查看。

[706090-20210420110031855-1923561781.png]: /images/20221022/3396c9c1e06042328bd20b0fcac48afa.png
[wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw]: 
[92d3d7c3b8d9879ac0e8b73cc1fb1f39.png]: /images/20221022/62c513cc30cd4994a51022de9cff278f.png