爱站程序员基地程序环境：
- 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.orgpublic 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：
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.orgpublic 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; }}
平铺水印效果：
★ 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。
