easyExcel设置水印

1、依赖导入

<dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId><version>3.1.0</version></dependency>
<dependency><groupId>org.apache.poi</groupId><artifactId>ooxml-schemas</artifactId><version>1.4</version></dependency>

poi的依赖是样式设置需要用到

2、自定义水印处理器

package com.XXX.common.utils.easyexcel;import com.alibaba.excel.write.handler.SheetWriteHandler;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteWorkbookHolder;
import com.XXX.common.exception.CustomException;
import com.XXX.common.utils.SecurityUtils;
import com.XXX.project.system.domain.SysUser;
import lombok.SneakyThrows;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFRelation;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.font.FontRenderContext;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;/*** 添加水印** @author wangchen* @date 2022/11/30 16:07*/
public class CustomWaterMarkHandler implements SheetWriteHandler {public static ByteArrayOutputStream createWaterMark(String content) throws IOException {int width = 300;int height = 150;// 获取bufferedImage对象BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);String fontType = "微软雅黑";int fontStyle = Font.BOLD;int fontSize = 12;Font font = new Font(fontType, fontStyle, fontSize);// 获取Graphics2d对象Graphics2D g2d = image.createGraphics();image = g2d.getDeviceConfiguration().createCompatibleImage(width, height, Transparency.TRANSLUCENT);g2d.dispose();g2d = image.createGraphics();//设置字体颜色和透明度，最后一个参数为透明度g2d.setColor(new Color(92, 92, 92, 50));// 设置字体g2d.setStroke(new BasicStroke(1));// 设置字体类型  加粗 大小g2d.setFont(font);//设置倾斜度g2d.rotate(-0.5, (double) image.getWidth() / 2, (double) image.getHeight() / 2);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;// 写入水印文字原定高度过小，所以累计写水印，增加高度g2d.drawString(content, (int) x, (int) baseY);// 设置透明度g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));// 释放对象g2d.dispose();ByteArrayOutputStream os = new ByteArrayOutputStream();ImageIO.write(image, "png", os);return os;}public static void putWaterRemarkToExcel(XSSFSheet sheet, byte[] watermarkBytes) {XSSFWorkbook workbook = sheet.getWorkbook();int watermarkIndex = workbook.addPicture(watermarkBytes, Workbook.PICTURE_TYPE_PNG);String relationId = sheet.addRelation(null, XSSFRelation.IMAGES, workbook.getAllPictures().get(watermarkIndex)).getRelationship().getId();sheet.getCTWorksheet().addNewPicture().setId(relationId);}@Override@SneakyThrowspublic void afterSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {if (!(writeSheetHolder.getSheet() instanceof XSSFSheet)) {throw new CustomException("表格必须是XSSFSheet");}SysUser user = SecurityUtils.getLoginUser().getUser();try (ByteArrayOutputStream waterMark = createWaterMark(user.getUserName())) {XSSFSheet sheet = (XSSFSheet) writeSheetHolder.getSheet();putWaterRemarkToExcel(sheet, waterMark.toByteArray());}}
}

3、excel导出工具类

package com.XXX.common.utils.easyexcel;import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.ExcelWriter;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.function.Consumer;/*** ExcelUtils** @author wangchen* @date 2022/11/30 12:22*/
@Slf4j
public class ExcelUtils {/*** 导出数据** @param excelName           excel名字* @param excelWriterConsumer 数据*/public static void excelExport(String excelName, Consumer<ExcelWriter> excelWriterConsumer) {ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();if (requestAttributes == null) {return;}HttpServletResponse response = requestAttributes.getResponse();if (response == null) {return;}// 这里注意 有人反应使用swagger 会导致各种问题，请直接用浏览器或者用postmanresponse.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");response.setCharacterEncoding("utf-8");// 这里URLEncoder.encode可以防止中文乱码 当然和easyexcel没有关系try {String fileName = URLEncoder.encode(excelName, "UTF-8").replaceAll("\\+", "%20");response.setHeader("Content-disposition", "attachment;filename*=utf-8''" + fileName + ".xlsx");// 设置水印要将 inMemory 设置为 true ,但是会有OOM的风险ExcelWriter excelWriter = EasyExcel.write(response.getOutputStream()).inMemory(true).build();excelWriterConsumer.accept(excelWriter);excelWriter.finish();} catch (IOException e) {log.error("", e);}}
}

4、导出示例

 @GetMapping("/exportMonthReview")public void exportOnSelf(MonthlyReview monthlyReview) {List<MonthReviewDto> monthReviewDtos = monthlyReviewService.selectUserDeptMonthReview(monthlyReview);Consumer<ExcelWriter> consumer = excelWriter -> {WriteSheet writeSheet = EasyExcel.writerSheet().registerWriteHandler(new CustomWaterMarkHandler()).head(MonthReviewDto.class).build();excelWriter.write(monthReviewDtos, writeSheet);};ExcelUtils.excelExport("结果表", consumer);}

导出事例之所以用这种方式，是考虑到便于excel的sheet页样式设置

5、水印效果图

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easyExcel设置水印

1、依赖导入

2、自定义水印处理器

3、excel导出工具类

4、导出示例

5、水印效果图

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