easyExcel添加水印

1controller层

2service层

红框内是需要加水印的
如果不要红框,就是不加水印

下面是

package cn.com.doone.sc.tx.cloud.ap.ht.controller.excel;

import com.alibaba.excel.write.handler.SheetWriteHandler;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteWorkbookHolder;
import lombok.RequiredArgsConstructor;
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.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

/**

@PackageName:cn.com.doone.sc.tx.cloud.ap.ht.controller.excel
@ClassName:WaterMarkHandler
@Description:
@author:@liufei
@date 2021/6/16 11:10
*/
@RequiredArgsConstructor
public class WaterMarkHandler implements SheetWriteHandler {

private final String WATER_MARK;

public static ByteArrayOutputStream createWaterMark(String content) throws IOException {
int width = 200;
int height = 150;
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);// 获取bufferedImage对象
String fontType = “微软雅黑”;
int fontStyle = Font.BOLD;
int fontSize = 20;
Font font = new Font(fontType, fontStyle, fontSize);
Graphics2D g2d = image.createGraphics(); // 获取Graphics2d对象
image = g2d.getDeviceConfiguration().createCompatibleImage(width, height, Transparency.TRANSLUCENT);
g2d.dispose();
g2d = image.createGraphics();
g2d.setColor(new Color(0, 0, 0, 20)); //设置字体颜色和透明度，最后一个参数为透明度
g2d.setStroke(new BasicStroke(1)); // 设置字体
g2d.setFont(font); // 设置字体类型加粗大小
g2d.rotate(-0.5, (double) image.getWidth() / 2, (double) image.getHeight() / 2);//设置倾斜度
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;
// 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;
}

/**
- 为Excel打上水印工具函数
- @param sheet excel sheet
- @param bytes 水印图片字节数组
  */
  public static void putWaterRemarkToExcel(XSSFSheet sheet, byte[] bytes) {
  //add relation from sheet to the picture data
  XSSFWorkbook workbook = sheet.getWorkbook();
  int pictureIdx = workbook.addPicture(bytes, Workbook.PICTURE_TYPE_PNG);
  String rID = sheet.addRelation(null, XSSFRelation.IMAGES, workbook.getAllPictures().get(pictureIdx))
  .getRelationship().getId();
  //set background picture to sheet
  sheet.getCTWorksheet().addNewPicture().setId(rID);
  }
@Override
public void beforeSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {
}

@SneakyThrows
@Override
public void afterSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {
try (ByteArrayOutputStream waterMark = createWaterMark(WATER_MARK)){
XSSFSheet sheet = (XSSFSheet) writeSheetHolder.getSheet();
putWaterRemarkToExcel(sheet, waterMark.toByteArray());
}
}
}

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