Java下载excel文件并且添加水印效果

文件下载公共类

package com.sw.api.utils;import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.xssf.usermodel.*;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;public class ExportUtil {public void export(HttpServletResponse response) throws IOException {//根据文件流创建XSSFWorkbook对象XSSFWorkbook wb = new XSSFWorkbook();//XSSFSheet sheet = wb.getSheetAt(0);XSSFSheet sheet = wb.createSheet("Sheet1");sheet.setDefaultColumnWidth(16);//设置默认列宽sheet.setDefaultRowHeightInPoints(20);//设置默认行高//设置样式;XSSFCellStyle style = wb.createCellStyle();//设置水平对齐的样式为居中对齐;style.setAlignment(HorizontalAlignment.CENTER);//设置垂直对齐的样式为居中对齐;style.setVerticalAlignment(VerticalAlignment.CENTER);XSSFRow rowRowName = sheet.createRow(0);//设置水印WaterMarkUtil.putWaterMarkToExcel(wb);// 将列头设置到sheet的单元格中String[] rowName =  new String[] {"id", "年龄", "名称"};for(int n=0;n<rowName.length;n++){XSSFCell cellRowName = rowRowName.createCell(n);cellRowName.setCellValue(rowName[n]);cellRowName.setCellStyle(style);}//造数据，dataList可以是数据库查询出来的业务数据，动态传参过来List<Object[]> dataList = new ArrayList<Object[]>();Object[] objs1 = new Object[rowName.length];objs1[0] = "1";objs1[1] = "12";objs1[2] = "张三";dataList.add(objs1);Object[] objs2 = new Object[rowName.length];objs2[0] = "2";objs2[1] = "22";objs2[2] = "李四";dataList.add(objs2);//将查询出的数据设置到sheet对应的单元格中for(int i = 0;i < dataList.size();i++){Object[] obj = dataList.get(i);XSSFRow row = sheet.createRow(i+1);//row.setHeight((short) (25 * 20));for(int j = 0; j < obj.length; j++){Cell cell = null;cell = row.createCell(j);if(!"".equals(obj[j]) && obj[j] != null){cell.setCellValue(obj[j].toString());cell.setCellStyle(style);}}}//输出Excel文件OutputStream output= response.getOutputStream();response.reset();String date = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date());String fileName = date + ".xlsx";response.setHeader("Content-Disposition","attachment; filename=" +new String(fileName.getBytes("UTF-8"), "iso-8859-1")+".xlsx");response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8");wb.write(output);output.close();}}

添加水印公共类

package com.sw.api.utils;import org.apache.poi.ooxml.POIXMLDocumentPart;
import org.apache.poi.openxml4j.opc.PackagePartName;
import org.apache.poi.openxml4j.opc.PackageRelationship;
import org.apache.poi.openxml4j.opc.TargetMode;
import org.apache.poi.ss.usermodel.*;
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;
import java.awt.font.FontRenderContext;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;public class WaterMarkUtil {private static BufferedImage createWaterMark(String[] content) {Integer width = 420;//水印宽度Integer height = 380;//水印高度BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);// 获取bufferedImage对象String fontType = "STSongti-SC-Bold";Integer fontStyle = Font.BOLD;Integer fontSize = 35;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 java.awt.Color(0, 0, 0, 50));g2d.setStroke(new BasicStroke(1));g2d.setFont(font);g2d.rotate(Math.toRadians(-30),(double) image.getWidth() / 2, (double) image.getHeight() / 2);//设置旋转角度FontRenderContext context = g2d.getFontRenderContext();//找到水印信息中最长的int contentLindex = 0;int contentLength = content[0].length();for (int i = 0; i < content.length; i++) {if (content[i].length()>contentLength) {contentLindex = i;}}Rectangle2D bounds = font.getStringBounds(content[contentLindex], 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for (int i = 0; i < content.length; i++) {g2d.drawString(content[i], (int)x, (int)baseY);// 画出字符串baseY = baseY + font.getSize();}// 设置透明度g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.1F));g2d.dispose();return image;}public static void putWaterMarkToExcel(XSSFWorkbook workbook) throws IOException {BufferedImage image = createWaterMark(new String[]{"水印名称logo"});ByteArrayOutputStream os = new ByteArrayOutputStream();ImageIO.write(image, "png", os);int pictureIdx = workbook.addPicture(os.toByteArray(), Workbook.PICTURE_TYPE_PNG);POIXMLDocumentPart poixmlDocumentPart = workbook.getAllPictures().get(pictureIdx);XSSFSheet sheet = workbook.getSheetAt(0);PackagePartName ppn = poixmlDocumentPart.getPackagePart().getPartName();String relType = XSSFRelation.IMAGES.getRelation();PackageRelationship pr = sheet.getPackagePart().addRelationship(ppn, TargetMode.INTERNAL, relType, null);sheet.getCTWorksheet().addNewPicture().setId(pr.getId());}}

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