Spring Boot集成OpenPDF和Freemarker实现PDF导出功能教程配套源码

package com.toher.project.openpdf; /** * @Author 李怀明 * @Date 2024/7/28 12:35 AM * @Version 1.0 */ import com.lowagie.text.Font; import com.lowagie.text.*; import com.lowagie.text.Image; import com.lowagie.text.alignment.HorizontalAlignment; import com.lowagie.text.alignment.VerticalAlignment; import com.lowagie.text.html.simpleparser.HTMLWorker; import com.lowagie.text.pdf.*; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.ui.freemarker.FreeMarkerTemplateUtils; import org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer; import org.xhtmlrenderer.pdf.ITextRenderer; import java.awt.*; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.StringReader; import java.util.Map; @Service public class OpenPdfService { @Autowired private FreeMarkerConfigurer freeMarkerConfigurer; public byte[] generatePdf() throws Exception { ByteArrayOutputStream out = new ByteArrayOutputStream(); // 创建PDF文档 Document document = new Document(); PdfWriter writer = PdfWriter.getInstance(document, out); //如果需要定义字体，将自己的字体放在 resources/fonts目录下 //BaseFont font = BaseFont.createFont("fonts/Viaoda_Libre/ViaodaLibre-Regular.ttf", BaseFont.IDENTITY_H, false); BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED); Font docFont = new Font(bfChinese, 10, Font.UNDEFINED, Color.BLACK); //设置水印 writer.setPageEvent(new PdfPageEventHelper() { @Override public void onEndPage(PdfWriter writer, Document document) { PdfContentByte waterMar = writer.getDirectContentUnder(); String text = "Micro麦可乐"; addTextFullWaterMark(waterMar, text, bfChinese); } }); // 设置边距 document.setMargins(20, 20, 20, 20); // 打开文档 document.open(); /** * 01 表格演示 */ String[] tableTitle = new String[]{"清单", "数量", "单价", "总价"}; Table table = new Table(tableTitle.length); table.setWidths(new float[]{70, 10, 10, 10}); // 设置表格前的间距 table.setSpacing(0); // 设置表格在页面中所占的宽度百分比 table.setWidth(100); table.setBorder(0); //模拟5行表格数据 for (int row = 0; row < 5; row++) { for (int i = 0; i < tableTitle.length; i++) { Chunk chunk; if (row == 0) { chunk = new Chunk(tableTitle[i], docFont); } else { chunk = new Chunk(row + "行 模拟数据" + i, docFont); } // 建立单元格 Cell cell = new Cell(chunk); // 设置水平对齐 cell.setHorizontalAlignment(HorizontalAlignment.CENTER); // 设置垂直对齐 cell.setVerticalAlignment(VerticalAlignment.CENTER); table.addCell(cell); } } document.add(table); /** * 02 写入图片 */ byte[] byteArray = new byte[0]; InputStream inputStream = this.getClass().getResourceAsStream("/static/img/test.png"); if (inputStream != null) { byteArray = new byte[inputStream.available()]; inputStream.read(byteArray); } Image image = Image.getInstance(byteArray); // 图片进行缩放 image.scaleAbsolute(200, 200); document.add(image); /** * 03 写入html模版内容 */ HTMLWorker htmlWorker = new HTMLWorker(document); String html = "

Hello, micro

"; htmlWorker.parse(new StringReader(html)); // 关闭文档 document.close(); return out.toByteArray(); } public static void addTextFullWaterMark(PdfContentByte waterMar, String text, BaseFont bfChinese) { waterMar.beginText(); PdfGState gs = new PdfGState(); // 设置填充字体不透明度为0.2f gs.setFillOpacity(0.2f); waterMar.setFontAndSize(bfChinese, 40); // 设置透明度 waterMar.setGState(gs); // 设置水印对齐方式 水印内容 X坐标 Y坐标 旋转角度 for (int x = 0; x <= 700; x += 200) { for (int y = 0; y <= 800; y += 200) { waterMar.showTextAligned(Element.ALIGN_RIGHT, text, x, y, 35); } } // 设置水印颜色 waterMar.setColorFill(Color.GRAY); //结束设置 waterMar.endText(); waterMar.stroke(); } }