基于IText7 PDF模板填充？

引入依赖

<dependency><groupId>com.itextpdf</groupId><artifactId>itext7-core</artifactId><version>8.0.1</version><type>pom</type>
</dependency>
<dependency><groupId>com.itextpdf</groupId><artifactId>bouncy-castle-adapter</artifactId><version>8.0.1</version>
</dependency>

模板填充工具

import com.itextpdf.forms.PdfAcroForm;
import com.itextpdf.forms.fields.PdfFormCreator;
import com.itextpdf.forms.fields.PdfFormField;
import com.itextpdf.io.font.PdfEncodings;
import com.itextpdf.io.image.ImageData;
import com.itextpdf.io.image.ImageDataFactory;
import com.itextpdf.kernel.font.PdfFont;
import com.itextpdf.kernel.font.PdfFontFactory;
import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.kernel.pdf.*;
import com.itextpdf.kernel.pdf.annot.PdfAnnotation;
import com.itextpdf.kernel.pdf.annot.PdfWidgetAnnotation;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
import com.muchenx.util.ImageCompressUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;/*** PDF 模板填充工具类（itext7）* <p>* 支持文本 及 图片 填充*/
@Slf4j
public final class PDFTemplateFillHandler {/*** 待填充的PDF模板文档*/private final transient PdfDocument templateDocument;/*** 填充后PDF文档数据*/private final transient ByteArrayOutputStream destByteOutStream;/*** 字体*/private transient PdfFont font;private PDFTemplateFillHandler(PdfDocument templateDocument, ByteArrayOutputStream destByteOutStream) {this.templateDocument = templateDocument;this.destByteOutStream = destByteOutStream;try {this.font = loadFont();} catch (IOException e) {log.warn("加载指定字体异常：{}", e.getMessage());}}public static PDFTemplateFillHandler loadTemplate(InputStream templateFileStream) {try {ByteArrayOutputStream dest = new ByteArrayOutputStream();PdfDocument pdfDocument = new PdfDocument(new PdfReader(templateFileStream), new PdfWriter(dest));return new PDFTemplateFillHandler(pdfDocument, dest);} catch (IOException e) {throw new RuntimeException(e);}}/*** 填充及返回填充后的数据** @param fillData - 待填充数据* @return - 填充后bytes数据*/public byte[] fill(Map<String, Object> fillData) {try {PdfAcroForm form = PdfAcroForm.getAcroForm(templateDocument, true);fillData.forEach((keyword, value) -> {Optional.ofNullable(form.getField(keyword)).ifPresent(templateFormField -> {if (value instanceof byte[]) {PdfArray pos = templateFormField.getWidgets().get(0).getRectangle();float x = pos.getAsNumber(0).floatValue();float y = pos.getAsNumber(1).floatValue();float width = pos.getAsNumber(2).floatValue() - x;float height = pos.getAsNumber(3).floatValue() - y;Rectangle rectangle = new Rectangle(x, y, width, height);PdfWidgetAnnotation widget = new PdfWidgetAnnotation(rectangle);PdfFormField formField = PdfFormCreator.createFormField(widget, templateDocument);PdfPage annotationPage = findAnnotationPage(keyword);if (annotationPage != null) {doFillFieldImage(annotationPage, formField, (byte[]) value);}} else {templateFormField.setValue(String.valueOf(value));if (font != null) {templateFormField.setFont(templateFormField.getFont());}}form.partialFormFlattening(keyword);});});form.flattenFields();} finally {if (templateDocument != null) {templateDocument.close();}}return destByteOutStream.toByteArray();}/*** 图片填充** @param newPage   - 当前页* @param formField - 表单文本域* @param imgBytes  - 图片文件字节数组*/private void doFillFieldImage(PdfPage newPage, PdfFormField formField, byte[] imgBytes) {Rectangle rtl = formField.getWidgets().get(0).getRectangle().toRectangle(); // 获取表单域的xy坐标PdfCanvas canvas = new PdfCanvas(newPage);ImageData img = ImageDataFactory.create(imgBytes);if (Float.compare(img.getWidth(), rtl.getWidth()) <= 0 && Float.compare(img.getHeight(), rtl.getHeight()) <= 0) {// 不处理canvas.addImageAt(img, rtl.getX(), rtl.getY(), true);} else {// 压缩图片。计算得到图片放缩的最大比例float scale = Math.max(img.getWidth() / rtl.getWidth(), img.getHeight() / rtl.getHeight());int imgWidth = Math.round(img.getWidth() / scale);int imgHeight = Math.round(img.getHeight() / scale);// 压缩图片byte[] compressImgBytes;try {compressImgBytes = ImageCompressUtils.resizeByThumbnails(imgBytes, imgWidth, imgHeight);} catch (IOException e) {throw new RuntimeException(e);}img = ImageDataFactory.create(compressImgBytes);canvas.addImageAt(img, rtl.getX(), rtl.getY(), true);}}/*** 根据表单域关键字查找当前关键字所在页对象（PdfPage）** @param keyword - 关键字* @return - page object*/private PdfPage findAnnotationPage(String keyword) {int pages = templateDocument.getNumberOfPages();for (int index = 1; index <= pages; index++) {PdfPage page = templateDocument.getPage(index);for (PdfAnnotation annotation : page.getAnnotations()) {PdfString title = annotation.getPdfObject().getAsString(PdfName.T);if (title != null && keyword.equals(String.valueOf(title))) {return page;}}}return null;}/*** 获取模板文件表单域关键字位置信息*/private Map<Integer, Map<String, float[]>> getFormKeywordsPos() {int pages = templateDocument.getNumberOfPages();Map<Integer, Map<String, float[]>> maps = new HashMap<>(pages);for (int index = 1; index <= pages; index++) {maps.putIfAbsent(index, new HashMap<>());PdfPage page = templateDocument.getPage(index);// 获取当前页的表单域int finalIndex = index;page.getAnnotations().forEach(anno -> {PdfString title = anno.getTitle();PdfArray rectangle = anno.getRectangle();float x = rectangle.getAsNumber(0).floatValue();float y = rectangle.getAsNumber(1).floatValue();float width = rectangle.getAsNumber(2).floatValue() - x;float height = rectangle.getAsNumber(3).floatValue() - y;maps.get(finalIndex).put(title.getValue(), new float[]{x, y, width, height});});}return maps;}/*** 加载字体*/private PdfFont loadFont() throws IOException {Resource[] resources = new PathMatchingResourcePatternResolver().getResources("classpath*:/font/*.ttc");if (resources.length == 0) {return null;}PdfFontFactory.register(resources[0].getURL().getPath(), "SimSun");return PdfFontFactory.createRegisteredFont("SimSun", PdfEncodings.IDENTITY_H,PdfFontFactory.EmbeddingStrategy.PREFER_NOT_EMBEDDED);}
}

填充实例

LocalDate now = LocalDate.now();
// 图片文件
ByteArrayOutputStream catOutStream = new ByteArrayOutputStream();
File img = ResourceUtils.getFile("classpath:cat.png");
InputStream catInStream = Files.newInputStream(img.toPath());
IOUtils.copy(catInStream, catOutStream);
Map<String, Object> data = new HashMap<>();
data.put("username", "喵星人");
data.put("gender", "女");
data.put("nation", "狗");
data.put("school", "狗族大学");
data.put("describe", "千百年来，地球上一直住着一种外星生物，名叫喵星人。它们从遥远的喵星来到地球，化身为猫科动物，分散在世界每个角落。萌萌的外表，加上机智聪明的头脑，轻易就得到人类的宠爱。");
data.put("describe1", "千百年来，地球上一直住着一种外星生物，名叫喵星人。它们从遥远的喵星来到地球，化身为猫科动物，分散在世界每个角落。萌萌的外表，加上机智聪明的头脑，轻易就得到人类的宠爱。");
data.put("content", "千百年来，地球上一直住着一种外星生物，名叫喵星人。它们从遥远的喵星来到地球，化身为猫科动物，分散在世界每个角落。萌萌的外表，加上机智聪明的头脑，轻易就得到人类的宠爱。");
data.put("sign", catOutStream.toByteArray());
data.put("avatar", catOutStream.toByteArray());
data.put("year", String.valueOf(now.getYear()));
data.put("month", String.valueOf(now.getMonthValue()));
data.put("day", String.valueOf(now.getDayOfMonth()));String homePath = FileSystemView.getFileSystemView().getHomeDirectory().getAbsolutePath();
File template = ResourceUtils.getFile("classpath:fill_template.pdf");
byte[] filledDataBytes = PDFTemplateFillHandler.loadTemplate(Files.newInputStream(template.toPath())).fill(data);
IOUtils.write(filledDataBytes, Files.newOutputStream(Paths.get(homePath + "/" + System.nanoTime() + ".pdf")));

基于IText7 的 PDF表单域模板填充