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java 读取pdf文件内容_java读取pdf内容，零基础入门到精通，收藏这篇就够了

news 2026/4/2 15:21:13

方式一

1、引入maven

<dependency> <groupId>org.apache.pdfbox</groupId> <artifactId>pdfbox</artifactId> <version>2.0.25</version> </dependency>

2、代码工具类

//import com.itextpdf.text.pdf.PdfReader; //import com.itextpdf.text.pdf.parser.PdfTextExtractor; //import com.itextpdf.text.pdf.parser.SimpleTextExtractionStrategy; import com.google.common.collect.Lists; import com.jiayou.peis.entity.ImageObject; import org.apache.commons.io.FileUtils; import org.apache.pdfbox.Loader; import org.apache.pdfbox.cos.COSName; import org.apache.pdfbox.pdmodel.PDDocument; import org.apache.pdfbox.pdmodel.PDResources; import org.apache.pdfbox.pdmodel.common.PDStream; import org.apache.pdfbox.pdmodel.graphics.PDXObject; import org.apache.pdfbox.pdmodel.graphics.image.PDImage; import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject; import org.apache.pdfbox.text.PDFTextStripper; import javax.imageio.ImageIO; import java.awt.image.BufferedImage; import java.io.*; import java.util.ArrayList; import java.util.List; /** * PDF处理 * */ public class PdfUtils { // /** // * 使用itextpdf提取PDF文本（解析不靠谱） // * // * @param inputStream // * @return // * @throws IOException // */ // @Deprecated // public static String toText(InputStream inputStream) throws IOException { // try { // StringBuilder buf = new StringBuilder(); // PdfReader reader = new PdfReader(inputStream); // int pageNum = reader.getNumberOfPages(); // for(int i=1;i<=pageNum;i++){ // // 读取第i页的文档内容 // buf.append(PdfTextExtractor.getTextFromPage(reader, i, new SimpleTextExtractionStrategy())); // } //// return buf.toString(); // return StrUtils.removeReturnChar(buf.toString()); // } finally { // CloseUtils.closeQuietly(inputStream); // } // } public static String text(byte[] data) throws IOException { return PdfUtils.text(data, true); } public static String text(byte[] data, boolean sortByPosition) throws IOException { ByteArrayInputStream inputStream = new ByteArrayInputStream(data); return PdfUtils.text(inputStream, sortByPosition); } /** * 使用pdfbox提取PDF文本（解析正常，可使用） * * @param file * @return * @throws IOException */ public static String text(File file, boolean sortByPosition) throws IOException { InputStream inputStream = new FileInputStream(file); return PdfUtils.text(inputStream, sortByPosition); } public static String text(File file) throws IOException { return PdfUtils.text(file, true); } public static String text(InputStream inputStream) throws IOException { return text(inputStream, true); } /** * 使用pdfbox提取PDF文本（解析正常，可使用） * * @param inputStream * @return * @throws IOException */ public static String text(InputStream inputStream, boolean sortByPosition) throws IOException { PDDocument document = null; try { // document = PDDocument.load(inputStream); document = Loader.loadPDF(inputStream); PDFTextStripper textStripper = new PDFTextStripper(); // Get total page count of the PDF document int numberOfPages = document.getNumberOfPages(); //set the first page to be extracted textStripper.setStartPage(1); // set the last page to be extracted textStripper.setEndPage(numberOfPages); // 获取文本内容 textStripper.setSortByPosition(sortByPosition); textStripper.setShouldSeparateByBeads(true); return StrUtils.removeReturnChar(textStripper.getText(document)); } finally { CloseUtils.closeQuietly(document, inputStream); } } /** * 使用pdfbox提取PDF文本（解析正常，可使用） * * @param file * @return * @throws IOException */ public static List<ImageObject> images(File file) throws IOException { InputStream inputStream = new FileInputStream(file); return PdfUtils.images(inputStream); } public static List<ImageObject> images(byte[] data) throws IOException { ByteArrayInputStream inputStream = null; try { inputStream = new ByteArrayInputStream(data); return PdfUtils.images(inputStream); } finally { CloseUtils.closeQuietly(inputStream); } } /** * 使用pdfbox提取PDF图片列表 * * @param inputStream * @return * @throws IOException */ public static List<ImageObject> images(InputStream inputStream) throws IOException { List<ImageObject> imageList = Lists.newArrayList(); PDDocument document = null; try { // document = PDDocument.load(inputStream); document = Loader.loadPDF(inputStream); // get resources for a page PDResources pdResources = document.getPage(0).getResources(); int i = 0; for (COSName csName : pdResources.getXObjectNames()) { // System.out.println(i+":"+csName); PDXObject pdxObject = pdResources.getXObject(csName); if (pdxObject instanceof PDImageXObject) { // i++; PDStream pdStream = pdxObject.getStream(); PDImageXObject image = new PDImageXObject(pdStream, pdResources); String imageSuffix = imageSuffix(image); // image storage location and image name BufferedImage bufferedImage = image.getImage(); ImageObject object = new ImageObject(); object.setIndex(i++); object.setImage(bufferedImage); object.setSuffix(imageSuffix); imageList.add(object); } } } finally { CloseUtils.closeQuietly(document, inputStream); } return imageList; } /** * 获取图片后缀 * * @param pdImage * @return * @throws IOException */ private static String imageSuffix(PDImageXObject pdImage) throws IOException { String suffix = pdImage.getSuffix(); if (suffix == null || "jb2".equals(suffix)) { suffix = "png"; } else if ("jpx".equals(suffix)) { // use jp2 suffix for file because jpx not known by windows suffix = "jp2"; } if (hasMasks(pdImage)) { // TIKA-3040, PDFBOX-4771: can't save ARGB as JPEG suffix = "png"; } return suffix; } private static boolean hasMasks(PDImage pdImage) throws IOException { if (pdImage instanceof PDImageXObject) { PDImageXObject ximg = (PDImageXObject) pdImage; return ximg.getMask() != null || ximg.getSoftMask() != null; } return false; } /** * 保存图片到指定文件夹 * * @param imageList * @param dir * @param prefixName * @throws IOException */ public static void saveImage(List<ImageObject> imageList, String dir, String prefixName) throws IOException { File imgDir = new File(dir); FileUtils.forceMkdir(imgDir); for(ImageObject image:imageList){ File imgFile = new File(dir, prefixName+"_"+image.getIndex()+"."+image.getSuffix()); ImageIO.write(image.getImage(), image.getSuffix(), imgFile); } } }

3、相关代码

CloseUtils

import java.io.Closeable; import java.util.zip.ZipInputStream; /** * 关闭文件流 */ public class CloseUtils { /** * 关闭文件流 * * @param closeables */ public static void closeQuietly(Closeable... closeables) { if (closeables != null && closeables.length > 0) { for (Closeable closeable : closeables) { if (closeable != null) { try { closeable.close(); } catch (Exception e) {} } } } } public static void closeEntryQuietly(ZipInputStream... closeables) { if (closeables != null && closeables.length > 0) { for (ZipInputStream closeable : closeables) { if (closeable != null) { try { closeable.closeEntry(); } catch (Exception e) { } } } } } }

StrUtils

import cn.hutool.core.util.StrUtil; import com.google.common.collect.Lists; import org.apache.commons.lang3.StringUtils; import java.util.Arrays; import java.util.List; import java.util.stream.Collectors; /** * */ public class StrUtils { /** * * @param text * @return */ public static List<String> lines(String text){ if(text == null || text.isEmpty()){ return null; } return Lists.newArrayList(text.split("\n+")); } /** * * @param text * @param lineIndex * @return */ public static String splitAt(String text, int lineIndex){ if(text == null || text.isEmpty()){ return null; } String[] lines = text.split("\\s+"); return lines.length > lineIndex ? lines[lineIndex] : null; } /** * 读取某行的数据 * * @param text * @param lineIndex 0 开始 * @return */ public static String lineAt(String text, int lineIndex){ if(text == null || text.isEmpty()){ return null; } String[] lines = text.split("\r?\n"); return lines.length > lineIndex ? lines[lineIndex] : null; } /** * * * @param text * @param startFlag 最后开始第一个 * @param closeFlag 最后开始第一个 * @return */ public static String substringBetween(String text, String startFlag, String closeFlag, String subType){ return substringBetween(text, startFlag, closeFlag, subType, null); } /** * * * @param text * @param startFlag 最后开始第一个 * @param closeFlag 最后开始第一个 * @return */ public static String substringBetween(String text, String startFlag, String closeFlag, String subType, String defaultVal){ if(StringUtils.isEmpty(text)){ return defaultVal; } if("substringBetween".equals(subType)){ if(StringUtils.isNotEmpty(startFlag) && StringUtils.isNotEmpty(closeFlag)){ return StrUtils.substringBetween(text, startFlag, closeFlag); } } else if("substringBetweenLast".equals(subType)){ if(StringUtils.isNotEmpty(startFlag) && StringUtils.isNotEmpty(closeFlag)){ return StrUtils.substringBetweenLast(text, startFlag, closeFlag); } } else if("substringBetweenLastBefore".equals(subType)){ if(StringUtils.isNotEmpty(startFlag) && StringUtils.isNotEmpty(closeFlag)){ return StrUtils.substringBetweenLastBefore(text, startFlag, closeFlag); } } else if("substringBetweenBeforeLast".equals(subType)){ if(StringUtils.isNotEmpty(startFlag) && StringUtils.isNotEmpty(closeFlag)){ return StrUtils.substringBetweenBeforeLast(text, startFlag, closeFlag); } } else if("substringAfter".equals(subType)){ if(StringUtils.isNotEmpty(startFlag)){ return StringUtils.substringAfter(text, startFlag); } } else if("substringAfterLast".equals(subType)){ if(StringUtils.isNotEmpty(startFlag)){ return StringUtils.substringAfterLast(text, startFlag); } } else if("substringBefore".equals(subType)){ if(StringUtils.isNotEmpty(closeFlag)){ return StringUtils.substringBefore(text, closeFlag); } } else if("substringBeforeLast".equals(subType)){ if(StringUtils.isNotEmpty(closeFlag)){ return StringUtils.substringBeforeLast(text, closeFlag); } } return defaultVal; } /** * * @param text * @param startFlag 前面开始第一个 * @param closeFlag 前面开始第一个 * @return */ public static String substringBetween(String text, String startFlag, String closeFlag){ if(text == null || text.isEmpty()){ return null; } int startIndex = text.indexOf(startFlag); int endIndex = text.indexOf(closeFlag); if(startIndex >= 0 && endIndex >= 0 && endIndex >= startIndex){ return text.substring(startIndex+startFlag.length(), endIndex); } return null; } public static String substringBetween(String text, String startFlag){ if(text == null || text.isEmpty()){ return null; } int startIndex = text.indexOf(startFlag); if(startIndex >= 0 && startIndex != -1){ return text.substring(startIndex + startFlag.length()); } return null; } /** * * * @param text * @param startFlag 最后开始第一个 * @param closeFlag 最后开始第一个 * @return */ public static String substringBetweenLast(String text, String startFlag, String closeFlag){ if(text == null || text.isEmpty()){ return null; } int startIndex = text.lastIndexOf(startFlag); int endIndex = text.lastIndexOf(closeFlag); if(startIndex >= 0 && endIndex >= 0 && endIndex >= startIndex){ return text.substring(startIndex+startFlag.length(), endIndex); } return null; } /** * * * @param text * @param startFlag 最后开始第一个 * @param closeFlag 前面开始第一个 * @return */ public static String substringBetweenLastBefore(String text, String startFlag, String closeFlag){ if(text == null || text.isEmpty()){ return null; } int startIndex = text.lastIndexOf(startFlag); int endIndex = text.indexOf(closeFlag); if(startIndex >= 0 && endIndex >= 0 && endIndex >= startIndex){ return text.substring(startIndex+startFlag.length(), endIndex); } return null; } /** * * @param text * @param startFlag 前面开始第一个 * @param closeFlag 最后开始第一个 * @return */ public static String substringBetweenBeforeLast(String text, String startFlag, String closeFlag){ if(text == null || text.isEmpty()){ return null; } int startIndex = text.indexOf(startFlag); int endIndex = text.lastIndexOf(closeFlag); if(startIndex >= 0 && endIndex >= 0 && endIndex >= startIndex){ return text.substring(startIndex+startFlag.length(), endIndex); } return null; } /** * Null转换成空 * * @param val * @return */ public static String nullToEmpty(String val){ return val == null ? "" : val; } /** * 删除回车键 * 回车Carriage Return * * @param val * @return */ public static String removeReturnChar(String val){ return val == null ? "" : val.replace("\r", ""); } public static String getLastNotNullText(String[] array){ List<String> collect = Arrays.stream(array).filter(x -> StrUtil.isNotBlank(x)).collect(Collectors.toList()); return collect.get(collect.size() - 1); } public static String getFirstNotNullText(String[] array){ List<String> collect = Arrays.stream(array).filter(x -> StrUtil.isNotBlank(x)).collect(Collectors.toList()); return collect.get(0); } }