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引入maven依赖
<!-- poi -->
<dependency><groupId>org.apache.poi</groupId><artifactId>poi</artifactId><version>3.16</version>
</dependency>
<dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>3.16</version>
</dependency>
<dependency><groupId>org.apache.poi</groupId><artifactId>poi-scratchpad</artifactId><version>3.16</version>
</dependency><!-- pdf -->
<dependency><groupId>org.apache.pdfbox</groupId><artifactId>pdfbox</artifactId><version>2.0.4</version>
</dependency>提取内容
private static String read(File file) {StringBuilder builder = new StringBuilder();String name = file.getName();boolean txt = name.endsWith(".txt");if (txt) {try (FileInputStream inputStream = new FileInputStream(file)) {int len;byte[] bytes = new byte[1024];while ((len = inputStream.read(bytes)) != -1) {builder.append(new String(bytes, 0, len));}inputStream.close();} catch (IOException e) {e.printStackTrace();}}POITextExtractor extractor = null;boolean word = name.endsWith(".doc") || name.endsWith(".docx");if (word) {try {extractor = new WordExtractor(new HWPFDocument(new FileInputStream(file)));} catch (Exception e) {try {extractor = new XWPFWordExtractor(new XWPFDocument(new FileInputStream(file)));} catch (Exception ignored) {}}}boolean excel = name.endsWith(".xls") || name.endsWith(".xlsx");if (excel) {try {extractor = new ExcelExtractor(new HSSFWorkbook(new POIFSFileSystem(file)));} catch (Exception e) {try {extractor = new XSSFExcelExtractor(new XSSFWorkbook(file));} catch (Exception ignored) {}}}boolean slide = name.endsWith(".ppt") || name.endsWith(".pptx");if (slide) {try {extractor = new PowerPointExtractor(new FileInputStream(file));} catch (Exception e) {try {extractor = new XSLFPowerPointExtractor(new XSLFSlideShow(OPCPackage.open(file)));} catch (Exception ignored) {}}}if (extractor != null) {builder.append(extractor.getText());try {extractor.close();} catch (IOException ignored) {}}boolean pdf = name.endsWith(".pdf");if (pdf) {try {PDDocument document = PDDocument.load(file);PDFTextStripper stripper = new PDFTextStripper();builder.append(stripper.getText(document));document.close();} catch (IOException e) {e.printStackTrace();}}return builder.toString();
}
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