使用iTextPDF与PDFBox提取PDF文件指定页的纯文字

<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itextpdf</artifactId>
<version>5.5.10</version>
</dependency>
<dependency>
<groupId>com.itextpdf.tool</groupId>
<artifactId>xmlworker</artifactId>
<version>5.5.9</version>
</dependency>
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itext-asian</artifactId>
<version>5.2.0</version>
</dependency>
<dependency>
<groupId>org.apache.pdfbox</groupId>
<artifactId>pdfbox</artifactId>
<version>1.8.10</version>
</dependency>

public static String getFiles(String outPath, String fileName, String filePath, int num) {
try {
File file = new File(filePath);
InputStream in = new FileInputStream(file);
// 获取文件后缀名，将其作为文件类型
String fileType = fileName.substring(fileName.lastIndexOf(".") + 1,
fileName.length()).toLowerCase();
if (fileType != null && !fileType.equals("")) {
if (fileType.equals("pdf")) {
// 获取pdf文档
PDFParser parser = new PDFParser(in);
parser.parse();
PDDocument pdDocument = parser.getPDDocument();
PDFTextStripper stripper = new PDFTextStripper();
//设置是否排序
stripper.setSortByPosition(true);
//设置起始页
stripper.setStartPage(num);
//设置结束页
stripper.setEndPage(num);
String content = stripper.getText(pdDocument);
Document document = new Document();
PdfWriter.getInstance(document, new FileOutputStream(outPath));
document.open();
BaseFont bfChinese = BaseFont.createFont("STSongStd-Light", "UniGB-UCS2-H", false);
Font fontChinese = new Font(bfChinese, 12, Font.NORMAL, BaseColor.BLACK);
//建段落
Paragraph paragraph = new Paragraph();
paragraph.setFont(fontChinese);
//                    paragraph.add(paragraph); //加这一句 会报错  递归太深 报栈错误
paragraph.add(content);
//设置段落对齐方式
paragraph.setAlignment(Element.ALIGN_LEFT);
//设置缩进
paragraph.setIndentationLeft(100f);
//注意增加段落时会自动换行
document.add(paragraph);
document.close();
// 关闭文档
pdDocument.close();
return outPath;
}
}
} catch (DocumentException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}

导包：

import com.itextpdf.text.*;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfWriter;
import org.apache.pdfbox.exceptions.COSVisitorException;
import org.apache.pdfbox.pdfparser.PDFParser;
import org.apache.pdfbox.pdmodel.PDDocument;