java解析pdf
毋修为
最近遇到需求解析pdf，具体需求为解析处pdf文件中的标题，内容，图片，表格等信息，并分类存储。查遍某度也没有找到方法，问了https://www.e-iceblue.cn/的技术，也做不到。无奈只能按页提取到文本和图片了，而且顺序也是错乱的。代码如下，希望能对类似需求的小伙伴有所帮助。 不过虽然pdf没搞定，但是搞定了word（doc、docx）的解析，后续会更新出来与大家分享。当然如果有小伙伴解决了pdf的解析还请多多指教 需要依赖：
<dependency>
<groupId>org.apache.pdfbox</groupId>
<artifactId>pdfbox</artifactId>
<version>2.0.24</version>
</dependency>
<repository>
<id>com.e-iceblue</id>
<name>e-iceblue</name>
<url>http://repo.e-iceblue.cn/repository/maven-public/</url>
</repository>
测试代码如下：
package com.aiwrite.file.utils.pdf;
import com.aiwrite.common.core.constant.FileConstants;
import com.aiwrite.file.utils.FileUploadUtils;
import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;
import com.spire.pdf.exporting.PdfImageInfo;
import com.spire.pdf.widget.PdfPageCollection;
import org.apache.commons.lang3.ObjectUtils;
import org.apache.pdfbox.io.RandomAccessFile;
import org.apache.pdfbox.pdfparser.PDFParser;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.text.PDFTextStripper;
import javax.imageio.ImageIO;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
/**
* @BelongsProject: aiwrite
* @BelongsPackage: com.aiwrite.file.utils
* @Author: zhousc
* @CreateTime: 2022-06-12 17:31
* @Description: TODO
* @Version: 1.0
*/
public class ParsePdfUtilTest {
public static void main(String[] args) {
String basePath = "E:\\123\\";
String pdfPath = basePath + "认证授权开发手册.pdf";
/* =================================================================================== */
System.out.println(" ==================== pdf parse begin !!! ==================== ");
long l = System.currentTimeMillis();
try {
// testPdf(pdfPath, basePath);
printPdfInfo(pdfPath);
// readPDF(pdfPath);
} catch (Exception e) {
e.printStackTrace();
}
long l1 = System.currentTimeMillis();
System.out.println(" ==================== pdf parse success !!! 共耗时 " + (l1 -l) + " ms ==================== ");
/* =================================================================================== */
}
public static void printPdfInfo(String filePath) throws Exception {
//加载测试文档
PdfDocument pdf = new PdfDocument();
pdf.loadFromFile(filePath);
// 按每页获取文件内容
PdfPageCollection pages = pdf.getPages();
// pdf每页对象
PdfPageBase page;
if (pages.getCount() > 0) {
for (int i = 0; i < pages.getCount(); i++) {
page = pages.get(i);
System.out.println(" >>>>> >>>>> >>>>> >>>>> >>>>> 第 " + (i + 1) + " 页 <<<<< <<<<< <<<<< <<<<< <<<<< ");
System.out.println(" ***** ***** ***** ***** ***** 内容如下 ***** ***** ***** ***** ***** ");
// 按原内容格式输出
String text = page.extractText(true);
System.out.println(text.replace("Evaluation Warning : The document was created with Spire.PDF for Java.",""));
// 判断是否有图片
PdfImageInfo[] imagesInfo = page.getImagesInfo();
for (PdfImageInfo pdfImageInfo : imagesInfo) {
Rectangle2D bounds = pdfImageInfo.getBounds();
int index = pdfImageInfo.getIndex();
String base64 = FileUploadUtils.BufferedImageToBase64(pdfImageInfo.getImage());
System.out.println(" ===== ===== ===== ===== ===== 图片坐标信息如下 ===== ===== ===== ===== ===== ");
System.out.println(" index: " + index + "; x: " +bounds.getX() + "; y: " + bounds.getY());
// System.out.println(" base64: " + base64);
}
// BufferedImage[] bufferedImages = page.extractImages(true);
// if (ObjectUtils.isNotEmpty(bufferedImages)) {
// for (BufferedImage bufferedImage : bufferedImages) {
// System.out.println(" ===== ===== ===== ===== ===== 图片信息如下 ===== ===== ===== ===== ===== ");
// System.out.println(bufferedImage);
// }
// }
}
}
pdf.close();
}
public static void testPdf(String filePath, String outPath) throws IOException {
//加载测试文档,实例化StringBuilder类
PdfDocument pdf = new PdfDocument(filePath);
//定义一个int型变量
StringBuilder sb = new StringBuilder();
//遍历PDF文档中每页
int index = 0;
PdfPageBase page;
for (int i = 0; i < pdf.getPages().getCount(); i++) {
page = pdf.getPages().get(i);
//调用extractText()方法提取文本
sb.append(page.extractText(true));
FileWriter writer;
try {
//将StringBuilder对象中的文本写入到txt
writer = new FileWriter(outPath + "ExtractText.txt");
writer.write(sb.toString());
writer.flush();
} catch (IOException e) {
e.printStackTrace();
}
//调用extractImages方法获取图片
if (ObjectUtils.isNotEmpty(page.extractImages())) {
//指定输出图片名，指定图片格式
for (BufferedImage image : page.extractImages()) {
File output = new File(String.format(outPath + "Image_%d.png", index++));
ImageIO.write(image, FileConstants.PICTURE_PNG, output);
}
}
}
pdf.close();
}
/**
* 读PDF文件，使用了pdfbox开源项目
* @param fileName
*/
public static void readPDF(String fileName) {
File file = new File(fileName);
FileInputStream in = null;
try {
in = new FileInputStream(fileName);
// 新建一个PDF解析器对象
PDFParser parser = new PDFParser(new RandomAccessFile(file,"rw"));
// 对PDF文件进行解析
parser.parse();
// 获取解析后得到的PDF文档对象
PDDocument pdfdocument = parser.getPDDocument();
// 新建一个PDF文本剥离器
PDFTextStripper stripper = new PDFTextStripper();
//sort设置为true 则按照行进行读取，默认是false
stripper .setSortByPosition(true);
// 从PDF文档对象中剥离文本
String result = stripper.getText(pdfdocument);
// 写入到文件
// FileWriter fileWriter = new FileWriter(new File("pdf.txt"));
// fileWriter.write(result);
// fileWriter.flush();
// fileWriter.close();
System.out.println("PDF文件的文本内容如下：");
System.out.println(result);
} catch (Exception e) {
System.out.println("读取PDF文件" + file.getAbsolutePath() + "生失败！" + e);
e.printStackTrace();
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e1) {
}
}
}
}
}
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