如何解析pdf中带颜色部分

二话部署先上图
问如何解析pdf中红色部分内容？

1. 尝试tika，失败。tika只能解析到pdf中的文字，无法定位红色部分。
2. 尝试pdfpox，依然失败，没有找到能够定位的api。
3. 同事给出的思路能不能转成html然后在解析。

bingo
这一思路可行
引入maven依赖

<dependency>
    <groupId>net.sf.cssboxgroupId>
    <artifactId>pdf2domartifactId>
    <version>1.7version>
dependency>
<dependency>
    <groupId>org.apache.pdfboxgroupId>
    <artifactId>pdfboxartifactId>
    <version>2.0.12version>
dependency>
<dependency>
    <groupId>org.apache.pdfboxgroupId>
    <artifactId>pdfbox-toolsartifactId>
    <version>2.0.12version>
dependency>

import com.laibo.reduce.reduce_center.common.exception.GeneralException;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.fit.pdfdom.PDFDomTree;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import org.springframework.stereotype.Component;

import java.io.*;
import java.util.HashMap;
import java.util.Map;
@Component
public class PdfToHtmlUtil {
    public static final String PDF_SUFFIX = ".pdf";
    public static final String HTML_SUFFIX = ".html";

	public static void main(String[] args) {
        String path = "C:\\Users\\laibo\\Desktop\\temp\\test.pdf";
        pdfToHtml(path);
    }

    /**
     * 将指定路径的pdf转成Html
     * @param path 文件路径
     */
    public static void pdfToHtml(String path) {
        if (path == null || path.length() == 0) {
            throw new GeneralException("path为空！");
        }
        if (!path.endsWith(PDF_SUFFIX)) {
            throw new GeneralException("文件类型不是pdf，请检查文件类型！");
        }
        int endIndex = path.indexOf(PDF_SUFFIX);
        String pathPrefixWithFileName = path.substring(0, endIndex);
        String outputPath = pathPrefixWithFileName + HTML_SUFFIX;
        byte[] bytes = getBytes(path);
        pdfBytesToHtml(bytes,outputPath);
    }

    /**
     * 将pdf的字节数组转成html
     * @param bytes 字节数组
     * @param outputPath html输出路径
     */
    public static void pdfBytesToHtml(byte[] bytes,String outputPath){
        /**
         * try() 写在()里面会自动关闭流
         */
        try (BufferedWriter out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(new File(outputPath)), "UTF-8"));) {
            /**
             * 加载PDF文档
             */
            PDDocument document = PDDocument.load(bytes);
            PDFDomTree pdfDomTree = new PDFDomTree();
            pdfDomTree.writeText(document, out);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 将文件转换为byte数组
     * @param filePath
     * @return byte[]
     */
    private static byte[] getBytes(String filePath) {
        byte[] buffer = null;
        try {
            File file = new File(filePath);
            FileInputStream fis = new FileInputStream(file);
            ByteArrayOutputStream bos = new ByteArrayOutputStream(1000);
            byte[] b = new byte[1000];
            int n;
            while ((n = fis.read(b)) != -1) {
                bos.write(b, 0, n);
            }
            fis.close();
            bos.close();
            buffer = bos.toByteArray();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return buffer;
    }
}

生成html完成

再使用jsoup解析即可