java实现截取PDF指定页并进行图片格式转换功能

1、引入依赖

<dependency>
  <groupid>org.apache.pdfbox</groupid>
  <artifactid>pdfbox</artifactid>
  <version>2.0.16</version>
</dependency>
<dependency>
  <groupid>org.apache.pdfbox</groupid>
  <artifactid>fontbox</artifactid>
  <version>2.0.16</version>
</dependency>

jar包下载地址：

2、实现demo

package com.dddpeter.app;
import org.apache.pdfbox.multipdf.splitter;
import org.apache.pdfbox.pdmodel.pddocument;
import org.apache.pdfbox.rendering.pdfrenderer;
import javax.imageio.imageio;
import javax.imageio.stream.imageoutputstream;
import java.awt.image.bufferedimage;
import java.io.*;
import java.util.list;
import java.util.listiterator;
public class pdfutils {
  public static string splitpdf(int pagenum, string source, string dest) {
    file indexfile = new file(source);
    file outfile = new file(dest);
    pddocument document = null;
    try {
      document = pddocument.load(indexfile);
      // document.getnumberofpages();
      splitter splitter = new splitter();
      splitter.setstartpage(pagenum);
      splitter.setendpage(pagenum);
      list<pddocument> pages = splitter.split(document);
      listiterator<pddocument> iterator = pages.listiterator();
      while (iterator.hasnext()) {
        pddocument pd = iterator.next();
        if (outfile.exists()) {
          outfile.delete();
        }
        pd.save(outfile);
        pd.close();
        if (outfile.exists()) {
          return outfile.getpath();
        }
      }
      document.close();
    } catch (ioexception e) {
      e.printstacktrace();
    } catch (exception e) {
      e.printstacktrace();
    }
    return null;
  }
  public static void pdffiletoimage(file pdffile,string targetpath){
    try {
      fileinputstream instream = new fileinputstream(pdffile);
      inputstream byteinputstream=null;
      try {
        pddocument doc = pddocument.load(instream);
        pdfrenderer renderer = new pdfrenderer(doc);
        int pagecount = doc.getnumberofpages();
        if (pagecount > 0) {
          bufferedimage image = renderer.renderimage(0, 4.0f);
          image.flush();
          bytearrayoutputstream bs = new bytearrayoutputstream();
          imageoutputstream imout;
          imout = imageio.createimageoutputstream(bs);
          imageio.write(image, "png", imout);
          byteinputstream = new bytearrayinputstream(bs.tobytearray());
          byteinputstream.close();
        }
        doc.close();
      }
      catch (ioexception e) {
        e.printstacktrace();
      }
      file uploadfile = new file(targetpath);
      fileoutputstream fops;
      fops = new fileoutputstream(uploadfile);
      fops.write(readinputstream(byteinputstream));
      fops.flush();
      fops.close();
    }
    catch (exception e) {
      e.printstacktrace();
    }
  }
  public static byte[] readinputstream(inputstream instream) throws exception {
    bytearrayoutputstream outstream = new bytearrayoutputstream();
    byte[] buffer = new byte[1024];
    int len = 0;
    while ((len = instream.read(buffer)) != -1) {
      outstream.write(buffer, 0, len);
    }
    instream.close();
    return outstream.tobytearray();
  }
  public static void main(string[] args) {
    string path = splitpdf(4,"d:\\data\\11.pdf","d:\\data\\out11.pdf");
    file file =new file(path);
    //上传的是png格式的图片结尾
    string targetfile="d:\\data\\out11.png";
    pdffiletoimage(file,targetfile);
  }
}

总结

以上所述是小编给大家介绍的java实现截取pdf指定页并进行图片格式转换功能,希望对大家有所帮助