java如何将pdf转换成image

本文实例为大家分享了java将pdf转换image的具体代码，供大家参考，具体内容如下

首先使用了使用了apache的pdfbox组件1.8.4版本

									package pdf; 

									import java.awt.image.bufferedimage; 

									import java.io.file; 

									import java.io.ioexception; 

									import java.util.date; 

									import java.util.list; 

									import javax.imageio.imageio; 

									import org.apache.pdfbox.pdmodel.pddocument; 

									import org.apache.pdfbox.pdmodel.pdpage; 

									public class pdfbox { 

									  @suppresswarnings("rawtypes") 

									  public static void main(string[] args) throws ioexception { 

									    string p=system.getproperty("user.dir") + "/"+"zk.pdf";   

									    pddocument doc = pddocument.load(p); 

									    int pagecount = doc.getnumberofpages(); 

									    system.out.println(pagecount); 

									    date start = new date(); 

									    try { 

									      list pages = doc.getdocumentcatalog().getallpages(); 

									      for(int i=0;i<pages.size();i++){ 

									        pdpage page = (pdpage) pages.get(i); 

									        @suppresswarnings("unused") 

									        int width = new float(page.gettrimbox().getwidth()).intvalue(); 

									        @suppresswarnings("unused") 

									        int height = new float(page.gettrimbox().getheight()).intvalue(); 

									        bufferedimage image = page.converttoimage(); 

									        imageio.write(image, "jpg", new file("img" + file.separator + (i + 1) + ".jpg")); 

									        system.out.println("image in the page -->"+(i+1)); 

									      } 

									    } catch (exception e) { 

									      e.printstacktrace(); 

									    }finally{ 

									      if(doc != null){ 

									        doc.close(); 

									      } 

									    } 

									    date end = new date(); 

									    system.out.println(end.gettime()-start.gettime()); 

									    system.out.println("over"); 

									  } 

									}

但是其问题在于问题：

当pdf文档为180m大小时直接报解析异常

当pdf页数为500多页时处理非常慢

其后尝试使用了pdf-renderer 1.0.5 版本

									package pdf; 

									import java.awt.image; 

									import java.awt.rectangle; 

									import java.awt.image.bufferedimage; 

									import java.io.file; 

									import java.io.fileoutputstream; 

									import java.io.ioexception; 

									import java.io.randomaccessfile; 

									import java.nio.mappedbytebuffer; 

									import java.nio.channels.filechannel; 

									import com.sun.image.codec.jpeg.jpegcodec; 

									import com.sun.image.codec.jpeg.jpegencodeparam; 

									import com.sun.image.codec.jpeg.jpegimageencoder; 

									import com.sun.pdfview.pdffile; 

									import com.sun.pdfview.pdfpage; 

									public class pdfrenderer { 

									  public static void main(string[] args) throws ioexception{ 

									    string pdfrealepath=system.getproperty("user.dir") + "/"+"zk.pdf"; 

									    file file = new file(pdfrealepath); 

									    randomaccessfile raf = new randomaccessfile(file, "r"); 

									    filechannel channel = raf.getchannel(); 

									    mappedbytebuffer buf = channel.map(filechannel.mapmode.read_only, 

									        0, channel.size()); 

									    pdffile pdffile = new pdffile(buf); 

									    for (int i = 1; i <= pdffile.getnumpages(); i++) { 

									      pdfpage page = pdffile.getpage(i); 

									      rectangle rect = new rectangle(0, 0, ((int) page.getbbox() 

									          .getwidth()), ((int) page.getbbox().getheight())); 

									      image img = page.getimage(rect.width, rect.height, rect, null,true,true); 

									      bufferedimage tag = new bufferedimage(rect.width, rect.height, 

									          bufferedimage.type_int_rgb); 

									      tag.getgraphics().drawimage(img, 0, 0, rect.width, rect.height,null); 

									      fileoutputstream out = new fileoutputstream("img" + file.separator + (i + 1) + ".jpg"); // 输出到文件流 

									      jpegimageencoder encoder = jpegcodec.createjpegencoder(out); 

									      jpegencodeparam param2 = encoder.getdefaultjpegencodeparam(tag); 

									      param2.setquality(1f, false);// 1f是提高生成的图片质量 

									      encoder.setjpegencodeparam(param2); 

									      encoder.encode(tag); // jpeg编码 

									      out.close(); 

									      system.out.println("image in the page -->"+(i+1)); 

									    } 

									  } 

									}