富文本框上传pdf文件并预览

以百度编辑器ueditor为例

上传图片调用的action为 uploadimage 

在config.json中开放pdf的格式校验

然后在 BinaryUploader 中修改代码，判断如果是pdf文件，则调用pdf转图片的方法，把图片保存下来，然后返回相应地址

package test;



import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;



import javax.imageio.ImageIO;



import org.apache.pdfbox.pdmodel.PDDocument;

import org.apache.pdfbox.rendering.PDFRenderer;



import com.lowagie.text.pdf.PdfReader;



public class PDF2IMAGE {

    public static void main(String[] args) {

        pdf2Image("D:/1.pdf", "D:/pdf", 300);

    }



    /***
     * PDF文件转PNG图片，全部页数
     *
     * @param PdfFilePath pdf完整路径
     * @param imgFilePath 图片存放的文件夹
     * @param dpi dpi越大转换后越清晰，相对转换速度越慢
     * @return
     */

    public static void pdf2Image(String PdfFilePath, String dstImgFolder, int dpi) {

        File file = new File(PdfFilePath);

        PDDocument pdDocument;

        try {

            String imgPDFPath = file.getParent();

            int dot = file.getName().lastIndexOf('.');

            String imagePDFName = file.getName().substring(0, dot); // 获取图片文件名

            String imgFolderPath = null;

            if (dstImgFolder.equals("")) {

                imgFolderPath = imgPDFPath + File.separator + imagePDFName;// 获取图片存放的文件夹路径

            } else {

                imgFolderPath = dstImgFolder + File.separator + imagePDFName;

            }



            if (createDirectory(imgFolderPath)) {



                pdDocument = PDDocument.load(file);

                PDFRenderer renderer = new PDFRenderer(pdDocument);

                /* dpi越大转换后越清晰，相对转换速度越慢 */

                PdfReader reader = new PdfReader(PdfFilePath);

                int pages = reader.getNumberOfPages();

                StringBuffer imgFilePath = null;

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

                    String imgFilePathPrefix = imgFolderPath + File.separator + imagePDFName;

                    imgFilePath = new StringBuffer();

                    imgFilePath.append(imgFilePathPrefix);

                    imgFilePath.append("_");

                    imgFilePath.append(String.valueOf(i + 1));

                    imgFilePath.append(".png");

                    File dstFile = new File(imgFilePath.toString());

                    BufferedImage image = renderer.renderImageWithDPI(i, dpi);

                    ImageIO.write(image, "png", dstFile);

                }

                System.out.println("PDF文档转PNG图片成功！");



            } else {

                System.out.println("PDF文档转PNG图片失败：" + "创建" + imgFolderPath + "失败");

            }



        } catch (IOException e) {

            e.printStackTrace();

        }

    }



    private static boolean createDirectory(String folder) {

        File dir = new File(folder);

        if (dir.exists()) {

            return true;

        } else {

            return dir.mkdirs();

        }

    }



}