Java实现pdf转图片案例

工程加入依赖：

<dependency>
			<groupid>org.apache.pdfbox</groupid>
			<artifactid>pdfbox</artifactid>
			<version>2.0.15</version>
		</dependency>
		<dependency>
			<groupid>org.apache.pdfbox</groupid>
			<artifactid>pdfbox-tools</artifactid>
			<version>2.0.15</version>
		</dependency>

pdf文件转图片：

    public static list<string> pdf2img(file pdffile) {
        if (pdffile == null || !pdffile.exists()) {
            throw new runtimeexception("pdf文件不能为空");
        }
        string name = pdffile.getname().substring(0, pdffile.getname().lastindexof("."));
        string targetpath = pdffile.getparent() + file.separator + name;
        list<string> imglist = new arraylist<>();
        try {
            pddocument doc = pddocument.load(pdffile);
            // 页数
            int pagecount = doc.getnumberofpages();
            pdfrenderer pdfrenderer = new pdfrenderer(doc);
            for (int i = 0; i < pagecount; i++) {
                file targetfile = new file(targetpath + file.separator + name + "-" + (i + 1) + ".jpg");
                if (!targetfile.getparentfile().exists()) {
                    fileutil.mkdir(targetfile.getparentfile());
                }
                pdfrenderer.renderimage(i);
                bufferedimage image = pdfrenderer.renderimagewithdpi(i, 105, imagetype.rgb);
                imageioutil.writeimage(image, targetfile.getpath(), 105);
                imglist.add(targetfile.getpath());
            }
        } catch (ioexception e) {
            log.error("文件转换异常", e);
            throw new runtimeexception("文件转换异常，err=" + e.getmessage());
        }

pdf转成一张图片：

    /**
     * pdf转成一张图片
     *
     * @param pdffile pdf图片文件
     * @return 图片地址
     */
    public static string pdf2oneimg(file pdffile) {

        list<string> imgs = pdf2img(pdffile);
        int len = imgs.size();
        file[] src = new file[len];
        bufferedimage[] images = new bufferedimage[len];
        int[][] imagearrays = new int[len][];
        for (int i = 0; i < len; i++) {
            try {
                src[i] = new file(imgs.get(i));
                if (!src[i].exists()) {
                    throw new runtimeexception("文件【" + imgs.get(i) + "】不存在");
                }
                images[i] = imageio.read(src[i]);
            } catch (exception e) {
                log.error("", e);
                throw new runtimeexception(e);
            }
            int width = images[i].getwidth();
            int height = images[i].getheight();
            // 从图片中读取rgb 像素
            imagearrays[i] = new int[width * height];
            imagearrays[i] = images[i].getrgb(0, 0, width, height, imagearrays[i], 0, width);
        }

        int dst_height = 0;
        int dst_width = images[0].getwidth();
        // 合成图片像素
        for (int i = 0; i < images.length; i++) {
            dst_width = dst_width > images[i].getwidth() ? dst_width : images[i].getwidth();
            dst_height += images[i].getheight();
        }
        if (dst_height < 1) {
            throw new runtimeexception("文件合成失败，合成后的图片文件高度=" + dst_height);
        }
        string name = pdffile.getname().substring(0, pdffile.getname().lastindexof("."));
        string targetpath = pdffile.getparent() + file.separator + name;
        // 输出路径
        file outfile = new file(targetpath + file.separator + name + "-bigone.jpg");
        // 生成新图片
        try {
            dst_width = images[0].getwidth();
            bufferedimage imagenew = new bufferedimage(dst_width, dst_height, bufferedimage.type_int_rgb);
            int height_i = 0;
            for (int i = 0; i < images.length; i++) {
                imagenew.setrgb(0, height_i, dst_width, images[i].getheight(), imagearrays[i], 0, dst_width);
                height_i += images[i].getheight();
            }
            imageio.write(imagenew, "jpg", outfile);
        } catch (exception e) {
            log.error("图片合并异常=", e);
            throw new runtimeexception(e);
        }
        return outfile.getpath();
    }

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