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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原文链接：https://blog.csdn.net/tanzhming/article/details/117930788

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