Java pdf和jpg互转案例

Java pdf和jpg互转案例

pdfbox: jpg转pdf：

/**

* 使用pdfbox将jpg转成pdf

* @param jpgStream jpg输入流

* @param pdfPath pdf文件存储路径

* @throws IOException IOException

*/

public static void jpgToPdf(InputStream jpgStream, String pdfPath) throws IOException {

PDDocument pdDocument = new PDDocument();

BufferedImage image = ImageIO.read(jpgStream);

PDPage pdPage = new PDPage(new PDRectangle(image.getWidth(), image.getHeight()));

pdDocument.addPage(pdPage);

PDImageXObject pdImageXObject = LosslessFactory.createFromImage(pdDocument, image);

PDPageContentStream contentSfLaTyObtream = new PDPageContentStream(pdDocument, pdPage);

contentStream.drawImage(pdImageXObject, 0, 0, image.getWidth(), image.getHeight());

contentStream.close();

pdDocument.save(pdfPath);

pdDocument.close();

}

pdfbox: pdf转jpg：

static void pdfbox() throws IOException {

long start = System.currentTimeMillis();

//pdf路径

URL url = new URL("file:///D:/1.pdf");

InputStream stream = URLUtil.getStream(url);

// 加载解析PDF文件

PDDocument doc = PDDocument.load(stream);

PDFRenderer pdfRenderer = new PDFRenderer(doc);

PDPageTree pages = doc.getPages();

int pageCount = pages.getCount();

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

BufferedImage bim = pdfRenderer.renderImageWithDPI(i, 200);

ByteArrayOutputStream os = new ByteArrayOutputStream();

ImageIO.write(bim, "jpg", os);

byte[] datas = os.toByteArray();

// InputStream is = new ByteArrayInputStream(datas);

//jpg文件转出路径

FileUtil.writeBytes(datas, new File("d:/jpg/" + i + ".jpg"));

}

long end = System.currentTimeMillis();

long time = (end - start) / 1000;

System.out.println(StrUtil.format("pdf转jpg耗时： {}s", time));

}

icepdf: pdf转jpg

Document document = new Document();

document.setUrl(new URL(pdfUrl));

int pageNum = document.getNumberOfPages();

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

// 目前仅支持1对1的pdf->jpg

if (i != 0) {

continue;

}

// 3、pdf -> jpg

BufferedImage bim = (BufferedImage) document.getPageImage(i,

GraphicsRenderingHints.SCREEN, Page.BOUNDARY_CROPBOX,

rotation, scale);

os = new ByteArrayOutputStream();

ImageIO.write(bim, "jpg", os);

// 4、jpg -> fdfs

byte[] datas = os.toByteArray();

InputStream is = new ByteArrayInputStream(datas);

补充知识：java实现对png图片文件电子签名操作

我就废话不多说了，大家还是直接看代码吧~

/**

* 根据图片像素位置添加用户电子签名

* @param imagePath 要操作的图片路径

* @param signImagePath 电子签名图片路径

* @param outImagePath 合成后输出图片路径

* @param width 像素位宽度

* @param height 像素位高度

*/

public static void syntheticPicture(String imagePath, String signImagePath,Integer width,Integer height, String outImagePath ) {

try {

BufferedImage big = ImageIO.read(new File(imagePath));

BufferedImage small = ImageIO.read(new File(signImagePath));

Graphics2D g = big.createGraphics();

//根据图片像素位置粘贴带电子签名

g.drawImage(small, width, height, small.getWidth(), small.getHeight(), null);

g.dispose();

ImageIO.write(big, outImagePath .split("\\.")[1], new File(outImagePath ));

} catch (Exception e) {

throw new RuntimeException(e);

}

}

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