PDF转换图片，图片的切割，图片转换PDF以及PDF加水印等记录贴

PDF转变为图片；

把图片进行切割；

把图片转变回PDF；

为PDF加水印文字；

为PDF加水印图片。
1，PDF转变为图片

/*** @author dalin*将PDF格式的文件转换成png文件*/ public class PdfToPNG {public static void main(String[] args) {String filePath = "D:\\pdf\\2.pdf";Document document = new Document();document.setFile(filePath);float scale = 2.5f;//缩放比例float rotation = 0f;//旋转角度for (int i = 0; i < document.getNumberOfPages(); i++) {BufferedImage image = (BufferedImage)document.getPageImage(i, GraphicsRenderingHints.SCREEN, org.icepdf.core.pobjects.Page.BOUNDARY_CROPBOX, rotation, scale);RenderedImage rendImage = image;try {File file = new File("D:\\img\\" + i + ".png"); ImageIO.write(rendImage, "png", file); } catch (IOException e) {e.printStackTrace();}image.flush();}document.dispose();} }

2，图片切割

/*** @author dalin*分割png文件，这里做截取png文件部分*/ public class FenGePNG {private static void splitImage() throws IOException { String originalImg = "D:\\img\\0.png"; // 读入大图 File file = new File(originalImg); FileInputStream fis = new FileInputStream(file); BufferedImage image = ImageIO.read(fis); // 分割成4*4(16)个小图 int rows = 2; int cols = 1; int chunks = rows * cols; // 计算每个小图的宽度和高度 int chunkWidth = image.getWidth() / cols; int chunkHeight = image.getHeight() / rows; int count = 0; BufferedImage imgs[] = new BufferedImage[chunks]; for (int x = 0; x < rows; x++) { for (int y = 0; y < cols; y++) { //设置小图的大小和类型 imgs[count] = new BufferedImage(chunkWidth, chunkHeight, image.getType()); //写入图像内容 Graphics2D gr = imgs[count++].createGraphics(); gr.drawImage(image, 0, 0, chunkWidth, chunkHeight, chunkWidth* y, chunkHeight * x, chunkWidth * y + chunkWidth, chunkHeight * x + chunkHeight, null); gr.dispose(); } } // 输出小图 for (int i = 0; i < imgs.length; i++) { ImageIO.write(imgs[i], "jpg", new File("D:\\img\\" + "img"+i + ".jpg")); } System.out.println("完成分割！"); } public static void main(String[] args) {try {splitImage();} catch (IOException e) {e.printStackTrace();}} }

3，图片转变为PDF

/*** @author dalin * png文件类型转为PDF类型*/ public class PNGToPdf {private static void jpgToPdf(File pdfFile,File imgFile) throws Exception { //文件转img InputStream is = new FileInputStream(pdfFile); ByteArrayOutputStream baos = new ByteArrayOutputStream(); for(int i;(i=is.read())!=-1;) { baos.write(i); } baos.flush(); //取得图像的宽和高。 Image img = Image.getInstance(baos.toByteArray()); float width = img.width(); float height = img.height(); img.setAbsolutePosition(0.0F, 0.0F);//取消偏移 System.out.println("width = "+width+"\theight"+height); //img转pdf Document doc = new Document(new Rectangle(width,height)); PdfWriter pw = PdfWriter.getInstance(doc,new FileOutputStream(imgFile)); doc.open(); doc.add(img); //释放资源 System.out.println(doc.newPage()); pw.flush(); baos.close(); doc.close(); pw.close(); } public static void main(String[] args) {try {jpgToPdf(new File("D:\\img\\0.png"),new File("D:\\pdf\\2new.pdf"));} catch (Exception e) {e.printStackTrace();} } }

4，为PDF加文字水印和图片水印

public class Test {public static void main(String[] args) throws DocumentException, IOException {// 要输出的pdf文件BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(new File("D:\\pdf\\water6.pdf")));setWatermark(bos, "D:\\pdf\\2.pdf", 16);}public static void setWatermark(BufferedOutputStream bos, String input, int permission)throws DocumentException, IOException {Rectangle pageRect = null;PdfReader reader = new PdfReader(input);PdfStamper stamper = new PdfStamper(reader, bos);int total = reader.getNumberOfPages() + 1;PdfContentByte content;Image image = Image.getInstance("D:/pdf/1.jpg");BaseFont base = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.EMBEDDED);PdfGState gs = new PdfGState();for (int i = 1; i < total; i++) {pageRect = stamper.getReader().getPageSizeWithRotation(i);// 计算水印X,Y坐标// float x = pageRect.getWidth() / 1;float y = pageRect.getHeight() / 1;System.out.println("这张PDF长是：" + y);// content = stamper.getOverContent(i);// 在内容上方加水印content = stamper.getUnderContent(i);// 在内容下方加水印gs.setFillOpacity(0.2f);// content.setGState(gs);content.beginText();content.setColorFill(Color.LIGHT_GRAY);content.setFontAndSize(base, 25);// content.setTextMatrix(500,500);image.setAbsolutePosition(100, 200);image.setRotationDegrees(30);content.showTextAligned(Element.ALIGN_LEFT, "XXXX防伪标志", 250, 200, 55);image.scaleToFit(200, 200);content.addImage(image);content.setColorFill(Color.BLACK);content.setFontAndSize(base, 8);content.endText();}stamper.close();} }

总结

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