java 解析PDF

用java读取PDF，这里用到了itext，jar包可以自己上网下载：

 

	public static void readPDF(String path) throws Exception {
		try {

			PdfReader reader = new PdfReader(path);
			int n = reader.getNumberOfPages();
			System.out.println("page number = " + n);
			String str = PdfTextExtractor.getTextFromPage(reader, n); // Extracting
			System.out.println(str);
		} catch (Exception e) {
			System.out.println(e);
		}
	}

用java写入PDF：

 

	public static void writePDF(String path) {
		Document d = new Document();
		try {
			FileOutputStream os = new FileOutputStream(path);
			PdfWriter.getInstance(d, os);
			d.open();
			d.add(new Paragraph("hello PDF"));
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally {
			d.close();
		}
	}

 往PDF中插入图片，图片格式不一样，插入方法略有不同：

 

	public static void writeImageToPDFWithPNG(String filePath, String imagePath) {

		try {
			// Create Document Object
			Document convertPngToPdf = new Document();
			// Create PdfWriter for Document to hold physical file
			// Change the PDF file path to suit to your needs
			PdfWriter.getInstance(convertPngToPdf, new FileOutputStream(
					filePath));
			convertPngToPdf.open();
			// Get the PNG image to Convert to PDF
			// getImage of PngImage class is a static method
			// Edit the file location to suit to your needs
			Image convertBmp = PngImage.getImage(imagePath);
			// Add image to Document
			convertPngToPdf.add(convertBmp);
			// Close Document
			convertPngToPdf.close();
			System.out
					.println("Converted and stamped PNG Image in a PDF Document Using iText and Java");
		} catch (Exception i1) {
			i1.printStackTrace();
		}
	}

	public static void writeIamgeToPDFWithBMP(String filePath, String imagePath) {
		try {
			// Create Document Object
			Document convertBmpToPdf = new Document();
			// Create PdfWriter for Document to hold physical file
			PdfWriter.getInstance(convertBmpToPdf, new FileOutputStream(
					filePath));
			convertBmpToPdf.open();
			// Get the Bitmap image to Convert to PDF
			// getImage is a static method, does not require object
			Image convertBmp = BmpImage.getImage(imagePath);
			// Add image to Document
			convertBmpToPdf.add(convertBmp);
			// Close Document
			convertBmpToPdf.close();
			System.out.println("Successfully Converted BMP to PDF in iText");
		} catch (Exception i1) {
			i1.printStackTrace();
		}
	}

	public static void writeIamgeToPDFWithJEPG(String filePath, String imagePath) {
		Document doc = new Document();
		Image jpeg;
		try {
			PdfWriter.getInstance(doc, new FileOutputStream(filePath));
			doc.open();
			jpeg = Image.getInstance(imagePath);
			// 图片居中
			jpeg.setAlignment(Image.ALIGN_CENTER);
			doc.add(jpeg);
			doc.close();
			System.out.println("Successfully Converted JPEG to PDF in iText");
		} catch (Exception e) {
			e.printStackTrace();
		}
	}