java 操作com.itextpdf.text.pdf.PdfPTable问题记录

需求： 生成的 pdf 要插入图片信息

1、插入图片的大小 是由单元格的高度决定，跟图片本身大小无关

	/**
	 * @param image
	 * @param align_v  垂直 ALIGN_LEFT = 0;  ALIGN_CENTER = 1;ALIGN_RIGHT = 2; ALIGN_TOP = 4;ALIGN_MIDDLE = 5;ALIGN_BOTTOM = 6;
	 * @param align_h  水平 ALIGN_LEFT = 0 ALIGN_CENTER = 1;  ALIGN_RIGHT = 2;
	 * @param colspan  跨列
	 * @param rowspan  跨行
	 * @return
	 */
	public PdfPCell createCellNotBorder(BufferedImage bufferedImage, int align, int colspan, int rowspan) throws BadElementException, IOException {
		
		Image image = Image.getInstance(bufferedImage, null);
		image.setAlignment(Image.MIDDLE);
		    
		PdfPCell cell = new PdfPCell();
		cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
		cell.setHorizontalAlignment(align);
		if (colspan !=0) {
			cell.setColspan(colspan);
		}
		if (rowspan !=0) {
			cell.setRowspan(rowspan);
		}

		cell.setBorder(0);
		int height = (int) Math.ceil(bufferedImage.getHeight());
		// 设置单元格高度
		cell.setFixedHeight(height);
		cell.setImage(image);

		return cell;
	}

 

2、 pdf 跨列 问题

正常单元格

com.itextpdf.text.pdf.PdfPTable


//  示例：
PdfPTable table = createTable(new float[] { 50,50});

table.addCell(createCellNotBorder(" 第一个单元格 ", textfont_H, 1));
table.addCell(createCellNotBorder(" 第二个单元格 ", textfont_H, 1));
table.addCell(createCellNotBorder(" 第三个单元格 ", textfont_H, 1));
table.addCell(createCellNotBorder(" 第四个单元格 ", textfont_H, 1));


 



	/**
	 * 无边框
	 * @param value
	 * @param font
	 * @param align  水平  ALIGN_LEFT = 0 ALIGN_CENTER = 1;  ALIGN_RIGHT = 2;
	 * @return
	 */
	public static PdfPCell createCellNotBorder(String value, Font font, int align) {
		PdfPCell cell = new PdfPCell();
		cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
		cell.setHorizontalAlignment(align);
		cell.setPhrase(new Phrase(value, font));
//		cell.setPaddingTop(6.0F);
		 cell.setBorder(0);
		return cell;
	}

 跨列示例

        PdfPTable table = createTable(new float[] { 50,50});

		table.addCell(createCellNotBorder("第一个单元格", textfont_H, 1));
		// 跨一列
		table.addCell(createCellNotBorder("第二个单元格", title1Font, Element.ALIGN_MIDDLE, Element.ALIGN_CENTER , 1, 0));
		table.addCell(createCellNotBorder("第三个单元格 ", textfont_H, 1));

 


	/**
	 * 无边框
	 * @param value
	 * @param font
	 * @param align  水平  ALIGN_LEFT = 0 ALIGN_CENTER = 1;  ALIGN_RIGHT = 2;
	 * @return
	 */
	public static PdfPCell createCellNotBorder(String value, Font font, int align) {
		PdfPCell cell = new PdfPCell();
		cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
		cell.setHorizontalAlignment(align);
		cell.setPhrase(new Phrase(value, font));
//		cell.setPaddingTop(6.0F);
		 cell.setBorder(0);
		return cell;
	}



	/**
	 * 无边框
	 * @param value
	 * @param font
	 * @param align_v  垂直  ALIGN_LEFT = 0;  ALIGN_CENTER = 1;ALIGN_RIGHT = 2; ALIGN_TOP = 4;ALIGN_MIDDLE = 5;ALIGN_BOTTOM = 6;
	 * @param align_h  水平  ALIGN_LEFT = 0 ALIGN_CENTER = 1;  ALIGN_RIGHT = 2;
	 * @param colspan  跨列
	 * @param rowspan  跨行
	 * @return
	 */
	public static PdfPCell createCellNotBorder(String value, Font font, int align_v,int align_h, int colspan, int rowspan) {
		PdfPCell cell = new PdfPCell();
		cell.setVerticalAlignment(align_v);
		cell.setHorizontalAlignment(align_h);
		if (colspan !=0) {
			cell.setColspan(colspan);
		}
		if (rowspan !=0) {
			cell.setRowspan(rowspan);
		}
		cell.setPhrase(new Phrase(value, font));
		cell.setBorder(0);
		return cell;
	}

3、 图片文件流如何转 com.itextpdf.text.Image对象

生成二维码如下：

	public  BufferedImage creatCode(String contents, int width, int height) {
		BufferedImage image = null;
		Hashtable hints = new Hashtable<>();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");  //设置字符编码
        hints.put(EncodeHintType.MARGIN, 1);    //二维码空白区域,最小为0也有白边,只是很小,最小是6像素左右
        try {
            BitMatrix bitMatrix = new MultiFormatWriter().encode(contents, BarcodeFormat.QR_CODE, width, height, hints); // 1、读取文件转换为字节数组
            image = MatrixToImageWriter.toBufferedImage(bitMatrix);
            //转换成png格式的IO流

        } catch (Exception e) {
        	e.printStackTrace();
        }
        return image;
    }
 

        BufferedImage 转 com.itextpdf.text.Image

public PdfPCell createCellNotBorder(BufferedImage bufferedImage, int align, int colspan, int rowspan) throws BadElementException, IOException {
		
		Image image = Image.getInstance(bufferedImage, null);
		image.setAlignment(Image.MIDDLE);
		    
		PdfPCell cell = new PdfPCell();
		cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
		cell.setHorizontalAlignment(align);
		if (colspan !=0) {
			cell.setColspan(colspan);
		}
		if (rowspan !=0) {
			cell.setRowspan(rowspan);
		}

		cell.setBorder(0);
		int height = (int) Math.ceil(bufferedImage.getHeight());
		// 设置单元格高度
		cell.setFixedHeight(height);
		cell.setImage(image);

		return cell;
	}