itext 生成pdf文档

package com.tool.itext;

import java.io.FileOutputStream;

import com.itextpdf.text.BaseColor;
import com.itextpdf.text.Document;
import com.itextpdf.text.Element;
import com.itextpdf.text.Font;
import com.itextpdf.text.Image;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfPTable;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;
import com.itextpdf.text.pdf.PdfWriter;

public class PdfUtil {
	// 表头
	public static final String[] tableHeader = { "出借人(id)", "借款金额", "借款期限",
			"年利率", "借款开始日", "借款到期日", "截止还款日", "还款本息" };

	// 数据表字段数
	private static final int colNumber = 8;

	// 表格的设置
	private static final int spacing = 1;

	// 表格的设置
	private static final int padding = 1;

	public static void main(String[] args) {
		// 创建文Pdf文挡50, 50, 50,50左右上下距离
		Document document = new Document(PageSize.A4);
		try {
			// 使用PDFWriter进行写文件操作
			PdfWriter.getInstance(document,
					new FileOutputStream("d:\\学生信息.pdf"));
			document.open();
			// 中文字体
			BaseFont bfChinese = BaseFont.createFont("STSong-Light",
					"UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
			Font fontChinese = new Font(bfChinese, 12, Font.BOLD);
			// 创建有colNumber(8)列的表格
			PdfPTable datatable = new PdfPTable(colNumber);
			// 定义表格的宽度
			int[] cellsWidth = { 5, 4, 4, 4, 5, 5, 5, 5 };
			datatable.setWidths(cellsWidth);
			// 表格的宽度百分比
			datatable.setWidthPercentage(100);
			datatable.getDefaultCell().setPadding(padding);
			datatable.getDefaultCell().setBorderWidth(spacing);
			// 设置表格的底色
			datatable.getDefaultCell().setBackgroundColor(BaseColor.WHITE);
			datatable.getDefaultCell().setHorizontalAlignment(
					Element.ALIGN_CENTER);
			// 添加表头元素
			for (int i = 0; i < colNumber; i++) {
				datatable.addCell(new Paragraph(tableHeader[i], fontChinese));
			}
			// 添加子元素
			for (int i = 0; i < colNumber; i++) {
				datatable.addCell(new Paragraph(tableHeader[i], fontChinese));
			}
			Paragraph pf = new Paragraph("借款协议", fontChinese);
			pf.setAlignment(Element.ALIGN_CENTER);
			pf.setSpacingAfter(10f);
			document.add(pf);
			pf = new Paragraph(
					"借款协议号:389     借款人:lianhuan515     出借人:详见本协议第一条\n签订日期:2013-05-20 \n借款人通过成如下协议: \n第一条:详情如下表所示: ",
					fontChinese);
			pf.setSpacingAfter(20f);
			document.add(pf);
			document.add(datatable);
			pf = new Paragraph(
					"第二条:还款 \n", fontChinese);
			document.add(pf);
			document.close();
			PdfReader reader = new PdfReader("d:\\学生信息.pdf", "PassWord".getBytes());// 选择需要印章的pdf
			PdfStamper stamp = new PdfStamper(reader, new FileOutputStream(
					"d:\\学生信息1.pdf"));// 加完印章后的pdf
			PdfContentByte over = stamp.getOverContent(1);// 设置在第几页打印印章
			Image image = Image
					.getInstance("D:\\workspace\\old\\WebContent\\images\\zhang.jpg");// 选择透明图片
			image.setAlignment(1);
			image.scaleAbsolute(220, 220);// 控制图片大小
			image.setAbsolutePosition(200, 500);// 控制图片位置
			over.addImage(image);
			stamp.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	

	}
}
	@RequestMapping(value = "/fileDownload/pdf/{id}.do", method = RequestMethod.GET)
	public void pdfDownload(HttpServletRequest request,
			HttpServletResponse response, @PathVariable Long id) {
		/** 获得输出流 **/
		OutputStream outputStream = null;
		InputStream in = null;
		try {
			/** 文件名,可以从数据库中取 **/
			String fileName = id + ".pdf";

			/** 获得输入流 **/
			in = new BufferedInputStream(request
					.getSession()
					.getServletContext()
					.getResourceAsStream(
							Constants.FILEPATH + File.separator + fileName));

			/** 存放文件的字节数组,available()返回字节数 **/
			byte[] buffer = new byte[in.available()];

			/** 从流中将文件读取到字节数组中 **/
			in.read(buffer);

			/** 转换编码 **/
			fileName = URLEncoder.encode(fileName, "UTF-8");

			/** 重置response **/
			response.reset();

			/** 设置HTML头部信息 **/
			response.setHeader("Content-Disposition", "attachment; filename=\""
					+ fileName + "\"");
			response.addHeader("Content-Length", "" + buffer.length);
			response.setContentType("application/octet-stream;charset=UTF-8");

			outputStream = new BufferedOutputStream(response.getOutputStream());

			/** 从字节数组中将文件写到输出流中 **/
			outputStream.write(buffer);

			/** 清空输出流 **/
			outputStream.flush();

			/*** 关闭输入流 */

		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally {
			try {
				in.close();
				outputStream.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}

		}
	}


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