使用itext生成PDF文件

package com.text.exportpdf;

import java.io.*;
import java.lang.reflect.*;
import java.util.*;

import java.io.*;
import java.lang.reflect.*;
import java.util.*;
import com.lowagie.text.*;
import com.lowagie.text.pdf.*;
import java.awt.Color;
import javax.swing.JOptionPane;
import java.net.MalformedURLException;
import java.text.SimpleDateFormat;


/**
 * 利用开源组件IText2.0.7动态导出PDF文档 转载时请保留以下信息，注明出处！
 * 
 * @author leno
 * @version v1.0
 * @param <T>
 *            应用泛型，代表任意一个符合javabean风格的类
 *            注意这里为了简单起见，boolean型的属性xxx的get器方式为getXxx(),而不是isXxx()
 *            byte[]表图片数据,注意合适的大小
 */
public class ExportPdf<T> {
   public void exportPdf(Collection<T> dataset, OutputStream out) {
      exportPdf("测试iText导出PDF文档", null, dataset, out, "yyyy-MM-dd");
   }
 

   public void exportPdf(String[] headers, Collection<T> dataset,
         OutputStream out) {
      exportPdf("测试iText导出PDF文档", headers, dataset, out, "yyyy-MM-dd");
   }
 

   public void exportPdf(String[] headers, Collection<T> dataset,
         OutputStream out, String pattern) {
      exportPdf("测试iText导出PDF文档", headers, dataset, out, pattern);
   }
 

   /**
    * 这是一个通用的方法，利用了JAVA的反射机制，可以将放置在JAVA集合中并且符号一定条件的数据以PDF 的形式输出到指定IO设备上
    * 
    * @param title
    *            表格标题名
    * @param headers
    *            表格属性列名数组
    * @param dataset
    *            需要显示的数据集合,集合中一定要放置符合javabean风格的类的对象。此方法支持的
    *            javabean属性的数据类型有基本数据类型及String,Date,byte[](图片数据)
    * @param out
    *            与输出设备关联的流对象，可以将PDF文档导出到本地文件或者网络中
    * @param pattern
    *            如果有时间数据，设定输出格式。默认为"yyy-MM-dd"
    */
   @SuppressWarnings("unchecked")
   public void exportPdf(String title, String[] headers,
         Collection<T> dataset, OutputStream out, String pattern) {
      // 作为报表的PDF文件，一定要适合打印机的输出打印
      Rectangle rectPageSize = new Rectangle(PageSize.A4);// 定义A4页面大小
      rectPageSize = rectPageSize.rotate();// 加上这句可以实现A4页面的横置
      Document document = new Document(rectPageSize, 50, 50, 50, 50);// 其余4个参数，设置了页面的4个边距
      try {
         // 将PDF文档写出到out所关联IO设备上的书写对象
         PdfWriter.getInstance(document, out);
         // 添加文档元数据信息
         document.addTitle(StrHelp.getChinese(title));
         document.addSubject("export information");
         document.addAuthor("leno");
         document.addCreator("leno");
         document.addKeywords("pdf itext");
         // 定义页头和页尾
         HeaderFooter header = new HeaderFooter(new PdfParagraph(title, 20,
                true), false);
         header.setAlignment(Element.ALIGN_CENTER);
         HeaderFooter footer = new HeaderFooter(new Phrase(
                "This   is   page   "), new Phrase("."));
         footer.setAlignment(Element.ALIGN_CENTER);
         document.setHeader(header);
         document.setFooter(footer);
         // 打开PDF文档
         document.open();
         // 添加一张表格，使用Table或者PdfPTable
         // Table table = new Table(headers.length);
         // table.setWidth(16*headers.length);
         // //table.setWidths(new float[]{20,20,20,30});
         // table.setCellsFitPage(true);
         // table.setAutoFillEmptyCells(true);
         // table.setAlignment(Table.ALIGN_CENTER);
         // table.setBackgroundColor(Color.yellow);
         // table.setBorderColor(Color.green);
         PdfPTable table = new PdfPTable(headers.length);
         // table.setHorizontalAlignment(Element.ALIGN_CENTER);
         table.setWidthPercentage(16 * headers.length);
         // 产生表格标题行
         for (int i = 0; i < headers.length; i++) {
            PdfPCell cell = new PdfPCell(new PdfParagraph(headers[i], 14,
                   true));
            cell.setHorizontalAlignment(Cell.ALIGN_CENTER);
            cell.setVerticalAlignment(Cell.ALIGN_MIDDLE);
            cell.setBackgroundColor(Color.cyan);
            cell.setBorderColor(Color.green);
            table.addCell(cell);
         }
         // 遍历集合数据，产生数据行
         Iterator<T> it = dataset.iterator();
         int index = 0;
         while (it.hasNext()) {
            index++;
            T t = (T) it.next();
            // 利用反射，根据javabean属性的先后顺序，动态调用getXxx()方法得到属性值
            Field[] fields = t.getClass().getDeclaredFields();
            for (short i = 0; i < fields.length; i++) {
                PdfPCell cell = null;
                Field field = fields[i];
                String fieldName = field.getName();
                String getMethodName = "get"
                      + fieldName.substring(0, 1).toUpperCase()
                      + fieldName.substring(1);
                try {
                   Class tCls = t.getClass();
                   Method getMethod = tCls.getMethod(getMethodName,
                         new Class[] {});
                   Object value = getMethod.invoke(t, new Object[] {});
                   // 判断值的类型后进行强制类型转换
                   String textValue = null;
                   if (value instanceof Boolean) {
                      boolean bValue = (Boolean) value;
                      textValue = "男";
                      if (!bValue) {
                         textValue = "女";
                      }
                   } else if (value instanceof Date) {
                      Date date = (Date) value;
                      SimpleDateFormat sdf = new SimpleDateFormat(pattern);
                      textValue = sdf.format(date);
                   } else if (value instanceof byte[]) {
                      byte[] bsValue = (byte[]) value;
                      Image img = Image.getInstance(bsValue);
                      cell = new PdfPCell(img);
                   } else {
                      textValue = value.toString();
                   }
                   // 如果不是图片数据,就当做文本处理
                   if (textValue != null) {
                      cell = new PdfPCell(new PdfParagraph(textValue));
                   }
                   cell.setHorizontalAlignment(Cell.ALIGN_CENTER);
                   cell.setVerticalAlignment(Cell.ALIGN_MIDDLE);
                   cell.setBorderColor(Color.green);
                   table.addCell(cell);
                } catch (SecurityException e) {
                   // TODO Auto-generated catch block
                   e.printStackTrace();
                } catch (NoSuchMethodException e) {
                   // TODO Auto-generated catch block
                   e.printStackTrace();
                } catch (IllegalArgumentException e) {
                   // TODO Auto-generated catch block
                   e.printStackTrace();
                } catch (IllegalAccessException e) {
                   // TODO Auto-generated catch block
                   e.printStackTrace();
                } catch (InvocationTargetException e) {
                   // TODO Auto-generated catch block
                   e.printStackTrace();
                } catch (MalformedURLException e) {
                   // TODO Auto-generated catch block
                   e.printStackTrace();
                } catch (IOException e) {
                   // TODO Auto-generated catch block
                   e.printStackTrace();
                } finally {
                   // 清理资源
                }
            }
 

         }
         document.add(table);
         document.close();
 

      } catch (DocumentException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
      }
   }
 

   public static void main(String[] args) {
      // 测试学生
      ExportPdf<Student> ex = new ExportPdf<Student>();
      String[] headers = { "学号", "姓名", "年龄", "性别", "出生日期" };
      java.util.List<Student> dataset = new ArrayList<Student>();
      dataset.add(new Student(10000001, "张三", 20, true, new Date()));
      dataset.add(new Student(20000002, "李四", 24, false, new Date()));
      dataset.add(new Student(30000003, "王五", 22, true, new Date()));
      // 测试图书
      ExportPdf<Book> ex2 = new ExportPdf<Book>();
      String[] headers2 = { "图书编号", "图书名称", "图书作者", "图书价格", "图书ISBN",
            "图书出版社", "封面图片" };
      java.util.List<Book> dataset2 = new ArrayList<Book>();
      try {
         BufferedInputStream bis = new BufferedInputStream(
                new FileInputStream("book.jpg"));
         byte[] buf = new byte[bis.available()];
         while ((bis.read(buf)) != -1) {
         }
         dataset2.add(new Book(1, "jsp", "leno", 300.33f, "1234567",
                "清华出版社", buf));
         dataset2.add(new Book(2, "java编程思想", "brucl", 300.33f, "1234567",
                "阳光出版社", buf));
         dataset2.add(new Book(3, "DOM艺术", "lenotang", 300.33f, "1234567",
                "清华出版社", buf));
         dataset2.add(new Book(4, "c++经典", "leno", 400.33f, "1234567",
                "清华出版社", buf));
         dataset2.add(new Book(5, "c#入门", "leno", 300.33f, "1234567",
                "汤春秀出版社", buf));
 

         OutputStream out = new FileOutputStream("E://a.pdf");
         OutputStream out2 = new FileOutputStream("E://b.pdf");
         ex.exportPdf(headers, dataset, out);
         ex2.exportPdf(headers2, dataset2, out2);
         out.close();
         out2.close();
         JOptionPane.showMessageDialog(null, "pdf导出成功!");
         System.out.println("pdf导出成功！");
      } catch (FileNotFoundException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
      } catch (IOException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
      }
   }
}