iText导出PDF经典实现

package org.leno.export.util;

 

import java.io.UnsupportedEncodingException;

 

public class StrHelp {

 

   public static String getChinese(String s) {

      try {

         return new String(s.getBytes("gb2312"), "iso-8859-1");

      } catch (UnsupportedEncodingException e) {

         return s;

      }

   }

}

 

package org.leno.export.util;

 

import java.io.IOException;

 

import com.lowagie.text.*;

import com.lowagie.text.pdf.BaseFont;

 

public class PdfParagraph extends Paragraph {

 

   private static final long serialVersionUID = -244970043180837974L;

 

   public PdfParagraph(String content) {

      super(content, getChineseFont(12, false));

   }

 

   public PdfParagraph(String content, int fontSize, boolean isBold) {

      super(content, getChineseFont(fontSize, isBold));

   }

 

   // 设置字体-返回中文字体

   protected static Font getChineseFont(int nfontsize, boolean isBold) {

      BaseFont bfChinese;

      Font fontChinese = null;

      try {

         bfChinese = BaseFont.createFont("c://windows//fonts//simsun.ttc,1",

                BaseFont.IDENTITY_H, BaseFont.EMBEDDED);

         if (isBold) {

            fontChinese = new Font(bfChinese, nfontsize, Font.BOLD);

         } else {

            fontChinese = new Font(bfChinese, nfontsize, Font.NORMAL);

         }

      } catch (DocumentException e) {

         // TODO Auto-generated catch block

         e.printStackTrace();

      } catch (IOException e) {

         // TODO Auto-generated catch block

         e.printStackTrace();

      }

      return fontChinese;

   }

 

   // 转化中文

   protected Cell ChangeCell(String str, int nfontsize, boolean isBold)

         throws IOException, BadElementException, DocumentException {

      Phrase ph = ChangeChinese(str, nfontsize, isBold);

      Cell cell = new Cell(ph);

      // cell.setBorderWidth(3);

 

      return cell;

   }

 

   // 转化中文

   protected Chunk ChangeChunk(String str, int nfontsize, boolean isBold)

         throws IOException, BadElementException, DocumentException {

      Font FontChinese = getChineseFont(nfontsize, isBold);

      Chunk chunk = new Chunk(str, FontChinese);

      return chunk;

   }

 

   // 转化中文

   protected Phrase ChangeChinese(String str, int nfontsize, boolean isBold)

         throws IOException, BadElementException, DocumentException {

      Font FontChinese = getChineseFont(nfontsize, isBold);

      Phrase ph = new Phrase(str, FontChinese);

      return ph;

   }

 

}

 

以上是两个帮助封装类,都是为了对付iText的中文问题的。下面就是主角出场:

package org.leno.export.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xxxget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 {

         // 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 = "";

                      if (!bValue) {

                         textValue = "";

                      }

                   } 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, truenew Date()));

      dataset.add(new Student(20000002, "李四", 24, falsenew Date()));

      dataset.add(new Student(30000003, "王五", 22, truenew 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();

      }

   }

}

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