JFreeChart几则实例之itext生成PDF篇

项目要求，没办法，生成的jsp页面要打印。
于是要生成pdf大概查了一下itext主站的实例如下 ：

/**/ /*
 * $Id: JFreeChartExample.java 1778 2005-06-02 11:05:39Z blowagie $
 * $Name$
 *
 * This code is part of the 'iText Tutorial'.
 * You can find the complete tutorial at the following address:
 * http://itextdocs.lowagie.com/tutorial/
 *
 * This code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * itext-questions@lists.sourceforge.net
 */
package  com.lowagie.examples.directcontent.graphics2D;

import  java.awt.Graphics2D;
import  java.awt.geom.Rectangle2D;
import  java.io.FileNotFoundException;
import  java.io.FileOutputStream;

import  org.jfree.chart.ChartFactory;
import  org.jfree.chart.JFreeChart;
import  org.jfree.chart.plot.PlotOrientation;
import  org.jfree.data.category.DefaultCategoryDataset;
import  org.jfree.data.general.DefaultPieDataset;
import  org.jfree.data.xy.XYSeries;
import  org.jfree.data.xy.XYSeriesCollection;

import  com.lowagie.text.Document;
import  com.lowagie.text.DocumentException;
import  com.lowagie.text.Rectangle;
import  com.lowagie.text.pdf.DefaultFontMapper;
import  com.lowagie.text.pdf.PdfContentByte;
import  com.lowagie.text.pdf.PdfTemplate;
import  com.lowagie.text.pdf.PdfWriter;

/** */ /**
 * JFreeChart example.
 */
public   class  JFreeChartExample  ... {
    
    /** *//**
     * Creates some PDFs with JFreeCharts.
     * @param args no arguments needed
     */
    public static void main(String[] args) ...{
        System.out.println("JFreeChart example");
        /** *//** the following line is a workaround for JDK 1.5 (fix by Adriaan Joubert) */
        org.jfree.text.TextUtilities.setUseDrawRotatedStringWorkaround(false);
        convertToPdf(getBarChart(), 400, 600, "barchart.pdf");
        convertToPdf(getPieChart(), 400, 600, "piechart.pdf");
        convertToPdf(getXYChart(), 400, 600, "xychart.pdf");
    }
    
    /** *//**
     * Converts a JFreeChart to PDF syntax.
     * @param filename    the name of the PDF file
     * @param chart        the JFreeChart
     * @param width        the width of the resulting PDF
     * @param height    the height of the resulting PDF
     */
    public static void convertToPdf(JFreeChart chart, int width, int height, String filename) ...{
        // step 1
        Document document = new Document(new Rectangle(width, height));
        try ...{
            // step 2
            PdfWriter writer;
            writer = PdfWriter.getInstance(document, new FileOutputStream(filename));
            // step 3
            document.open();
            // step 4
            PdfContentByte cb = writer.getDirectContent();
            PdfTemplate tp = cb.createTemplate(width, height);
            Graphics2D g2d = tp.createGraphics(width, height, new DefaultFontMapper());
            Rectangle2D r2d = new Rectangle2D.Double(0, 0, width, height);
            chart.draw(g2d, r2d);
            g2d.dispose();
            cb.addTemplate(tp, 0, 0);
        }
        catch(DocumentException de) ...{
            de.printStackTrace();
        }
        catch (FileNotFoundException e) ...{
            e.printStackTrace();
        }
        // step 5
        document.close();
    }
    
    /** *//**
     * Gets an example barchart.
     * @return a barchart
     */
    public static JFreeChart getBarChart() ...{
        DefaultCategoryDataset dataset = new DefaultCategoryDataset();
        dataset.setValue(40, "hits/hour", "index.html");
        dataset.setValue(20, "hits/hour", "download.html");
        dataset.setValue(15, "hits/hour", "faq.html");
        dataset.setValue(8, "hits/hour", "links.html");
        dataset.setValue(31, "hits/hour", "docs.html");
        return ChartFactory.createBarChart("Popularity of iText pages",
                "Page", "hits/hour", dataset,
                PlotOrientation.VERTICAL, false, true, false);
    }
    
    /** *//**
     * Gets an example piechart.
     * @return a piechart
     */
    public static JFreeChart getPieChart() ...{
        DefaultPieDataset dataset = new DefaultPieDataset();
        dataset.setValue("iText", 60);
        dataset.setValue("cinema.lowagie.com", 10);
        dataset.setValue("tutorial", 30);
        return ChartFactory.createPieChart(
                "Website popularity",
                dataset,
                true,
                true,
                false);
    }
    
    /** *//**
     * Gets an example XY chart
     * @return an XY chart
     */
    public static JFreeChart getXYChart() ...{
        XYSeries series = new XYSeries("XYGraph");
        series.add(1, 5);
        series.add(2, 7);
        series.add(3, 3);
        series.add(4, 5);
        series.add(5, 4);
        series.add(6, 5);
        XYSeriesCollection dataset = new XYSeriesCollection();
        dataset.addSeries(series);
        return ChartFactory.createXYLineChart(
                "XY Chart", "X-axis", "Y-axis", dataset,
                PlotOrientation.VERTICAL, true, true, false);
    }
}

不过这里遇到了一些问题。一个是日文显示的问题。一个是分页后图片坐标的处理：
生成Chart 之前的一个blog有记载。直接copy。生成了之后关键是如何把它加载在pdf文件里。

        Map tempmap  =   new  HashMap();
        tempmap.put( " _LocaleUtil " ,  new  LocaleUtil(Locale.JAPANESE));
        MessageUtil mu  =
             new  MessageUtil(
                tempmap,
                 " jp.co.uss.cares100.message.bill.CaresRcdWeekPdf " );
         //  ｐｄｆマージン　取得
         int  marginleft  =  Integer.parseInt(mu.get( " marginleft " ));
         int  marginright  =  Integer.parseInt(mu.get( " marginright " ));
         int  margintop  =  Integer.parseInt(mu.get( " margintop " ));
         int  marginbottom  =  Integer.parseInt(mu.get( " marginbottom " ));
        String pageSize  =  mu.get( " pageSize " );

        SimpleDateFormat df  =   new  SimpleDateFormat( " yyyyMMddHHmmss " );
         //  厳密な日付判定
        df.setLenient( false );
        String now  =  df.format( new  Date());
        String fileName  =  PDF_FILE_PREFIX  +  now  +   " .pdf " ;
        DateFormat dateFormat  =
            DateFormat.getDateTimeInstance(
                DateFormat.MEDIUM,
                DateFormat.MEDIUM,
                Locale.JAPAN);
        res.reset();
        res.setContentType( " application/pdf " );
        res.setHeader(
             " Content-Disposition " ,
             " inline; filename=" "   +  fileName  +   " " " );
        res.setHeader( " Cache-Control " ,  "" );
        res.setHeader( " Pragma " ,  "" );
        BufferedOutputStream bufOutStream  =
             new  BufferedOutputStream(res.getOutputStream());
        Document document;
         //  ページサイズを設定する
         if  (pageSize.equalsIgnoreCase( " A4 " ))  ... {
            document =
                new Document(
                    PageSize.A4,
                    marginleft,
                    marginright,
                    margintop,
                    marginbottom);
            // ページサイズを設定する            
        }   else   ... {
            document =
                new Document(
                    PageSize.A3,
                    marginleft,
                    marginright,
                    margintop,
                    marginbottom);
        }
        PdfWriter pdfwriter  =  PdfWriter.getInstance(document, bufOutStream);
         //  ドキュメントオープン 
        document.open();
         // 加载一个封面
        document.add(CaresRecordDayPdfProcess.getFaceTable(req,document,(List)map.get( " baseInfoList " )));
        document.newPage();
         // 加载头信息
        document.add(
            getHeadTable(
                map.get( " userName " ).toString(),
                map.get( " baseInfo " ).toString(),
                map.get( " dateInfo " ).toString()));
        document.add(getPhrase( " ● 介護記録 " ));
         // 加载数据table
        document.add(
            getDataTable(
                (List) map.get( " title1List " ),
                (List) map.get( " data1List " )));
         // compute the height of the chart
         int  height  =   405 , dataCount  =   0 ; // 调节chart图片的显示Y坐标
        dataCount  =  ((List) map.get( " data1List " )).size();
        height  =  height  -  dataCount  *   20 ; // table的row高度，每加一row那么图片坐标就要低20
         while ( true ) ... {//分页后应该显示的Y坐标，A4纸的高度是800
            if(height < 0)...{
                height += 40*20;
            }else...{
                if(height > 500)...{
                    document.newPage();
                    height = 510;
                }
                height -= 10;
                break;
            }
        }
        document.add(getPhrase( " ● バイタル " ));
        PdfContentByte cb  =  pdfwriter.getDirectContent();
        PdfTemplate tp  =  cb.createTemplate( 500 ,  300 );
         // 这里很重要，解决了东方语言显示的问题。
        Graphics2D g2d  =
            tp.createGraphics(
                 500 ,
                 300 ,
                 new  AsianFontMapper(
                    AsianFontMapper.JapaneseFont_Min,
                    AsianFontMapper.JapaneseEncoding_H));
        Rectangle2D r2d  =   new  Rectangle2D.Double( 0 ,  0 ,  500 ,  300 );
        JFreeChart chart  =  getChart(map);
        chart.draw(g2d, r2d);
        g2d.dispose();
        cb.addTemplate(tp,  48 , height);
         //  ドキュメントクローズ
        document.close();
        bufOutStream.flush();
        bufOutStream.close();

关键是以下几段代码：
a)生成pdf

     public   static   void  convertToPdf(JFreeChart chart,  int  width,  int  height, String filename)  ... {
        // step 1
        Document document = new Document(new Rectangle(width, height));
        try ...{
            // step 2
            PdfWriter writer;
            writer = PdfWriter.getInstance(document, new FileOutputStream(filename));
            // step 3
            document.open();
            // step 4
            PdfContentByte cb = writer.getDirectContent();
            PdfTemplate tp = cb.createTemplate(width, height);
            Graphics2D g2d = tp.createGraphics(width, height, new DefaultFontMapper());
            Rectangle2D r2d = new Rectangle2D.Double(0, 0, width, height);
            chart.draw(g2d, r2d);
            g2d.dispose();
            cb.addTemplate(tp, 0, 0);
        }
        catch(DocumentException de) ...{
            de.printStackTrace();
        }
        catch (FileNotFoundException e) ...{
            e.printStackTrace();
        }
        // step 5
        document.close();
    }

b)汉语，日语和其他东方语言的支持：

        PdfContentByte cb  =  pdfwriter.getDirectContent();
        PdfTemplate tp  =  cb.createTemplate( 500 ,  300 );
        Graphics2D g2d  = // 关键部分
            tp.createGraphics(
                 500 ,
                 300 ,
                 new  AsianFontMapper(
                    AsianFontMapper.JapaneseFont_Min,
                    AsianFontMapper.JapaneseEncoding_H));
        Rectangle2D r2d  =   new  Rectangle2D.Double( 0 ,  0 ,  500 ,  300 );
        JFreeChart chart  =  getChart(map);
        chart.draw(g2d, r2d);
        g2d.dispose();
        cb.addTemplate(tp,  48 , height);

需要加载的包是iTextAsian.jar
夏在地址： http://sourceforge.net/project/downloading.php?groupname=itextpdf&filename=iTextAsian.jar&use_mirror=nchc