在Web上用iText和JFreeChart将图形报表导出到PDF

最近项目中需要一个将生成的图形报表导出到PDF文件的功能。在图形上面本打算采用Flash进行展示，可是没有找到怎样直接将Flash导入PDF的方法，应该只有先生成图片才可以吧？（知道怎样做的大侠可以给个方法，先谢了。）于是改用JFreeChart来画图。生成PDF方面工具也很多，iText还比较成熟，于是选用它来生成PDF。

一开始本想图个省事，直接将网页转换成PDF文件。但是了n次后发现，这样的做法会导致图表严重变形，根本没法看，没办法，看来只能利用iText的API一点一点的做了。还好，iText的确够强大。就目前来看，完全可以处理项目的需求。下面就是我用iText结合JFreeChart在Web中将图表转换为PDF的方法。

本项目采用Struts2，分两个方法来处理，一个叫exportDeviceStat，调用它导出PDF，另一个叫getJFreeChart，调用它生成图形。下面直接上代码了：





          /**

Java代码
1. * 将图表导出到PDF  
2. * @return 
3. */  
4.public String exportDeviceStat() {  
5.    HttpServletResponse response = ServletActionContext.getResponse();  
6.      
7.    String fileTitle = year + "年" + month + "月各办公区设备运行情况统计";  
8.      
9.    response.setContentType("application/pdf;charset=utf-8");  
10.    response.addHeader("Content-Disposition", "attachment;filename=" + encodeFilename(fileTitle) + ".pdf");  
11. 
12.    //获得办公区列表  
13.    List<Location> locationList = SystemCache.getLocationListFromCache();  
14.      
15.    if (null != locationList && locationList.size() > 0) {  
16.          
17.        //创建Document对象  
18.        Document document = new Document();  
19. 
20.        try {  
21.            //创建PDF对象实例，直接输出到网页上  
22.            PdfWriter.getInstance(document, response.getOutputStream());  
23. 
24.            //设置文档字体  
25.            BaseFont bfChinese = BaseFont.createFont("STSongStd-Light", "UniGB-UCS2-H", false);  
26.            com.lowagie.text.Font fontChinese = new com.lowagie.text.Font(bfChinese, 12, com.lowagie.text.Font.NORMAL, Color.BLACK);  
27.              
28.            // 添加PDF文档的一些信息  
29.            document.addTitle(fileTitle);  
30.            document.addAuthor("设备运行情况统计");  
31.            document.addSubject("");  
32.            document.addKeywords("");  
33.            document.addCreator("设备运行情况统计");  
34.              
35.                HeaderFooter footer = new HeaderFooter(new Phrase(" 第", fontChinese), new Phrase("页 ", fontChinese));  
36.            footer.setBorder(Rectangle.NO_BORDER);  
37.                footer.setAlignment(Element.ALIGN_RIGHT);  
38.                document.setFooter(footer);  
39. 
40.            // 打开文档，将要写入内容  
41.            document.open();  
42. 
43.            // 文档标题标题  
44.            document.add(new Paragraph(fileTitle, fontChinese));  
45. 
46.            // 换行  
47.            document.add(Chunk.NEWLINE);  
48.   
49.            // 插入表格  
50.            com.lowagie.text.Font f8 = new com.lowagie.text.Font(bfChinese, 8, com.lowagie.text.Font.BOLD);  
51.            com.lowagie.text.Font f12 = new com.lowagie.text.Font(bfChinese, 12, com.lowagie.text.Font.BOLD);  
52. 
53.            //生成每个办公区的统计报表  
54.            for (Location location : locationList) {  
55.                //生成一个2列的表格  
56.                PdfPTable table = new PdfPTable(2);  
57.                  
58.                // 宽度定位100%  
59.                table.setWidthPercentage(100);  
60.                table.setHorizontalAlignment(PdfPTable.ALIGN_LEFT);  
61.                  
62.                // 创建第一行  
63.                PdfPCell cell = new PdfPCell();  
64.                cell.setBorderColor(new Color(255, 255, 255));  
65.                cell.setBackgroundColor(new Color(24, 198, 248));  
66.                cell.setHorizontalAlignment(PdfPCell.ALIGN_CENTER);  
67.                cell.setColspan(2);  
68.                cell.setVerticalAlignment(PdfPCell.ALIGN_CENTER);  
69.                  
70.                //第一行中显示的文字  
71.                cell.setPhrase(new Paragraph(location.getLocationName() + "办公区设备运行情况统计", f12));  
72.                table.addCell(cell);  
73.                  
74.                //插入统计图  
75.                PdfPCell newcell = new PdfPCell();  
76.                  
77.                newcell.setBorderColor(new Color(255, 255, 255));  
78.                //设备故障率统计，JFreeChart生成图表并返回  
79.                Image img = Image.getInstance("http://localhost:8080/DeviceStat/getJFreeChart.html?method=getDeviceNormalCount&locationId=" + location.getLocationId() + "&year=" + year + "&month=" + month);  
80.                img.setAbsolutePosition(0, 0);  
81.                newcell.setImage(img);  
82.                table.addCell(newcell);  
83.                  
84.                //故障类型统计，JFreeChart生成图表并返回  
85.                img = Image.getInstance("http://localhost:8080/DeviceStat/getJFreeChart.html?method=getDeviceAbnormalCount&locationId=" + location.getLocationId() + "&year=" + year + "&month=" + month);  
86.                img.setAbsolutePosition(0, 0);  
87.                newcell.setImage(img);  
88.                table.addCell(newcell);  
89.                  
90.                  
91.                document.add(table);  
92.            }  
93.              
94.        } catch (DocumentException de) {  
95.            System.err.println(de.getMessage());  
96.        } catch (IOException ioe) {  
97.            System.err.println(ioe.getMessage());  
98.        } finally {  
99.            // 关闭打开的文档  
100.            document.close();  
101.        }  
102.    }  
103.    return NONE;  
104.} 
* 将图表导出到PDF
* @return
*/
public String exportDeviceStat() {
HttpServletResponse response = ServletActionContext.getResponse();

String fileTitle = year + "年" + month + "月各办公区设备运行情况统计";

response.setContentType("application/pdf;charset=utf-8");
response.addHeader("Content-Disposition", "attachment;filename=" + encodeFilename(fileTitle) + ".pdf");

//获得办公区列表
List<Location> locationList = SystemCache.getLocationListFromCache();

if (null != locationList && locationList.size() > 0) {

//创建Document对象
Document document = new Document();

try {
  //创建PDF对象实例，直接输出到网页上
  PdfWriter.getInstance(document, response.getOutputStream());

   //设置文档字体
   BaseFont bfChinese = BaseFont.createFont("STSongStd-Light", "UniGB-UCS2-H", false);
   com.lowagie.text.Font fontChinese = new com.lowagie.text.Font(bfChinese, 12, com.lowagie.text.Font.NORMAL, Color.BLACK);

   // 添加PDF文档的一些信息
   document.addTitle(fileTitle);
  document.addAuthor("设备运行情况统计");
  document.addSubject("");
   document.addKeywords("");
   document.addCreator("设备运行情况统计");

    HeaderFooter footer = new HeaderFooter(new Phrase(" 第", fontChinese), new Phrase("页 ", fontChinese));
   footer.setBorder(Rectangle.NO_BORDER);
    footer.setAlignment(Element.ALIGN_RIGHT);
    document.setFooter(footer);

// 打开文档，将要写入内容
document.open();

// 文档标题标题
document.add(new Paragraph(fileTitle, fontChinese));

// 换行
document.add(Chunk.NEWLINE);

// 插入表格
com.lowagie.text.Font f8 = new com.lowagie.text.Font(bfChinese, 8, com.lowagie.text.Font.BOLD);
com.lowagie.text.Font f12 = new com.lowagie.text.Font(bfChinese, 12, com.lowagie.text.Font.BOLD);

//生成每个办公区的统计报表
for (Location location : locationList) {
//生成一个2列的表格
PdfPTable table = new PdfPTable(2);

// 宽度定位100%
table.setWidthPercentage(100);
table.setHorizontalAlignment(PdfPTable.ALIGN_LEFT);

// 创建第一行
PdfPCell cell = new PdfPCell();
cell.setBorderColor(new Color(255, 255, 255));
cell.setBackgroundColor(new Color(24, 198, 248));
cell.setHorizontalAlignment(PdfPCell.ALIGN_CENTER);
cell.setColspan(2);
cell.setVerticalAlignment(PdfPCell.ALIGN_CENTER);

//第一行中显示的文字
cell.setPhrase(new Paragraph(location.getLocationName() + "办公区设备运行情况统计", f12));
table.addCell(cell);

//插入统计图
PdfPCell newcell = new PdfPCell();

newcell.setBorderColor(new Color(255, 255, 255));
//设备故障率统计，JFreeChart生成图表并返回
Image img = Image.getInstance("http://localhost:8080/DeviceStat/getJFreeChart.html?method=getDeviceNormalCount&locationId=" + location.getLocationId() + "&year=" + year + "&month=" + month);
img.setAbsolutePosition(0, 0);
newcell.setImage(img);
table.addCell(newcell);

//故障类型统计，JFreeChart生成图表并返回
img = Image.getInstance("http://localhost:8080/DeviceStat/getJFreeChart.html?method=getDeviceAbnormalCount&locationId=" + location.getLocationId() + "&year=" + year + "&month=" + month);
img.setAbsolutePosition(0, 0);
newcell.setImage(img);
table.addCell(newcell);


document.add(table);
}

} catch (DocumentException de) {
System.err.println(de.getMessage());
} catch (IOException ioe) {
System.err.println(ioe.getMessage());
} finally {
// 关闭打开的文档
document.close();
}
}
return NONE;
}

          /**

Java代码
1. * 用JFreeChart生成统计图  
2. * @return 
3. */  
4.public String getJFreeChart() {  
5.    HttpServletResponse response = ServletActionContext.getResponse();  
6.      
7.    response.setContentType("image/jpeg;charset=utf-8");  
8.      
9.    //获得办公区信息  
10.    Location location = SystemCache.getLocationByIdFromCache(locationId);  
11.      
12.    if (null != location) {  
13.        DefaultPieDataset data = getDataSet(method, locationId, year, month);  
14.        JFreeChart chart = ChartFactory.createPieChart("getDeviceNormalCount".equals(method) ? "办公区设备运行情况统计" : "故障类型分布", data, true, false, false);  
15.          
16.        chart.setBorderPaint(new Color(255,255,255));  
17.        chart.setBorderVisible(false);  
18.        chart.getTitle().setFont(new Font("宋体", Font.BOLD,12));  
19.        chart.getLegend().setItemFont(new Font("宋体", Font.BOLD,12));  
20.        PiePlot piePlot= (PiePlot) chart.getPlot();//获取图表区域对象  
21.        piePlot.setBackgroundPaint(new Color(255,255,255));  
22.        piePlot.setOutlineVisible(false);  //无边框  
23.        piePlot.setNoDataMessage("暂无统计数据");  //设置无数据时的显示内容  
24.            piePlot.setLabelFont(new Font("宋体",Font.BOLD,12));     //饼图旁边的中文  
25.        //按百分比显示  
26.            piePlot.setLabelGenerator(new  StandardPieSectionLabelGenerator(     
27.                        "{0}:{2}", NumberFormat.getNumberInstance(), new DecimalFormat("0.00%")  
28.                ));  
29.          
30.        try {  
31.            //输出图标  
32.            ChartUtilities.writeChartAsJPEG(response.getOutputStream(),  
33.                1,chart,400,300,null);  
34.              
35.            response.flushBuffer();  
36.        } catch (IOException e) {  
37.            // TODO Auto-generated catch block  
38.            e.printStackTrace();  
39.        } finally {  
40.              
41.        }  
42.    }  
43.      
44.    return NONE;  
45.}  
46. 
47./** 
48. * 获得JFreeChart需要的数据 
49. * @param method 
50. * @param locationId 
51. * @param year 
52. * @param month 
53. * @return 
54. */ 
55.private static DefaultPieDataset getDataSet(String method, Integer locationId, Integer year, Integer month) {  
56.    DefaultPieDataset dataset = new DefaultPieDataset();  
57.      
58.    if ("getDeviceNormalCount".equals(method)) {  
59.        Integer normalCount = SystemCache.getDeviceStatNormalCountFromCache(locationId, year, month);  
60.        Integer abNormalCount = SystemCache.getDeviceStatAbnormalCountFromCache(locationId, year, month);  
61.          
62.        if (null != normalCount && 0 != normalCount) {  
63.            dataset.setValue("设备正常率", normalCount);  
64.        }   
65.        if (null != abNormalCount && 0 != abNormalCount) {  
66.            dataset.setValue("设备故障率", abNormalCount);  
67.        }  
68.    } else {  
69.        List<DeviceBreakdownTypeCount> countList = SystemCache.getDeviceBreakdownTypeCountFromCache(locationId, year, month);  
70.        if (null != countList && countList.size() > 0) {  
71.            for (DeviceBreakdownTypeCount count : countList) {  
72.                dataset.setValue(Constant.DEVICE_BREAKDOWN_TYPE_DESC[count.getBreakdownType()], count.getBreakdownTypeCount());  
73.            }  
74.        }  
75.    }  
76.      
77.    return dataset;  
78.} 
* 用JFreeChart生成统计图
* @return
*/
public String getJFreeChart() {
HttpServletResponse response = ServletActionContext.getResponse();

response.setContentType("image/jpeg;charset=utf-8");

//获得办公区信息
Location location = SystemCache.getLocationByIdFromCache(locationId);

if (null != location) {
DefaultPieDataset data = getDataSet(method, locationId, year, month);
JFreeChart chart = ChartFactory.createPieChart("getDeviceNormalCount".equals(method) ? "办公区设备运行情况统计" : "故障类型分布", data, true, false, false);

chart.setBorderPaint(new Color(255,255,255));
chart.setBorderVisible(false);
chart.getTitle().setFont(new Font("宋体", Font.BOLD,12));
chart.getLegend().setItemFont(new Font("宋体", Font.BOLD,12));
PiePlot piePlot= (PiePlot) chart.getPlot();//获取图表区域对象
piePlot.setBackgroundPaint(new Color(255,255,255));
piePlot.setOutlineVisible(false);  //无边框
piePlot.setNoDataMessage("暂无统计数据");  //设置无数据时的显示内容
    piePlot.setLabelFont(new Font("宋体",Font.BOLD,12));     //饼图旁边的中文
//按百分比显示
    piePlot.setLabelGenerator(new  StandardPieSectionLabelGenerator(  
                    "{0}:{2}", NumberFormat.getNumberInstance(), new DecimalFormat("0.00%")
            ));
   
try {
//输出图标
ChartUtilities.writeChartAsJPEG(response.getOutputStream(),
1,chart,400,300,null);

response.flushBuffer();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {

}
}

return NONE;
}

/**
* 获得JFreeChart需要的数据
* @param method
* @param locationId
* @param year
* @param month
* @return
*/
private static DefaultPieDataset getDataSet(String method, Integer locationId, Integer year, Integer month) {
DefaultPieDataset dataset = new DefaultPieDataset();

if ("getDeviceNormalCount".equals(method)) {
Integer normalCount = SystemCache.getDeviceStatNormalCountFromCache(locationId, year, month);
Integer abNormalCount = SystemCache.getDeviceStatAbnormalCountFromCache(locationId, year, month);

if (null != normalCount && 0 != normalCount) {
dataset.setValue("设备正常率", normalCount);
}
if (null != abNormalCount && 0 != abNormalCount) {
dataset.setValue("设备故障率", abNormalCount);
}
} else {
List<DeviceBreakdownTypeCount> countList = SystemCache.getDeviceBreakdownTypeCountFromCache(locationId, year, month);
if (null != countList && countList.size() > 0) {
for (DeviceBreakdownTypeCount count : countList) {
dataset.setValue(Constant.DEVICE_BREAKDOWN_TYPE_DESC[count.getBreakdownType()], count.getBreakdownTypeCount());
}
}
}

return dataset;
} 


   最后运行的结果：

评论

1 楼 xm_koma 2010-08-02  

有没有将JFreeChart生成的图表导出到Excel中的例子呢？