java通過jasper文件生成jpg圖片

iReport資料緊俏，整理好就趕緊傳上來:

工具類：JpgExport

public class JpgExportUtil {

    public static String Export(Map<String, Object> params,String jasperPath,String jpgPath) {
        String info = "";
        if(!"".equals(jasperPath)&&!"".equals(jpgPath)) {
            try {
                JasperPrint jasperPrint = JasperFillManager.fillReport(jasperPath, params, new JREmptyDataSource());
                // 創建graphics輸出器 
                JRGraphics2DExporter exporter = new JRGraphics2DExporter();
                // 創建一個影像對象  
                BufferedImage bufferedImage = new BufferedImage(jasperPrint.getPageWidth() * 4,
                        jasperPrint.getPageHeight() * 4, BufferedImage.TYPE_INT_RGB);
                // 取graphics  
                Graphics2D g = (Graphics2D) bufferedImage.getGraphics();
                // 設置相應參數信息  
                exporter.setParameter(JRGraphics2DExporterParameter.GRAPHICS_2D, g);
                exporter.setParameter(JRGraphics2DExporterParameter.ZOOM_RATIO, Float.valueOf(4));
                exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
                exporter.exportReport();
                g.dispose();// 釋放資源信息  
                // 這里的bufferedImage就是最終的影像圖像信息,可以通過這個對象導入. 
                ImageIO.write(bufferedImage, "JPEG", new File(jpgPath));
                info="success";
            } catch(JRException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }

        }else {
            info="null";
        }
        return info;
    }
}