java通过jasper文件生成jpg图片

iReport资料紧俏，整理好就赶紧传上来:

工具类：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());
                // 创建graphics输出器 
                JRGraphics2DExporter exporter = new JRGraphics2DExporter();
                // 创建一个影像对象  
                BufferedImage bufferedImage = new BufferedImage(jasperPrint.getPageWidth() * 4,
                        jasperPrint.getPageHeight() * 4, BufferedImage.TYPE_INT_RGB);
                // 取graphics  
                Graphics2D g = (Graphics2D) bufferedImage.getGraphics();
                // 设置相应参数信息  
                exporter.setParameter(JRGraphics2DExporterParameter.GRAPHICS_2D, g);
                exporter.setParameter(JRGraphics2DExporterParameter.ZOOM_RATIO, Float.valueOf(4));
                exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
                exporter.exportReport();
                g.dispose();// 释放资源信息  
                // 这里的bufferedImage就是最终的影像图像信息,可以通过这个对象导入. 
                ImageIO.write(bufferedImage, "JPEG", new File(jpgPath));
                info="success";
            } catch(JRException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }

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