Freemaker 模板生成html文件带barcode4j条形码并转PDF

前面野了三篇博客，现在直接结合在一起做一个实例

首先生成条形码并且放入html转换成pdf下载下来，将所有功能集合在一起
1.条形码

String barcode=BarCodeUtil.create39Code(“A123456”);

实现方法

public static String create39Code(String code) {        ByteArrayOutputStream baos=new ByteArrayOutputStream();        try {            // Create the barcode bean            Code39Bean bean = new Code39Bean();            final int dpi = 140;            // Configure the barcode generator            bean.setModuleWidth(UnitConv.in2mm(1.0f / 140)); // makes the narrow            bean.setHeight(13);            bean.setWideFactor(3);// width exactly one pixel            bean.doQuietZone(false);            bean.setQuietZone(2);// 两边空白区            // bean.setMsgPosition(HumanReadablePlacement.HRP_NONE);            bean.setFontSize(5);            bean.setDisplayStartStop(true);            // Set up the canvas provider for monochrome JPEG output            BitmapCanvasProvider canvas = new BitmapCanvasProvider(baos, "image/png", dpi, BufferedImage.TYPE_BYTE_BINARY, false, 0);            // Generate the barcode            bean.generateBarcode(canvas, code);            // Signal end of generation            canvas.finish();        } catch (Exception e) {            logger.error("单号：{}生成条形码出错",code,e);        }        String base64Img=Base64.byteArrayToBase64(baos.toByteArray());        return base64Img;    }

2.模板赋值

    String html=FreemarkerUtil.getHtml(String base64Img);

实现方法：

public static String getHtml(String base64Img) throws Exception {        // 创建插值的Map        Map<String, Object> map = new HashMap<String, Object>();        map.put("users", base64Img);        StringWriter stringWriter = new StringWriter();        BufferedWriter writer = new BufferedWriter(stringWriter);        template.setEncoding("UTF-8");        // 执行插值，并输出到指定的输出流中        template.process(map, writer);        String html = stringWriter.toString();        writer.flush();        writer.close();        return html;    }

3.模板转PDF

ByteArrayOutputStream baos=FlyingSuacerUtil.htmlToPdf(String html);

实现方法：

public class FlyingSuacerUtil {    public static ByteArrayOutputStream htmlToPdf(String html) throws Exception {         ByteArrayOutputStream baos=new ByteArrayOutputStream();           ITextRenderer renderer = new ITextRenderer();        renderer.setDocumentFromString(html);        // 解决中文支持问题             ITextFontResolver fontResolver = renderer.getFontResolver();             String env=SystemConstant.getProperty("spring.profiles.active");        String os = System.getProperty("os.name");        String fontPath=SystemConstant.getProperty("font.simsun.path");        if(env.equals(Constants.ENV_DEVELOPMENT)&&os.startsWith(Constants.OS_WINDOWS)){            fontResolver.addFont("C:/Windows/Fonts/simsun.ttc", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);        }else{            fontResolver.addFont(fontPath, BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);        }        renderer.layout();             renderer.createPDF(baos);         return baos;    }     

最后是PDF输出流，将输出流传人PDF文件就好了。

public static void download(HttpServletResponse response, ByteArrayOutputStream baos, String fileName) throws IOException {        response.setHeader("Content-type", "text/html;charset=UTF-8");        response.setCharacterEncoding("utf-8");        response.setContentType("multipart/form-data");        response.setHeader("Content-Disposition", "attachment;fileName=" + new String(fileName.getBytes("UTF-8"),"ISO-8859-1"));        response.addHeader("Content-Length", String.valueOf(baos.size()));        OutputStream os = response.getOutputStream();        os.write(baos.toByteArray());        os.close();        baos.close();    }

或者：

File outFile = new File("D:\\index.pdf");            try {            outFile.createNewFile();            OutputStream os = new FileOutputStream(outFile);                    os.write(baos.toByteArray());            } catch (Exception e) {                e.printStackTrace();            } finally {                os.flush();                os.close();            }    }