SpringBoot整合Freemarker生成动态Html文件，并转成png图片

　　
	gui.ava 　　
	html2image

   org.springframework.boot
   spring-boot-starter-freemarker

// 在yml 文件中设置Freemarker模板参数
spring:
  profiles:
    active: dev
  ## 设定ftl文件路径
  freemarker:
    template-loader-path: classpath:/templates
    ##是否开启缓存
    cache: false
    ##设置编码格式
    charset: utf-8
    ##检查模板路径是否存在
    check-template-location: true
    ##请求头格式
    content-type: text/html
    expose-request-attributes: false
    expose-session-attributes: false
    request-context-attribute: request
    suffix: .html
    ##模板生成位置
    path: /data/image/skc/images/FreemarkerTemplates.html

####3.模板文件

//模板文件  index.html


  
    
    
    
    
  
  
    

      
      

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        ${FreemarkerFormVO.userName}
      
      

        ${FreemarkerFormVO.department}
      

      
      

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　　 @ApiOperation(value="模板")
    @PostMapping("/freemarker")
    public  ResponseEntity> freemarkerIndex(@Valid @RequestBody FreemarkerFormVO bean, Model model) {
        model.addAttribute("FreemarkerFormVO",bean);
        Map root = new HashMap(1);
        root.put("FreemarkerFormVO", bean);
        String filePath = freeMarkerContent(root);
        try {
            File file = ResourceUtils.getFile(filePath);
            String html = FileReader.create(file).readString();
            String s = switchToPic(html);
            s= s.replaceAll("\r\n", "");
            base64StringToImage(s);
            return ResultBeanUtil.success(s);
        } catch (Exception e) {
            log.error("", e);
        }
        return ResultBeanUtil.success(filePath);
    }


    //测试的时候  生成到D盘的AMD文件夹下
    private String freeMarkerContent(Map root) {
        try {
            Template temp = cfg.getTemplate("index.html");
            //以classpath下面的static目录作为静态页面的存储目录，同时命名生成的静态html文件名称
//            File pathFile = new File(path.substring(path.indexOf('/')));
            File pathFile = new File("D:\AMD\FreemarkerTemplates.html");
            if (!pathFile.getParentFile().exists()) {
                pathFile.getParentFile().mkdirs();
            }
            Writer file = new FileWriter(pathFile);
            temp.process(root, file);
            file.flush();
            file.close();
            return "D:\AMD\FreemarkerTemplates.html";
        } catch (IOException | TemplateException e) {
            log.error(e.getMessage(), e);
        }
        return null;
    }

    //变成base64格式
    private  String switchToPic(String html) {
        HtmlImageGenerator imageGenerator = new HtmlImageGenerator();
        imageGenerator.getBufferedImage();
//        File path=new File(html);
//        String urlPath=path.toURL().toString();
//        imageGenerator.loadUrl(urlPath);
        imageGenerator.loadHtml(html);
        //这里如果指定了盘符，可以直接存在本地，自己本地写demo的话可以用
        String imageName = imagePath + "html1.png";
        imageGenerator.saveAsImage(imageName);
        BufferedImage buffimg = imageGenerator.getBufferedImage();
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        try {
            ImageIO.write(buffimg, "png", os);
        } catch (Exception e) {
            e.printStackTrace();
        }
        byte[] bytes1 = os.toByteArray();
        return encoder.encodeBuffer(bytes1).trim();
    }

    //base64转图片，生成到指定目录
    private void base64StringToImage(String base64) {
        try {
            byte[] bytes1 = decoder.decodeBuffer(base64);
            ByteArrayInputStream bais = new ByteArrayInputStream(bytes1);
            BufferedImage bi1 = ImageIO.read(bais);
            File f = new File("D:\AMD\html.png");
            ImageIO.write(bi1, "png", f);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

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