一、引入freemarker maven依赖
<!--freemarker模板--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-freemarker</artifactId> </dependency>
二、在项目resources目录下就可以创建以ftl结尾的引擎模板啦
WHImgShare.ftl 内容如下
<html lang="en"> <head> </head> <body> <div ref="el" class="valueshow"> <img class="" src="${bgImg}" alt=""/> <div class="valueshow-box "> <p class="vs-box-txt">You can transfer</p> <p class="vs-box-val">${amtValue} Mile</p> </div> </div> </body> </html>
三、定义接口
public interface IFreemarkerService { /** * @Description: 模板生成 * @data: [model, templatePath] * @return: java.lang.String * @Date: 2023-03-65 10:12:26 */ String shareInfoToHtml(Map<String,Object> model,String templatePath); } import freemarker.template.Configuration; import freemarker.template.Template; import lombok.extern.slf4j.Slf4j; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.ui.freemarker.FreeMarkerTemplateUtils; import java.util.Map; @Service @Slf4j public class FreemarkerServiceImpl implements IFreemarkerService { @Autowired Configuration configuration; /** * @param model * @param templatePath * @Description: 模板生成 * @data: [model, templatePath] * @return: java.lang.String * @Date: 2023-03-65 10:12:26 */ @Override public String shareInfoToHtml(Map<String, Object> model, String templatePath) { Template template = null; try { template = configuration.getTemplate(templatePath); return FreeMarkerTemplateUtils.processTemplateIntoString(template, model); } catch (Exception e) { log.info("Freemarker模板渲染视图失败"+e.getMessage()); } return ""; } }
四、业务调用
// 传入数据modelMap + 模板名称 String html = iFreemarkerService.shareInfoToHtml(modelMap, "/WHImgShare.ftl"); public class ImageUtil { /** * @Description: html转图片 * @data: [html, width, height] html字符串、宽、高 * @return: java.awt.image.BufferedImage * @Date: 2023-03-65 14:09:57 */ public static BufferedImage turnImage(String html, Integer width, Integer height) throws Exception { // 转文档 byte[] bytes=html.getBytes(); ByteArrayInputStream bin = new ByteArrayInputStream(bytes); DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); Document document = builder.parse(bin); /* 画笔生成图 */ DOMAnalyzer da = new DOMAnalyzer(document); // 创建一个字节流 InputStream is = new ByteArrayInputStream(html.getBytes(StandardCharsets.UTF_8)); DocumentSource docSource = new StreamDocumentSource(is, null, "text/html; charset=utf-8"); // 设置样式属性 da.attributesToStyles(); da.addStyleSheet(null, CSSNorm.stdStyleSheet(), DOMAnalyzer.Origin.AGENT); da.addStyleSheet(null, CSSNorm.userStyleSheet(), DOMAnalyzer.Origin.AGENT); da.addStyleSheet(null, CSSNorm.formsStyleSheet(), DOMAnalyzer.Origin.AGENT); da.getStyleSheets(); // 转图片 GraphicsEngine contentCanvas = new GraphicsEngine(da.getRoot(), da, docSource.getURL()); contentCanvas.createLayout(new Dimension(width, height)); // contentCanvas.setSize(width, height); contentCanvas.setUseKerning(false); contentCanvas.setAutoSizeUpdate(false); contentCanvas.getConfig().setClipViewport(false); contentCanvas.getConfig().setLoadImages(true); contentCanvas.getConfig().setLoadBackgroundImages(true); // 生成图片 BufferedImage img = contentCanvas.getImage(); //图片裁剪(移除白边) Rectangle bounds = getBounds(img, Color.WHITE); //输出当前图片宽高 BufferedImage cutBufferedImage = img.getSubimage(bounds.x, bounds.y, bounds.width, bounds.height); // final FSImageWriter imageWriter = new FSImageWriter(); // imageWriter.setWriteCompressionQuality(0.0f); // // 生成图片名字 // String uuid = UUID.randomUUID().toString(); // //输出路径 // imageWriter.write(bufferedImage, "D:\\img\\" + uuid + ".png"); return bufferedImage; } public static MultipartFile bufferedImageToMultipartFile(BufferedImage bufferedImage,String filename,String originalFilename){ //创建一个ByteArrayOutputStream ByteArrayOutputStream os = new ByteArrayOutputStream(); try { //把BufferedImage写入ByteArrayOutputStream ImageIO.write(bufferedImage, "jpg", os); //ByteArrayOutputStream转成InputStream InputStream input = new ByteArrayInputStream(os.toByteArray()); //InputStream转成MultipartFile return new MockMultipartFile(filename, originalFilename, ContentType.IMAGE_JPEG.toString(), input); } catch (IOException e) { log.info("BufferedImageToMultipartFile error:"+e.getMessage()); } return null; } /** * @Description: 图片裁剪 * @data: [img, fillColor] 图像、颜色 * @return: java.awt.Rectangle * @Date: 2023-03-66 10:20:09 */ public static Rectangle getBounds(BufferedImage img, Color fillColor) { int top = getYInset(img, 20, 0, 1, fillColor); int bottom = getYInset(img, 20, img.getHeight() - 10, -1, fillColor); int left = getXInset(img, 10, top, 1, fillColor); int right = getXInset(img, img.getWidth() - 40, top, -1, fillColor); return new Rectangle(left, top, right - left, bottom - top); } public static int getYInset(BufferedImage img, int x, int y, int step, Color fillColor) { while (new Color(img.getRGB(x, y), true).equals(fillColor)) { y += step; } return y; } public static int getXInset(BufferedImage img, int x, int y, int step, Color fillColor) { while (new Color(img.getRGB(x, y), true).equals(fillColor)) { x += step; } return x; } /** * 模拟 http post请求 * * @param httpUrl * @return * @throws IOException */ public static InputStream dowloadFile(String httpUrl) throws IOException { URL url = null; try { url = new URL(httpUrl); } catch (MalformedURLException e1) { e1.printStackTrace(); } URLConnection conn = url.openConnection(); InputStream inStream = conn.getInputStream(); return inStream; } /** * 读取字节输入流内容 * * @param is * @return */ public static byte[] readInputStream(InputStream is) { ByteArrayOutputStream writer = new ByteArrayOutputStream(); byte[] buff = new byte[1024 * 2]; int len = 0; try { while ((len = is.read(buff)) != -1) { writer.write(buff, 0, len); } is.close(); } catch (IOException e) { e.printStackTrace(); } return writer.toByteArray(); } }
