java 微信海报的实现

见效果：

1. 左上角添加头像，带白边

2. 右下角添加二维码

3. 二维码下添加文字

可实现图片圆角处理，设置图片的宽度，描边==

可实现字体添加与样式

(使用原始图片直接不让上传，模糊下内容)

见代码：

/*** Created by michaeltang on 2019/9/19.** 生成合成图片，以流方式返回给前端显示，用于配置生成海报场景* 可以绘制字体和图片，如：二维码，头像，注意元素的添加顺序，后加入的在上面*/public class ImagePainter {/*** 绘制类型：*/public static final String KEY_TYPE = "key_type";/*** 元素类型：FONT、IMAGE、SQUIRE*/public static final String KEY_ELEMENT = "key_content_element";/*** 字体封装类*/public static class FontElement {public int x;public int y;public int fontSize = 16;public Color fontColor;public boolean bold;public int fontWeight;public String content;public FontElement(){}public FontElement(int x, int y, int fontSize, Color fontColor, boolean bold, int fontWeight, String content) {this.x = x;this.y = y;this.fontSize = fontSize;this.fontColor = fontColor;this.bold = bold;this.fontWeight = fontWeight;this.content = content;}}/*** 图像封装样式*/public static class ImageElement {public int x;public int y;public int width;public int height;public boolean round = false;public int borderWidth = 1;public Color borderColor;public Color bkgColor;public String imageUrl;public ImageElement(){}public ImageElement(int x, int y, int width, int height, boolean round, int borderWidth, Color borderColor, Color bkgColor, String imgUrl){this.x = x;this.y = y;this.width = width;this.height = height;this.round = round;this.borderColor = borderColor;this.borderWidth = borderWidth;this.bkgColor = bkgColor;this.imageUrl = imgUrl;}}/*** 元素类型**/public static enum ElementType implements BaseEnum<ElementType, String> {FONT("FONT", "文字"),IMAGE("IMAGE", "图像");private String value;private String displayName;static Map<String, ElementType> enumMap = new HashMap<String, ElementType>();static {for (ElementType type : ElementType.values()) {enumMap.put(type.getValue(), type);}}private ElementType(String value, String displayName) {this.value = value;this.displayName = displayName;}@Overridepublic String getValue() {return this.value;}@Overridepublic String getDisplayName() {return this.displayName;}public static ElementType getEnum(String value) {return enumMap.get(value);}}/*** 生成合成图片，以流方式返回给前端显示，用于配置生成海报场景** @param request* @param response* @param backgroundUrl 大背景图Url* @param elements 元素数组，可以是字体，可以是图片，如二维码，头像，注意元素的添加顺序，后加入的在上面*/public static void getPaintedStream(HttpServletRequest request, HttpServletResponse response,String backgroundUrl, List<HashMap<String, Object>> elements){// 设置相应类型,告诉浏览器输出的内容为图片response.setContentType("image/jpeg");// 设置响应头信息，告诉浏览器不要缓存此内容response.setHeader("Pragma", "No-cache");response.setHeader("Cache-Control", "no-cache");try {// 将内存中的图片通过流动形式输出到客户端ImageIO.write(paint(backgroundUrl, elements), "JPEG", response.getOutputStream());} catch (Exception e) {}}public static BufferedImage paint(String backgroundUrl, List<HashMap<String, Object>> components) {if(StringUtils.isEmpty(backgroundUrl)) {throw new OpenmoreException("没有指定背景图像");}if(components == null || components.size() == 0) {throw new OpenmoreException("至少在图片指定一个绘制的组件");}BufferedImage bkgImage = readUrlImage(backgroundUrl);for (HashMap map: components) {Object obj = map.get(KEY_TYPE);if(obj == null) {continue;}ElementType type = (ElementType) map.get(KEY_TYPE);if(type == ElementType.FONT) {FontElement font = (FontElement)map.get(KEY_ELEMENT);drawFont(bkgImage, font);} else if(type == ElementType.IMAGE) {ImageElement image = (ImageElement)map.get(KEY_ELEMENT);drawImage(bkgImage, image);}}return bkgImage;}private static void drawFont(BufferedImage bkgImage, FontElement font){Graphics2D g = bkgImage.createGraphics();g.setColor(Color.WHITE);g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);if(font.bold) {g.setFont(new Font("Microsoft YaHei", Font.BOLD, font.fontSize));} else {g.setFont(new Font("Microsoft YaHei", Font.PLAIN, font.fontSize));}g.setColor(font.fontColor);g.drawString(font.content , font.x, font.y);g.dispose();}private static void drawImage(BufferedImage bkgImage, ImageElement img){Graphics2D g = bkgImage.createGraphics();g.setColor(Color.WHITE);g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);BufferedImage image = readUrlImage(img.imageUrl);if(img.round) {// 图片切成是一个圆型int width = img.width - img.borderWidth * 2;Ellipse2D.Double shape = new Ellipse2D.Double(img.x + img.borderWidth, img.y + img.borderWidth, width, width);g.setClip(shape);g.drawImage(image.getScaledInstance(img.width, img.width, Image.SCALE_SMOOTH), img.x, img.y, img.width, img.width, null);g.dispose();// 画白边Graphics2D g2 = bkgImage.createGraphics();g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);Stroke s = new BasicStroke(img.borderWidth * 3, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);g2.setStroke(s);g2.setColor(Color.WHITE);g2.drawOval(img.x, img.y, img.width, img.width);g2.dispose();} else {g.drawImage(image.getScaledInstance(img.width, img.height, Image.SCALE_SMOOTH), img.x, img.y, img.width, img.height, null);g.dispose();}}private static BufferedImage readUrlImage(String urlString){try {URL url = new URL(urlString);DataInputStream dataInputStream = new DataInputStream(url.openStream());// 读取背景图return ImageIO.read(dataInputStream);} catch (MalformedURLException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}throw new OpenmoreException("图片生成错误");}
}

Controller测试代码：

{String bkgUrl = "http://source.wenxiaoyou.com/test/WechatIMG43.jpeg";List<HashMap<String, Object>> elements = new ArrayList<>();HashMap<String, Object> map = new HashMap<>();// 添加二维码map.put(ImagePainter.KEY_TYPE, ImagePainter.ElementType.IMAGE);ImagePainter.ImageElement image = new ImagePainter.ImageElement();image.x = 495;image.y = 980;image.width = 170;image.height = 170;image.imageUrl = "http://source.wenxiaoyou.com/image/1568947454861.jpg";map.put(ImagePainter.KEY_ELEMENT, image);elements.add(map);// 添加头像HashMap<String, Object> avatarMap = new HashMap<>();avatarMap.put(ImagePainter.KEY_TYPE, ImagePainter.ElementType.IMAGE);ImagePainter.ImageElement avatar = new ImagePainter.ImageElement();avatar.x = 30;avatar.y = 30;avatar.width = 128;avatar.height = 128;avatar.borderWidth = 2;avatar.round = true;avatar.imageUrl = "http://source.wenxiaoyou.com/test/1568886588882.jpg";avatarMap.put(ImagePainter.KEY_ELEMENT, avatar);elements.add(avatarMap);// 添加文字HashMap<String, Object> map2 = new HashMap<>();map2.put(ImagePainter.KEY_TYPE, ImagePainter.ElementType.FONT);ImagePainter.FontElement font = new ImagePainter.FontElement();font.content = "扫一扫，领取奖品";font.x = 510;font.y = 1170;font.fontColor = new Color(0, 0, 0);map2.put(ImagePainter.KEY_ELEMENT, font);elements.add(map2);ImagePainter.getPaintedStream(request, response, bkgUrl, elements);
}

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