SVG（Scalable Vector Graphics）是一种基于XML的图像格式，用于描述二维矢量图形。用户在网页上展示高质量的矢量图形，svg图形可以无限放大或缩小而不会失真，保持清晰的边缘和线条。
java对于svg的处理其实比较麻烦，java需要依赖

解析svg的宽高属性

public static void main(String[] args) throws IOException {String svgString = new String(Files.readAllBytes(Paths.get("/Users/qweasdzxc/Downloads/test.svg")), "utf-8");String width = StringUtils.EMPTY;String height = StringUtils.EMPTY;try {// 创建XML解析器DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();DocumentBuilder builder = factory.newDocumentBuilder();InputSource inputSource = new InputSource(new StringReader(svgString));Document document = builder.parse(inputSource);// 获取SVG的根元素Element root = document.getDocumentElement();// 获取SVG的宽高属性width = root.getAttribute("width");height = root.getAttribute("height");} catch (Exception e) {}System.out.println(width + "___" + height);}

替换宽高为指定数据

   private static String resizeSvg(String svgStr, Integer newWidth, Integer newHeight) {if (Objects.isNull(newHeight) || Objects.isNull(newWidth) || newHeight <= 0 || newWidth <= 0) {return svgStr;}String pattern = "<svg[^>]*(?:\\s(width|height)=('|\")(\\d*(?:\\.\\d+)?)(?:px)?('|\"))[^>]*(?:\\s(width|height)=('|\")(\\d*(?:\\.\\d+)?)(?:px)?('|\"))[^>]*>";Pattern r = Pattern.compile(pattern);Matcher m = r.matcher(svgStr);// 检查字符串中是否包含匹配的内容if (m.find()) {final String formatStr = "%s=\"%s\"";svgStr = svgStr.replace(String.format(formatStr, m.group(1), m.group(3)),String.format(formatStr, m.group(1), m.group(1).equals("height") ? newHeight : newWidth)).replace(String.format(formatStr, m.group(5), m.group(7)),String.format(formatStr, m.group(5), m.group(5).equals("height") ? newHeight : newWidth));}return svgStr;}