java怎么操作svg图片

Java可以使用第三方库Apache Batik来操作SVG图片。可以使用Batik来解析SVG文件、创建和修改SVG文件、渲染SVG文件并将其转换为其他格式的图像文件。以下是使用Batik库来读取和修改SVG文件的示例代码：

import org.apache.batik.anim.dom.SAXSVGDocumentFactory;
import org.apache.batik.anim.dom.SVGOMSVGElement;
import org.apache.batik.bridge.DocumentLoader;
import org.apache.batik.bridge.GVTBuilder;
import org.apache.batik.gvt.GraphicsNode;
import org.apache.batik.util.XMLResourceDescriptor;
import org.w3c.dom.Document;

import java.io.File;
import java.io.IOException;

public class SVGManipulationExample {
    public static void main(String[] args) throws IOException {
        // Load the SVG file
        String parser = XMLResourceDescriptor.getXMLParserClassName();
        SAXSVGDocumentFactory factory = new SAXSVGDocumentFactory(parser);
        File svgFile = new File("path/to/svg/file.svg");
        Document svgDoc = factory.createDocument(svgFile.toURI().toString());

        // Get the SVG element
        SVGOMSVGElement svgRoot = (SVGOMSVGElement) svgDoc.getDocumentElement();

        // Modify the SVG element (change the fill color of all paths)
        String newFillColor = "#FF0000";
        for (int i = 0; i < svgRoot.getChildNodes().getLength(); i++) {
            if (svgRoot.getChildNodes().item(i) instanceof org.apache.batik.dom.svg.SVGOMPathElement) {
                org.apache.batik.dom.svg.SVGOMPathElement path = (org.apache.batik.dom.svg.SVGOMPathElement) svgRoot.getChildNodes().item(i);
                path.setAttribute("fill", newFillColor);
            }
        }

        // Render the modified SVG file to a PNG file
        int width = 500;
        int height = 500;
        BufferedImage output = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2d = output.createGraphics();
        GVTBuilder builder = new GVTBuilder();
        DocumentLoader loader = new DocumentLoader();
        BridgeContext ctx = new BridgeContext(new UserAgentAdapter());
        ctx.setDynamicState(BridgeContext.DYNAMIC);
        GraphicsNode rootGN = builder.build(ctx, svgRoot);
        rootGN.paint(g2d);
        ImageIO.write(output, "png", new File("path/to/output/file.png"));
    }
}