java后台svg转成png,写详细一些
时间: 2023-08-10 10:02:42 浏览: 86
将SVG转换为PNG需要使用Java的第三方库,如Apache Batik或JavaFX。下面提供了使用Apache Batik将SVG转换为PNG的示例代码:
```java
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import javax.imageio.ImageIO;
import org.apache.batik.dom.svg.SVGDOMImplementation;
import org.apache.batik.svggen.SVGGeneratorContext;
import org.apache.batik.svggen.SVGGraphics2D;
import org.w3c.dom.DOMImplementation;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
public class SvgToPngConverter {
public static void main(String[] args) throws Exception {
// Load SVG file
File svgFile = new File("path/to/svg/file.svg");
Document svgDoc = getSvgDocument(svgFile);
// Create PNG file
File pngFile = new File("path/to/png/file.png");
OutputStream outputStream = new FileOutputStream(pngFile);
// Convert SVG to PNG
BufferedImage bufferedImage = convertToPng(svgDoc);
ImageIO.write(bufferedImage, "png", outputStream);
// Close output stream
outputStream.close();
}
private static Document getSvgDocument(File svgFile) throws Exception {
DOMImplementation domImpl = SVGDOMImplementation.getDOMImplementation();
String svgNS = SVGDOMImplementation.SVG_NAMESPACE_URI;
Document document = domImpl.createDocument(svgNS, "svg", null);
Element svgRoot = document.getDocumentElement();
svgRoot.setAttributeNS(null, "width", "100%");
svgRoot.setAttributeNS(null, "height", "100%");
org.apache.batik.dom.svg.SVGDOMImplementation impl = new org.apache.batik.dom.svg.SVGDOMImplementation();
SVGGeneratorContext ctx = SVGGeneratorContext.createDefault(document);
ctx.setPrecision(6);
ctx.setEmbeddedFontsOn(true);
SVGGraphics2D svgGenerator = new SVGGraphics2D(ctx, true);
BufferedImage bufferedImage = ImageIO.read(svgFile);
svgGenerator.drawImage(bufferedImage, 0, 0, null);
svgGenerator.dispose();
return svgGenerator.getDOMFactory().createDocument(svgNS, "svg", null).getDocumentElement();
}
private static BufferedImage convertToPng(Document svgDoc) throws Exception {
BufferedImage bufferedImage = new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB);
SVGGraphics2D g2d = new SVGGraphics2D(svgDoc);
g2d.setDeviceIndependent(true);
g2d.setRenderingHint(java.awt.RenderingHints.KEY_ANTIALIASING, java.awt.RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setRenderingHint(java.awt.RenderingHints.KEY_TEXT_ANTIALIASING, java.awt.RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
g2d.setRenderingHint(java.awt.RenderingHints.KEY_FRACTIONALMETRICS, java.awt.RenderingHints.VALUE_FRACTIONALMETRICS_ON);
g2d.setRenderingHint(java.awt.RenderingHints.KEY_RENDERING, java.awt.RenderingHints.VALUE_RENDER_QUALITY);
int w = (int) g2d.getSVGCanvasSize().getWidth();
int h = (int) g2d.getSVGCanvasSize().getHeight();
bufferedImage = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
g2d.drawImage(bufferedImage, 0, 0, null);
g2d.dispose();
return bufferedImage;
}
}
```
首先,该代码使用Apache Batik的SVGDOMImplementation类创建SVG文档对象,并设置SVG的宽度和高度。接着,代码使用SVGGraphics2D类将SVG文件绘制到缓冲区中。最后,代码使用ImageIO将缓冲区中的图像写入PNG文件。
请注意,这个示例只是一个基础的代码框架,您可能需要根据自己的需求进行修改。