写了一个spring boot项目，支持传入svg文件转出png图片，并且自定义转出png的宽和高。

svg是矢量图，因此我们用svg可以转出任意大小的高清png大图。

主要代码如下：

import org.apache.batik.transcoder.Transcoder;
import org.apache.batik.transcoder.TranscoderException;
import org.apache.batik.transcoder.TranscoderInput;
import org.apache.batik.transcoder.TranscoderOutput;
import org.apache.batik.transcoder.image.PNGTranscoder;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;import javax.servlet.http.HttpServletResponse;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.Objects;/*** @author Peter Cheung* 2023/2/16 15:21*/
@RestController
public class SvgToPngController {/*** 上传svg* <p>* 然后* <p>* 下载png* <p>* consumes定义multipart/form-data*/@GetMapping(path = "download", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)public void download(float height, float width, MultipartFile file, HttpServletResponse response) throws IOException, TranscoderException {//MultipartFile转InputStreamInputStream in = new ByteArrayInputStream(file.getBytes());Transcoder transcoder = new PNGTranscoder();//设置png图片的宽和长transcoder.addTranscodingHint(PNGTranscoder.KEY_WIDTH, width);transcoder.addTranscodingHint(PNGTranscoder.KEY_HEIGHT, height);try {TranscoderInput input = new TranscoderInput(in);//清空responseresponse.reset();//强制下载不打开response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);//设置编码为UTF_8response.setCharacterEncoding(StandardCharsets.UTF_8.name());//Content-Disposition的作用：告知浏览器以何种方式显示响应返回的文件，用浏览器打开还是以附件的形式下载到本地保存//attachment表示以附件方式下载 inline表示在线打开 "Content-Disposition:inline; filename=文件名.mp3"//filename表示文件的默认名称，因为网络传输只支持URL编码，因此需要将文件名URL编码后进行传输，前端收到后需要反编码才能获取到真正的名称response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode((Objects.requireNonNull(file.getOriginalFilename()).split("\\."))[0], StandardCharsets.UTF_8.name()) + ".png");TranscoderOutput output = new TranscoderOutput(response.getOutputStream());transcoder.transcode(input, output);} finally {in.close();}}
}

所需依赖如下：

<dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!--文件上传--><dependency><groupId>commons-fileupload</groupId><artifactId>commons-fileupload</artifactId><version>1.4</version></dependency><dependency><groupId>commons-io</groupId><artifactId>commons-io</artifactId><version>2.11.0</version></dependency><dependency><groupId>batik</groupId><artifactId>batik-svggen</artifactId><version>1.6</version></dependency><dependency><groupId>batik</groupId><artifactId>batik-awt-util</artifactId><version>1.6</version></dependency><dependency><groupId>batik</groupId><artifactId>batik-bridge</artifactId><version>1.6</version></dependency><dependency><groupId>batik</groupId><artifactId>batik-css</artifactId><version>1.6</version></dependency><dependency><groupId>batik</groupId><artifactId>batik-dom</artifactId><version>1.6</version></dependency><dependency><groupId>batik</groupId><artifactId>batik-gvt</artifactId><version>1.6</version></dependency><dependency><groupId>batik</groupId><artifactId>batik-parser</artifactId><version>1.6</version></dependency><dependency><groupId>batik</groupId><artifactId>batik-script</artifactId><version>1.6</version></dependency><dependency><groupId>batik</groupId><artifactId>batik-svg-dom</artifactId><version>1.6</version></dependency><dependency><groupId>batik</groupId><artifactId>batik-transcoder</artifactId><version>1.6</version></dependency><dependency><groupId>batik</groupId><artifactId>batik-util</artifactId><version>1.6</version></dependency><dependency><groupId>batik</groupId><artifactId>batik-xml</artifactId><version>1.6</version></dependency><!-- 此处不能使用2.9.1版本，使用2.9.1生成png会失败 --><dependency><groupId>xerces</groupId><artifactId>xercesImpl</artifactId><version>2.5.0</version></dependency><dependency><groupId>xml-apis</groupId><artifactId>xmlParserAPIs</artifactId><version>2.0.2</version></dependency><dependency><groupId>org.axsl.org.w3c.dom.svg</groupId><artifactId>svg-dom-java</artifactId><version>1.1</version></dependency><dependency><groupId>xml-apis</groupId><artifactId>xml-apis</artifactId><version>2.0.0</version></dependency><dependency><groupId>org.w3c.css</groupId><artifactId>sac</artifactId><version>1.3</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency>
</dependencies>

演示如下：

首先，运行项目

使用接口调用工具调用接口

注意：get请求，路径如同，body里使用form-data，三个参数，file是你要上传的svg文件，height是转出png图片的高，width是转出png图片的长，height和width是数字类型，支持整数和小数。

发送请求，提取文件

如图，我将转出的png放于桌面

10000分辨率的超清大图

项目已经开源，开源🔗链接如下：

🔗svg转png