JAVA中使用Apache Batik实现SVG文件转PDF文件导出

背景

业务中需要实现svg 编码转换为PDF或PNG文件进行导出的功能，通过查阅网上的资料，了解到Aspose.PDF和Apache 的 Batik包提供了相关的工具。两种方法都进行了尝试，最后发现Aspose导出的文件是有水印的，需要购买license才能去除水印，所以使用了Batik依赖来实现，在此做一下记录。

 

1.配置依赖

        <dependency>
            <groupId>org.apache.xmlgraphics</groupId>
            <artifactId>batik-transcoder</artifactId>
            <version>1.12</version>
        </dependency>
        <dependency>
            <groupId>org.apache.xmlgraphics</groupId>
            <artifactId>fop</artifactId>
            <version>2.4</version>
        </dependency>

 

2.代码实现 

• 工具类

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.apache.fop.svg.PDFTranscoder;

import java.io.*;


public class SvgUtils {

    /**
     * SVG转PNG
     * @param svgCode SVG代码
     * @param out 输出流
     * @throws TranscoderException
     * @throws IOException
     */
    public static void svg2PNG(String svgCode,OutputStream out) throws TranscoderException, IOException{
        Transcoder transcoder = new PNGTranscoder();
        svgConverte(svgCode, out, transcoder);
    }

    /**
     * SVG转PDF
     * @param svgCode SVG代码
     * @param out 输出流
     * @throws TranscoderException
     * @throws IOException
     */
    public static void svg2PDF(String svgCode,OutputStream out) throws TranscoderException, IOException{
        Transcoder transcoder = new PDFTranscoder();
        svgConverte(svgCode, out, transcoder);
    }

    private static void svgConverte(String svgCode, OutputStream out, Transcoder transcoder) throws IOException, TranscoderException {
        svgCode = svgCode.replaceAll(":rect", "rect");
        TranscoderInput input = new TranscoderInput(new StringReader(svgCode));
        TranscoderOutput output = new TranscoderOutput(out);
        svgConverte(input,output,transcoder);
    }
    private static void svgConverte(TranscoderInput input, TranscoderOutput output, Transcoder transcoder) throws IOException, TranscoderException {
        transcoder.transcode(input, output);
    }

}

 

• 业务代码

 public void exportFloorSvg(Long floorId, HttpServletRequest request, HttpServletResponse response) throws IOException, TranscoderException {
        try {
            FloorSvg floorSvg = floorSvgRepository.selectOne(FloorSvg.builder().floorId(floorId).build());
            if (floorSvg==null){
                throw new CommonException("SVG不存在");
            }
            //解析出svg串
            JSON json = JSONUtil.parse(floorSvg.getSvg());
            String svgCode=String.valueOf(json.getByPath("floorSvg"));
            //文件名
            String fileName=floorSvg.getFileKey()
                    .substring(floorSvg.getFileKey().indexOf("@")+1,floorSvg.getFileKey().lastIndexOf(".")+1)+"pdf";
            //导出pdf文件 头设置
            response.addHeader("Content-Disposition", "attachment;filename="+ java.net.URLEncoder.encode(fileName,"UTF-8"));
            response.setContentType("application/pdf");
            SvgUtils.svg2PDF(svgCode,response.getOutputStream()) ;
        }catch (Exception e){
            if (log.isDebugEnabled()){
                log.error(String.format("export pdf failed:%s",e.getMessage()));
            }
        }
    }