svg 转 png .._svn转png

mvn依赖库

<dependency>
            <groupId>org.apache.xmlgraphics</groupId>
            <artifactId>batik-transcoder</artifactId>
            <version>1.9.1</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.xmlgraphics/batik-svg-dom -->
        <dependency>
            <groupId>org.apache.xmlgraphics</groupId>
            <artifactId>batik-svg-dom</artifactId>
            <version>1.9.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.xmlgraphics</groupId>
            <artifactId>batik-codec</artifactId>
            <version>1.9.1</version>
        </dependency>
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java 代码

package cn.com.eduedu.exam.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Base64;

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;

public class SVGUtils {

    public static void convertToPng(byte[] svgCode, OutputStream outputStream) throws TranscoderException, IOException {
        try {
            // byte[] bytes = svgCode.getBytes("utf-8");
            PNGTranscoder t = new PNGTranscoder();
            TranscoderInput input = new TranscoderInput(new ByteArrayInputStream(svgCode));
            TranscoderOutput output = new TranscoderOutput(outputStream);
            t.transcode(input, output);
            // outputStream.flush();
        } finally {
            if (outputStream != null) {
                try {
                    outputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    public static byte[]  convertToPngByte(byte[] bytes) throws TranscoderException, IOException {
        ByteArrayOutputStream byteoutput=new ByteArrayOutputStream();
        try {
            PNGTranscoder t = new PNGTranscoder();
            TranscoderInput input = new TranscoderInput(new ByteArrayInputStream(bytes));
            TranscoderOutput output = new TranscoderOutput(byteoutput);
            t.transcode(input, output);
            return byteoutput.toByteArray();
        } finally {
            if (byteoutput != null) {
                try {
                    byteoutput.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    public static void convertToPng(String svgCode, OutputStream outputStream) throws TranscoderException, IOException {
        convertToPng(svgCode.getBytes("utf-8"), outputStream);
    }

}
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参考了一些资料，但是总是报错，这个亲测没有问题..