java将svg图片转换为png格式图片

有时候在客户端使用svg画图，而在服务器端需要同样的图片，在服务器端重新画一遍是非常费事的。这时候我们就可以利用已有的svg直接通过下面的类转换成png格式。

使用这个方法需要引用batic相关的包，maven pom文件如下：

<!-- svg 生成png格式图片  --><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><!-- svg 生成png格式图片结束  -->

package cn.outofmemory.util;import java.io.ByteArrayInputStream;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;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;/** * 将svg转换为png格式的图片 *  *  */public abstract class SvgPngConverter {    /**     * 将svg字符串转换为png     *      * @param svgCode svg代码     * @param pngFilePath 保存的路径     * @throws TranscoderException svg代码异常     * @throws IOException io错误     */    public static void convertToPng(String svgCode, String pngFilePath) throws IOException,            TranscoderException {        File file = new File(pngFilePath);        FileOutputStream outputStream = null;        try {            file.createNewFile();            outputStream = new FileOutputStream(file);            convertToPng(svgCode, outputStream);        } finally {            if (outputStream != null) {                try {                    outputStream.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }    }    /**     * 将svgCode转换成png文件，直接输出到流中     *      * @param svgCode svg代码     * @param outputStream 输出流     * @throws TranscoderException 异常     * @throws IOException io异常     */    public static void convertToPng(String svgCode, OutputStream outputStream)            throws TranscoderException, IOException {        try {            byte[] bytes = svgCode.getBytes("utf-8");            PNGTranscoder t = new PNGTranscoder();            TranscoderInput input = new TranscoderInput(new ByteArrayInputStream(bytes));            TranscoderOutput output = new TranscoderOutput(outputStream);            t.transcode(input, output);            outputStream.flush();        } finally {            if (outputStream != null) {                try {                    outputStream.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }    }}