java处理word公式（wmf格式转换成svg）（svg格式转换成png）

wmf格式转换成svg

把wmf格式转成svg格式，这样就能在浏览器中显示了需要第三方jar包：wmf2svg-0.9.6.jar//wmf格式的图片转换成svg格式
private void convert(String file,String dest) throws Exception{
InputStream in = new FileInputStream(file);
WmfParser parser = new WmfParser();
final SvgGdi gdi = new SvgGdi(false);
parser.parse(in, gdi);
Document doc = gdi.getDocument();
OutputStream out = new FileOutputStream(dest);
if (dest.endsWith(".svgz")) {
out = new GZIPOutputStream(out);
}
output(doc, out);
}

private void output(Document doc, OutputStream out) throws Exception {
TransformerFactory factory = TransformerFactory.newInstance();
Transformer transformer = factory.newTransformer();
transformer.setOutputProperty(OutputKeys.METHOD, "xml");
transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.setOutputProperty(OutputKeys.DOCTYPE_PUBLIC,"-//W3C//DTD SVG 1.0//EN");
transformer.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM,"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd");
transformer.transform(new DOMSource(doc), new StreamResult(out));
ByteArrayOutputStream bos = new ByteArrayOutputStream();
transformer.transform(new DOMSource(doc), new StreamResult(bos));
out.flush();
out.close();
}

svg格式转换成png

导入maven依赖<dependency>
<groupId>com.kenai.nbpwr</groupId>
<artifactId>org-apache-batik-all</artifactId>
<version>1.7-201003011305</version>
</dependency>
<!-- https://mvnrepository.com/artifact/xml-apis/xml-apis-ext -->
<dependency>
<groupId>xml-apis</groupId>
<artifactId>xml-apis-ext</artifactId>
<version>1.3.04</version>
</dependency>
<dependency>
<groupId>org.apache.xmlgraphics</groupId>
<artifactId>batik-codec</artifactId>
<version>1.7</version>
</dependency>

public class Test {
/**
* 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();
}
}
}
}

// 读取svg
public static String readToString(String fileName) {
String encoding = "UTF-8";
File file = new File(fileName);
Long filelength = file.length();
byte[] filecontent = new byte[filelength.intValue()];
try {
FileInputStream in = new FileInputStream(file);
in.read(filecontent);
in.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
return new String(filecontent, encoding);
} catch (UnsupportedEncodingException e) {
System.err.println("The OS does not support " + encoding);
e.printStackTrace();
return null;
}
}

public static void main(String[] args) {
String svgCode = readToString("C:\\Users\\Administrator\\Desktop\\1.svg");
try {
convertToPng(svgCode,"D:/1/1.png");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (TranscoderException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}