有時候在客戶端使用svg畫圖，而在服務器端需要同樣的圖片，在服務器端重新畫一遍是非常費事的。這時候我們就可以利用已有的svg直接通過下面的類轉換成png格式。
使用這個方法需要引用batic相關的包，maven pom文件如下：
<!-- svg 生成png格式圖片 -->
<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>
<!-- 此處不能使用2.9.1版本，使用2.9.1生成png會失敗 -->
<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格式圖片結束 -->
package com.yhb.web.util;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URL;
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 final class FileUtil {
/**
*@Description: 將svg字符串轉換為png
*@Author:
*@param svgCode svg代碼
*@param pngFilePath 保存的路徑
*@throws IOException io異常
*@throws TranscoderException svg代碼異常
*/
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 ();
}
}
}
}
/**
*@Description: 將svgCode轉換成png文件，直接輸出到流中
*@param svgCode svg代碼
*@param outputStream 輸出流
*@throws TranscoderException 異常
*@throws IOException io異常
*/
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 ();
}
}
}
}
}