Java 版本的 OFD文件转换助手

package com.carklote.helper; import org.ofdrw.converter.ImageMaker; import org.ofdrw.reader.OFDReader; import sun.misc.BASE64Decoder; import javax.imageio.ImageIO; import java.awt.image.BufferedImage; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.util.ArrayList; import java.util.Base64; import java.util.List; public class OfdHelper { public static final Base64.Encoder encoder = Base64.getEncoder(); /** * base64 转 input流 * @param base64字符串 * @return 输入流 */ public static InputStream base2InputStream(String base64string) { ByteArrayInputStream stream = null; try { BASE64Decoder decoder = new BASE64Decoder(); byte[] bytes1 = decoder.decodeBuffer(base64string); stream = new ByteArrayInputStream(bytes1); } catch (Exception e) { e.printStackTrace(); } return stream; } // File文件转换为base64编码1 public static String encodeBase64File(File filename) { byte[] buffer = null; FileInputStream inputFile; try { inputFile = new FileInputStream(filename); buffer = new byte[(int)filename.length()]; inputFile.read(buffer); inputFile.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return encoder.encodeToString(buffer); } public static List<String> ofdToImageBase64(File ofdFile,String format) { String fileBase64 = encodeBase64File(ofdFile); return ofdToImageBase64(fileBase64,format); } public static List<String> ofdToImageBase64(String ofdBase64,String format){ ByteArrayOutputStream os = null; List<String> list = new ArrayList<String>(); InputStream stream = base2InputStream(ofdBase64); try { OFDReader reader = new OFDReader(stream); ImageMaker imageMaker = new ImageMaker(reader, 15); for (int i = 0; i < imageMaker.pageSize(); i++) { // 4. 指定页码转换图片 BufferedImage image = imageMaker.makePage(i); os = new ByteArrayOutputStream(); ImageIO.write(image, format, os); byte[] dataList = os.toByteArray(); list.add(encoder.encodeToString(dataList)); } } catch (Exception e) { //e.printStackTrace(); } finally { try { if (os != null) {os.close();} if (stream != null) {stream.close();} }catch (Exception e){ //e.printStackTrace(); } } return list; } }