/**
* 替換html中的base64圖片數(shù)據(jù)為實(shí)際圖片
* @param html
* @param fileRoot 本地路徑
* @param serRoot 服務(wù)器路徑
* @return
*/
public static String replaceBase64Image(String html,String fileRoot,String serRoot){
  File file = new File(fileRoot);
  if(!file.exists()){//文件根目錄不存在時(shí)創(chuàng)建
   new File(fileRoot).mkdirs();
  }
  String htmlContent = html;
  Pattern pattern = Pattern.compile("\\<img[^>]*src=\"data:image/[^>]*>");
  Matcher matcher = pattern.matcher(html);
  GUIDUtils.init();
  while(matcher.find()){  //找出base64圖片元素
   String str = matcher.group();
   String src = ExStringUtils.substringBetween(str, "src=\"", "\"");//src="..."
   String ext = ExStringUtils.defaultIfEmpty(ExStringUtils.substringBetween(str, "data:image/", ";"), "jpg");//圖片后綴
   String base64ImgData = ExStringUtils.substringBetween(str, "base64,", "\"");//圖片數(shù)據(jù)
   if(ExStringUtils.isNotBlank(ext)&&ExStringUtils.isNotBlank(base64ImgData)){
    //data:image/gif;base64,base64編碼的gif圖片數(shù)據(jù)
    //data:image/png;base64,base64編碼的png圖片數(shù)據(jù)
    if("jpeg".equalsIgnoreCase(ext)){//data:image/jpeg;base64,base64編碼的jpeg圖片數(shù)據(jù)
     ext = "jpg";
    } else if("x-icon".equalsIgnoreCase(ext)){//data:image/x-icon;base64,base64編碼的icon圖片數(shù)據(jù)
     ext = "ico";
    }
    String fileName = GUIDUtils.buildMd5GUID(false)+"."+ext;//待存儲(chǔ)的文件名
    String filePath = fileRoot+File.separator+fileName;//圖片路徑
    try {
     convertBase64DataToImage(base64ImgData, filePath);//轉(zhuǎn)成文件
     String serPath = serRoot+fileName;//服務(wù)器地址
     htmlContent = htmlContent.replace(src, serPath);//替換src為服務(wù)器地址
    } catch (IOException e) {
     e.printStackTrace();
    }
   }
  }
  return htmlContent;
}
/**
* 把base64圖片數(shù)據(jù)轉(zhuǎn)為本地圖片
* @param base64ImgData
* @param filePath
* @throws IOException
*/
public static void convertBase64DataToImage(String base64ImgData,String filePath) throws IOException {
  BASE64Decoder d = new BASE64Decoder();
  byte[] bs = d.decodeBuffer(base64ImgData);
  FileOutputStream os = new FileOutputStream(filePath);
  os.write(bs);
  os.close();
}