将图片路径转换为图片的base64格式

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	// 图片转化成base64字符串
  	public static String GetImageStr(String imgFile) throws Exception {// 将图片文件转化为字节数组字符串，并对其进行Base64编码处理
  		InputStream in = null;
  		byte[] data = null;
  		// 读取图片字节数组
  		ByteArrayOutputStream outputstream = null;
  		int index = imgFile.lastIndexOf(".");
  		String args1 = "jpg";
  		if (index > -1 && index < (imgFile.length() - 1)) {
  			args1 = imgFile.substring(index + 1);
  		} else {
  			throw new Exception("文件后缀有误url=" + imgFile);
  		}
  		URL url = new URL(imgFile);
  		BufferedImage bufferedImage=null;
  		try {
  			bufferedImage = ImageIO.read(url);
  		} catch (Exception e) {
  			throw new Exception("读取图片url["+imgFile+"]有误！");
  		}
  		// 开始对图片进行压缩
  		outputstream = new ByteArrayOutputStream();
  		ImageIO.write(bufferedImage, args1, outputstream);
  		double k = outputstream.size();
  		int count = 0;
  		double com = 100 * 1024 * 0.9;// 比对基础大小
  		BASE64Encoder encoder = new BASE64Encoder();
  		return encoder.encode(outputstream.toByteArray());
  	}