string和base64的相互转换

实习中遇到js调c++的dll生成图片,由于入参需要base64,接触需要转码的情况,就公司的方法作如下笔记:

图片转base64

/**
	 * 将图片转换成Base64编码
	 * @param imgFile 待处理图片
	 * @return
	 */

	public static String getImgStr(String imgFile) {
		//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
		//imgFile = "D:\\testPhoto.jpg";
		InputStream in = null;
		byte[] data = null;
		//读取图片字节数组
		try {
			in = new FileInputStream(imgFile);
			data = new byte[in.available()];
			in.read(data);
			in.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return new String(Base64.encode(data));
	}
	

base64转图片

public static boolean GenerateImage(String imgStr) { //对字节数组字符串进行Base64解码并生成图片  
		if (imgStr == null) //图像数据为空  
			return false;
		BASE64Decoder decoder = new BASE64Decoder();
		try {
			//Base64解码  
			byte[] b = decoder.decodeBuffer(imgStr);
			for (int i = 0; i < b.length; ++i) {
				if (b[i] < 0) {//调整异常数据  
					b[i] += 256;
				}
			}
			//生成jpeg图片  
			String imgFilePath = "D:\\tupian\\" + DateUtil.getCurrentDateToString("yyyyMMHHssmm") + ".jpg";//新生成的图片  
			OutputStream out = new FileOutputStream(imgFilePath);
			out.write(b);
			out.flush();
			out.close();
			return true;
		} catch (Exception e) {
			return false;
		}
	}

判断是否是base64

public static boolean isImageFromBase64(String base64Str) {
		boolean flag = false;
		try {
			BufferedImage bufImg = ImageIO.read(new ByteArrayInputStream(new BASE64Decoder().decodeBuffer(base64Str)));
			if (null == bufImg) {
				return flag;
			}
			flag = true;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return flag;
	}
	
}

代码摘曙光易通接口文件

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转载自blog.csdn.net/ChengquanLam/article/details/82970751