base64和图片互相转换

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：

/**

* 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));

}

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;

}

}

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;

}

}