base64转图片 java

String path = "";
String filename = "";

File folder = new File(path);
if (!folder.exists()) {
folder.mkdirs();
}
File dest = new File(folder, filename);
BASE64Decoder decoder = new BASE64Decoder();
try {
FileOutputStream write = new FileOutputStream(dest);
// Base64解码
byte[] bytes = decoder.decodeBuffer(base64Str);
write.write(bytes);
write.close();
} catch (IOException e) {
throw new BusinessException("目标文件上传发生异常fileName:" + dest.getName(), e);
}