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;
}
}
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