文章以png为例
图片转base64可以参考:https://blog.csdn.net/qq_36138652/article/details/102664141
public class BASE64DecodedMultipartFile implements MultipartFile {
private final byte[] imgContent;
private final String header;
public BASE64DecodedMultipartFile(byte[] imgContent, String header) {
this.imgContent = imgContent;
this.header = header.split(";")[0];
}
@Override
public String getName() {
// TODO - implementation depends on your requirements
return System.currentTimeMillis() + Math.random() + "." + header.split("/")[1];
}
@Override
public String getOriginalFilename() {
// TODO - implementation depends on your requirements
return System.currentTimeMillis() + (int)Math.random() * 10000 + "." + header.split("/")[1];
}
@Override
public String getContentType() {
// TODO - implementation depends on your requirements
return header.split(":")[1];
}
@Override
public boolean isEmpty() {
return imgContent == null || imgContent.length == 0;
}
@Override
public long getSize() {
return imgContent.length;
}
@Override
public byte[] getBytes() throws IOException {
return imgContent;
}
@Override
public InputStream getInputStream() throws IOException {
return new ByteArrayInputStream(imgContent);
}
@Override
public void transferTo(File dest) throws IOException, IllegalStateException {
new FileOutputStream(dest).write(imgContent);
}
public static MultipartFile base64ToMultipart(String base64) {
try {
String[] baseStrs = base64.split(",");
BASE64Decoder decoder = new BASE64Decoder();
byte[] b = new byte[0];
b = decoder.decodeBuffer(baseStrs[1]);
for(int i = 0; i < b.length; ++i) {
if (b[i] < 0) {
b[i] += 256;
}
}
return new BASE64DecodedMultipartFile(b, baseStrs[0]);
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
public static String getBase64(String path){
File file = new File(path);
String base64 = null;
try {
BufferedImage image = ImageIO.read(file);
Integer width = image.getWidth();
Integer height = image.getHeight();
System.out.println("宽:" + width + " 高:"+height);
//输出流
ByteArrayOutputStream stream = new ByteArrayOutputStream();
ImageIO.write(image, "png", stream);
base64 = Base64.encode(stream.toByteArray());
System.out.println(base64);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return base64;
}
}
验证:
public static void main(String[] args) {
String outPath = "d:/codes/abc1.png";
String baseImg = BASE64DecodedMultipartFile.getBase64(outPath);
//这个地方那个一定要特别注意,必须要加上这个开头解析,不同的文件/图片base64都不一样的
baseImg = "data:image/png;base64,"+baseImg;
System.out.println("base图片:"+baseImg);
//成功转成
MultipartFile multipartFile = BASE64DecodedMultipartFile.base64ToMultipart(baseImg);
}