base64ToMutipartFile(Base64转换为MutipartFile)

package com.education.common.utils;


import org.springframework.web.multipart.MultipartFile;
import sun.misc.BASE64Decoder;
import java.io.*;

/**
 * @author: liftsail
 * @create: 2022/6/20 9:41
 **/
public class MultipartFileUtils {

    public  static MultipartFile base64MutipartFile(String imgStr){
        try {
            String [] baseStr = imgStr.split(",");
            BASE64Decoder base64Decoder = new BASE64Decoder();
            byte[] b =  new byte[0];
            b = base64Decoder.decodeBuffer(baseStr[1]);
            for(int i = 0; i < b.length; ++i) {
                if (b[i] < 0) {
                    b[i] += 256;
                }
            }
            return new Base64DecodedMultipartFile(b, baseStr[0]);
        }catch (Exception e){
            e.printStackTrace();
            return null;
        }
    }

    public static String getURLDecoderString(String str) {
        String result = "";
        if (null == str) {
            return "";
        }
        try {
            result = java.net.URLDecoder.decode(str, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return result;
    }
}

package com.education.common.utils;

import org.springframework.web.multipart.MultipartFile;

import java.io.*;

/**
 * @Title:Base64DecodedMultipartFile
 */
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() {
        return imgContent;
    }

    @Override
    public InputStream getInputStream() {
        return new ByteArrayInputStream(imgContent);
    }

    @Override
    public void transferTo(File dest) throws IOException, IllegalStateException {
        new FileOutputStream(dest).write(imgContent);
    }

}