java base64 转 MultipartFile

package com.xpf.common.utils;

import org.springframework.web.multipart.MultipartFile;
import sun.misc.BASE64Decoder;

import java.io.*;

/**
 * @Title:MultipartFileUtils
 * @Package:com.xpf.common.utils
 * @Author: xiapf
 * @Date:2019/12/18
 * @Descrption:
 */
public class MultipartFileUtils {

    /**
     * base64转MultipartFile
     * @param base64
     * @return
     */
    public static MultipartFile base64ToMultipart(String base64) {
        try {
            String[] baseStrs = base64.split(",");
            BASE64Decoder decoder = new BASE64Decoder();
            byte[] b;
            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;
        }
    }
}

           

package com.xpf.common.utils;

import org.springframework.web.multipart.MultipartFile;

import java.io.*;

/**
 * @Title:Base64DecodedMultipartFile
 * @Package:com.xpf.common.utils
 * @Author: xiapf
 * @Date:2019/12/18
 * @Descrption:
 */
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);
    }

}

           

参考：https://www.jianshu.com/p/0ee9b1a3b3e0