前端Base64 后台转为MultipartFile

╰+攻爆jí腚メ 2021-11-22 06:40 651阅读 0赞

package com.mz.party_build.manager_center.util;
    
    import org.springframework.web.multipart.MultipartFile;
    import sun.misc.BASE64Decoder;
    
    import java.io.*;
    
    /**
     * base64转MultipartFile
     */
    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);
        }
    
        /**
         * base64转MultipartFile文件
         *
         * @param base64
         * @return
         */
        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;
            }
        }
    
    }