package com.common.core.utils;
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import org.springframework.web.multipart.MultipartFile;
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import sun.misc.BASE64Decoder;
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import java.io.*;
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/**
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* @Author holfeng
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* @Date 15:21 10/02/2022
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* @Version 1.0
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**/
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public class BASE64DecodedMultipartFile implements MultipartFile {
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private byte[] fileContent;
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private String header;
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public BASE64DecodedMultipartFile(byte[] fileContent, String header) {
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this.fileContent = fileContent;
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this.header = header.split(";")[0];
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}
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@Override
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public String getName() {
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return header.split("/")[1];
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}
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@Override
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public String getOriginalFilename() {
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return header.split("/")[1];
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}
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@Override
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public String getContentType() {
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return header.split(":")[1];
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}
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@Override
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public boolean isEmpty() {
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return fileContent == null || fileContent.length == 0;
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}
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@Override
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public long getSize() {
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return fileContent.length;
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}
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@Override
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public byte[] getBytes() throws IOException {
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return fileContent;
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}
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@Override
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public InputStream getInputStream() throws IOException {
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return new ByteArrayInputStream(fileContent);
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}
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@Override
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public void transferTo(File dest) throws IOException, IllegalStateException {
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FileOutputStream stream=null;
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try {
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stream = new FileOutputStream(dest);
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stream.write(fileContent);
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}catch (Exception e){
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throw e;
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}finally {
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if(stream!=null)stream.close();
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}
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}
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public static MultipartFile base64ToMultipart(String base64) throws IOException {
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String[] baseStrs = base64.split(",");
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BASE64Decoder decoder = new BASE64Decoder();
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byte[] b = new byte[0];
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b = decoder.decodeBuffer(baseStrs[1]);
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for (int i = 0; i < b.length; ++i) {
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if (b[i] < 0) {
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b[i] += 256;
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}
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}
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return new BASE64DecodedMultipartFile(b, baseStrs[0]);
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}
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}
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