package cn.lili.common.utils;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.web.multipart.MultipartFile;
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import java.io.*;
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import java.util.Base64;
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import java.util.Base64.Decoder;
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/**
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* base64转为multipartFile工具类
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*
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* @author Chopper
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*/
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@Slf4j
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public class Base64DecodeMultipartFile implements MultipartFile {
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private final byte[] imgContent;
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private final String header;
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public Base64DecodeMultipartFile(byte[] imgContent, String header) {
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this.imgContent = imgContent;
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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 System.currentTimeMillis() + Math.random() + "." + header.split("/")[1];
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}
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@Override
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public String getOriginalFilename() {
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return System.currentTimeMillis() + (int) Math.random() * 10000 + "." + 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 imgContent == null || imgContent.length == 0;
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}
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@Override
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public long getSize() {
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return imgContent.length;
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}
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@Override
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public byte[] getBytes() throws IOException {
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return imgContent;
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}
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@Override
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public InputStream getInputStream() {
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return new ByteArrayInputStream(imgContent);
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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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OutputStream stream = null;
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try {
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stream = new FileOutputStream(dest);
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stream.write(imgContent);
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} catch (IOException e) {
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log.error("transferTo错误", e);
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} finally {
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assert stream != null;
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stream.close();
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}
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}
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public static MultipartFile base64Convert(String base64) {
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String[] baseStrs = base64.split(",");
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Decoder decoder = Base64.getDecoder();
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byte[] b = decoder.decode(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 Base64DecodeMultipartFile(b, baseStrs[0]);
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}
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public static InputStream base64ToInputStream(String base64) {
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ByteArrayInputStream stream = null;
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try {
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byte[] bytes = Base64.getDecoder().decode(base64);
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stream = new ByteArrayInputStream(bytes);
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} catch (Exception e) {
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log.error("base64ToInputStream错误", e);
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}
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return stream;
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}
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public static String inputStreamToStream(InputStream in) {
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byte[] data = null;
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//读取图片字节数组
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try {
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ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
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byte[] buff = new byte[100];
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int rc = 0;
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while ((rc = in.read(buff, 0, 100)) > 0) {
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swapStream.write(buff, 0, rc);
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}
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data = swapStream.toByteArray();
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} catch (IOException e) {
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log.error("转码错误", e);
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} finally {
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if (in != null) {
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try {
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in.close();
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} catch (IOException e) {
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log.error("inputStreamToStream错误", e);
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}
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}
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}
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return Base64.getEncoder().encodeToString(data);
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}
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}
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