Java将base64转成MultipartFile

可以使用Base64解码将base64字符串转换为字节数组，然后使用MultipartFile的实现类ByteArrayMultipartFile将字节数组转换为MultipartFile对象。以下是示例代码： ```java import org.springframework.web.multipart.MultipartFile; import org.springframework.web.multipart.commons.CommonsMultipartFile; import org.springframework.web.multipart.support.ByteArrayMultipartFileEditor; import java.io.IOException; import java.util.Base64; public class Base64ToMultipartFile { public static MultipartFile base64ToMultipart(String base64) throws IOException { byte[] bytes = Base64.getDecoder().decode(base64); return new ByteArrayMultipartFile(bytes, "fileName"); } private static class ByteArrayMultipartFile implements MultipartFile { private final byte[] bytes; private final String name; public ByteArrayMultipartFile(byte[] bytes, String name) { this.bytes = bytes; this.name = name; } @Override public String getName() { return name; } @Override public String getOriginalFilename() { return name; } @Override public String getContentType() { return "application/octet-stream"; } @Override public boolean isEmpty() { return bytes == null || bytes.length == 0; } @Override public long getSize() { return bytes.length; } @Override public byte[] getBytes() throws IOException { return bytes; } @Override public InputStream getInputStream() throws IOException { return new ByteArrayInputStream(bytes); } @Override public void transferTo(File file) throws IOException, IllegalStateException { new FileOutputStream(file).write(bytes); } } } ```