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ruoyi-common/src/main/java/com/ruoyi/common/utils/file/Base64ToMultipartFile.java

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+package com.ruoyi.common.utils.file;
+
+import org.springframework.web.multipart.MultipartFile;
+import org.apache.commons.io.IOUtils;
+import java.io.*;
+import java.util.Base64;
+
+public class Base64ToMultipartFile implements MultipartFile {
+
+    private final byte[] fileContent;
+    private final String fileName;
+    private final String contentType;
+
+    public Base64ToMultipartFile(String base64, String fileName, String contentType) {
+        this.fileContent = Base64.getDecoder().decode(base64);
+        this.fileName = fileName;
+        this.contentType = contentType;
+    }
+
+    @Override
+    public String getName() {
+        return fileName;
+    }
+
+    @Override
+    public String getOriginalFilename() {
+        return fileName;
+    }
+
+    @Override
+    public String getContentType() {
+        return contentType;
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return fileContent == null || fileContent.length == 0;
+    }
+
+    @Override
+    public long getSize() {
+        return fileContent.length;
+    }
+
+    @Override
+    public byte[] getBytes() throws IOException {
+        return fileContent;
+    }
+
+    @Override
+    public InputStream getInputStream() throws IOException {
+        return new ByteArrayInputStream(fileContent);
+    }
+
+    @Override
+    public void transferTo(File dest) throws IOException, IllegalStateException {
+        try (FileOutputStream fos = new FileOutputStream(dest)) {
+            fos.write(fileContent);
+        }
+    }
+}