base64图片转成MultipartFile格式

/**
*  base64字符串转成MultipartFile格式
* @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;
	}
}

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import org.springframework.web.multipart.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);
    }
}