file轉MultipartFile的時候會用到MockMultipartFile

當匯入spring-test依賴的時候 會跟某些依賴衝突

新增依賴：

<dependency>
    <groupId>org.mockito</groupId>
    <artifactId>mockito-core</artifactId>
    <version>2.5.5</version>
    <scope>test</scope>
</dependency>

解決方法：為避免衝突不能使用，所以需要重寫一個類去實現MultipartFile介面

& 直接用MockMultipartFile的原始碼

import org.springframework.util.FileCopyUtils;
import org.springframework.web.multipart.MultipartFile;

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

public class MultipartFileConfig implements MultipartFile {
    private final String name;

    private final String originalFilename;

    private final String contentType;

    private final byte[] content;

    /**
     * Create a new MultipartFileDto with the given content.
     *
     * @param name    the name of the file
     * @param content the content of the file
     */
    public MultipartFileConfig(String name, byte[] content) {
        this(name, "", null, content);
    }

    /**
     * Create a new MultipartFileDto with the given content.
     *
     * @param name          the name of the file
     * @param contentStream the content of the file as stream
     * @throws IOException if reading from the stream failed
     */
    public MultipartFileConfig(String name, InputStream contentStream) throws IOException {
        this(name, "", null, FileCopyUtils.copyToByteArray(contentStream));
    }

    /**
     * Create a new MultipartFileDto with the given content.
     *
     * @param name             the name of the file
     * @param originalFilename the original filename (as on the client's machine)
     * @param contentType      the content type (if known)
     * @param content          the content of the file
     */
    public MultipartFileConfig(String name, String originalFilename, String contentType, byte[] content) {
        this.name = name;
        this.originalFilename = (originalFilename != null ? originalFilename : "");
        this.contentType = contentType;
        this.content = (content != null ? content : new byte[0]);
    }

    /**
     * Create a new MultipartFileDto with the given content.
     *
     * @param name             the name of the file
     * @param originalFilename the original filename (as on the client's machine)
     * @param contentType      the content type (if known)
     * @param contentStream    the content of the file as stream
     * @throws IOException if reading from the stream failed
     */
    public MultipartFileConfig(String name, String originalFilename, String contentType, InputStream contentStream)
            throws IOException {

        this(name, originalFilename, contentType, FileCopyUtils.copyToByteArray(contentStream));
    }

    @Override
    public String getName() {
        return this.name;
    }

    @Override
    public String getOriginalFilename() {
        return this.originalFilename;
    }

    @Override
    public String getContentType() {
        return this.contentType;
    }

    @Override
    public boolean isEmpty() {
        return (this.content.length == 0);
    }

    @Override
    public long getSize() {
        return this.content.length;
    }

    @Override
    public byte[] getBytes() throws IOException {
        return this.content;
    }

    @Override
    public InputStream getInputStream() throws IOException {
        return new ByteArrayInputStream(this.content);
    }

    @Override
    public void transferTo(File dest) throws IOException, IllegalStateException {
        FileCopyUtils.copy(this.content, dest);
    }
}

file轉MultipartFile轉換方法：

import org.apache.http.entity.ContentType;

/*
file轉MultipartFile
 */
private MultipartFile getMultipartFile(File file){
    FileInputStream fileInputStream = null;
    MultipartFile multipartFile = null;
    try {
        fileInputStream = new FileInputStream(file);
        multipartFile = new MultipartFileConfig(file.getName(),file.getName(),
                ContentType.APPLICATION_OCTET_STREAM.toString(),fileInputStream);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return multipartFile;
}