前言

在使用SpringCloud的feign组件过程中, 我们想传递一个文件到服务提供者. 但是我们只有byte[], 这是就需要手动创建MultipartFile

实现接口MultipartFile

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 GYMultipartFile implements MultipartFile{
    
    private String contentType;
    
    private String originalFilename;
    
    private String name;
    
    private byte[] imgContent;

    public GYMultipartFile(String name, String originalFilename, String contentType, byte[] imgContent){
        this.imgContent = imgContent;
        this.name = name;
        this.originalFilename = originalFilename;
        this.contentType = contentType;
    }

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

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

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

    @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
    @SuppressWarnings("resource")
    public void transferTo(File dest) throws IOException, IllegalStateException { 
        new FileOutputStream(dest).write(imgContent);
    }
}

注意事项

1. 上面的name必须填写正确, name表示这个文件在表单中的名字