Spring实现文件下载接口

Spring实现文件下载接口，response带文件名和文件格式。

DownloadController

import org.apache.tomcat.util.http.fileupload.IOUtils;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

@RestController
public class DownloadController {

    @GetMapping("/download/video")
    public void getDownload(HttpServletRequest request, HttpServletResponse response) {

        // Get your file stream from wherever.
        String fullPath = "E:\\Project\\Java\\demo\\demo\\src\\main\\resources\\static\\test.mp4";
        File downloadFile = new File(fullPath);

        ServletContext context = request.getServletContext();

        // get MIME type of the file
        String mimeType = context.getMimeType(fullPath);
        if (mimeType == null) {
            // set to binary type if MIME mapping not found
            mimeType = "application/octet-stream";
            System.out.println("context getMimeType is null");
        }
        System.out.println("MIME type: " + mimeType);

        // set content attributes for the response
        response.setContentType(mimeType);
        response.setContentLength((int) downloadFile.length());

        // set headers for the response
        String headerKey = "Content-Disposition";
        String headerValue = String.format("attachment; filename=\"%s\"",
                downloadFile.getName());
        response.setHeader(headerKey, headerValue);

        // Copy the stream to the response's output stream.
        try {
            InputStream myStream = new FileInputStream(fullPath);
            IOUtils.copy(myStream, response.getOutputStream());
            response.flushBuffer();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}