Java后台返回blob格式的文件流的解决方案

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

public class FileDownloadController {
    
    public void downloadFile(HttpServletResponse response, String filePath) throws IOException {
        File file = new File(filePath);
        if (!file.exists()) {
            response.sendError(HttpServletResponse.SC_NOT_FOUND);
            return;
        }
        
        response.setHeader("Content-Disposition", "attachment; filename=" + file.getName());
        response.setContentType("application/octet-stream");
        
        ServletOutputStream outputStream = response.getOutputStream();
        BufferedInputStream inputStream = new BufferedInputStream(new FileInputStream(file));
        
        byte[] buffer = new byte[4096];
        int bytesRead;
        while ((bytesRead = inputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, bytesRead);
        }
        
        inputStream.close();
        outputStream.flush();
        outputStream.close();
    }
}