java文件下载

@RequestMapping(value = "/downFile/downBusLine")
    @ResponseBody
    public void downBusLine(@RequestParam String filename, HttpServletResponse response) {
        String filepath = busLinePath;
        FileDownload.fileDownload(response, filename, filepath);
    }

package org.jeecg.common.util;

import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;

public class FileDownload {

    public static void fileDownload(HttpServletResponse response,String filename,String filepath){
        File file = new File(filepath+filename);
        // 如果文件存在，则进行下载
        if (file.exists()) {
            response.setHeader("content-type", "application/octet-stream");
            response.setContentType("application/octet-stream");
            response.setHeader("Content-Disposition", "attachment;fileName=" +  URLEncoder.encode(filename) );
            byte[] buffer = new byte[1024];
            FileInputStream fis = null;
            BufferedInputStream bis = null;
            try {
                fis = new FileInputStream(file);
                bis = new BufferedInputStream(fis);
                OutputStream os = response.getOutputStream();
                int i = bis.read(buffer);
                while (i != -1) {
                    os.write(buffer, 0, i);
                    i = bis.read(buffer);
                }
                System.out.println("Download  successfully!");

            } catch (Exception e) {
                System.out.println("Download  failed!");
            } finally {
                if (bis != null) {
                    try {
                        bis.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                if (fis != null) {
                    try {
                        fis.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }
}