Spring Boot file download

1. Download the file class

Import javax.servlet.http.HttpServletResponse;
 Import java.io. * ; 

public  class DownloadUtil { 

    public  boolean the FileDownload (HttpServletResponse the Response, String filePath, String fileName)
         throws UnsupportedEncodingException { 
        
        File File = new new File (filePath); // create download true path object file, a parameter file 
        iF (File.Exists ()) { // determines whether a file exists 
            the response.setContentType ( "file application / vnd.ms-Excel; charset = UTF-. 8" ); 
            response.setCharacterEncoding ( " . 8-UTF " ); 
            response.setHeader ("Content-Disposition", "attachment;fileName=" +   java.net.URLEncoder.encode(fileName,"UTF-8"));
            byte[] buffer = new byte[1024];
            FileInputStream fis = null; //文件输入流
            BufferedInputStream bis = null;

            OutputStream os = null; //输出流
            try {
                os = response.getOutputStream();
                fis = new FileInputStream(file);
                bis = new BufferedInputStream(fis);
                int i = bis.read(buffer);
                while(i != -1){
                    os.write(buffer);
                    i = bis.read(buffer);
                }

            } catch (Exception e) {
                e.printStackTrace();
                return false;
            }
            try {
                bis.close();
                fis.close();
            } catch (IOException e) {
                e.printStackTrace();
                return false;
            }
        }
        return true;
    }

 

2.  Download a tag

< A TH: the href = "@ {/ downloads / fileName} {} + $ + $ +} {filePath 'filePath =?'" > Download File </ A >

filePath is the real path, because the symbol path with RESTful API style conflict, so take mass participation of the traditional way of a label

 

3. Controller

/**
     * 测试文件下载
     * @param fileName
     * @param filePath
     * @param response
     * @return
     * @throws UnsupportedEncodingException
     */
@GetMapping("/download/{fileName}")
public String testDownload(@PathVariable("fileName") String fileName,String filePath,HttpServletResponse response) throws UnsupportedEncodingException {

    System.out.println("==>开始文件下载！");

    DownloadUtil downloadUtil = new DownloadUtil();

    downloadUtil.fileDownload(response,filePath,fileName);

    return null;
}