單檔案下載

//下載單個檔案
public void downloadFile(HttpServletResponse response){
    String path = "D:\test\ce\1.txt"
    File file = new File(path);
    if(file.exists()){

      String fileName = file.getName();
      response.setHeader("Content-Disposition","attachment;fileName=" + fileName);
      download(response,file);

    }
  }


public void download(HttpServletResponse response,File file){


    FileInputStream fis = null;
    BufferedInputStream bis = null;
    OutputStream os = null;

    try {
      os = response.getOutputStream();
      fis = new FileInputStream(file);
      bis = new BufferedInputStream(fis);
      byte[] buffer = new byte[bis.available()];
      int i = bis.read(buffer);
      while(i != -1){
        os.write(buffer,i);
        i = bis.read(buffer);
      }

    } catch (Exception e) {
      e.printStackTrace();
    }
    try {
      bis.close();
      fis.close();
      os.close();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }

多檔案壓縮下載

//多個檔案，壓縮成zip後下載
public void downloadMoreFile(HttpServletResponse response) {

    
    String test1= "D:\test\ce\1.txt";
    String test2= "D:\test\ce\2.txt";

    File tfile= new File(test1);
    File cfile= new File(test2);

    List<File> files = new ArrayList<>();
    files.add(tfile);
    files.add(cfile);
    if (tfile.exists() && cfile.exists()) {

      String zipTmp = "D:\test\ce\1.zip";
      zipd(zipTmp,files,response);

     
    }
  }

public void zipd(String zipTmp,List<File> files,HttpServletResponse response){
    File zipTmpFile = new File(zipTmp);
    try {
      if (zipTmpFile.exists()) {
        zipTmpFile.delete();
      }
      zipTmpFile.createNewFile();

      response.reset();
      // 建立檔案輸出流
      FileOutputStream fous = new FileOutputStream(zipTmpFile);
      ZipOutputStream zipOut = new ZipOutputStream(fous);
      zipFile(files,zipOut);
      zipOut.close();
      fous.close();
      downloadZip(zipTmpFile,response);
    } catch (IOException e) {
      e.printStackTrace();
    }
  }

 
  //files打成壓縮包
  public void zipFile(List files,ZipOutputStream outputStream) {
    int size = files.size();
    for (int i = 0; i < size; i++) {
      File file = (File) files.get(i);
      zipFile(file,outputStream);
    }
  }

 
  public void zipFile(File inputFile,ZipOutputStream ouputStream) {
    try {
      if (inputFile.exists()) {
        if (inputFile.isFile()) {
          FileInputStream IN = new FileInputStream(inputFile);
          BufferedInputStream bins = new BufferedInputStream(IN,512);
          ZipEntry entry = new ZipEntry(inputFile.getName());
          ouputStream.putNextEntry(entry);

          int nNumber;
          byte[] buffer = new byte[512];
          while ((nNumber = bins.read(buffer)) != -1) {
            ouputStream.write(buffer,nNumber);
          }
   
          bins.close();
          IN.close();
        } else {
          try {
            File[] files = inputFile.listFiles();
            for (int i = 0; i < files.length; i++) {
              zipFile(files[i],ouputStream);
            }
          } catch (Exception e) {
            e.printStackTrace();
          }
        }
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

public static HttpServletResponse downloadZip(File file,HttpServletResponse response) {
    if (file.exists() == false) {
      System.out.println("待壓縮的檔案目錄：" + file + "不存在.");
    } else {
      try {
        // 以流的形式下載檔案。
        InputStream fis = new BufferedInputStream(new FileInputStream(file.getPath()));
        byte[] buffer = new byte[fis.available()];
        fis.read(buffer);
        fis.close();
        // 清空response
        response.reset();

        OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
        response.setContentType("application/octet-stream");

        // 如果輸出的是中文名的檔案，在此處就要用URLEncoder.encode方法進行處理
        response.setHeader("Content-Disposition","attachment;filename=" + new String(file.getName().getBytes("GB2312"),"ISO8859-1"));
        toClient.write(buffer);
        toClient.flush();
        toClient.close();
      } catch (Exception ex) {
        ex.printStackTrace();
      } finally {
        try {
          File f = new File(file.getPath());
          f.delete();
        } catch (Exception e) {
          e.printStackTrace();
        }
      }
    }
    return response;
  }

到此這篇關於springboot單檔案下載和多檔案壓縮zip下載的實現的文章就介紹到這了,更多相關springboot檔案壓縮下載內容請搜尋我們以前的文章或繼續瀏覽下面的相關文章希望大家以後多多支援我們！