java

关注公众号 jb51net

关闭
首页 > 软件编程 > java > springboot文件压缩下载

springboot单文件下载和多文件压缩zip下载的实现

作者:二十同学

这篇文章主要介绍了springboot单文件下载和多文件压缩zip下载的实现,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友们下面随着小编来一起学习学习吧

单文件下载

//下载单个文件
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, 0, i);
        i = bis.read(buffer);
      }

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

多文件压缩下载

//多个文件,压缩成zip后下载
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();
      // 创建文件输出流
      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打成压缩包
  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, 0, 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("待压缩的文件目录:" + file + "不存在.");
    } else {
      try {
        // 以流的形式下载文件。
        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");

        // 如果输出的是中文名的文件,在此处就要用URLEncoder.encode方法进行处理
        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;
  }

到此这篇关于springboot单文件下载和多文件压缩zip下载的实现的文章就介绍到这了,更多相关springboot文件压缩下载内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!

您可能感兴趣的文章:
阅读全文