springboot单文件下载和多文件压缩zip下载的实现

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;
  }

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