Example sharing of how Java can package multiple files into ZIP downloads based on Url

This article mainly introduces the relevant information about JAVA packaging multiple files into ZIP downloads based on Url. Friends in need can refer to the

Compressed file code tool class:

public class UrlFilesToZip {
 private static final Logger logger = LoggerFactory.getLogger(UrlFilesToZip.class);
 //根据文件链接把文件下载下来并且转成字节码
 public byte[] getImageFromURL(String urlPath) {
  byte[] data = null;
  InputStream is = null;
  HttpURLConnection conn = null;
  try {
   URL url = new URL(urlPath);
   conn = (HttpURLConnection) url.openConnection();
   conn.setDoInput(true);
   // conn.setDoOutput(true);
   conn.setRequestMethod("GET");
   conn.setConnectTimeout(6000);
   is = conn.getInputStream();
   if (conn.getResponseCode() == 200) {
    data = readInputStream(is);
   } else {
    data = null;
   }
  } catch (MalformedURLException e) {
   logger.error("MalformedURLException", e);
  } catch (IOException e) {
   logger.error("IOException", e);
  } finally {
   try {
    if (is != null) {
     is.close();
    }
   } catch (IOException e) {
    logger.error("IOException", e);
   }
   conn.disconnect();
  }
  return data;
 }
 public byte[] readInputStream(InputStream is) {
  ByteArrayOutputStream baos = new ByteArrayOutputStream();
  byte[] buffer = new byte[1024];
  int length = -1;
  try {
   while ((length = is.read(buffer)) != -1) {
    baos.write(buffer, 0, length);
   }
   baos.flush();
  } catch (IOException e) {
   logger.error("IOException", e);
  }
  byte[] data = baos.toByteArray();
  try {
   is.close();
   baos.close();
  } catch (IOException e) {
   logger.error("IOException", e);
  }
  return data;
 }
}

Control layer Code:

public void filesdown(HttpServletResponse response){
 try {
   String filename = new String("xx.zip".getBytes("UTF-8"), "ISO8859-1");//控制文件名编码
   ByteArrayOutputStream bos = new ByteArrayOutputStream();
   ZipOutputStream zos = new ZipOutputStream(bos);
   UrlFilesToZip s = new UrlFilesToZip();
   int idx = 1;
   for (String oneFile : urls) {
    zos.putNextEntry(new ZipEntry("profile" + idx);
    byte[] bytes = s.getImageFromURL(oneFile);
    zos.write(bytes, 0, bytes.length);
    zos.closeEntry();
    idx++;
   }
   zos.close();
   response.setContentType("application/force-download");// 设置强制下载不打开
   response.addHeader("Content-Disposition", "attachment;fileName=" + filename);// 设置文件名
   OutputStream os = response.getOutputStream();
   os.write(bos.toByteArray());
   os.close();
  } catch (FileNotFoundException ex) {
   logger.error("FileNotFoundException", ex);
  } catch (Exception ex) {
   logger.error("Exception", ex);
  }
 }
 }

Note:

1. String filename = new String(“xx.zip”.getBytes(“UTF-8”), “ISO8859-1”); The package zip file name will not be garbled.

2. Be careful, otherwise the downloaded compressed package may not be decompressed. Before passing a value to OutputStream, you must first close the ZipOutputStream stream!

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