Java如何實作根據Url將多檔案打包成ZIP下載的實例分享

這篇文章主要介紹了JAVA 根據Url把多檔案打包成ZIP下載的相關資料,需要的朋友可以參考下

壓縮檔案程式碼工具類別：

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;
 }
}

控制層程式碼:

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);
  }
 }
 }

注意：

1. String filename = new String(“xx.zip”.getBytes(“UTF-8”), “ISO8859-1”); 包裝zip檔名不發生亂碼。

2.一定要注意，否則會發生下載下來的壓縮包無法解壓縮。在給OutputStream 傳值之前，一定要先把ZipOutputStream的流給關閉了！

總結

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