JAVA 根据Url把多文件打包成ZIP下载实例

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压缩文件代码工具类：

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; } }

控制层代码:

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”);包装zip文件名不发生乱码。

2.一定要注意，否则会发生下载下来的压缩包无法解压。在给OutputStream 传值之前，一定要先把ZipOutputStream的流给关闭了！

总结