JAVA 根据Url把多文件打包成ZIP下载

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！