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JAVA 根据Url把多文件打包成ZIP下载实例

2019年07月19日  | 移动技术网IT编程  | 我要评论

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

以上所述是小编给大家介绍的java 根据url把多文件打包成zip下载，希望对大家有所帮助

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