关于org.apache.commons.net.ftp.FTPClient建立FTP客户端的问题

建立连接正常，

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private FTPClient f = new FTPClient();

try {

f.connect("192.168.0.35");

f.login("sa", "sa");

System.out.println("已经连接至FTP服务器");

} catch (Exception e) {

e.printStackTrace();

｝

建立连接后执行

FTPFile[] ff=f.listFiles();

取当前路径下的所有文件列表出现异常，异常如下：

org.apache.commons.net.ftp.parser.ParserInitializationException: Unknown parser type: Transfer complete.

at org.apache.commons.net.ftp.parser.DefaultFTPFileEntryParserFactory.createFileEntryParser(DefaultFTPFileEntryParserFactory.java:118)

at org.apache.commons.net.ftp.FTPClient.initiateListParsing(FTPClient.java:2358)

at org.apache.commons.net.ftp.FTPClient.listFiles(FTPClient.java:2141)

at org.apache.commons.net.ftp.FTPClient.listFiles(FTPClient.java:2188)