use commons-net-3.6.jar for FTP connection,

connection is successful, also switch to the target directory, and then print it through ftp.listFiles (); with a length of only 1 strong getName (), but it is .

accessed through the browser, there are many files in the directory. However, using java FTP connection, you cannot get the file name

if (changeDirector(parseFTPReq())) {
    ftp.setFileType(FTPClient.BINARY_FILE_TYPE);
    FTPFile[] ftpFiles = ftp.listFiles();
    for (int i = 0; i < ftpFiles.length; iPP) {
        String fileName = ftpFiles[i].getName();
        System.out.println(fileName);
    }
}

in addition, the access to the page is very slow, does it have anything to do with the network speed?