ftp 不能在 java 中正确下载文件? [英] ftp doesn't download the file properly in java?

问题描述

当我使用以下代码下载文件时，它只是将文件写入本地目标，但文件大小全部为零.谁能说出为什么会发生这种情况以及如何解决?

When i download file with following code it just write the file to destination on local but file size are all zero. Can anybody say Why this happen and how to fix it?

import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import java.io.FileOutputStream;
import java.io.IOException;

public class FtpDownload {
public static void main(String[] args) {
    FTPClient client = new FTPClient();
    FileOutputStream fos = null;
    String filename = "config.zip";
    try {
        client.connect("ftpsrv");
        client.login("user", "user");

        for (FTPFile file : client.listFiles()) {
            filename = "C:\tmp\user\" + file.getName();
            if (file.isFile()) {
                fos = new FileOutputStream(filename);
                client.retrieveFile(filename, fos);
                System.out.println(file.getName());
            } else if (file.isDirectory()) {
                System.out.println("directory: " + file.getName());
            }
        }

    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        try {
            if (fos != null) {
                fos.close();
            }
            client.disconnect();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}
}

推荐答案

在 Apache 文档中搜索后，我得出结论 BINARY_FILE_TYPE 尚未解决.我添加了以下代码，一切正常.感谢所有提供帮助的人.

after searching in the Apache documentation i come to conclusion that BINARY_FILE_TYPE is not yet settled. i have add following code and everything is OK. thanks to all of you that did help.

try {
    client.connect(ftpServer);
    client.login(username, password);
    // following line fixed my zip file corruption issue.
    client.setFileType(FTP.BINARY_FILE_TYPE);

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