Ftp實現文件的上傳下載(commons-net依賴)（解決ftp上傳下載文件亂碼）

首先我們引入commons-net依賴，這是個基於Socket的ftp依賴，API在
http://commons.apache.org/proper/commons-net/apidocs/index.html

 <dependency>
			<groupId>commons-net</groupId>
			<artifactId>commons-net</artifactId>
			<version>3.5</version>
</dependency>

登錄方式爲

//驗證登錄
        try {
            FTPClient ftp = new FTPClient();
            ftp.connect(ip, port);
            System.out.println(ftp.login(name, pwd));
            ftp.setFileType(FTP.BINARY_FILE_TYPE);
            ftp.setCharset(Charset.forName("UTF-8"));
            ftp.setControlEncoding("UTF-8");

        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

亂碼原因是字符編碼問題，在ftpcilent處定義下就好

ftp.setFileType(FTP.BINARY_FILE_TYPE);
ftp.setCharset(Charset.forName(“UTF-8”));
ftp.setControlEncoding(“UTF-8”);
獲取文件列表方式：

FTPClient f = new FTPClient();
f.connect(server);
f.login(username, password);
FTPFile[] files = f.listFiles(directory);

FTPClient f = new FTPClient();
f.connect(server);
f.login(username,password);
FTPListParseEngine engine =
        f.initiateListParsing("com.whatever.YourOwnParser", directory);
// FTPListParseEngine engine = f.initiateListParsing(directory);
while(engine.hasNext()){
    FTPFile[] files = engine.getNext(25);  // "page size" you want
    //do whatever you want with these files, display them, etc.
    //expensive FTPFile objects not created until needed.
}

上傳：

public void putFile(File file) {
        try {
            OutputStream os = ftp.storeFileStream(file.getName());
            FileInputStream fis = new FileInputStream(file);

            byte[] b = new byte[1024];
            int len = 0;
            while ((len = fis.read(b)) != -1) {
                os.write(b, 0, len);
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
}


public void putFiles(File srcFile) {
        try {
            if (!srcFile.exists()) {
                srcFile.mkdirs();
            }
            for (File file : srcFile.listFiles()) {
                if (file.isDirectory()) {
                    putFiles(file);
                } else {
                    putFile(file);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
}

下載：

public void getFile(String fileName, File file) {
        try {
            //將ftp的file路徑下的"fileName"文件下載到本地目錄文件夾下面，並重命名爲"fileName"
            ftp.retrieveFile(fileName, new FileOutputStream(new File(file.getPath() + "\\" + fileName)));
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

public void getFiles() {
        List<String> fileNameList = getFilesName();
        try {
            ReadConfig readConfig = new ReadConfig();
            DateUtil dateUtil = new DateUtil();
            File toFile = new File(readConfig.getTempPath() + "\\" + dateUtil.getDay() + "12");
            if (!toFile.exists()) {
                toFile.mkdirs();
            }
            for (int i = 0; i < fileNameList.size(); i++) {
                getFile(fileNameList.get(i), toFile);
                System.out.println(fileNameList.get(i));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

測試代碼：

//    public static void main(String args[]) {
//        FTPUtil ftpUtil = new FTPUtil("172.18.66.209",18200,"admin","1234-123");
//        ftpUtil.getFilesName();
//        ftpUtil.getFiles();
//        File file = new File("D:\\thundersource\\2020051112");
//        ftpUtil.putFiles(file);
//        ftpUtil.putFile(file);
//        //ftpUtil.putFile();
//        ftpUtil.getFile();
//    }

需要注意的是，當使用org.apache.commons.net.ftp.FTPClient通過協議SSH2進行SFTP連接時會報Could not parse response code.Server Reply: SSH-2.0-OpenSSH_5.3，原因是它不支持這種方式的連接(使用FTPSClient的SSL也是不行的)。，我們需要使用com.jcraft.jsch.JSch提供的SSH解決方法，
詳情請看https://blog.csdn.net/oLengYueHun/article/details/106098501