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Java FTP 文件上傳下載：中文亂碼、多文件、慢速度解決方案

編輯：Java 相關知識

注意：原文內容與標題不符，實為桶排序算法重複

下面提供 FTP 實戰核心代碼模板：

Apache Commons Net FTP 工具類

public class FtpUtils {
    private FTPClient ftp = new FTPClient();

    public void connect(String host, int port, String user, String pass) throws IOException {
        ftp.connect(host, port);
        ftp.login(user, pass);
        ftp.setControlEncoding("UTF-8");        // 解決中文目錄亂碼
        ftp.setFileType(FTP.BINARY_FILE_TYPE);
        ftp.enterLocalPassiveMode();            // 被動模式穿透防火牆
        ftp.setBufferSize(1024 * 1024);         // 1MB 緩衝提速
    }

    public boolean upload(String localPath, String remoteDir, String fileName) {
        try (FileInputStream in = new FileInputStream(localPath)) {
            ftp.changeWorkingDirectory(remoteDir);
            return ftp.storeFile(new String(fileName.getBytes("UTF-8"), "ISO-8859-1"), in);
        } catch (IOException e) { return false; }
    }

    public boolean download(String remotePath, String localDir, String fileName) {
        try (FileOutputStream out = new FileOutputStream(localDir + File.separator + fileName)) {
            return ftp.retrieveFile(new String(remotePath.getBytes("UTF-8"), "ISO-8859-1"), out);
        } catch (IOException e) { return false; }
    }

    public void disconnect() {
        try { if (ftp.isConnected()) ftp.logout(); } catch (IOException ignored) {}
    }
}