java FTPClient下載文件（含中文）

1、前言

項目需使用ftp下載服務器上的文件

2、使用

pom

        <dependency>
            <groupId>commons-net</groupId>
            <artifactId>commons-net</artifactId>
            <version>3.6</version>
        </dependency>

代碼

import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPReply;

import java.io.*;

public class FTPTest {
    private static String username = "ftpuser";
    private static String password = "123456";
    private static String ip = "192.168.1.19";
    private static Integer port = 21;

    public static void start() {
        String saveDir = "F:/Program/FTP_Save";
        //下載遠程文件夾下的 中文 文件
        String remoteFileName = "/1/津巴多普通心理學.pdf";
        String fileName = "津巴多普通心理學.pdf";

        // remoteFileName = "/1/2/654321.pcm";
        // fileName = "654321.pcm";

        downloadFtpFile(remoteFileName, saveDir, fileName);
    }

    public static void downloadFtpFile(String remoteFileName, String saveDir, String fileName) {
        FTPClient ftpClient = new FTPClient();
        int reply;
        try {
            ftpClient.connect(ip, port);
            ftpClient.login(username, password);
            reply = ftpClient.getReplyCode();
            if (!FTPReply.isPositiveCompletion(reply)) {
                ftpClient.disconnect();
                return;
            }
            ftpClient.setControlEncoding("UTF-8");
            ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
            ftpClient.enterLocalPassiveMode();

            File localFile = new File(saveDir + File.separatorChar + fileName);
            OutputStream os = new FileOutputStream(localFile);
            //ftp中文名需要iso-8859-1字符
            boolean flag2 = ftpClient.retrieveFile(new String(remoteFileName.getBytes("GBK"), "iso-8859-1"), os);
            if (!flag2) {
                System.out.println("沒有找到" + remoteFileName + "---該文件");
                localFile.delete();
            } else {
                System.out.println("=================== save success");
            }
            os.close();
            ftpClient.logout();
            ftpClient.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

3、參考

怎樣在win10上搭建FTP服務器？

解決FTPClient上傳下載中文文件名或路徑與FTPClient下載成功文件0KB問題

java FTPClient changeWorkingDirectory()方法切換當前工作目錄

java下載FTP服務器的目錄或文件名有中文時導致，下載失敗的問題