java FTPClient下载文件（含中文）

1、前言

项目需使用ftp下载服务器上的文件

2、使用

pom

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

代码

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";
        //下载远程文件夹下的 中文 文件
        String remoteFileName = "/1/津巴多普通心理学.pdf";
        String fileName = "津巴多普通心理学.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("没有找到" + remoteFileName + "---该文件");
                localFile.delete();
            } else {
                System.out.println("=================== save success");
            }
            os.close();
            ftpClient.logout();
            ftpClient.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

3、参考

怎样在win10上搭建FTP服务器？

解决FTPClient上传下载中文文件名或路径与FTPClient下载成功文件0KB问题

java FTPClient changeWorkingDirectory()方法切换当前工作目录

java下载FTP服务器的目录或文件名有中文时导致，下载失败的问题