文章說明

網上找到說linux安裝ftp，采用vsftpd，在后續的配置中少了一些說明，給我折磨了許久，寫下這篇文章來記錄

Linux安裝vsftpd

命令非常簡單，而且不需要什么額外的配置

yum install vsftpd -y
service vsftpd start
service vsftpd statusvi /etc/vsftpd/vsftpd.conf # 添加下面三行pasv_enable=YES			# 允許被動模式
pasv_min_port=5000     # 被動模式下服務器使用的最小端口
pasv_max_port=5000     # 被動模式下服務器使用的最大端口

上面的幾個命令就是安裝配置vsftpd的步驟，當然如果開啟了防火墻則需要開啟那個端口，然后如果是云服務器也需要在規則里面放開這個端口的通行

改為bash腳本如下

yum install vsftpd -y
echo -e "pasv_enable=YES\npasv_min_port=5000\npasv_max_port=5000" | sudo tee -a /etc/vsftpd/vsftpd.conf
service vsftpd start
service vsftpd status

在安裝并開啟好vsftpd服務后，還需要創建用戶，如jack用戶，采用如下命令

useradd jack
passwd jack

并且為它設置一下密碼，然后就可以了，需要注意的是有一些用戶默認是不可以采用ftp連接的，在 /etc/vsftpd/user_list 里面，采用如下命令可以查看到內容

nl /etc/vsftpd/user_list

1	# vsftpd userlist
2	# If userlist_deny=NO, only allow users in this file
3	# If userlist_deny=YES (default), never allow users in this file, and
4	# do not even prompt for a password.
5	# Note that the default vsftpd pam config also checks /etc/vsftpd/ftpusers
6	# for users that are denied.
7	root
8	bin
9	daemon
10	adm
11	lp
12	sync
13	shutdown
14	halt
15	mail
16	news
17	uucp
18	operator
19	games
20	nobody

Java的工具類

簡單引入依賴

<dependency><groupId>commons-net</groupId><artifactId>commons-net</artifactId><version>3.8.0</version>
</dependency>

工具類代碼

package com.boot.util;import org.apache.commons.net.ftp.FTPClient;import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;public class FtpUtil {private final String host;private final Integer port;private final String username;private final String password;private final String path;public FtpUtil(String host, Integer port, String username, String password, String path) {this.host = host;this.port = port;this.username = username;this.password = password;this.path = path;}private FTPClient getFtpClient() throws IOException {FTPClient ftpClient = new FTPClient();ftpClient.connect(host, port);ftpClient.login(username, password);ftpClient.enterLocalPassiveMode();ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);ftpClient.changeWorkingDirectory(path);return ftpClient;}public void uploadFile(String fileName, InputStream inputStream) throws Exception {FTPClient ftpClient = getFtpClient();ftpClient.storeFile(new String(fileName.getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1), inputStream);ftpClient.disconnect();}public void downloadFile(String fileName, OutputStream outputStream) throws Exception {FTPClient ftpClient = getFtpClient();try (InputStream inputStream = ftpClient.retrieveFileStream(new String(fileName.getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1))) {byte[] buf = new byte[1024];int read;while ((read = inputStream.read(buf)) != -1) {outputStream.write(buf, 0, read);}ftpClient.disconnect();}}public static void main(String[] args) throws Exception {FtpUtil ftpUtil = new FtpUtil("****", 21, "****", "****", "****");ftpUtil.uploadFile("測試文件.txt", Files.newInputStream(Paths.get("C:/file/測試文件.txt")));try (FileOutputStream outputStream = new FileOutputStream("C:/file/測試文件2.txt")) {ftpUtil.downloadFile("測試文件.txt", outputStream);}}}