Linux安装ftp、Java的FTP上传下载文件工具类

文章说明

网上找到说linux安装ftp，采用vsftpd，在后续的配置中少了一些说明，给我折磨了许久，写下这篇文章来记录

Linux安装vsftpd

命令非常简单，而且不需要什么额外的配置

yum install vsftpd -y
service vsftpd start
service vsftpd statusvi /etc/vsftpd/vsftpd.conf # 添加下面三行pasv_enable=YES			# 允许被动模式
pasv_min_port=5000     # 被动模式下服务器使用的最小端口
pasv_max_port=5000     # 被动模式下服务器使用的最大端口

上面的几个命令就是安装配置vsftpd的步骤，当然如果开启了防火墙则需要开启那个端口，然后如果是云服务器也需要在规则里面放开这个端口的通行

改为bash脚本如下

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

在安装并开启好vsftpd服务后，还需要创建用户，如jack用户，采用如下命令

useradd jack
passwd jack

并且为它设置一下密码，然后就可以了，需要注意的是有一些用户默认是不可以采用ftp连接的，在 /etc/vsftpd/user_list 里面，采用如下命令可以查看到内容

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的工具类

简单引入依赖

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

工具类代码

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("测试文件.txt", Files.newInputStream(Paths.get("C:/file/测试文件.txt")));try (FileOutputStream outputStream = new FileOutputStream("C:/file/测试文件2.txt")) {ftpUtil.downloadFile("测试文件.txt", outputStream);}}}