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
powershell
yum install vsftpd -y
service vsftpd start
service vsftpd status
vi /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
powershell
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
powershell
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
powershell
nl /etc/vsftpd/user_list
powershell
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
xml
<dependency>
<groupId>commons-net</groupId>
<artifactId>commons-net</artifactId>
<version>3.8.0</version>
</dependency>
工具类代码
java
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);
}
}
}