首先关于配置FTP服务器
1.1、vsftpd.conf
以安装在linux下的FTP为例，首先查找到vsftpd的配置文件（默认安装的情况下配置文件位于/etc/vsftpd/vsftpd.conf），然后进行编写。具体的表格如下：
| choose_local_user=YES | choose_local_user=NO | |
|---|---|---|
| choose_list_enbale=YES | 1.所有用户都被限制在其主目录下 2.使用chroot_list_file指定的用户列表，这些用户作为“例外”，不受限制 | 1.所有用户都不被限制其主目录下 2.使用chroot_list_file指定的用户列表，这些用户作为“例外”，受到限制 |
| choose_list_enable=NO | 1、所有用户都被限制在其主目录下2.没有例外用户 | 1.所有用户都没有限制，也没有例外用户 |
package com.manage.util;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;
import java.io.*;
import static org.apache.commons.codec.binary.StringUtils.newString;
/**
* @Author: lgz
* @Date: 2020/6/8 13:40
*/
public class FTPConnectUtil {
private String FTP_ADDRESS = "192.168.174.140";
private int PORT = 21;
private String FTP_USERNAME = "admin";
private String FTP_PASSWORD = "123";
private String FTP_PATH = "/home/admin/files";
public FTPClient ftpClient = null;
/**
* 初始化ftp服务器
*/
public void initFtpClient() {
ftpClient = new FTPClient();
ftpClient.setControlEncoding("utf-8");
try {
System.out.println("connecting...ftp服务器:" + this.FTP_ADDRESS + ":" + this.PORT);
ftpClient.connect(FTP_ADDRESS, PORT); //连接ftp服务器
ftpClient.login(FTP_USERNAME, FTP_PASSWORD); //登录ftp服务器
int replyCode = ftpClient.getReplyCode(); //是否成功登录服务器
if (!FTPReply.isPositiveCompletion(replyCode)) {
System.out.println("connect failed...ftp服务器:" + this.FTP_ADDRESS + ":" + this.PORT);
}
System.out.println("connect successful");
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 上传文件
*
* @param pathname ftp服务保存地址
* @param fileName 上传到ftp的文件名
* @param originfilename 待上传文件的名称（绝对地址） *
* @return
*/
public boolean uploadFile(String pathname, String fileName, String originfilename) {
boolean flag = false;
InputStream inputStream = null;
try {
System.out.println("开始上传文件");
inputStream = new FileInputStream(new File(originfilename));
initFtpClient();
ftpClient.setFileType(ftpClient.BINARY_FILE_TYPE);
// CreateDirecroty(pathname);
// ftpClient.makeDirectory(pathname);
ftpClient.changeWorkingDirectory(pathname);
ftpClient.storeFile(fileName, inputStream);
inputStream.close();
ftpClient.logout();
flag = true;
System.out.println("上传文件成功");
} catch (Exception e) {
System.out.println("上传文件失败");
e.printStackTrace();
} finally {
if (ftpClient.isConnected()) {
try {
ftpClient.disconnect();
} catch (IOException e) {
e.printStackTrace();
}
}
if (null != inputStream) {
try {
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return true;
}
/**
* 上传文件
*
* @param pathname ftp服务保存地址
* @param fileName 上传到ftp的文件名
* @param inputStream 输入文件流
* @return
*/
public boolean uploadFile(String pathname, String fileName, InputStream inputStream) {
boolean flag = false;
try {
System.out.println("开始上传文件");
initFtpClient();
ftpClient.setFileType(ftpClient.BINARY_FILE_TYPE);
ftpClient.enterLocalPassiveMode();
CreateDirecroty(pathname);
ftpClient.makeDirectory(pathname);
ftpClient.changeWorkingDirectory(pathname);
ftpClient.storeFile( new String(fileName.getBytes("GBK"),"ISO-8859-1"), inputStream);
Thread.sleep(200);
System.out.println("正在上传图片");
inputStream.close();
ftpClient.logout();
flag = true;
System.out.println("上传文件成功");
} catch (Exception e) {
System.out.println("上传文件失败");
e.printStackTrace();
} finally {
if (ftpClient.isConnected()) {
try {
ftpClient.disconnect();
} catch (IOException e) {
e.printStackTrace();
}
}
if (null != inputStream) {
try {
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return true;
}
//改变目录路径
public boolean changeWorkingDirectory(String directory) {
boolean flag = true;
try {
flag = ftpClient.changeWorkingDirectory(directory);
if (flag) {
System.out.println("进入文件夹" + directory + " 成功！");
} else {
System.out.println("进入文件夹" + directory + " 失败！开始创建文件夹");
}
} catch (IOException ioe) {
ioe.printStackTrace();
}
return flag;
}
//创建多层目录文件，如果有ftp服务器已存在该文件，则不创建，如果无，则创建
public boolean CreateDirecroty(String remote) throws IOException {
boolean success = true;
String directory = remote + "/";
// 如果远程目录不存在，则递归创建远程服务器目录
if (!directory.equalsIgnoreCase("/") && !changeWorkingDirectory(new String(directory))) {
int start = 0;
int end = 0;
if (directory.startsWith("/")) {
start = 1;
} else {
start = 0;
}
end = directory.indexOf("/", start);
String path = "";
String paths = "";
while (true) {
String subDirectory = new String(remote.substring(start, end).getBytes("GBK"), "iso-8859-1");
path = path + "/" + subDirectory;
if (!existFile(path)) {
if (makeDirectory(subDirectory)) {
changeWorkingDirectory(subDirectory);
} else {
System.out.println("创建目录[" + subDirectory + "]失败");
changeWorkingDirectory(subDirectory);
}
} else {
changeWorkingDirectory(subDirectory);
}
paths = paths + "/" + subDirectory;
start = end + 1;
end = directory.indexOf("/", start);
// 检查所有目录是否创建完毕
if (end <= start) {
break;
}
}
}
return success;
}
//判断ftp服务器文件是否存在
public boolean existFile(String path) throws IOException {
boolean flag = false;
FTPFile[] ftpFileArr = ftpClient.listFiles(path);
if (ftpFileArr.length > 0) {
flag = true;
}
return flag;
}
//创建目录
public boolean makeDirectory(String dir) {
boolean flag = true;
try {
flag = ftpClient.makeDirectory(dir);
if (flag) {
System.out.println("创建文件夹" + dir + " 成功！");
} else {
System.out.println("创建文件夹" + dir + " 失败！");
}
} catch (Exception e) {
e.printStackTrace();
}
return flag;
}
/**
* 下载文件 *
*
* @param pathname FTP服务器文件目录 *
* @param filename 文件名称 *
* @param localpath 下载后的文件路径 *
* @return
*/
public boolean downloadFile(String pathname, String filename, String localpath) {
boolean flag = false;
OutputStream os = null;
try {
System.out.println("开始下载文件");
initFtpClient();
//切换FTP目录
ftpClient.changeWorkingDirectory(pathname);
//改为被动模式
ftpClient.enterLocalPassiveMode();
System.out.println(filename);
FTPFile[] ftpFiles = ftpClient.listFiles();
for (FTPFile file : ftpFiles) {
int type = file.getType();
if (filename.equalsIgnoreCase(file.getName())) {
System.out.println(localpath);
File localFile = new File(localpath + "/" + filename); //
os = new FileOutputStream(localFile); // os ==null
ftpClient.retrieveFile(newString(filename.getBytes("UTF-8"), "ISO-8859-1"), os);
os.close();
}
}
ftpClient.logout();
flag = true;
System.out.println("下载文件成功");
} catch (Exception e) {
System.out.println("下载文件失败");
e.printStackTrace();
} finally {
if (ftpClient.isConnected()) {
try {
ftpClient.disconnect();
} catch (IOException e) {
e.printStackTrace();
}
}
if (null != os) {
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return flag;
}
/**
* 删除文件 *
*
* @param pathname FTP服务器保存目录 *
* @param filename 要删除的文件名称 *
* @return
*/
public boolean deleteFile(String pathname, String filename) {
boolean flag = false;
try {
System.out.println("开始删除文件");
initFtpClient();
//切换FTP目录
ftpClient.changeWorkingDirectory(pathname);
ftpClient.dele(filename);
ftpClient.logout();
flag = true;
System.out.println("删除文件成功");
} catch (Exception e) {
System.out.println("删除文件失败");
e.printStackTrace();
} finally {
if (ftpClient.isConnected()) {
try {
ftpClient.disconnect();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return flag;
}
}