版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/qq_26545305/article/details/80861934
1、首先在pom文件中添加ftp相关依赖。
<!--和FTP有关-->
<dependency>
<groupId>commons-net</groupId>
<artifactId>commons-net</artifactId>
<version>3.3</version>
</dependency>2、代码库如下
package com.zero.service.impl;
import com.zero.Shift;
import com.zero.StatusCode;
import com.zero.config.FtpConfig;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;
import java.io.*;
import java.net.SocketException;
/**
* Created by shuo on 2018/5/21.
*/
@Service("ftpService")
@Slf4j
public class FtpServiceImpl {
public FTPClient ftpClient = null;
public FTPClient getFTPClient(String ftpHost, String ftpUserName,
String ftpPassword, int ftpPort) throws SocketException,IOException {
ftpClient = new FTPClient();
ftpClient.setControlEncoding("utf-8");
ftpClient.setDataTimeout(60000); //设置传输超时时间为60秒
ftpClient.setConnectTimeout(60000); //连接超时为60秒
try {
ftpClient.connect(ftpHost, ftpPort);// 连接FTP服务器
ftpClient.login(ftpUserName, ftpPassword);// 登陆FTP服务器
if (!FTPReply.isPositiveCompletion(ftpClient.getReplyCode())) {
log.error("未连接到FTP，用户名或密码错误。");
ftpClient.disconnect();
}
} catch (SocketException e) {
e.printStackTrace();
throw new SocketException("FTP的IP地址可能错误，请正确配置。");
} catch (IOException e) {
e.printStackTrace();
throw new SocketException("FTP的端口错误,请正确配置。");
}
return ftpClient;
}
/**
* 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(FTPClient ftpClient,String orgId, String pathName, String fileName,String originfilename) throws Exception {
InputStream inputStream = new FileInputStream(new File(originfilename));
return uploadFile(ftpClient,pathName,fileName,inputStream);
}
/**
* 上传文件
* @param realPathName ftp服务保存地址
* @param uuidName 上传到ftp的文件名
* @param inputStream 输入文件流
* @return
*/
public boolean uploadFile(FTPClient ftpClient,String realPathName, String uuidName,InputStream inputStream) throws Exception{
boolean flag=false;
try{
this.ftpClient=ftpClient;
ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
createDirecroty(realPathName);
ftpClient.makeDirectory(realPathName);
ftpClient.changeWorkingDirectory(realPathName);
ftpClient.storeFile(uuidName, inputStream);
inputStream.close();
ftpClient.logout();
flag=true;
}catch (Exception e) {
e.printStackTrace();
System.out.println("上传文件失败");
}finally{
if(ftpClient.isConnected()){
try{
ftpClient.disconnect();
}catch(IOException e){
e.printStackTrace();
throw new Exception("上传文件失败");
}
}
}
return flag;
}
//改变目录路径
public boolean changeWorkingDirectory(String directory) throws Exception {
boolean flag = true;
try {
//flag = getDefaultFtpClient().changeWorkingDirectory(directory);
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();
throw new Exception("改变目录路径失败");
}
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 Exception {
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;
System.out.println("***************");
System.out.println("subDirectory:"+subDirectory);
System.out.println("path:"+path);
//false表示当前文件夹下没有文件
if (!existFile(path)) {
System.out.println("path:"+path+";existFile");
if (makeDirectory(subDirectory)) {
System.out.println("path:"+path+";makeDirectory");
changeWorkingDirectory(subDirectory);
System.out.println("path:"+path+";changeWorkingDirectory");
} else {
System.out.println("创建目录[" + subDirectory + "]失败");
changeWorkingDirectory(subDirectory);
}
} else {
System.out.println("path:"+path+";changeWorkingDirectory1");
changeWorkingDirectory(subDirectory);
System.out.println("path:"+path+";changeWorkingDirectory2");
}
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);
//FTPFile[] ftpFileArr = getDefaultFtpClient().listFiles(path);
if (ftpFileArr.length > 0) {
flag = true;
}
return flag;
}
//创建目录
public boolean makeDirectory(String dir) {
boolean flag = true;
try {
// flag = getDefaultFtpClient().makeDirectory(dir);
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(FTPClient ftpClient,String pathName, String fileName, OutputStream os) throws Exception{
boolean flag;
//OutputStream os=null;
try {
System.out.println("开始下载文件");
this.ftpClient=ftpClient;
//切换FTP目录
ftpClient.changeWorkingDirectory(pathName);
FTPFile[] ftpFiles = ftpClient.listFiles();
for(FTPFile file : ftpFiles){
if(fileName.equalsIgnoreCase(file.getName())){
//File localFile = new File(localpath + "/" + file.getName());
//os = new FileOutputStream(localFile);
ftpClient.retrieveFile(file.getName(), os);
os.close();
}
}
ftpClient.logout();
flag = true;
System.out.println("下载文件成功");
} catch (Exception e) {
e.printStackTrace();
throw new Exception("下载文件失败");
} finally{
if(ftpClient.isConnected()){
try{
ftpClient.disconnect();
}catch(IOException e){
e.printStackTrace();
throw new Exception("下载文件失败");
}
}
if(null != os){
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
throw new Exception("下载文件失败");
}
}
}
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(FTPClient ftpClient,String pathName, String fileName) throws Exception{
boolean flag;
try {
System.out.println("开始删除文件");
this.ftpClient=ftpClient;
//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) {
e.printStackTrace();
throw new Exception("删除文件失败");
} finally {
if(ftpClient.isConnected()){
try{
ftpClient.disconnect();
}catch(IOException e){
e.printStackTrace();
throw new Exception("删除文件失败");
}
}
}
return flag;
}
}
3、客户端
首先先获取FTPClient对象。然后就可以进行上传、下载、删除等操作啦。需要注意的是ftpclient不支持一次创建多级目录，因此需要通过迭代来创建多级目录。创建多级目录的时候需要保证是同一个对象。