1. Add the latest commons-net package to the maven project:
<!-- ftp上传文件 -->
<dependency>
<groupId>commons-net</groupId>
<artifactId>commons-net</artifactId>
<version>3.5</version>
</dependency>2、FTPUtil.java:
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;
import java.io.*;
/**
* Created by ssl on 2017/8/7.
*/
public class FTPUtil {
/**
* 上传文件（可供Action/Controller层使用）
*
* @param hostname FTP服务器地址
* @param port FTP服务器端口号
* @param username FTP登录帐号
* @param password FTP登录密码
* @param pathname FTP服务器保存目录
* @param fileName 上传到FTP服务器后的文件名称
* @param inputStream 输入文件流
* @return
*/
public static boolean uploadFile(String hostname, int port, String username, String password, String pathname,
String fileName, InputStream inputStream) throws Exception {
boolean flag = false;
FTPClient ftpClient = new FTPClient();
ftpClient.setControlEncoding("UTF-8");
try {
//连接FTP服务器
ftpClient.connect(hostname, port);
//登录FTP服务器
ftpClient.login(username, password);
//是否成功登录FTP服务器
int replyCode = ftpClient.getReplyCode();
if (!FTPReply.isPositiveCompletion(replyCode)) {
return flag;
}
ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
ftpClient.makeDirectory(pathname);
ftpClient.changeWorkingDirectory(pathname);
ftpClient.storeFile(fileName, inputStream);
ftpClient.logout();
flag = true;
} catch (Exception e) {
throw e;
} finally {
if (null != inputStream) {
inputStream.close();
}
if (null != ftpClient) {
ftpClient.disconnect();
}
}
return flag;
}
/**
* 上传文件（可对文件进行重命名）
*
* @param hostname FTP服务器地址
* @param port FTP服务器端口号
* @param username FTP登录帐号
* @param password FTP登录密码
* @param pathname FTP服务器保存目录
* @param filename 上传到FTP服务器后的文件名称
* @param originfilename 待上传文件的名称（绝对地址）
* @return
*/
public static boolean uploadFileFromProduction(String hostname, int port, String username, String password,
String pathname, String filename, String originfilename) throws
Exception {
boolean flag = false;
InputStream inputStream = null;
try {
inputStream = new FileInputStream(new File(originfilename));
flag = uploadFile(hostname, port, username, password, pathname, filename, inputStream);
} catch (Exception e) {
throw e;
} finally {
if (null != inputStream) {
try {
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return flag;
}
/**
* 上传文件（不可以进行文件的重命名操作）
*
* @param hostname FTP服务器地址
* @param port FTP服务器端口号
* @param username FTP登录帐号
* @param password FTP登录密码
* @param pathname FTP服务器保存目录
* @param originfilename 待上传文件的名称（绝对地址）
* @return
*/
public static boolean uploadFileFromProduction(String hostname, int port, String username, String password,
String pathname, String originfilename) {
boolean flag = false;
InputStream inputStream = null;
try {
String fileName = new File(originfilename).getName();
inputStream = new FileInputStream(new File(originfilename));
flag = uploadFile(hostname, port, username, password, pathname, fileName, inputStream);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (null != inputStream) {
try {
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return flag;
}
/**
* 删除文件
*
* @param hostname FTP服务器地址
* @param port FTP服务器端口号
* @param username FTP登录帐号
* @param password FTP登录密码
* @param pathname FTP服务器保存目录
* @param filename 要删除的文件名称
* @return
*/
public static boolean deleteFile(String hostname, int port, String username, String password, String pathname,
String filename) {
boolean flag = false;
FTPClient ftpClient = new FTPClient();
try {
//连接FTP服务器
ftpClient.connect(hostname, port);
//登录FTP服务器
ftpClient.login(username, password);
//验证FTP服务器是否登录成功
int replyCode = ftpClient.getReplyCode();
if (!FTPReply.isPositiveCompletion(replyCode)) {
return flag;
}
//切换FTP目录
ftpClient.changeWorkingDirectory(pathname);
ftpClient.dele(filename);
ftpClient.logout();
flag = true;
} catch (Exception e) {
e.printStackTrace();
} finally {
if (ftpClient.isConnected()) {
try {
ftpClient.logout();
} catch (IOException e) {
}
}
}
return flag;
}
/**
* 下载文件
*
* @param hostname FTP服务器地址
* @param port FTP服务器端口号
* @param username FTP登录帐号
* @param password FTP登录密码
* @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 static boolean downloadFile(String hostname, int port, String username, String password, String pathname,
String filename, String localpath) throws Exception {
boolean success = false;
OutputStream out = null;
InputStream in = null;
FTPClient ftp = new FTPClient();//org.apache.commons.net.ftp
try {
int reply;
if (port > -1) {
ftp.connect(hostname, port);
} else {
ftp.connect(hostname);//ftp默认的端口是21
}
//很多人写的是用ftp.getReplyCode()给获取连接的返回值,但是这样会导致storeFileStream返回null
ftp.login(username, password);
ftp.enterLocalActiveMode();
ftp.setFileType(FTPClient.BINARY_FILE_TYPE);
reply = ftp.getReplyCode();
if (!FTPReply.isPositiveCompletion(reply)) {
ftp.disconnect();
return success;
}
//切换目录 此处可以判断,切换失败就说明ftp上面没有这个路径(对路径名进行转码，解决中文乱码问题)
boolean flag = ftp.changeWorkingDirectory(new String(pathname.getBytes(), FTP.DEFAULT_CONTROL_ENCODING));
if (!flag) {
throw new Exception("目录[" + pathname + "]不存在");
}
FTPFile[] fs = ftp.listFiles();
for (int i = 0; i < fs.length; i++) {
FTPFile ff = fs[i];
if (!ff.getName().equals(new String(filename.getBytes(), FTP.DEFAULT_CONTROL_ENCODING))) {
continue;
}
String outFileName = ff.getName();
//创建本地的文件时候要把编码格式转回来
//String localFileName = new String(ff.getName().getBytes("ISO-8859-1"), "UTF-8");
File localFile = new File(localpath.concat(File.separator).concat(filename));
out = new FileOutputStream(localFile);
in = ftp.retrieveFileStream(outFileName);
byte[] byteArray = new byte[4096];
int read = 0;
while ((read = in.read(byteArray)) != -1) {
out.write(byteArray, 0, read);
}
//这句很重要 要多次操作这个ftp的流的通道,要等他的每次命令完成
ftp.completePendingCommand();
out.flush();
ftp.logout();
success = true;
}
} catch (Exception e) {
throw e;
} finally {
if (null != out)
out.close();
if (null != in)
in.close();
if (ftp.isConnected()) {
ftp.disconnect();
}
}
return success;
}
}