首先声明：这段代码是我在网上胡乱找的，调试后可用。
需要提前导入jar包，我导入的是：commons-net-3.0.1，在网上可以下载到。以下为源码，其中文件夹的下载存在问题：FTPFile[] allFile = this.ftpClient.listFiles("/uploadimagefiles"); listFiles()方法总是返回为空，问题仍未解决，如有大神，还请指点。
package Ftp;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.TimeZone;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPClientConfig;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;
import org.apache.log4j.Logger;
public class Ftp {
private FTPClient ftpClient;
private String strIp;
private int intPort;
private String user;
private String password;
//Ftp构造函数
public Ftp(String strIp, int intPort, String user, String password) {
this.strIp = strIp;
this.intPort = intPort;
this.user = user;
this.password = password;
this.ftpClient = new FTPClient();
}
//登录到FTP服务器，判断是否登入成功，成功返回true，不成功返回false。
public boolean ftpLogin() {
boolean isLogin = false;
FTPClientConfig ftpClientConfig = new FTPClientConfig();
ftpClientConfig.setServerTimeZoneId(TimeZone.getDefault().getID());
this.ftpClient.setControlEncoding("GBK");
this.ftpClient.configure(ftpClientConfig);
try {
if (this.intPort > 0) {
this.ftpClient.connect(this.strIp, this.intPort);
} else {
this.ftpClient.connect(this.strIp);
}
// FTP服务器连接回答
int reply = this.ftpClient.getReplyCode();
if (!FTPReply.isPositiveCompletion(reply)) {
this.ftpClient.disconnect();
System.out.println("登录FTP服务失败！");
return isLogin;
}
this.ftpClient.login(this.user, this.password);
// 设置传输协议
this.ftpClient.enterLocalPassiveMode();
this.ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
System.out.println("用户 " + this.user + " 成功登陆FTP服务器");
isLogin = true;
} catch (Exception e) {
e.printStackTrace();
System.out.println(this.user + "登录FTP服务失败！" + e.getMessage());
}
this.ftpClient.setBufferSize(1024 * 2);
this.ftpClient.setDataTimeout(30 * 1000);
return isLogin;
}
//退出关闭服务器链接
public void ftpLogOut() {
if (null != this.ftpClient && this.ftpClient.isConnected()) {
try {
boolean reuslt = this.ftpClient.logout();// 退出FTP服务器
if (reuslt) {
System.out.println("成功退出服务器");
}
} catch (IOException e) {
e.printStackTrace();
System.out.println("退出FTP服务器异常！" + e.getMessage());
} finally {
try {
this.ftpClient.disconnect();// 关闭FTP服务器的连接
} catch (IOException e) {
e.printStackTrace();
System.out.println("关闭FTP服务器的连接异常！");
}
}
}
}
// 上传Ftp文件 @param localFile 本地文件 @param romotUpLoadePath 远程服务器路径 - 应该以/结束
public boolean uploadFile(File localFile, String romoteUpLoadePath) {
BufferedInputStream inStream = null;
boolean success = false;
try {
this.ftpClient.changeWorkingDirectory(romoteUpLoadePath);// 改变工作路径
inStream = new BufferedInputStream(new FileInputStream(localFile));
System.out.println(localFile.getName() + "开始上传.....");
long beforeTime=System.currentTimeMillis();
success = this.ftpClient.storeFile(localFile.getName(), inStream);
long afterTime=System.currentTimeMillis();
if (success == true) {
double time=(afterTime-beforeTime)/1000.0;
double uploadSpeed=(localFile.length()/(time*1024));
uploadSpeed = (double)Math.round(uploadSpeed*100)/100;
System.out.println(localFile.getName() + "上传成功,用时："+time+"秒."+"平均上传速度："+uploadSpeed+"KB/秒");
return success;
}
} catch (FileNotFoundException e) {
e.printStackTrace();
System.out.println(localFile + "未找到");
} catch (IOException e) {
e.printStackTrace();
} finally {
if (inStream != null) {
try {
inStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return success;
}
/***
* 下载文件
* @param remoteFileName 待下载文件名称
* @param localDires 下载到当地那个路径下
* @param remoteDownLoadPath remoteFileName所在的路径
* */
public boolean downloadFile(String remoteFileName, String localDires,
String remoteDownLoadPath) {
String strFilePath = localDires + "/" + remoteFileName;
BufferedOutputStream outStream = null;
boolean success = false;
try {
this.ftpClient.changeWorkingDirectory(remoteDownLoadPath);
outStream = new BufferedOutputStream(new FileOutputStream(strFilePath));
System.out.println(remoteFileName + "开始下载....");
long beforeTime=System.currentTimeMillis();
success = this.ftpClient.retrieveFile(remoteFileName, outStream);
long afterTime=System.currentTimeMillis();
if (success == true) {
double time=(afterTime-beforeTime)/1000.0;
File file=new File(strFilePath);
long length=file.length();
double downloadSpeed=(length/(time*1024));
downloadSpeed = (double)Math.round(downloadSpeed*100)/100;
System.out.println(remoteFileName + "成功下载到" + strFilePath+"用时"+time+"秒."+"平均下载速度："+downloadSpeed+"KB/秒");
return success;
}
} catch (Exception e) {
e.printStackTrace();
System.out.println(remoteFileName + "下载失败");
} finally {
if (null != outStream) {
try {
outStream.flush();
outStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
if (success == false) {
System.out.println(remoteFileName + "下载失败!!!");
}
return success;
}
/***
* @上传文件夹
* @param localDirectory
* 当地文件夹
* @param remoteDirectoryPath
* Ftp 服务器路径 以目录"/"结束
* */
public boolean uploadDirectory(String localDirectory,
String remoteDirectoryPath) {
File src = new File(localDirectory);
try {
remoteDirectoryPath = remoteDirectoryPath + src.getName() + "/";
this.ftpClient.makeDirectory(remoteDirectoryPath);
// ftpClient.listDirectories();
} catch (IOException e) {
e.printStackTrace();
System.out.println(remoteDirectoryPath + "目录创建失败");
}
File[] allFile = src.listFiles();
for (int currentFile = 0; currentFile < allFile.length; currentFile++) {
if (!allFile[currentFile].isDirectory()) {
String srcName = allFile[currentFile].getPath().toString();
uploadFile(new File(srcName), remoteDirectoryPath);
}
}
for (int currentFile = 0; currentFile < allFile.length; currentFile++) {
if (allFile[currentFile].isDirectory()) {
// 递归
uploadDirectory(allFile[currentFile].getPath().toString(),
remoteDirectoryPath);
}
}
return true;
}
/***
* @下载文件夹
* @param localDirectoryPath本地地址
* @param remoteDirectory 远程文件夹
* */
public boolean downLoadDirectory(String localDirectoryPath,String remoteDirectory) {
try {
String fileName = new File(remoteDirectory).getName();
localDirectoryPath = localDirectoryPath + "/"+ fileName + "/";
new File(localDirectoryPath).mkdirs();
ftpClient.enterLocalPassiveMode();
FTPFile[] allFile = this.ftpClient.listFiles("/uploadimagefiles");
for (int currentFile = 0; currentFile < allFile.length; currentFile++) {
if (!allFile[currentFile].isDirectory()) {
downloadFile(allFile[currentFile].getName(),localDirectoryPath, remoteDirectory);
}
}
for (int currentFile = 0; currentFile < allFile.length; currentFile++) {
if (allFile[currentFile].isDirectory()) {
String strremoteDirectoryPath = remoteDirectory + "/"+ allFile[currentFile].getName();
downLoadDirectory(localDirectoryPath,strremoteDirectoryPath);
}
}
} catch (IOException e) {
e.printStackTrace();
System.out.println("下载文件夹失败");
return false;
}
return true;
}
// FtpClient的Set 和 Get 函数
public FTPClient getFtpClient() {
return ftpClient;
}
public void setFtpClient(FTPClient ftpClient) {
this.ftpClient = ftpClient;
}
public static void main(String[] args) throws IOException {
// Ftp ftp=new Ftp("172.19.211.0",21,"Vincent","wanghe");
// ftp.ftpLogin();
//上传文件夹
//ftp.uploadDirectory("e://a1", "/");
//下载文件夹
// ftp.downLoadDirectory("d://shixizkr", "/uploadimagefiles/");
// File file = new File("e://余罪.mp4");
//ftp.uploadFile(file, "/uploadimagefiles");
// ftp.downloadFile("余罪.mp4", "e://a1", "/uploadimagefiles");
// ftp.ftpLogOut();
}
}