使用 Apache 提供的 commons-net-3.0.jar 可以通过 FTP 与 Server 通信。
FTPUtils 类具有连接、断开连接、上传和下载方法等核心方法。
和 FTPMain 具有上传文件的主要方法。
FTPUtils：
package com.ftpclient.test;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
public class FTPUtils {
public static void ftpConnect(FTPClient ftpclient, String host, String username, String password) throws IOException {
System.out.println("FTPUtils :: Logging in FTP..");
try{
ftpclient.connect(host);
if (!ftpclient.login(username, password)) {
throw new IOException("Supplied wrong credentials to FTP Server");
}
if (ftpclient.getReplyCode() != 0) {
System.out.println(ftpclient.getReplyString());
}
}catch(IOException ioe){
ioe.printStackTrace();
System.out.println("FTP Client is not able to Connect to host");
throw new IOException("FTP Client is not able to Connect to host");
}
System.out.println("FTPUtils :: FTP Login Successful..");
}
/**
* disconnect to FTP server
*
* @param ftpclient is Object which is having details of FTP server like IP, user name and password
* @throws IOException throws Exception
*/
public static void ftpDisConnect(FTPClient ftpclient) throws IOException {
System.out.println("FTPUtils :: FTP Logging out..");
ftpclient.logout();
ftpclient.disconnect();
System.out.println("FTPUtils :: FTP Disconnected Successfully..");
}
/**
* download's file from source path to destination path by using FTP Client.
*
* @param ftpclient is Object which is having details of FTP server like IP, user name and password
* @param sourcePath is String from where to download's file
* @param destinationPath is String to where to download's file.
* @return boolean true if download's with out any fail else false
* @throws IOException will throw any problem with file system
*/
public static boolean downloadFile(FTPClient ftpclient, String sourcePath, String destinationPath) throws IOException {
System.out.println("FTPUtils :: RemoteFile download starts ..FTP SOURCE " + sourcePath + " DESTINATION " + destinationPath);
FileOutputStream fos = null;
boolean result = false;
try{
ftpclient.setFileTransferMode(FTP.BINARY_FILE_TYPE);
ftpclient.setFileType(FTP.BINARY_FILE_TYPE);
File fDestination = new File(destinationPath);
fos = new FileOutputStream(fDestination);
result = ftpclient.retrieveFile(sourcePath, fos);
if (result) {
System.out.println("FTPUtils :: RemoteFile download Completed..FTP " + sourcePath);
}
}catch(IOException ioe){
ioe.printStackTrace();
System.out.println("FTP is not able to Download the files from host");
throw new IOException("FTP is not able to Download the files from host");
}finally{
fos.close();
}
return result;
}
/**
* @param ftpclient
* @param sourcePath
* @param destinationPath
* @throws IOException
*/
public static void uploadFile(FTPClient ftpclient, String sourcePath, String destinationPath) throws IOException {
FileInputStream fis = null;
try {
//
// Create an InputStream of the file to be uploaded
//
fis = new FileInputStream(sourcePath);
//
// Store file to server
//
ftpclient.storeFile(destinationPath, fis);
}catch(IOException ioe){
ioe.printStackTrace();
System.out.println("FTP is not able to upload the files from host");
throw new IOException("FTP is not able to upload the files from host");
}finally{
fis.close();
}
}
}
FTPMain：
import java.io.IOException;
import org.apache.commons.net.ftp.FTPClient;
public class FTPMain {
public static void main(String[] str){
FTPClient ftpclient = new FTPClient();
try {
FTPUtils.ftpConnect(ftpclient, "ipaddress", "username", "password");
FTPUtils.uploadFile(ftpclient, "sourcePath", "destinationPath");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}