Java操作FTP(1)

这里记录一下java操作FTP的功能，包括上传/下载文件，文件夹，并发上传下载等，最后会分析Common-Net.jar包的内容。
先看一下常规的上传/下载文件操作的代码。

package com.lenovo.plm.dms.ftp;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.SocketException;

import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;

public class Test {

    public static void upload(String host,int port,String username,String password,String pathname,String remote,InputStream local) throws SocketException, IOException{

        FTPClient ftp = new FTPClient();
        ftp.connect(host, port);
        ftp.login(username, password);
        if(!FTPReply.isPositiveCompletion(ftp.getReplyCode())){
            ftp.disconnect();
            return;
        }
        ftp.changeWorkingDirectory(pathname);
        ftp.storeFile(remote, local);
        local.close();
        ftp.logout();
    }

    public static void download(String host,int port,String username,String password,String pathname,String fileName,String localPath) throws SocketException, IOException{

        FTPClient ftp = new FTPClient();
        ftp.connect(host, port);
        ftp.login(username, password);

        if(!FTPReply.isPositiveCompletion(ftp.getReplyCode())){
            ftp.disconnect();
            return;
        }
        ftp.changeWorkingDirectory(pathname);
        FTPFile[] fs = ftp.listFiles();
            for(FTPFile file:fs){
                if(file.getType() == 0){
                    if(file.getName().equals(fileName)){
                        File localFile = new File(localPath + "/" + file.getName());
                        OutputStream os = new FileOutputStream(localFile);
                        ftp.retrieveFile(file.getName(), os);
                        os.close();
                        return;
                    }
                }
            }

        ftp.logout();
    }

    public static void downloadDir(String host,int port,String username,String password,String pathname,String localPath) throws SocketException, IOException{

        FTPClient ftp = new FTPClient();
        ftp.connect(host, port);
        ftp.login(username, password);

        if(!FTPReply.isPositiveCompletion(ftp.getReplyCode())){
            ftp.disconnect();
            return;
        }
        ftp.changeWorkingDirectory(pathname);
        FTPFile[] fs = ftp.listFiles();
        for(FTPFile file:fs){
            if(file.getType() == 1){
                downloadDir(host,port,username,password,pathname+"/"+file.getName(),localPath);
            }else{

                File temp = new File(localPath+pathname);
                if(!temp.exists()){
                    temp.mkdirs();
                }
                File localFile = new File(localPath + pathname + "/" + file.getName());
                OutputStream os = new FileOutputStream(localFile);
                ftp.retrieveFile(file.getName(), os);
                os.close();
            }
        }
        ftp.logout();

    }

    public static void main(String[] args) throws FileNotFoundException {


        // upload file
        InputStream local = new FileInputStream(new File("D:/software/gwt-2.7.0.zip"));
        try {
            upload("10.120.24.111",21,"admin","admin","/uploaded","gwt-2.7.0.zip",local);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


        // download file.
        try {
            download("10.120.24.111",21,"admin","admin","/uploaded/","RDD.txt","d:/");
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        downloadDir("10.120.24.111",21,"admin","admin","/lenovo","d:/temp");
    }

}

单纯的上传，下载文件，下载文件夹比较简单，因此做个记录。下一次学习并发下载文件夹。