Java操作FTP(1)

来源：互联网发布：算法设计与分析的认识编辑：程序博客网时间：2024/05/15 03:22

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。

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