Apache commons-net用法的一个示例

jar:

commons-io-2.4.jar
commons-net-3.3.jar

Code：

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

import org.apache.commons.io.IOUtils;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPReply;

import entity.Config;

public class FTPUtil {
    private Config _config;

    public FTPUtil(Config config) {
        this._config = config;
    }
    
    public void download(String remoteDir, List<String> remoteFileNames, String localDir) throws IOException{        
        FTPClient ftp = new FTPClient();
        try {
            connectServer(ftp);
            configFTPClient(ftp);
            ftp.changeWorkingDirectory(remoteDir);

            for (String remote : remoteFileNames) {
                long begin=System.currentTimeMillis();
                
                OutputStream local = new FileOutputStream(new File(localDir,remote));
                ////retrieveFile的第一个参数需要是 ISO-8859-1 编码
                //new String(fileName.getBytes("GBK"),"ISO-8859-1")
                boolean result = ftp.retrieveFile(remote, local);
                
                long end=System.currentTimeMillis();
                System.out.println(remote+":"+(end-begin)+"ms");
                
                System.out.println("result:"+result);
                local.flush();
                local.close();
            }
            
        } finally {
            closeFtpClient(ftp);
        }
    }

    public void upload(String remoteDir,String localDir, List<String> localFileNames) throws IOException{
        FTPClient ftp = new FTPClient();
        try {
            connectServer(ftp);
            configFTPClient(ftp);
            ftp.changeWorkingDirectory(remoteDir);

            for (String localFileName : localFileNames) {
                long begin=System.currentTimeMillis();
                
                InputStream local=new FileInputStream(new File(localDir,localFileName));
                boolean result = ftp.storeFile(localFileName,local);
                
                long end=System.currentTimeMillis();
                System.out.println(localFileName+":"+(end-begin)+"ms");
                
                System.out.println("result:"+result);
                IOUtils.closeQuietly(local);
            }
            
        } finally {
            closeFtpClient(ftp);
        }

    }

    private void closeFtpClient(FTPClient ftp) {
        if (ftp.isConnected()) {
            try {
                ftp.logout();
                ftp.disconnect();
            } catch (IOException ioe) {
                System.out.println("Fail to close.");
            }
        }
    }

    private void configFTPClient(FTPClient ftp) throws IOException {
        final int _1MB=1024;
        ////如果缺省该句 传输txt正常 但图片和其他格式的文件传输可能会出现未知异常
        ftp.setFileType(FTP.BINARY_FILE_TYPE);
        ftp.enterLocalPassiveMode();
        System.out.println("ftp.getBufferSize():"+ftp.getBufferSize());
        ftp.setBufferSize(_1MB);
    }

    private void connectServer(FTPClient ftp) throws SocketException,
            IOException {
        int reply;
        ftp.connect(_config.getHostName(), _config.getPort());
        ftp.login(_config.getUsername(), _config.getPassword());
        // After connection attempt, you should check the reply code to verify
        // success.
        reply = ftp.getReplyCode();

        // 以2开头的返回值就会为真
        if (!FTPReply.isPositiveCompletion(reply)) {
            ftp.disconnect();
            System.err.println("FTP server refused connection.");
            throw new RuntimeException("FTP server refused connection:"
                    + ftp.getReplyString());
        }

    }

    

}

package switchplat.entity;

import java.util.List;
import java.util.Map;

public class Config {
    public String getHostName() {
        return this._hostName;
    }
    public void setHostName(String hostName) {
        this._hostName = hostName;
    }
    public int getPort() {
        return this._port;
    }
    public void setPort(int port) {
        this._port = port;
    }
    public String getUsername() {
        return this._username;
    }
    public void setUsername(String username) {
        this._username = username;
    }
    public String getPassword() {
        return this._password;
    }
    public void setPassword(String password) {
        this._password = password;
    }
    public Map<String, List<String>> getFilesToDownload() {
        return this._filesToDownload;
    }
    public void setFilesToDownload(Map<String, List<String>> filesToDownload) {
        this._filesToDownload = filesToDownload;
    }
    public Map<String, List<String>> getFilesToUpload() {
        return this._filesToUpload;
    }
    public void setFilesToUpload(Map<String, List<String>> filesToUpload) {
        this._filesToUpload = filesToUpload;
    }
    
    
    private String _hostName;
    private int _port=21;
    private String _username;
    private String _password;
    private Map<String,List<String>> _filesToDownload;
    private Map<String,List<String>> _filesToUpload;
    
}

Extension Part:

private String userName = "anonymous";//匿名登录，空字符串不行
private String password = "";//随便一个地址，我胡乱写一个也可以运行的
默认情况下，FtpClient使用的是UTF_8字符集作为服务器通讯的编码集。而FTP服务器SERV-U在windowsXP上，使用GBK字符集作为服务器通讯。

// 下面三行代码必须要，而且不能改变编码格式，否则不能正确下载中文文件
ftp.setControlEncoding("GBK");
FTPClientConfig conf = new FTPClientConfig(FTPClientConfig.SYST_NT);
conf.setServerLanguageCode("zh");


http://yijingjia.blog.sohu.com/170731845.html

http://www.open-open.com/lib/view/open1329922375281.html

         /** 
         * 重命名文件 
         * 
         * @param oldFileName --原文件名 
         * @param newFileName --新文件名 
         */ 
         public static void renameFile(String oldFileName, String newFileName) { 
                 try { 
                        connectServer(); 
                        ftpClient.rename(oldFileName, newFileName); 
                } catch (IOException ioe) { 
                        ioe.printStackTrace(); 
                } 
        } 

         /** 
         * 设置FTP客服端的配置--一般可以不设置 
         * 
         * @return ftpConfig 
         */ 
         private static FTPClientConfig getFtpConfig() { 
                FTPClientConfig ftpConfig = new FTPClientConfig(FTPClientConfig.SYST_UNIX); 
                ftpConfig.setServerLanguageCode(FTP.DEFAULT_CONTROL_ENCODING); 
                 return ftpConfig; 
        } 

         /** 
         * 在服务器上创建一个文件夹 
         * 
         * @param dir 文件夹名称，不能含有特殊字符，如  、/ 、: 、* 、?、 "、 <、>... 
         */ 
         public static boolean makeDirectory(String dir) { 
                connectServer(); 
                 boolean flag = true; 
                 try { 
                         // System.out.println("dir=======" dir); 
                        flag = ftpClient.makeDirectory(dir); 
                         if (flag) { 
                                System.out.println( "make Directory " + dir + " succeed"); 

                        } else { 

                                System.out.println( "make Directory " + dir + " false"); 
                        } 
                } catch (Exception e) { 
                        e.printStackTrace(); 
                } 
                 return flag; 
        } 

         /** 
         * 连接到服务器 
         * 
         * @return true 连接服务器成功，false 连接服务器失败 
         */ 
         public static boolean connectServer() { 
                 boolean flag = true; 
                 if (ftpClient == null) { 
                         int reply; 
                         try { 
                                setArg(configFile); 
                                ftpClient = new FTPClient(); 
                                ftpClient.setControlEncoding( "GBK"); 
                                ftpClient.setDefaultPort(port); 
                                ftpClient.configure(getFtpConfig()); 
                                ftpClient.connect(ip); 
                                ftpClient.login(userName, password); 
                                ftpClient.setDefaultPort(port); 
                                 //System.out.print(ftpClient.getReplyString()); 
                                reply = ftpClient.getReplyCode(); 
                                ftpClient.setDataTimeout(120000); 

                                 if (!FTPReply.isPositiveCompletion(reply)) { 
                                        ftpClient.disconnect(); 
                                        System.err.println( "FTP server refused connection."); 
                                         // logger.debug("FTP 服务拒绝连接！"); 
                                        flag = false; 
                                } 
//                                System.out.println(i); 
                                i++; 
                        } catch (SocketException e) { 
                                flag = false; 
                                e.printStackTrace(); 
                                System.err.println( "登录ftp服务器 " + ip + " 失败,连接超时！"); 
                        } catch (IOException e) { 
                                flag = false; 
                                e.printStackTrace(); 
                                System.err.println( "登录ftp服务器 " + ip + " 失败，FTP服务器无法打开！"); 
                        } 
                } 
                 return flag; 
        } 

    /** 
         * 删除一个文件 
         */ 
         public static boolean deleteFile(String filename) { 
                 boolean flag = true; 
                 try { 
                        connectServer(); 
                        flag = ftpClient.deleteFile(filename); 
                         if (flag) { 
                                System.out.println( "删除文件成功！"); 
                        } else { 
                                System.out.println( "删除文件失败！"); 
                        } 
                } catch (IOException ioe) { 
                        ioe.printStackTrace(); 
                } 
                 return flag; 
        } 

         /** 
         * 删除目录 
         */ 
         public static void deleteDirectory(String pathname) { 
                 try { 
                        connectServer(); 
                        File file = new File(pathname); 
                         if (file.isDirectory()) { 
                                File file2[] = file.listFiles(); 
                        } else { 
                                deleteFile(pathname); 
                        } 
                        ftpClient.removeDirectory(pathname); 
                } catch (IOException ioe) { 
                        ioe.printStackTrace(); 
                } 
        } 

         /** 
         * 删除空目录 
         */ 
         public static void deleteEmptyDirectory(String pathname) { 
                 try { 
                        connectServer(); 
                        ftpClient.removeDirectory(pathname); 
                } catch (IOException ioe) { 
                        ioe.printStackTrace(); 
                } 
        } 

         /** 
         * 列出服务器上文件和目录 
         * 
         * @param regStr --匹配的正则表达式 
         */ 
         public static void listRemoteFiles(String regStr) { 
                connectServer(); 
                 try { 
                        String files[] = ftpClient.listNames(regStr); 
                         if (files == null || files.length == 0) 
                                System.out.println( "没有任何文件!"); 
                         else { 
                                 for ( int i = 0; i < files.length; i++) { 
                                        System.out.println(files[i]); 
                                } 
                        } 
                } catch (Exception e) { 
                        e.printStackTrace(); 
                } 
        } 

         /** 
         * 列出Ftp服务器上的所有文件和目录 
         */ 
         public static void listRemoteAllFiles() { 
                connectServer(); 
                 try { 
                        String[] names = ftpClient.listNames(); 
                         for ( int i = 0; i < names.length; i++) { 
                                System.out.println(names[i]); 
                        } 
                } catch (Exception e) { 
                        e.printStackTrace(); 
                } 
        } 

http://www.open-open.com/lib/view/open1325816800031.html

1.支持上传下载。支持断点续传
2.支持进度汇报
3.支持对于中文目录及中文文件创建的支持。

Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->import java.io.File;   
import java.io.FileOutputStream;   
import java.io.IOException;   
import java.io.InputStream;   
import java.io.OutputStream;   
import java.io.PrintWriter;   
import java.io.RandomAccessFile;   
  
import open.mis.data.DownloadStatus;   
import open.mis.data.UploadStatus;   
  
import org.apache.commons.net.PrintCommandListener;   
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;   
  
/** *//**  
 * 支持断点续传的FTP实用类  
 * @author BenZhou  http://www.bt285.cn
 * @version 0.1 实现基本断点上传下载  
 * @version 0.2 实现上传下载进度汇报  
 * @version 0.3 实现中文目录创建及中文文件创建，添加对于中文的支持  
 */  
public class ContinueFTP {   
    public FTPClient ftpClient = new FTPClient();   
       
    public ContinueFTP(){   
        //设置将过程中使用到的命令输出到控制台   
        this.ftpClient.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out)));   
    }   
       
    /** *//**  
     * 连接到FTP服务器  
     * @param hostname 主机名  
     * @param port 端口  
     * @param username 用户名  
     * @param password 密码  
     * @return 是否连接成功  
     * @throws IOException  
     */  
    public boolean connect(String hostname,int port,String username,String password) throws IOException{   
        ftpClient.connect(hostname, port);   
        ftpClient.setControlEncoding("GBK");   
        if(FTPReply.isPositiveCompletion(ftpClient.getReplyCode())){   
            if(ftpClient.login(username, password)){   
                return true;   
            }   
        }   
        disconnect();   
        return false;   
    }   
       
    /** *//**  
     * 从FTP服务器上下载文件,支持断点续传，上传百分比汇报  
     * @param remote 远程文件路径  
     * @param local 本地文件路径  
     * @return 上传的状态  
     * @throws IOException  
     */  
    public DownloadStatus download(String remote,String local) throws IOException{   
        //设置被动模式   
        ftpClient.enterLocalPassiveMode();   
        //设置以二进制方式传输   
        ftpClient.setFileType(FTP.BINARY_FILE_TYPE);   
        DownloadStatus result;   
           
        //检查远程文件是否存在   
        FTPFile[] files = ftpClient.listFiles(new String(remote.getBytes("GBK"),"iso-8859-1"));   
        if(files.length != 1){   
            System.out.println("远程文件不存在");   
            return DownloadStatus.Remote_File_Noexist;   
        }   
           
        long lRemoteSize = files[0].getSize();   
        File f = new File(local);   
        //本地存在文件，进行断点下载   
        if(f.exists()){   
            long localSize = f.length();   
            //判断本地文件大小是否大于远程文件大小   
            if(localSize >= lRemoteSize){   
                System.out.println("本地文件大于远程文件，下载中止");   
                return DownloadStatus.Local_Bigger_Remote;   
            }   
               
            //进行断点续传，并记录状态   
            FileOutputStream out = new FileOutputStream(f,true);   
            ftpClient.setRestartOffset(localSize);   
            InputStream in = ftpClient.retrieveFileStream(new String(remote.getBytes("GBK"),"iso-8859-1"));   
            byte[] bytes = new byte[1024];   
            long step = lRemoteSize /100;   
            long process=localSize /step;   
            int c;   
            while((c = in.read(bytes))!= -1){   
                out.write(bytes,0,c);   
                localSize+=c;   
                long nowProcess = localSize /step;   
                if(nowProcess > process){   
                    process = nowProcess;   
                    if(process % 10 == 0)   
                        System.out.println("下载进度："+process);   
                    //TODO 更新文件下载进度,值存放在process变量中   
                }   
            }   
            in.close();   
            out.close();   
            boolean isDo = ftpClient.completePendingCommand();   
            if(isDo){   
                result = DownloadStatus.Download_From_Break_Success;   
            }else {   
                result = DownloadStatus.Download_From_Break_Failed;   
            }   
        }else {   
            OutputStream out = new FileOutputStream(f);   
            InputStream in= ftpClient.retrieveFileStream(new String(remote.getBytes("GBK"),"iso-8859-1"));   
            byte[] bytes = new byte[1024];   
            long step = lRemoteSize /100;   
            long process=0;   
            long localSize = 0L;   
            int c;   
            while((c = in.read(bytes))!= -1){   
                out.write(bytes, 0, c);   
                localSize+=c;   
                long nowProcess = localSize /step;   
                if(nowProcess > process){   
                    process = nowProcess;   
                    if(process % 10 == 0)   
                        System.out.println("下载进度："+process);   
                    //TODO 更新文件下载进度,值存放在process变量中   
                }   
            }   
            in.close();   
            out.close();   
            boolean upNewStatus = ftpClient.completePendingCommand();   
            if(upNewStatus){   
                result = DownloadStatus.Download_New_Success;   
            }else {   
                result = DownloadStatus.Download_New_Failed;   
            }   
        }   
        return result;   
    }   
       
    /** *//**  
     * 上传文件到FTP服务器，支持断点续传  
     * @param local 本地文件名称，绝对路径  
     * @param remote 远程文件路径，使用/home/directory1/subdirectory/file.ext或是 http://www.guihua.org /subdirectory/file.ext 按照Linux上的路径指定方式，支持多级目录嵌套，支持递归创建不存在的目录结构  
     * @return 上传结果  
     * @throws IOException  
     */  
    public UploadStatus upload(String local,String remote) throws IOException{   
        //设置PassiveMode传输   
        ftpClient.enterLocalPassiveMode();   
        //设置以二进制流的方式传输   
        ftpClient.setFileType(FTP.BINARY_FILE_TYPE);   
        ftpClient.setControlEncoding("GBK");   
        UploadStatus result;   
        //对远程目录的处理   
        String remoteFileName = remote;   
        if(remote.contains("/")){   
            remoteFileName = remote.substring(remote.lastIndexOf("/")+1);   
            //创建服务器远程目录结构，创建失败直接返回   
            if(CreateDirecroty(remote, ftpClient)==UploadStatus.Create_Directory_Fail){   
                return UploadStatus.Create_Directory_Fail;   
            }   
        }   
           
        //检查远程是否存在文件   
        FTPFile[] files = ftpClient.listFiles(new String(remoteFileName.getBytes("GBK"),"iso-8859-1"));   
        if(files.length == 1){   
            long remoteSize = files[0].getSize();   
            File f = new File(local);   
            long localSize = f.length();   
            if(remoteSize==localSize){   
                return UploadStatus.File_Exits;   
            }else if(remoteSize > localSize){   
                return UploadStatus.Remote_Bigger_Local;   
            }   
               
            //尝试移动文件内读取指针,实现断点续传   
            result = uploadFile(remoteFileName, f, ftpClient, remoteSize);   
               
            //如果断点续传没有成功，则删除服务器上文件，重新上传   
            if(result == UploadStatus.Upload_From_Break_Failed){   
                if(!ftpClient.deleteFile(remoteFileName)){   
                    return UploadStatus.Delete_Remote_Faild;   
                }   
                result = uploadFile(remoteFileName, f, ftpClient, 0);   
            }   
        }else {   
            result = uploadFile(remoteFileName, new File(local), ftpClient, 0);   
        }   
        return result;   
    }   
    /** *//**  
     * 断开与远程服务器的连接  
     * @throws IOException  
     */  
    public void disconnect() throws IOException{   
        if(ftpClient.isConnected()){   
            ftpClient.disconnect();   
        }   
    }   
       
    /** *//**  
     * 递归创建远程服务器目录  
     * @param remote 远程服务器文件绝对路径  
     * @param ftpClient FTPClient对象  
     * @return 目录创建是否成功  
     * @throws IOException  
     */  
    public UploadStatus CreateDirecroty(String remote,FTPClient ftpClient) throws IOException{   
        UploadStatus status = UploadStatus.Create_Directory_Success;   
        String directory = remote.substring(0,remote.lastIndexOf("/")+1);   
        if(!directory.equalsIgnoreCase("/")&&!ftpClient.changeWorkingDirectory(new String(directory.getBytes("GBK"),"iso-8859-1"))){   
            //如果远程目录不存在，则递归创建远程服务器目录   
            int start=0;   
            int end = 0;   
            if(directory.startsWith("/")){   
                start = 1;   
            }else{   
                start = 0;   
            }   
            end = directory.indexOf("/",start);   
            while(true){   
                String subDirectory = new String(remote.substring(start,end).getBytes("GBK"),"iso-8859-1");   
                if(!ftpClient.changeWorkingDirectory(subDirectory)){   
                    if(ftpClient.makeDirectory(subDirectory)){   
                        ftpClient.changeWorkingDirectory(subDirectory);   
                    }else {   
                        System.out.println("创建目录失败");   
                        return UploadStatus.Create_Directory_Fail;   
                    }   
                }   
                   
                start = end + 1;   
                end = directory.indexOf("/",start);   
                   
                //检查所有目录是否创建完毕   
                if(end <= start){   
                    break;   
                }   
            }   
        }   
        return status;   
    }   
       
    /** *//**  
     * 上传文件到服务器,新上传和断点续传  
     * @param remoteFile 远程文件名，在上传之前已经将服务器工作目录做了改变  
     * @param localFile 本地文件File句柄，绝对路径  
     * @param processStep 需要显示的处理进度步进值  
     * @param ftpClient FTPClient引用  
     * @return  
     * @throws IOException  
     */  
    public UploadStatus uploadFile(String remoteFile,File localFile,FTPClient ftpClient,long remoteSize) throws IOException{   
        UploadStatus status;   
        //显示进度的上传   
        long step = localFile.length() / 100;   
        long process = 0;   
        long localreadbytes = 0L;   
        RandomAccessFile raf = new RandomAccessFile(localFile,"r");   
        OutputStream out = ftpClient.appendFileStream(new String(remoteFile.getBytes("GBK"),"iso-8859-1"));   
        //断点续传   
        if(remoteSize>0){   
            ftpClient.setRestartOffset(remoteSize);   
            process = remoteSize /step;   
            raf.seek(remoteSize);   
            localreadbytes = remoteSize;   
        }   
        byte[] bytes = new byte[1024];   
        int c;   
        while((c = raf.read(bytes))!= -1){   
            out.write(bytes,0,c);   
            localreadbytes+=c;   
            if(localreadbytes / step != process){   
                process = localreadbytes / step;   
                System.out.println("上传进度:" + process);   
                //TODO 汇报上传状态   
            }   
        }   
        out.flush();   
        raf.close();   
        out.close();   
        boolean result =ftpClient.completePendingCommand();   
        if(remoteSize > 0){   
            status = result?UploadStatus.Upload_From_Break_Success:UploadStatus.Upload_From_Break_Failed;   
        }else {   
            status = result?UploadStatus.Upload_New_File_Success:UploadStatus.Upload_New_File_Failed;   
        }   
        return status;   
    }   
       
    public static void main(String[] args) {   
        ContinueFTP myFtp = new ContinueFTP();   
        try {   
            myFtp.connect("192.168.21.181", 21, "nid", "123");   
//          myFtp.ftpClient.makeDirectory(new String("电视剧".getBytes("GBK"),"iso-8859-1"));   
//          myFtp.ftpClient.changeWorkingDirectory(new String("电视剧".getBytes("GBK"),"iso-8859-1"));   
//          myFtp.ftpClient.makeDirectory(new String("走西口".getBytes("GBK"),"iso-8859-1"));   
//          System.out.println(myFtp.upload("http://www.5a520.cn /yw.flv", "/yw.flv",5));   
//          System.out.println(myFtp.upload("http://www.5a520.cn /走西口24.mp4","/央视走西口/新浪网/走西口24.mp4"));   
            System.out.println(myFtp.download("/央视走西口/新浪网/走西口24.mp4", "E:\走西口242.mp4"));   
            myFtp.disconnect();   
        } catch (IOException e) {   
            System.out.println("连接FTP出错："+e.getMessage());   
        }   
    }   
}

http://www.cnblogs.com/tt_mc/archive/2010/03/22/1691708.html