Java实现FTP上传下载功能

http://lavasoft.blog.51cto.com/62575/93883/

Java FTP客户端工具包很多，在此我选用的Apache的FTPClient。这个包的获取可以通过[url]http://commons.apache.org/net/[/url]来获取，我使用的是最新的commons-net-1.4.1.zip。其中包含了众多的java网络编程的工具包，官方文档列举如下：
    支持网络协议如下: 
        FTP 
        NNTP 
        SMTP 
        POP3 
        Telnet 
        TFTP 
        Finger 
        Whois 
        rexec/rcmd/rlogin 
        Time (rdate) and Daytime 
        Echo 
        Discard 
        NTP/SNTP

都很有用。在此我用到的是FTP相关的一些包。

public class FtpTest { 
    public static void main(String[] args) { 
        testUpload(); 
        testDownload(); 
    } 

    /** 
     * FTP上传单个文件测试 
     */ 
    public static void testUpload() { 
        FTPClient ftpClient = new FTPClient(); 
        FileInputStream fis = null; 

        try { 
            ftpClient.connect("192.168.14.117"); 
            ftpClient.login("admin", "123"); 

            File srcFile = new File("C:\new.gif"); 
            fis = new FileInputStream(srcFile); 
            //设置上传目录 
            ftpClient.changeWorkingDirectory("/admin/pic"); 
            ftpClient.setBufferSize(1024); 
            ftpClient.setControlEncoding("GBK"); 
            //设置文件类型（二进制） 
            ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE); 
            ftpClient.storeFile("3.gif", fis); 
        } catch (IOException e) { 
            e.printStackTrace(); 
            throw new RuntimeException("FTP客户端出错！", e); 
        } finally { 
            IOUtils.closeQuietly(fis); 
            try { 
                ftpClient.disconnect(); 
            } catch (IOException e) { 
                e.printStackTrace(); 
                throw new RuntimeException("关闭FTP连接发生异常！", e); 
            } 
        } 
    } 

    /** 
     * FTP下载单个文件测试 
     */ 
    public static void testDownload() { 
        FTPClient ftpClient = new FTPClient(); 
        FileOutputStream fos = null; 

        try { 
            ftpClient.connect("192.168.14.117"); 
            ftpClient.login("admin", "123"); 

            String remoteFileName = "/admin/pic/3.gif"; 
            fos = new FileOutputStream("c:/down.gif"); 

            ftpClient.setBufferSize(1024); 
            //设置文件类型（二进制） 
            ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE); 
            ftpClient.retrieveFile(remoteFileName, fos); 
        } catch (IOException e) { 
            e.printStackTrace(); 
            throw new RuntimeException("FTP客户端出错！", e); 
        } finally { 
            IOUtils.closeQuietly(fos); 
            try { 
                ftpClient.disconnect(); 
            } catch (IOException e) { 
                e.printStackTrace(); 
                throw new RuntimeException("关闭FTP连接发生异常！", e); 
            } 
        } 
    } 
} 

public class Ftp {
    private static final Logger logger = Logger.getLogger(FTP.class);
    /**
     * FTP客户端
     */
    private FtpClient ftpClient;

    /**
     * 服务器连接
     * 
     * @param ip
     *            服务器IP
     * @param port
     *            服务器端口
     * @param user
     *            用户名
     * @param password
     *            密码
     * @param path
     *            服务器路径
     * @throws IOException
     * 
     */
    public void connectServer(String ip, int port, String user, String password, String path) throws IOException {
        try {
            System.out.println("ftp connect...");
            ftpClient = new FtpClient(ip);
            ftpClient.login(user, password);
            // 设置成2进制传输
            ftpClient.binary();
            System.out.println("ftp login success!");
            if (path.length() != 0) {
                // 把远程系统上的目录切换到参数path所指定的目录
                try {
                    ftpClient.cd(path);
                } catch (Exception e) {
                    throw new IOException("FTP server: 550 CWD failed 远程目录未响应", e);
                }
            }
            ftpClient.binary();
        } catch (IOException e) {
            logger.error("ftp connect err!");
            logger.error(e.getMessage());
            e.printStackTrace();
            throw new IOException(e.getMessage());
        }
    }

    /**
     * 关闭连接
     * 
     * 
     */
    public void closeConnect() {
        try {
            ftpClient.closeServer();
            System.out.println("closeConnect success");
        } catch (IOException ex) {
            System.out.println("not closeConnect");
            ex.printStackTrace();
            throw new RuntimeException(ex);
        }
    }

    /**
     * 上传文件
     * 
     * @param localFile
     *            本地文件
     * @param remoteFile
     *            远程文件
     * 
     */
    public void upload(String localFile, String remoteFile) {
        TelnetOutputStream os = null;
        FileInputStream is = null;
        try {
            // 将远程文件加入输出流中
            os = ftpClient.put(remoteFile);
            // 获取本地文件的输入流
            File file_in = new File(localFile);
            is = new FileInputStream(file_in);
            // 创建一个缓冲区
            byte[] bytes = new byte[1024];
            int c;
            while ((c = is.read(bytes)) != -1) {
                os.write(bytes, 0, c);
            }
            System.out.println("upload success");
        } catch (IOException ex) {
            System.out.println("not upload");
            ex.printStackTrace();
            throw new RuntimeException(ex);
        } finally {
            try {
                if (is != null) {
                    is.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    if (os != null) {
                        os.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    /**
     * 下载文件
     * 
     * @param remoteFile
     *            远程文件路径(服务器端)
     * @param localFile
     *            本地文件路径(客户端)
     * 
     */
    public void download(String remoteFile, String localFile) {
        TelnetInputStream is = null;
        FileOutputStream os = null;
        try {

            // 获取远程机器上的文件filename，借助TelnetInputStream把该文件传送到本地。
            is = ftpClient.get(remoteFile);
            File file_in = new File(localFile);
            os = new FileOutputStream(file_in);
            byte[] bytes = new byte[1024];
            int c;
            while ((c = is.read(bytes)) != -1) {
                os.write(bytes, 0, c);
            }
            System.out.println("download success");
        } catch (IOException ex) {
            System.out.println("not download");
            ex.printStackTrace();
            throw new RuntimeException(ex);
        } finally {
            try {
                if (is != null) {
                    is.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    if (os != null) {
                        os.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    /**
     * 返回FTP目录下的文件列表
     * 
     * @param ftpDirectory
     * @return
     */
    public List<String> getFileNameList(String ftpDirectory) {
        List<String> list = new ArrayList<String>();
        BufferedReader bf = null;
        InputStreamReader isr = null;
        DataInputStream ds = null;
        try {
            ds = new DataInputStream(ftpClient.nameList(ftpDirectory));
            isr = new InputStreamReader(ds);
            bf = new BufferedReader(isr);
            String filename = "";
            while ((filename = bf.readLine()) != null) {
                list.add(filename);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                ds.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                isr.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                bf.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return list;
    }

    public static void main(String agrs[]) throws Exception {

        Ftp ftp = new Ftp();
        ftp.connectServer("192.168.1.221", 21, "admin", "123@123", "/FTP Files/temp");

        List<String> list = ftp.getFileNameList("/FTP Files/temp");
        for (String str : list) {
            try {
                Calendar cal = Calendar.getInstance();// 使用日历类
                int year = cal.get(Calendar.YEAR);// 得到年
                int month = cal.get(Calendar.MONTH) + 1;// 得到月，因为从0开始的，所以要加1
                int day = cal.get(Calendar.DAY_OF_MONTH);// 得到天
                String fileName = "WiMAX_" + year + month + day;
                System.out.println("str" + str + "---------" + "fileName:" + fileName);

                String regEx = "WiMAX_\d{8}_\d{5}_\s{5}"; // 表示a或F
                Pattern pat = Pattern.compile(regEx);
                System.out.println(pat.matcher(str).find());

                // if (str.contains(fileName)) {
                // fu.download("/FTP Files/temp/" + str, "d:/temp/" + str);
                // System.out.println("download:" + str);
                // }

            } catch (Exception e) {
                e.printStackTrace();
                logger.error(e.getMessage());
                throw e;
            }
        }


        ftp.closeConnect();
    }
}