FTP连接代码，可浏览FTP等

/**
 * FTP连接代码，可浏览FTP等
 * 仅适用于管理员操作，不适合普通用
 *
 * <p>Title: 冰云工作室</p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: </p>
 * @author 冰云
 * @version 1.0 August.23rd 2003
 */
public class FTPConnection {
  FtpClient client;
  private String host;
  private String username;
  private String password;
  private String path = "/";
  private int port = 21;
  private static FTPConnection instance;

  private FTPConnection() {
  }

  // 单例类的方法，获得唯一实例

  public static FTPConnection getInstance() {
    if (instance == null) {
      instance = new FTPConnection();
    }
    return instance;
  }

  // 连接FTP，并进入当前的path

  public void connect() throws IOException {
    if (client == null) {
      client = new FtpClient(host, port);
      client.login(username, password);
      client.binary();
      client.cd(path);
    }
    else {
      client.noop();
      client.cd(path);
    }
  }

  // 关闭FTP

  public void close() throws IOException {
    if (client != null) {
      client.closeServer();
    }
  }

  // 获得FTPClient类，可以直接对其操作
   
  public FtpClient getClient() throws IOException {
    if (client == null) {
      connect();
    }
    return client;
  }

  // 返回当前目录的所有文件及文件夹

  public ArrayList getFileList() throws IOException {
    BufferedReader dr = new BufferedReader(new InputStreamReader(client.list()));
    ArrayList al = new ArrayList();
    String s = "";
    while ( (s = dr.readLine()) != null) {
      al.add(s);
    }
    return al;
  }

  // 返回当前目录的文件名称

  public ArrayList getNameList() throws IOException {
    BufferedReader dr = new BufferedReader(new InputStreamReader(client.
        nameList(path)));
    ArrayList al = new ArrayList();
    String s = "";
    while ( (s = dr.readLine()) != null) {
      al.add(s);
    }
    return al;
  }

  // 判断一行文件信息是否为目录

  public boolean isDir(String line) {
    return ( (String) parseLine(line).get(0)).indexOf("d") != -1;
  }

  public boolean isFile(String line) {
    return!isDir(line);
  }

  // 处理getFileList取得的行信息

  private ArrayList parseLine(String line) {
    ArrayList s1 = new ArrayList();
    StringTokenizer st = new StringTokenizer(line, " ");
    while (st.hasMoreTokens()) {
      s1.add(st.nextToken());
    }
    return s1;
  }

  public String getFileName(String line) {
    return ( (String) parseLine(line).get(8));
  }

  public String getFileSize(String line) {
    return (String) parseLine(line).get(4);
  }

  public String getFileDate(String line) {
    ArrayList a = parseLine(line);
    return (String) a.get(5) + " " + (String) a.get(6) + " " + (String) a.get(7);