java FTP2

/** * */ package com.sand.utils; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; 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; import org.apache.log4j.Logger; /** * FTP客户端操作的帮助类，包括连接服务器、登录、下载等操作 * * @author Administrator * */ public class FTPHelper { // 登录信息常量 public enum ClientInfo { SERVER("172.28.250.58"), USERNAME("user"), PASSWORD("password"), BINARY_TRANSFER( "true"), REMOTE_DIR("/home/ripa/data/statement/"); private String val; ClientInfo(String val) { this.val = val; } public String val() { return val; } } /** 日志 */ private Logger log = Logger.getLogger(getClass()); /** FTP客户端对象 */ private FTPClient ftp; /** * 构造方法 */ public FTPHelper() { this.ftp = new FTPClient(); // ftp.addProtocolCommandListener(new PrintCommandListener( // new PrintWriter(System.out))); } /** * 连接FTP服务器 * * @throws IOException */ public void connect() throws IOException { int reply; try { ftp.connect(ClientInfo.SERVER.val); log.info("Connected to " + ClientInfo.SERVER.val + "."); // After connection attempt, you should check the reply code to // verify // success. reply = ftp.getReplyCode(); log.info("reply:[" + reply + "]"); if (!FTPReply.isPositiveCompletion(reply)) { ftp.disconnect(); log.error("FTP server refused connection."); } log.info("Remote system is " + ftp.getSystemName()); // 登录 login(); if (Boolean.valueOf(ClientInfo.BINARY_TRANSFER.val)) { ftp.setFileType(FTP.BINARY_FILE_TYPE); } // Use passive mode as default because most of us are // behind firewalls these days. ftp.enterLocalPassiveMode(); log.info("passive mode is " + ftp.getPassivePort()); } catch (IOException e) { if (ftp.isConnected()) { try { ftp.disconnect(); } catch (IOException f) { // do nothing } } log.error("Could not connect to server."); throw e; } } /** * 登录 * * @throws IOException */ public void login() throws IOException { if (!ftp.login(ClientInfo.USERNAME.val, ClientInfo.PASSWORD.val)) { ftp.logout(); throw new IOException("登录FTP[" + ClientInfo.SERVER.val + "]服务器失败，用户名或密码不正确。"); } log.info("login is completed."); } /** * 接收文件 * * @param remote * FTP文件的远程路径 * @return InputStream * @throws IOException */ public void retrieveFile(String remote, OutputStream os) throws IOException { try { // 连接FTP服务器 connect(); // 接收文件 // InputStream is = ftp.retrieveFileStream(remote); boolean successful = ftp.retrieveFile(remote, os); // boolean complete = ftp.completePendingCommand(); log.info("File transfer: [" + successful + "]"); // 检查命令是否完成 if (!successful) { throw new IOException("File transfer failed."); } // log.info("is: [" + is + "]"); // return null; } catch (IOException ioe) { log.error(ioe); throw ioe; } finally { ftp.logout(); disconnect(); } } /** * 返回文件流形式 * * @param remote * @return * @throws IOException */ public InputStream retrieveFileStream(String remote) throws IOException { try { // 连接FTP服务器 connect(); // 接收文件 InputStream is = ftp.retrieveFileStream(remote); boolean complete = ftp.completePendingCommand(); log.info("File transfer: [" + complete + "]"); // 检查命令是否完成 if (!complete) { throw new IOException("File transfer failed."); } // log.info("is: [" + is + "]"); return is; } catch (IOException ioe) { log.error(ioe); throw ioe; } finally { ftp.logout(); disconnect(); } } /** * 下载批量文件 * * @param remotes * @return * @throws IOException */ public InputStream[] retrieveFileStream(File[] remotes) throws IOException { InputStream[] iss = new InputStream[remotes.length]; try { // 连接FTP服务器 connect(); // 批量接收文件 for (int i = 0, n = remotes.length; i < n; i++) { String path = remotes[i].getAbsolutePath(); // 检查文件是否存在 FTPFile[] files = ftp.listFiles(path); if (files != null && files.length > 0) { iss[i] = ftp.retrieveFileStream(path); log.debug("接收远程文件[" + path + "]"); boolean complete = ftp.completePendingCommand(); log.debug("File transfer: [" + complete + "]"); // 检查命令是否完成 if (!complete) { throw new IOException("File transfer failed."); } } } // log.debug("llll"); return iss; } catch (IOException ioe) { log.error(ioe); throw ioe; } finally { ftp.logout(); disconnect(); } } /** * 断开连接 */ public void disconnect() { if (ftp.isConnected()) { try { ftp.disconnect(); log.info("disconnect is complete."); } catch (IOException f) { // do nothing } } } /** * @param args */ public static void main(String[] args) throws Exception { // TODO Auto-generated method stub File f = new File("c://ss"); System.out.println(f.getPath()); } }