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详解JAVA中使用FTPClient工具类上传下载

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详解JAVA中使用FTPClient工具类上传下载 。

在Java程序中，经常需要和FTP打交道，比如向FTP服务器上传文件、下载文件。本文简单介绍如何利用jakarta commons中的FTPClient（在commons-net包中）实现上传下载文件.

1、写一个javabean文件，描述ftp上传或下载的信息 。

实例代码:

 
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public class FtpUseBean {
   private String host;
   private Integer port;
   private String userName;
   private String password;
   private String ftpSeperator;
   private String ftpPath= "" ;
   private int repeatTime = 0 ; //连接ftp服务器的次数
   
   public String getHost() {
     return host;
   }
   
   public void setHost(String host) {
     this .host = host;
   }
 
   public Integer getPort() {
     return port;
   }
   public void setPort(Integer port) {
     this .port = port;
   }
   
   
   public String getUserName() {
     return userName;
   }
   
   public void setUserName(String userName) {
     this .userName = userName;
   }
   
   public String getPassword() {
     return password;
   }
   
   public void setPassword(String password) {
     this .password = password;
   }
 
   public void setFtpSeperator(String ftpSeperator) {
     this .ftpSeperator = ftpSeperator;
   }
 
   public String getFtpSeperator() {
     return ftpSeperator;
   }
 
   public void setFtpPath(String ftpPath) {
     if (ftpPath!= null )
       this .ftpPath = ftpPath;
   }
 
   public String getFtpPath() {
     return ftpPath;
   }
 
   public void setRepeatTime( int repeatTime) {
     if (repeatTime > 0 )
       this .repeatTime = repeatTime;
   }
 
   public int getRepeatTime() {
     return repeatTime;
   }
 
   /**
    * take an example:<br>
    * ftp://userName:password@ip:port/ftpPath/
    * @return
    */
   public String getFTPURL() {
     StringBuffer buf = new StringBuffer();
     buf.append( " ftp:// " );
     buf.append(getUserName());
     buf.append( ":" );
     buf.append(getPassword());
     buf.append( "@" );
     buf.append(getHost());
     buf.append( ":" );
     buf.append(getPort());
     buf.append( "/" );
     buf.append(getFtpPath());
      
     return buf.toString();
   }
}

2、导入包commons-net-1.4.1.jar  。

 
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package com.util;
 
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.SocketException;
import java.net.URL;
import java.net.URLConnection;
 
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPClientConfig;
import org.apache.commons.net.ftp.FTPFile;
 
import com.bean.FtpUseBean;
 
public class FtpUtil extends FTPClient {
 
   private static Log log = LogFactory.getLog(FtpUtil. class );
   private FtpUseBean ftpUseBean;
   //获取目标路径下的文件属性信息，主要是获取文件的size
   private FTPFile[] files;
     
   public FtpUseBean getFtpUseBean() {
     return ftpUseBean;
   }
 
 
   public FtpUtil(){
     super ();
   }
   
   
   public void setFtpUseBean(FtpUseBean ftpUseBean) {
     this .ftpUseBean = ftpUseBean;
   }
   
   public boolean ftpLogin() {
     boolean isLogined = false ;
     try {
       log.debug( "ftp login start ..." );
       int repeatTime = ftpUseBean.getRepeatTime();
       for ( int i = 0 ; i < repeatTime; i++) {
         super .connect(ftpUseBean.getHost(), ftpUseBean.getPort());
         isLogined = super .login(ftpUseBean.getUserName(), ftpUseBean.getPassword());
         if (isLogined)
           break ;
       }
       if (isLogined)
         log.debug( "ftp login successfully ..." );
       else
         log.debug( "ftp login failed ..." );
       return isLogined;
     } catch (SocketException e) {
       log.error( "" , e);
       return false ;
     } catch (IOException e) {
       log.error( "" , e);
       return false ;
     } catch (RuntimeException e) {
       log.error( "" , e);
       return false ;
     }
   }
 
   public void setFtpToUtf8() throws IOException {
 
     FTPClientConfig conf = new FTPClientConfig();
     super .configure(conf);
     super .setFileType(FTP.IMAGE_FILE_TYPE);
     int reply = super .sendCommand( "OPTS UTF8 ON" );
     if (reply == 200 ) { // UTF8 Command
       super .setControlEncoding( "UTF-8" );
     }
 
   }
 
   public void close() {
     if ( super .isConnected()) {
       try {
         super .logout();
         super .disconnect();
         log.debug( "ftp logout ...." );
       } catch (Exception e) {
         log.error(e.getMessage());
         throw new RuntimeException(e.toString());
       }
     }
   }
 
   public void uploadFileToFtpByIS(InputStream inputStream, String fileName) throws IOException {
     super .storeFile(ftpUseBean.getFtpPath()+fileName, inputStream);
   }
 
   public File downFtpFile(String fileName, String localFileName) throws IOException {
     File outfile = new File(localFileName);
     OutputStream oStream = null ;
     try {
       oStream = new FileOutputStream(outfile);
       super .retrieveFile(ftpUseBean.getFtpPath()+fileName, oStream);
       return outfile;
     } finally {
       if (oStream != null )
         oStream.close();
     }
   }
 
 
   public FTPFile[] listFtpFiles() throws IOException {
     return super .listFiles(ftpUseBean.getFtpPath());
   }
 
   public void deleteFtpFiles(FTPFile[] ftpFiles) throws IOException {
     String path = ftpUseBean.getFtpPath();
     for (FTPFile ff : ftpFiles) {
       if (ff.isFile()) {
         if (! super .deleteFile(path + ff.getName()))
           throw new RuntimeException( "delete File" + ff.getName() + " is n't seccess" );
       }
     }
   }
 
   public void deleteFtpFile(String fileName) throws IOException {
     if (! super .deleteFile(ftpUseBean.getFtpPath() +fileName))
       throw new RuntimeException( "delete File" + ftpUseBean.getFtpPath() +fileName + " is n't seccess" );
   }
 
   public InputStream downFtpFile(String fileName) throws IOException {
     return super .retrieveFileStream(ftpUseBean.getFtpPath()+fileName);
   }
 
   /**
    *
    * @return
    * @return StringBuffer
    * @description 下载ftp服务器上的文件,addr为带用户名和密码的URL
    */
   public StringBuffer downloadBufferByURL(String addr) {
     BufferedReader in = null ;
     try {
       URL url = new URL(addr);
       URLConnection conn = url.openConnection();
       in = new BufferedReader( new InputStreamReader(conn.getInputStream()));
       String line;
       StringBuffer ret = new StringBuffer();
       while ((line = in.readLine()) != null )
         ret.append(line);
       
       return ret;
     } catch (Exception e) {
       log.error(e);
       return null ;
     } finally {
       try {
         if ( null != in)
           in.close();
       } catch (IOException e) {
         e.printStackTrace();
         log.error(e);
       }
     }
   }
 
   /**
    *
    * @return
    * @return byte[]
    * @description 下载ftp服务器上的文件,addr为带用户名和密码的URL
    */
   public byte [] downloadByteByURL(String addr) {
     
     FTPClient ftp = null ;
     
     try {
       
       URL url = new URL(addr);
       
       int port = url.getPort()!=- 1 ?url.getPort(): 21 ;
       log.info( "HOST:" +url.getHost());
       log.info( "Port:" +port);
       log.info( "USERINFO:" +url.getUserInfo());
       log.info( "PATH:" +url.getPath());
       
       ftp = new FTPClient();
       
       ftp.setDataTimeout( 30000 );
       ftp.setDefaultTimeout( 30000 );
       ftp.setReaderThread( false );
       ftp.connect(url.getHost(), port);
       ftp.login(url.getUserInfo().split( ":" )[ 0 ], url.getUserInfo().split( ":" )[ 1 ]);
       FTPClientConfig conf = new FTPClientConfig( "UNIX" );  
            ftp.configure(conf); 
       log.info(ftp.getReplyString());
       
       ftp.enterLocalPassiveMode(); //ftp.enterRemotePassiveMode() 
       ftp.setFileTransferMode(FTP.STREAM_TRANSFER_MODE); 
 
       int reply = ftp.sendCommand( "OPTS UTF8 ON" ); // try to
       
       log.debug( "alter to utf-8 encoding - reply:" + reply);
       if (reply == 200 ) { // UTF8 Command
         ftp.setControlEncoding( "UTF-8" );
       }
       ftp.setFileType(FTPClient.BINARY_FILE_TYPE);
 
       log.info(ftp.getReplyString());
       
       ByteArrayOutputStream out= new ByteArrayOutputStream();
            DataOutputStream o= new DataOutputStream(out);
            String remotePath = url.getPath();
            /**
            * Fixed:if doen't remove the first "/" at the head of url,
             * the file can't be retrieved.
            */
            if (remotePath.indexOf( "/" )== 0 ) {
              remotePath = url.getPath().replaceFirst( "/" , "" );
            }
            ftp.retrieveFile(remotePath, o);      
       byte [] ret = out.toByteArray();
       o.close();
       
       String filepath = url.getPath();
       ftp.changeWorkingDirectory(filepath.substring( 0 ,filepath.lastIndexOf( "/" )));
       files = ftp.listFiles();
       
       return ret;
         } catch (Exception ex) {
       log.error( "Failed to download file from [" +addr+ "]!" +ex);
        } finally {
       try {
         if ( null !=ftp)
           ftp.disconnect();
       } catch (Exception e) {
         //
       }
     }
     return null ;
//   StringBuffer buffer = downloadBufferByURL(addr);
//   return null == buffer ? null : buffer.toString().getBytes();
   }
   
   
   
   
   public FTPFile[] getFiles() {
     return files;
   }
 
 
   public void setFiles(FTPFile[] files) {
     this .files = files;
   }
 
 
// public static void getftpfilesize(String addr){
//   
//   FTPClient ftp = null;
//   
//   try {
//     
//     URL url = new URL(addr);
//     
//     int port = url.getPort()!=-1?url.getPort():21;
//     log.info("HOST:"+url.getHost());
//     log.info("Port:"+port);
//     log.info("USERINFO:"+url.getUserInfo());
//     log.info("PATH:"+url.getPath());
//     
//     ftp = new FTPClient();
//     
//     ftp.setDataTimeout(30000);
//     ftp.setDefaultTimeout(30000);
//     ftp.setReaderThread(false);
//     ftp.connect(url.getHost(), port);
//     ftp.login(url.getUserInfo().split(":")[0], url.getUserInfo().split(":")[1]);
//     FTPClientConfig conf = new FTPClientConfig("UNIX");  
//     ftp.configure(conf); 
//     log.info(ftp.getReplyString());
//     
//     ftp.enterLocalPassiveMode(); //ftp.enterRemotePassiveMode() 
//     ftp.setFileTransferMode(FTP.STREAM_TRANSFER_MODE); 
//
//     int reply = ftp.sendCommand("OPTS UTF8 ON");// try to
//     
//     log.debug("alter to utf-8 encoding - reply:" + reply);
//     if (reply == 200) { // UTF8 Command
//       ftp.setControlEncoding("UTF-8");
//     }
//     ftp.setFileType(FTPClient.BINARY_FILE_TYPE);
//     ftp.changeWorkingDirectory(url.getPath());
//     FTPFile[] files = ftp.listFiles();
//     for (FTPFile flie : files){
//       System.out.println(new String(flie.getName().getBytes("gbk"),"ISO8859-1"));
//       System.out.println(flie.getSize());
//     }
//     
//
//   } catch (Exception ex) {
//     log.error("Failed to download file from ["+addr+"]!"+ex);
//   } finally {
//     try {<pre class="java" name="code">     if (null!=ftp)
//     ftp.disconnect();
  //     } catch (Exception e) {
}
}
}
}

以上就是JAVA FTPClient工具类的上传和下载的实例详解，如有疑问请留言或者到本站社区交流讨论，感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！ 。

原文链接：http://blog.csdn.net/jzhf2012/article/details/8455044 。

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