java调用ftp服务器

import java.io.DataInputStream; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.FileInputStream; 
import java.util.ArrayList; 
import java.util.Date; 
import java.util.List; 
import sun.net.*; 

import sun.net.ftp.FtpClient;
 /** 
    * connectServer 
    * 连接ftp服务器 
    * @throws java.io.IOException 
    * @param path 文件夹，空代表根目录 
    * @param password 密码 
    * @param user   登陆用户 
    * @param server 服务器地址 
    */ 
  public void connectServer(String server, String user, String password,  String path) 
  throws IOException  
  { 
     // server：FTP服务器的IP地址；user:登录FTP服务器的用户名 
     // password：登录FTP服务器的用户名的口令；path：FTP服务器上的路径 
     ftpClient = new FtpClient(); 
     ftpClient.openServer(server); 
     ftpClient.login(user, password); 
     //path是ftp服务下主目录的子目录 
     if (path.length() != 0)  ftpClient.cd(path); 
     //用2进制上传、下载 
     ftpClient.binary();      
 } 
  
 /** 
    * upload 
    * 上传文件 
    * @throws java.lang.Exception 
    * @return -1 文件不存在 
    *          -2 文件内容为空  
    *          >0 成功上传，返回文件的大小 
    * @param newname 上传后的新文件名 
    * @param filename 上传的文件 
    */ 
 public long upload(String filename,String newname) throws Exception  
 { 
     long result = 0; 
     TelnetOutputStream os = null; 
     FileInputStream is = null; 
     try {          
         java.io.File file_in = new java.io.File(filename); 
         if (!file_in.exists()) return -1; 
         if (file_in.length()==0) return -2; 
         os = ftpClient.put(newname); 
         result = file_in.length(); 
         is = new FileInputStream(file_in); 
         byte[] bytes = new byte[1024]; 
         int c; 
         while ((c = is.read(bytes)) != -1) { 
              os.write(bytes, 0, c); 
         } 
     } finally { 
         if (is != null) { 
             is.close(); 
         } 
         if (os != null) { 
            os.close(); 
         } 
     } 
    return result; 
 } 
 /** 
    * upload 
    * @throws java.lang.Exception 
    * @return  
    * @param filename 
    */ 
 public long upload(String filename) 
 throws Exception  
 { 
    String newname = ""; 
    if (filename.indexOf("/")>-1) 
    { 
       newname = filename.substring(filename.lastIndexOf("/")+1); 
    }else 
    { 
       newname = filename; 
    } 
    return upload(filename,newname); 
 } 
  
 /** 
    *  download 
    *  从ftp下载文件到本地 
    * @throws java.lang.Exception 
    * @return  
    * @param newfilename 本地生成的文件名 
    * @param filename 服务器上的文件名 
    */ 
 public long download(String filename,String newfilename)  
 throws Exception 
 {   
    long result = 0; 
    TelnetInputStream is = null; 
    FileOutputStream os = null; 
    try  
    { 
       is = ftpClient.get(filename);        
       java.io.File outfile = new java.io.File(newfilename); 
       os = new FileOutputStream(outfile); 
       byte[] bytes = new byte[1024]; 
       int c; 
       while ((c = is.read(bytes)) != -1) { 
           os.write(bytes, 0, c); 
           result = result + c; 
       } 
    } catch (IOException e)  
    { 
       e.printStackTrace(); 
    } 
    finally { 
         if (is != null) { 
             is.close(); 
         } 
         if (os != null) { 
            os.close(); 
         } 
     } 
     return result; 
 } 
 /** 
  * 取得某个目录下的所有文件列表 
  * 
  */ 
 public List getFileList(String path) 
 { 
    List list = new ArrayList(); 
    try  
    { 
       DataInputStream dis = new  DataInputStream(ftpClient.nameList(path)); 
       String filename = ""; 
       while((filename=dis.readLine())!=null)   
       {   
         list.add(filename);         
       }   
    
    } catch (Exception e)  
    { 
       e.printStackTrace(); 
    } 
    return list; 
 } 
  
 /** 
    * closeServer 
    * 断开与ftp服务器的链接 
    * @throws java.io.IOException 
    */ 
 public void closeServer() 
 throws IOException  
 {    
   try  
   { 
      if (ftpClient != null)  
      { 
        ftpClient.closeServer();      
      } 
   } catch (IOException e) { 
      e.printStackTrace(); 
   } 
 } 
   
  public static void main(String [] args) throws Exception  
  { 
    FtpUtil ftp = new FtpUtil(); 
    try { 
         //连接ftp服务器 
         ftp.connectServer("10.163.7.15", "cxl", "1", "info2"); 
         /**  上传文件到 info2 文件夹下 */ 
         System.out.println("filesize:"+ftp.upload("f:/download/Install.exe")+"字节"); 
         /** 取得info2文件夹下的所有文件列表,并下载到 E盘下 */ 
         List list = ftp.getFileList("."); 
         for (int i=0;i<list.size();i++) 
         { 
            String filename = (String)list.get(i); 
            System.out.println(filename); 
            ftp.download(filename,"E:/"+filename); 
         } 
    } catch (Exception e) { 
       /// 
    }finally 
    { 
       ftp.closeServer(); 
    } 
  }   
}