学步园

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(); 
     } 
   }   
}