android 上的ftp注意有关问题

以下代码在pc上测试通过，可是在android模拟器上就不工作，不过还可以链接到服务器但不能得到文件 纠结了半天，原来是模式的问题，具体请Google 模拟器中采用建议被动模式

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	public void doWork(){						FTPClient ftp = new FTPClient();				try {			ftp.connect(server);						System.out.println("Connected to " + server);		    System.out.print(ftp.getReplyString());		    reply = ftp.getReplyCode();		    		    if(!FTPReply.isPositiveCompletion(reply)) {		        ftp.disconnect();		        System.err.println("FTP server refused connection.");		        System.exit(1);		     }		    ftp.login(username, password);		    		    FTPFile[] files = ftp.listFiles("/");		    		    if(files!=null&&files.length>0){		    			    	for(FTPFile f:files){		    				    		System.out.println("user:>>>"+f.getUser()+" name:>>>"+f.getName()+" size:>>>"+f.getSize()+" link:>>>"+f.getLink());		    				    	}		    }		} catch (SocketException e) {						e.printStackTrace();		} catch (IOException e) {						e.printStackTrace();		}					}

?加上被动模式之后，代码如下：

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public void doWork(){						FTPClient ftp = new FTPClient();				try {			ftp.connect(server);						System.out.println("Connected to " + server);		    System.out.print(ftp.getReplyString());		    reply = ftp.getReplyCode();		    		    if(!FTPReply.isPositiveCompletion(reply)) {		        ftp.disconnect();		        System.err.println("FTP server refused connection.");		        System.exit(1);		     }		    ftp.login(username, password);		   		    //设置为被动模式		   ftp.enterLocalPassiveMode();		    		    FTPFile[] files = ftp.listFiles("/");		    		    if(files!=null&&files.length>0){		    			    	for(FTPFile f:files){		    				    		System.out.println("user:>>>"+f.getUser()+" name:>>>"+f.getName()+" size:>>>"+f.getSize()+" link:>>>"+f.getLink());		    				    	}		    }		} catch (SocketException e) {						e.printStackTrace();		} catch (IOException e) {						e.printStackTrace();		}					}

?终于工作了...