Jakarta Commons NET（FTPClient）的简单示例

ava中使用FTP传送文件或者取得文件，可以使用Jakarta Commons NET（FTPClient）的包来实现。

具体的示例如下：（例子是从网上拷贝的）

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1. package test.ftp;    
2.     
3. import java.io.FileInputStream;    
4. import java.io.FileOutputStream;    
5. import java.io.IOException;    
6. import java.io.InputStream;    
7. import java.io.OutputStream;    
8.     
9. import org.apache.commons.net.ftp.FTP;    
10. import org.apache.commons.net.ftp.FTPClient;    
11. import org.apache.commons.net.ftp.FTPReply;    
12.     
13.     
14. public class FtpClientUtil {    
15.     private static final int FTP_PORT = 21;    
16.         
17.     public static void main(String[] args) {    
18.         try {    
19.             //读入文件    
20.             FileInputStream fis = new FileInputStream("c:\testftp.txt");    
21.             //传送文件到FTP服务器  
22.             FtpClientUtil.sendFile("localhost", FTP_PORT, "testuser", "testpassword",   "remoteFilename", fis);    
23.                 
24.             //从FTP服务器取得文件    
25.             FileOutputStream fos = new FileOutputStream("localfile");     
26.             FtpClientUtil.retrieveFile("localhost", FTP_PORT, "testuser", "testpassword",   "remoteFilename", fos);    
27.                 
28.         } catch (Exception e) {    
29.             e.printStackTrace();    
30.         }    
31.     }    
32.     
33.     //上传文件    
34.     public static void sendFile (String host,     
35.             int port,    
36.             String user,    
37.             String password,    
38.             String remoteFilename,    
39.             InputStream is    
40.             ) throws Exception {    
41.         FTPClient ftpclient = new FTPClient();    
42.             
43.         try {    
44.             //设置服务器名和端口  
45.             ftpclient.connect(host, port);    
46.             int reply = ftpclient.getReplyCode();    
47.             if (!FTPReply.isPositiveCompletion(reply)) {    
48.                 //连接错误的时候报错。   
49.                 Exception ee = new Exception("Can't Connect to :" + host);    
50.                 throw ee;    
51.             }    
52.                 
53.             //登录    
54.             if (ftpclient.login(user, password) == false) {    
55.                 // invalid user/password    
56.                 Exception ee = new Exception("Invalid user/password");    
57.                 throw ee;    
58.             }    
59.     
60.             //设置传送文件模式    
61.             ftpclient.setFileType(FTP.BINARY_FILE_TYPE);    
62.                 
63.             //传送文件    
64.             ftpclient.storeFile(remoteFilename, is);                                  
65.         } catch (IOException e) {    
66.             throw e;    
67.         } finally {    
68.             try {    
69.                 ftpclient.disconnect(); //解除连接    
70.             } catch (IOException e) {    
71.             }    
72.         }    
73.             
74.     }    
75.         
76.     //文件下载    
77.     public static void retrieveFile(String host,     
78.             int port,    
79.             String user,    
80.             String password,    
81.             String remoteFilename,    
82.             OutputStream os) throws Exception {    
83.         FTPClient ftpclient = new FTPClient();    
84.             
85.         try {    
86.             //设置服务器名和端口    
87.             ftpclient.connect(host, port);    
88.             int reply = ftpclient.getReplyCode();    
89.             if (!FTPReply.isPositiveCompletion(reply)) {    
90.                 //连接错误    
91.                 Exception ee = new Exception("Can't Connect to :" + host);    
92.                 throw ee;    
93.             }    
94.                 
95.             //登录    
96.             if (ftpclient.login(user, password) == false) {    
97.                 // invalid user/password    
98.                 Exception ee = new Exception("Invalid user/password");    
99.                 throw ee;    
100.             }    
101.     
102.             //设置传送模式   
103.             ftpclient.setFileType(FTP.BINARY_FILE_TYPE);    
104.                 
105.             // 取得文件    
106.             ftpclient.retrieveFile(remoteFilename, os);    
107.     
108.         } catch (IOException e) {    
109.             throw e;    
110.         } finally {    
111.             try {    
112.                 ftpclient.disconnect(); //解除连接   
113.             } catch (IOException e) {    
114.             }    
115.         }    
116.     }    
117. }