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：
|
1
|
|
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
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
|
1
|
|
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
|
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
