/** 
* Description: 向FTP服務(wù)器上傳文件 
* @Version1.0 Jul 27, 2008 4:31:09 PM by 崔紅保（cuihongbao@d-heaven.com）創(chuàng)建 
* @param url FTP服務(wù)器hostname 
* @param port FTP服務(wù)器端口 
* @param username FTP登錄賬號(hào) 
* @param password FTP登錄密碼 
* @param path FTP服務(wù)器保存目錄 
* @param filename 上傳到FTP服務(wù)器上的文件名 
* @param input 輸入流 
* @return 成功返回true，否則返回false 
*/ 
publicstaticboolean uploadFile(String url,int port,String username, String password, String path, String filename, InputStream input) { 
boolean success = false; 
FTPClient ftp = new FTPClient(); 
try { 
int reply; 
ftp.connect(url, port);//連接FTP服務(wù)器 
//如果采用默認(rèn)端口，可以使用ftp.connect(url)的方式直接連接FTP服務(wù)器 
ftp.login(username, password);//登錄 
reply = ftp.getReplyCode(); 
if (!FTPReply.isPositiveCompletion(reply)) { 
ftp.disconnect(); 
return success; 
} 
ftp.changeWorkingDirectory(path); 
ftp.storeFile(filename, input); 

input.close(); 
ftp.logout(); 
success = true; 
} catch (IOException e) { 
e.printStackTrace(); 
} finally { 
if (ftp.isConnected()) { 
try { 
ftp.disconnect(); 
} catch (IOException ioe) { 
} 
} 
} 
return success; 
}<pre></pre> 
/**
* Description: 向FTP服務(wù)器上傳文件
* @Version1.0 Jul 27, 2008 4:31:09 PM by 崔紅保（cuihongbao@d-heaven.com）創(chuàng)建
* @param url FTP服務(wù)器hostname
* @param port FTP服務(wù)器端口
* @param username FTP登錄賬號(hào)
* @param password FTP登錄密碼
* @param path FTP服務(wù)器保存目錄
* @param filename 上傳到FTP服務(wù)器上的文件名
* @param input 輸入流
* @return 成功返回true，否則返回false
*/
public static boolean uploadFile(String url,int port,String username, String password, String path, String filename, InputStream input) {
boolean success = false;
FTPClient ftp = new FTPClient();
try {
int reply;
ftp.connect(url, port);//連接FTP服務(wù)器
//如果采用默認(rèn)端口，可以使用ftp.connect(url)的方式直接連接FTP服務(wù)器
ftp.login(username, password);//登錄
reply = ftp.getReplyCode();
if (!FTPReply.isPositiveCompletion(reply)) {
ftp.disconnect();
return success;
}
ftp.changeWorkingDirectory(path);
ftp.storeFile(filename, input); 

input.close();
ftp.logout();
success = true;
} catch (IOException e) {
e.printStackTrace();
} finally {
if (ftp.isConnected()) {
try {
ftp.disconnect();
} catch (IOException ioe) {
}
}
}
return success;
}

下面我們寫兩個(gè)小例子：

1.將本地文件上傳到FTP服務(wù)器上，代碼如下：

@Test 
publicvoid testUpLoadFromDisk(){ 
try { 
FileInputStream in=new FileInputStream(new File("D:/test.txt")); 
boolean flag = uploadFile("127.0.0.1", 21, "test", "test", "D:/ftp", "test.txt", in); 
System.out.println(flag); 
} catch (FileNotFoundException e) { 
e.printStackTrace(); 
} 
}<pre></pre> 
@Test
public void testUpLoadFromDisk(){
try {
FileInputStream in=new FileInputStream(new File("D:/test.txt"));
boolean flag = uploadFile("127.0.0.1", 21, "test", "test", "D:/ftp", "test.txt", in);
System.out.println(flag);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}

2.在FTP服務(wù)器上生成一個(gè)文件，并將一個(gè)字符串寫入到該文件中

@Test 
publicvoid testUpLoadFromString(){ 
try { 
InputStream input = new ByteArrayInputStream("test ftp".getBytes("utf-8")); 
boolean flag = uploadFile("127.0.0.1", 21, "test", "test", "D:/ftp", "test.txt", input); 
System.out.println(flag); 
} catch (UnsupportedEncodingException e) { 
e.printStackTrace(); 
} 
}<pre></pre> 
@Test
public void testUpLoadFromString(){
try {
InputStream input = new ByteArrayInputStream("test ftp".getBytes("utf-8"));
boolean flag = uploadFile("127.0.0.1", 21, "test", "test", "D:/ftp", "test.txt", input);
System.out.println(flag);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}

二、下載文件

從FTP服務(wù)器下載文件的代碼也很簡(jiǎn)單，參考如下：

/** 
* Description: 從FTP服務(wù)器下載文件 
* @Version. Jul , :: PM by 崔紅保（cuihongbao@d-heaven.com）創(chuàng)建 
* @param url FTP服務(wù)器hostname 
* @param port FTP服務(wù)器端口 
* @param username FTP登錄賬號(hào) 
* @param password FTP登錄密碼 
* @param remotePath FTP服務(wù)器上的相對(duì)路徑 
* @param fileName 要下載的文件名 
* @param localPath 下載后保存到本地的路徑 
* @return 
*/ 
publicstaticboolean downFile(String url, int port,String username, String password, String remotePath,String fileName,String localPath) { 
boolean success = false; 
FTPClient ftp = new FTPClient(); 
try { 
int reply; 
ftp.connect(url, port); 
//如果采用默認(rèn)端口，可以使用ftp.connect(url)的方式直接連接FTP服務(wù)器 
ftp.login(username, password);//登錄 
reply = ftp.getReplyCode(); 
if (!FTPReply.isPositiveCompletion(reply)) { 
ftp.disconnect(); 
return success; 
} 
ftp.changeWorkingDirectory(remotePath);//轉(zhuǎn)移到FTP服務(wù)器目錄 
FTPFile[] fs = ftp.listFiles(); 
for(FTPFile ff:fs){ 
if(ff.getName().equals(fileName)){ 
File localFile = new File(localPath+"/"+ff.getName()); 
OutputStream is = new FileOutputStream(localFile); 
ftp.retrieveFile(ff.getName(), is); 
is.close(); 
} 
} 
ftp.logout(); 
success = true; 
} catch (IOException e) { 
e.printStackTrace(); 
} finally { 
if (ftp.isConnected()) { 
try { 
ftp.disconnect(); 
} catch (IOException ioe) { 
} 
} 
} 
return success; 
}<pre></pre>

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