JAVA中使用FTPClient实现文件上传下载实例代码

/** 
* Description: 向FTP服务器上传文件 
* @Version1.0 Jul 27, 2008 4:31:09 PM by 崔红保（cuihongbao@d-heaven.com）创建 
* @param url FTP服务器hostname 
* @param port FTP服务器端口 
* @param username FTP登录账号 
* @param password FTP登录密码 
* @param path FTP服务器保存目录 
* @param filename 上传到FTP服务器上的文件名 
* @param input 输入流 
* @return 成功返回true，否则返回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);//连接FTP服务器 
//如果采用默认端口，可以使用ftp.connect(url)的方式直接连接FTP服务器 
ftp.login(username, password);//登录 
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服务器上传文件
* @Version1.0 Jul 27, 2008 4:31:09 PM by 崔红保（cuihongbao@d-heaven.com）创建
* @param url FTP服务器hostname
* @param port FTP服务器端口
* @param username FTP登录账号
* @param password FTP登录密码
* @param path FTP服务器保存目录
* @param filename 上传到FTP服务器上的文件名
* @param input 输入流
* @return 成功返回true，否则返回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);//连接FTP服务器
//如果采用默认端口，可以使用ftp.connect(url)的方式直接连接FTP服务器
ftp.login(username, password);//登录
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;
} 

@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();
}
} 

@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();
}
} 

/** 
* Description: 从FTP服务器下载文件 
* @Version. Jul , :: PM by 崔红保（cuihongbao@d-heaven.com）创建 
* @param url FTP服务器hostname 
* @param port FTP服务器端口 
* @param username FTP登录账号 
* @param password FTP登录密码 
* @param remotePath FTP服务器上的相对路径 
* @param fileName 要下载的文件名 
* @param localPath 下载后保存到本地的路径 
* @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); 
//如果采用默认端口，可以使用ftp.connect(url)的方式直接连接FTP服务器 
ftp.login(username, password);//登录 
reply = ftp.getReplyCode(); 
if (!FTPReply.isPositiveCompletion(reply)) { 
ftp.disconnect(); 
return success; 
} 
ftp.changeWorkingDirectory(remotePath);//转移到FTP服务器目录 
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>