一、上传文件
原理就不介绍了,大家直接看代码吧
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/**
* 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;
}
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1.将本地文件上传到FTP服务器上,代码如下:
@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服务器上生成一个文件,并将一个字符串写入到该文件中
@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、下载文件
从FTP服务器下载文件的代码也很简单,参考如下:
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/**
* 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>
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转载于http://www.jb51.net/article/86367.htm
