问一下，你是想做ftp上传下载么？
首先你需要安装一个ftp服务端程序，启动起来，然后下载一个ftp客户端程序，测试能不能连接，首先这一块儿需要测试通过。
代码ftp上传下载
2.1 上传代码：
import java.io.File
import java.io.FileInputStream
import org.apache.commons.net.ftp.FTPClient
import org.apache.commons.net.ftp.FTPReply
public class test {
private FTPClient ftp
/**
*
* @param path 上传到ftp服务器哪个路径下
* @param addr 地址
* @param port 端口号
* @param username 用户名
* @param password 密码
* @return
* @throws Exception
*/
private boolean connect(String path,String addr,int port,String username,String password) throws Exception {
boolean result = false
ftp = new FTPClient()
int reply
ftp.connect(addr,port)
ftp.login(username,password)
ftp.setFileType(FTPClient.BINARY_FILE_TYPE)
reply = ftp.getReplyCode()
if (!FTPReply.isPositiveCompletion(reply)) {
ftp.disconnect()
return result
}
ftp.changeWorkingDirectory(path)
result = true
return result
}
/**
*
* @param file 上传的文件或文件夹
* @throws Exception
*/
private void upload(File file) throws Exception{
if(file.isDirectory()){
ftp.makeDirectory(file.getName())
ftp.changeWorkingDirectory(file.getName())
String[] files = file.list()
for (int i = 0i <files.lengthi++) {
File file1 = new File(file.getPath()+"\\"+files[i] )
if(file1.isDirectory()){
upload(file1)
ftp.changeToParentDirectory()
}else{
File file2 = new File(file.getPath()+"\\"+files[i])
FileInputStream input = new FileInputStream(file2)
ftp.storeFile(file2.getName(), input)
input.close()
}
}
}else{
File file2 = new File(file.getPath())
FileInputStream input = new FileInputStream(file2)
ftp.storeFile(file2.getName(), input)
input.close()
}
}
public static void main(String[] args) throws Exception{
test t = new test()
t.connect("", "localhost", 21, "yhh", "yhhazr")
File file = new File("e:\\uploadify")
t.upload(file)
}
}
2.2 下载代码
这里没有用到filter，如果用filter就可以过滤想要的文件。
public class Ftp {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Ftp ftp = new Ftp()
String hostname = "www.strawberry.com"
Integer port = 21
String username = "username"
String password = "password"
String remote = "/c.txt"
String local = "/home/tin/LeonChen/FTP/"
try {
ftp.connect(hostname, port, username, password)
System.out.println("接收状态："+ftp.download(remote, local))
ftp.disconnect()
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace()
}
}
private FTPClient ftpClient = new FTPClient()
/*
* * 连接到FTP服务器
* * @param hostname 主机名
* * @param port 端口
* * @param username 用户名
* * @param password 密码
* * @return 是否连接成功
* * @throws IOException
*/
private boolean connect(String hostname, int port, String username,
String password) throws IOException {
ftpClient.connect(hostname, port)
ftpClient.setControlEncoding("UTF-8")
if (FTPReply.isPositiveCompletion(ftpClient.getReplyCode())) {
if (ftpClient.login(username, password)) {
return true
}
}
disconnect()
return false
}
/*
* 从FTP服务器上下载文件,支持断点续传，上传百分比汇报
*
* @param remote 远程文件路径
*
* @param local 本地文件路径
*
* @return 上传的状态
*
* @throws IOException
*/
public DownloadStatus download(String remote, String local)
throws IOException {
// 设置被动模式
ftpClient.enterLocalPassiveMode()
// 设置以二进制方式传输
ftpClient.setFileType(FTP.BINARY_FILE_TYPE)
DownloadStatus result
// 检查远程文件是否存在
FTPFile[] files = ftpClient.listFiles(new String(remote
.getBytes("UTF-8"), "iso-8859-1"))
if (files.length != 1) {
System.out.println("远程文件不存在")
return DownloadStatus.Remote_File_Noexist
}
long lRemoteSize = files[0].getSize()
String fildName = files[0].getName()
// 本地存在文件，进行断点下载
File f = new File(local+fildName)
if (f.exists()) {
long localSize = f.length()
if (localSize >= lRemoteSize) {
System.out.println("本地文件大于远程文件，下载中止")
return DownloadStatus.Local_Bigger_Remote
}
// 进行断点续传，并记录状态
FileOutputStream out = new FileOutputStream(f, true)
ftpClient.setRestartOffset(localSize)
InputStream in = ftpClient.retrieveFileStream(new String(remote.getBytes("UTF-8"), "iso-8859-1"))
byte[] bytes = new byte[1024]
long step = lRemoteSize / 100
long process = localSize / step
int c
while ((c = in.read(bytes)) != -1) {
out.write(bytes, 0, c)
localSize += c
long nowProcess = localSize / step
if (nowProcess >process) {
process = nowProcess
if (process % 10 == 0)
System.out.println("下载进度：" + process)
// TODO 更新文件下载进度,值存放在process变量中
}
}
in.close()
out.close()
boolean isDo = ftpClient.completePendingCommand()
if (isDo) {
result = DownloadStatus.Download_From_Break_Success
} else {
result = DownloadStatus.Download_From_Break_Failed
}
} else {
OutputStream out = new FileOutputStream(f)
InputStream in = ftpClient.retrieveFileStream(new String(remote.getBytes("UTF-8"), "iso-8859-1"))
byte[] bytes = new byte[1024]
long step = lRemoteSize / 100
long process = 0
long localSize = 0L
int c
while ((c = in.read(bytes)) != -1) {
out.write(bytes, 0, c)
localSize += c
long nowProcess = localSize / step
if (nowProcess >process) {
process = nowProcess
if (process % 10 == 0)
System.out.println("下载进度：" + process)
// TODO 更新文件下载进度,值存放在process变量中
}
}
in.close()
out.close()
boolean upNewStatus = ftpClient.completePendingCommand()
if (upNewStatus) {
result = DownloadStatus.Download_New_Success
} else {
result = DownloadStatus.Download_New_Failed
}
}
return result
}
private void disconnect() throws IOException {
if (ftpClient.isConnected()) {
ftpClient.disconnect()
}
}
}
public static void main(String[] args) {// TODO Auto-generated method stub
// 创建File对象
File file = new File("d:\\")
// 使用递归方法做
dg(file)
}
private static void dg(File fl) {
// TODO Auto-generated method stub
// 创建file数组用来存储数据
File[] filArr = fl.listFiles()
// 判断FiLe数组不能为空
if (filArr != null) {
// 使用for遍历
for (File f : filArr) {
// 如果是文件夹 就递归
if (f.isDirectory()) {
// 递归
dg(f)
} else if (f.isFile()) {
System.out.println(f.getAbsolutePath())
}
}
}
}
/*** 取得相对于当前连接目录的某个目录下所有文件列表
*
* @param path
* @return
*/
public List getFileList(String path){
List list = new ArrayList()
DataInputStream dis
try {
dis = new DataInputStream(ftpClient.nameList(this.path + path))
String filename = ""
while((filename = dis.readLine()) != null){
list.add(filename)
}
} catch (IOException e) {
e.printStackTrace()
}
return list
}
我从这里拷来的 你不清楚看看里面 http://hi.baidu.com/yuanhotel/item/000b6334894d11f42784f4da
满意就采纳 谢谢
