Question

怎么获取ftp的路径

Answer 1

　　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 = 0; i < files.length; i++) {
　　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();
}
}

}