Java ftp登录，上传和下载

rka0dvk3vi

　　最近有个项目使用ftp的上传和下载的功能，从网上找了很多有关ftp的内容。我个人觉得使用appache-net比较好。应为这样可以很好的处理中文文件名，一开始我使用sun公司的jar包，但是处理中文不行。以下是ftp的登录和ftp下载代码。

package post.util;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;
public class FTPUtil {
private FTPClient client = null;
private String remoteDir = "/";
public boolean login(String host, String user, String pwd)
throws SocketException, IOException {
return login(host, user, pwd, "/");
}
/**
* 登陆
*
* @param host
* @param user
* @param pwd
* @return
* @throws IOException
* @throws SocketException
*/
public boolean login(String host, String user, String pwd, String remoteDir)
throws SocketException, IOException {
client = new FTPClient();
client.connect(host);
client.setControlEncoding("UTF-8");
int reply = client.getReplyCode();
client.setFileTransferMode(FTP.BINARY_FILE_TYPE);
client.setConnectTimeout(0);
if (!FTPReply.isPositiveCompletion(reply)) {
client.disconnect();
System.err.println("FTP server refused connection.");
}
this.remoteDir = remoteDir;
return client.login(user, pwd);
}
/***
* 得到文件名
*
* @return
*/
public List<String> getNames(boolean deep) {
List<String> names = new ArrayList<String>();
if (client != null) {
names = checkDirectory(names, client, deep);
}
return names;
}
public List<FTPFile> getFTPFiles() throws IOException {
List<FTPFile> list = new ArrayList<FTPFile>();
if (client != null) {
FTPFile[] files;
files = client.listFiles(this.remoteDir);
for (int i = 0; i < files.length; i++) {
FTPFile file = files;
String name = file.getName();
if (name.equals(".") || name.equals("..")) {
continue;
} else if (file.isFile()) {
list.add(file);
}
}
}
return list;
}
private List<String> checkDirectory(List<String> names, FTPClient client,
boolean deep) {
try {
System.out.println("---" + client.printWorkingDirectory());
FTPFile[] files = client.listFiles(client.printWorkingDirectory());
for (int i = 0; i < files.length; i++) {
FTPFile file = files;
// System.out.println(file.getTimestamp().getTime().toLocaleString());
String name = file.getName();
if (name.equals(".") || name.equals("..")) {
continue;
}
if (deep && file.isDirectory()) {
// System.out.println(client
// .printWorkingDirectory());
if (client.changeWorkingDirectory(client
.printWorkingDirectory()
+ "/" + name)) {
names = checkDirectory(names, client, deep);
}
client.changeToParentDirectory();
} else if (file.isFile()) {
String d = client.printWorkingDirectory();
d = (d.equals("/") ? "" : d);
name = d + "/" + name;
names.add(name);
}
}
} catch (IOException e) {
e.printStackTrace();
}
return names;
}
/***
* 下载数据到指定的目录中
*
* @param filename
*            ftp端文件名称
* @param local
*            客户端保存路劲
* @return
*/
public boolean download(String filename, String local) {
boolean f = false;
try {
File file = new File(local
+ (filename.startsWith("/") ? filename : "/" + filename));
File file2 = file.getParentFile();
if (!file2.exists()) {
file2.mkdirs();
}
file2 = null;
// System.out.println(file.getParent());
OutputStream out = new FileOutputStream(file);
f = client.retrieveFile(this.remoteDir + "/" + filename, out);
out.close();
// System.out.println(client.getReplyCode());
client.logout();
return true;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (client.isConnected()) {
try {
client.disconnect();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return f;
}
public static void main(String[] args) {
FTPUtil ftpUtil = new FTPUtil();
try {
boolean c = ftpUtil.login("127.0.0.1", "aata",
"123");
System.out.println(c);
} catch (SocketException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// List<String> list = ftpUtil.getNames(false);
//
// for (String string : list) {
// System.out.println(string);
// }
if (ftpUtil.download("20100714.rar", "d:/ftp")) {
System.out.println("下载成功！");
}
}
}

　　
　　
　　有时间在把上传的代码贴上。如果大家有更好的，请分享下。