Java ftp 上傳檔案和下載檔案
阿新 • • 發佈：2018-12-16
今天同事問我一個ftp 上傳檔案和下載檔案功能應該怎麼做，當時有點懵逼，畢竟我也是第一次，然後裝了個逼，在網上找了一段程式碼發給同事，叫他除錯一下。結果悲劇了，執行不通過。（裝逼失敗）
我找的文章連結：http://blog.csdn.net/yucaifu1989/article/details/51483118
為了方便大家對比，我吧文章程式碼偷了過來：
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.InetSocketAddress;
import sun.net.TelnetInputStream;
import sun.net.TelnetOutputStream;
import sun.net.ftp.FtpClient;
import sun.net.ftp.FtpProtocolException;
/**
* Java自帶的API對FTP的操作
* @Jdk:version 1.7
* @Title:Ftp.java
* @author: boonya
* @notice: 貌似此方法有個缺陷，不能操作大檔案
*/
public class FtpJdk
{
/**
*
* 本地檔名
*/
private String localfilename;
/**
*
* 遠端檔名
*/
private String remotefilename;
/**
*
* FTP客戶端
*/
private FtpClient ftpClient;
/**
* 伺服器連線
*
* @param ip
* 伺服器IP
* @param port
* 伺服器埠
* @param user
* 使用者名稱
* @param password
* 密碼
* @param path
* 伺服器路徑
* @throws FtpProtocolException
*
*/
public void connectServer(String ip, int port, String user, String password, String path) throws FtpProtocolException
{
try
{
/* ******連線伺服器的兩種方法****** */
// 第一種方法
/*
* ftpClient =FtpClient.create();
* ftpClient.connect(new InetSocketAddress(ip, port));
*/
// 第二種方法
ftpClient = FtpClient.create(ip);
ftpClient.login(user, null, password);
// 設定成2進位制傳輸
ftpClient.setBinaryType();
System.out.println("login success!");
if (path.length() != 0)
{
// 把遠端系統上的目錄切換到引數path所指定的目錄
ftpClient.changeDirectory(path);
}
ftpClient.setBinaryType();
} catch (IOException ex)
{
ex.printStackTrace();
throw new RuntimeException(ex);
}
}
/**
* 關閉連線
*
*/
public void closeConnect()
{
try
{
ftpClient.close();
System.out.println("disconnect success");
} catch (IOException ex)
{
System.out.println("not disconnect");
ex.printStackTrace();
throw new RuntimeException(ex);
}
}
/**
*
* 上傳檔案
*
* @param localFile
* 本地檔案
* @param remoteFile
* 遠端檔案
* @throws FtpProtocolException
*/
public void upload(String localFile, String remoteFile) throws FtpProtocolException
{
this.localfilename = localFile;
this.remotefilename = remoteFile;
TelnetOutputStream os = null;
FileInputStream is = null;
try
{
// 將遠端檔案加入輸出流中
os = (TelnetOutputStream) ftpClient.putFileStream(this.remotefilename, true);
// 獲取本地檔案的輸入流
File file_in = new File(this.localfilename);
is = new FileInputStream(file_in);
// 建立一個緩衝區
byte[] bytes = new byte[1024];
int c;
while ((c = is.read(bytes)) != -1)
{
os.write(bytes, 0, c);
}
System.out.println("upload success");
} catch (IOException ex)
{
System.out.println("not upload");
ex.printStackTrace();
throw new RuntimeException(ex);
} finally
{
try
{
if (is != null)
{
is.close();
}
} catch (IOException e)
{
e.printStackTrace();
} finally
{
try
{
if (os != null)
{
os.close();
}
} catch (IOException e)
{
e.printStackTrace();
}
}
}
}
/**
*
* 下載檔案
*
* @param remoteFile
* 遠端檔案路徑(伺服器端)
* @param localFile
* 本地檔案路徑(客戶端)
* @throws FtpProtocolException
*
*/
public void download(String remoteFile, String localFile) throws FtpProtocolException
{
TelnetInputStream is = null;
FileOutputStream os = null;
try
{
// 獲取遠端機器上的檔案filename，藉助TelnetInputStream把該檔案傳送到本地。
is = (TelnetInputStream) ftpClient.getFileStream(remoteFile);
File file_in = new File(localFile);
os = new FileOutputStream(file_in);
byte[] bytes = new byte[1024];
int c;
while ((c = is.read(bytes)) != -1)
{
os.write(bytes, 0, c);
}
System.out.println("download success");
} catch (IOException ex)
{
System.out.println("not download");
ex.printStackTrace();
throw new RuntimeException(ex);
} finally
{
try
{
if (is != null)
{
is.close();
}
} catch (IOException e)
{
e.printStackTrace();
} finally
{
try
{
if (os != null)
{
os.close();
}
} catch (IOException e)
{
e.printStackTrace();
}
}
}
}
/**
* 函式入口
*
* @param agrs
*/
public static void main(String agrs[])
{
String filepath[] =
{ "/temp/aa.txt", "/temp/regist.log" };
String localfilepath[] =
{ "C:\\tmp\\1.txt", "C:\\tmp\\2.log" };
FtpJdk ftp = new FtpJdk();
/*
* 使用預設的埠號、使用者名稱、密碼以及根目錄連線FTP伺服器
*/
try
{
ftp.connectServer("127.0.0.1", 22, "boonya", "
順便把錯誤的log貼出來：
sun.net.ftp.FtpProtocolException: TYPE I:530 Please login with USER and PASS.
at sun.net.ftp.impl.FtpClient.issueCommandCheck(FtpClient.java:544)
at sun.net.ftp.impl.FtpClient.setType(FtpClient.java:1668)
at sun.net.ftp.FtpClient.setBinaryType(FtpClient.java:676)
at ftp.FtpJdk.connectServer(FtpJdk.java:67)
at ftp.FtpJdk.main(FtpJdk.java:248)
not upload
Disconnected from the target VM, address: '127.0.0.1:49353', transport: 'socket'
java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
at java.net.SocketInputStream.read(SocketInputStream.java:170)
at java.net.SocketInputStream.read(SocketInputStream.java:141)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
at java.io.BufferedInputStream.read(BufferedInputStream.java:265)
at sun.net.ftp.impl.FtpClient.readServerResponse(FtpClient.java:420)
at sun.net.ftp.impl.FtpClient.readReply(FtpClient.java:497)
at sun.net.ftp.impl.FtpClient.issueCommand(FtpClient.java:532)
at sun.net.ftp.impl.FtpClient.issueCommandCheck(FtpClient.java:543)
at sun.net.ftp.impl.FtpClient.openDataConnection(FtpClient.java:757)
at sun.net.ftp.impl.FtpClient.putFileStream(FtpClient.java:1320)
at ftp.FtpJdk.upload(FtpJdk.java:122)
at ftp.FtpJdk.main(FtpJdk.java:269)
Exception in thread "main" java.lang.RuntimeException: java.net.SocketTimeoutException: Read timed out
at ftp.FtpJdk.upload(FtpJdk.java:140)
at ftp.FtpJdk.main(FtpJdk.java:269)
Caused by: java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
at java.net.SocketInputStream.read(SocketInputStream.java:170)
at java.net.SocketInputStream.read(SocketInputStream.java:141)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
at java.io.BufferedInputStream.read(BufferedInputStream.java:265)
at sun.net.ftp.impl.FtpClient.readServerResponse(FtpClient.java:420)
at sun.net.ftp.impl.FtpClient.readReply(FtpClient.java:497)
at sun.net.ftp.impl.FtpClient.issueCommand(FtpClient.java:532)
at sun.net.ftp.impl.FtpClient.issueCommandCheck(FtpClient.java:543)
at sun.net.ftp.impl.FtpClient.openDataConnection(FtpClient.java:757)
at sun.net.ftp.impl.FtpClient.putFileStream(FtpClient.java:1320)
at ftp.FtpJdk.upload(FtpJdk.java:122)
... 1 more
有興趣的可以研究一下，希望找到原因的可以告訴一下博主，謝謝。
儘管博主裝逼失敗，但逼裝了，還是要繼續裝下去的，於是，找到了以下的辦法，博主親測成功，不成功可以聯絡博主。不多說直接貼程式碼：
用到的jar:
commons-net-1.4.1.jar
maven下載
<dependency> <groupId>commons-net</groupId> <artifactId>commons-net</artifactId> <version>1.4.1</version> </dependency>
ftp工具類：
package ftp.ftp2;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPReply;
import sun.net.TelnetOutputStream;
import sun.net.ftp.FtpProtocolException;
import java.io.*;
import java.net.SocketException;
import java.util.Properties;
public class FtpUtil {
/**
* 獲取FTPClient物件
*
* @param ftpHost FTP主機伺服器
* @param ftpPassword FTP 登入密碼
* @param ftpUserName FTP登入使用者名稱
* @param ftpPort FTP埠 預設為21
* @return
*/
public static FTPClient getFTPClient(String ftpHost, String ftpUserName,
String ftpPassword, int ftpPort) {
FTPClient ftpClient = new FTPClient();
try {
ftpClient = new FTPClient();
ftpClient.connect(ftpHost, ftpPort);// 連線FTP伺服器
ftpClient.login(ftpUserName, ftpPassword);// 登陸FTP伺服器
if (!FTPReply.isPositiveCompletion(ftpClient.getReplyCode())) {
System.out.println("未連線到FTP，使用者名稱或密碼錯誤。");
ftpClient.disconnect();
} else {
System.out.println("FTP連線成功。");
}
} catch (SocketException e) {
e.printStackTrace();
System.out.println("FTP的IP地址可能錯誤，請正確配置。");
} catch (IOException e) {
e.printStackTrace();
System.out.println("FTP的埠錯誤,請正確配置。");
}
return ftpClient;
}
/*
* 從FTP伺服器下載檔案
*
* @param ftpHost FTP IP地址
* @param ftpUserName FTP 使用者名稱
* @param ftpPassword FTP使用者名稱密碼
* @param ftpPort FTP埠
* @param ftpPath FTP伺服器中檔案所在路徑 格式： ftptest/aa
* @param localPath 下載到本地的位置 格式：H:/download
* @param fileName 檔名稱
*/
public static void downloadFtpFile(String ftpHost, String ftpUserName,
String ftpPassword, int ftpPort, String ftpPath, String localPath,
String fileName) {
FTPClient ftpClient = null;
try {
ftpClient = getFTPClient(ftpHost, ftpUserName, ftpPassword, ftpPort);
ftpClient.setControlEncoding("UTF-8"); // 中文支援
ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
ftpClient.enterLocalPassiveMode();
ftpClient.changeWorkingDirectory(ftpPath);
File localFile = new File(localPath + File.separatorChar + fileName);
OutputStream os = new FileOutputStream(localFile);
ftpClient.retrieveFile(fileName, os);
os.close();
ftpClient.logout();
} catch (FileNotFoundException e) {
System.out.println("沒有找到" + ftpPath + "檔案");
e.printStackTrace();
} catch (SocketException e) {
System.out.println("連線FTP失敗.");
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
System.out.println("檔案讀取錯誤。");
e.printStackTrace();
}
}
/**
* Description: 向FTP伺服器上傳檔案
* @param ftpHost FTP伺服器hostname
* @param ftpUserName 賬號
* @param ftpPassword 密碼
* @param ftpPort 埠
* @param ftpPath FTP伺服器中檔案所在路徑 格式： ftptest/aa
* @param fileName ftp檔名稱
* @param input 檔案流
* @return 成功返回true，否則返回false
*/
public static boolean uploadFile(String ftpHost, String ftpUserName,
String ftpPassword, int ftpPort, String ftpPath,
String fileName,InputStream input) {
boolean success = false;
FTPClient ftpClient = null;
try {
int reply;
ftpClient = getFTPClient(ftpHost, ftpUserName, ftpPassword, ftpPort);
reply = ftpClient.getReplyCode();
if (!FTPReply.isPositiveCompletion(reply)) {
ftpClient.disconnect();
return success;
}
ftpClient.setControlEncoding("UTF-8"); // 中文支援
ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
ftpClient.enterLocalPassiveMode();
ftpClient.changeWorkingDirectory(ftpPath);
ftpClient.storeFile(fileName, input);
input.close();
ftpClient.logout();
success = true;
} catch (IOException e) {
e.printStackTrace();
} finally {
if (ftpClient.isConnected()) {
try {
ftpClient.disconnect();
} catch (IOException ioe) {
}
}
}
return success;
}
}
測試類：
package ftp.ftp2;
import java.io.*;
/**
* Created by jyf on 2017/6/2.
*/
public class test {
public static void main(String[] args) {
String ftpHost = "172.16.114.10";
String ftpUserName = "user";
String ftpPassword = "a";
int ftpPort = 21;
String ftpPath = "test2/";
String localPath = "F:\\11.txt";
String fileName = "11.txt";
//上傳一個檔案
try{
FileInputStream in=new FileInputStream(new File(localPath));
boolean test = FtpUtil.uploadFile(ftpHost, ftpUserName, ftpPassword, ftpPort, ftpPath, fileName,in);
System.out.println(test);
} catch (FileNotFoundException e){
e.printStackTrace();
System.out.println(e);
}
//在FTP伺服器上生成一個檔案，並將一個字串寫入到該檔案中
try {
InputStream input = new ByteArrayInputStream("test ftp jyf".getBytes("GBK"));
boolean flag = FtpUtil.uploadFile(ftpHost, ftpUserName, ftpPassword, ftpPort, ftpPath, fileName,input);;
System.out.println(flag);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
//下載一個檔案
FtpUtil.downloadFtpFile(ftpHost, ftpUserName, ftpPassword, ftpPort, ftpPath, localPath, fileName);
}
}