今天同事问我一个ftp 上传文件和下载文件功能应该怎么做，当时有点懵逼，毕竟我也是第一次，然后装了个逼，在网上找了一段代码发给同事，叫他调试一下。结果悲剧了，运行不通过。（装逼失败）
我找的文章链接：http://blog.csdn.net/yucaifu1989/article/details/51483118
为了方便大家对比，我吧文章代码偷了过来：
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自带的API对FTP的操作
* @Jdk:version 1.7
* @Title:Ftp.java
* @author: boonya
* @notice: 貌似此方法有个缺陷，不能操作大文件
*/
public class FtpJdk
{
/**
*
* 本地文件名
*/
private String localfilename;
/**
*
* 远程文件名
*/
private String remotefilename;
/**
*
* FTP客户端
*/
private FtpClient ftpClient; /**
* 服务器连接
*
* @param ip
* 服务器IP
* @param port
* 服务器端口
* @param user
* 用户名
* @param password
* 密码
* @param path
* 服务器路径
* @throws FtpProtocolException
*
*/
public void connectServer(String ip, int port, String user, String password, String path) throws FtpProtocolException
{
try
{
/* ******连接服务器的两种方法****** */
// 第一种方法
/*
* ftpClient =FtpClient.create();
* ftpClient.connect(new InetSocketAddress(ip, port));
*/
// 第二种方法
ftpClient = FtpClient.create(ip);
ftpClient.login(user, null, password);
// 设置成2进制传输
ftpClient.setBinaryType();
System.out.println("login success!"); if (path.length() != 0)
{
// 把远程系统上的目录切换到参数path所指定的目录
ftpClient.changeDirectory(path);
}
ftpClient.setBinaryType();
} catch (IOException ex)
{
ex.printStackTrace();
throw new RuntimeException(ex);
} } /**
* 关闭连接
*
*/ 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);
}
} /**
*
* 上传文件
*
* @param localFile
* 本地文件
* @param remoteFile
* 远程文件
* @throws FtpProtocolException
*/
public void upload(String localFile, String remoteFile) throws FtpProtocolException
{
this.localfilename = localFile;
this.remotefilename = remoteFile;
TelnetOutputStream os = null;
FileInputStream is = null;
try
{
// 将远程文件加入输出流中
os = (TelnetOutputStream) ftpClient.putFileStream(this.remotefilename, true); // 获取本地文件的输入流
File file_in = new File(this.localfilename);
is = new FileInputStream(file_in); // 创建一个缓冲区
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();
}
}
}
} /**
*
* 下载文件
*
* @param remoteFile
* 远程文件路径(服务器端)
* @param localFile
* 本地文件路径(客户端)
* @throws FtpProtocolException
*
*/
public void download(String remoteFile, String localFile) throws FtpProtocolException
{
TelnetInputStream is = null;
FileOutputStream os = null;
try
{ // 获取远程机器上的文件filename，借助TelnetInputStream把该文件传送到本地。
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();
}
}
}
} /**
* 函数入口
*
* @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();
/*
* 使用默认的端口号、用户名、密码以及根目录连接FTP服务器
*/
try
{
ftp.connectServer("127.0.0.1", 22, "boonya", "user@", "/temp");
} catch (FtpProtocolException e)
{
e.printStackTrace();
}
// 下载
for (int i = 0; i < filepath.length; i++)
{
try
{
ftp.download(filepath[i], localfilepath[i]);
} catch (FtpProtocolException e)
{
e.printStackTrace();
}
}
String localfile = "E:\\contact.txt";
String remotefile = "/temp/records.txt";
// 上传
try
{
ftp.upload(localfile, remotefile);
} catch (FtpProtocolException e)
{
e.printStackTrace();
}
ftp.closeConnect();
} }
文章代码
顺便把错误的log贴出来：
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
错误log
有兴趣的可以研究一下，希望找到原因的可以告诉一下博主，谢谢。
尽管博主装逼失败，但逼装了，还是要继续装下去的，于是，找到了以下的办法，博主亲测成功，不成功可以联系博主。不多说直接贴代码：
用到的jar:
commons-net-1.4.1.jar
maven下载
<dependency>
<groupId>commons-net</groupId>
<artifactId>commons-net</artifactId>
<version>1.4.1</version>
</dependency>
ftp工具类：
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 { /**
* 获取FTPClient对象
*
* @param ftpHost FTP主机服务器
* @param ftpPassword FTP 登录密码
* @param ftpUserName FTP登录用户名
* @param ftpPort FTP端口 默认为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);// 连接FTP服务器
ftpClient.login(ftpUserName, ftpPassword);// 登陆FTP服务器
if (!FTPReply.isPositiveCompletion(ftpClient.getReplyCode())) {
System.out.println("未连接到FTP，用户名或密码错误。");
ftpClient.disconnect();
} else {
System.out.println("FTP连接成功。");
}
} catch (SocketException e) {
e.printStackTrace();
System.out.println("FTP的IP地址可能错误，请正确配置。");
} catch (IOException e) {
e.printStackTrace();
System.out.println("FTP的端口错误,请正确配置。");
}
return ftpClient;
} /*
* 从FTP服务器下载文件
*
* @param ftpHost FTP IP地址
* @param ftpUserName FTP 用户名
* @param ftpPassword FTP用户名密码
* @param ftpPort FTP端口
* @param ftpPath FTP服务器中文件所在路径 格式： ftptest/aa
* @param localPath 下载到本地的位置 格式：H:/download
* @param fileName 文件名称
*/
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"); // 中文支持
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("没有找到" + ftpPath + "文件");
e.printStackTrace();
} catch (SocketException e) {
System.out.println("连接FTP失败.");
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
System.out.println("文件读取错误。");
e.printStackTrace();
} } /**
* Description: 向FTP服务器上传文件
* @param ftpHost FTP服务器hostname
* @param ftpUserName 账号
* @param ftpPassword 密码
* @param ftpPort 端口
* @param ftpPath FTP服务器中文件所在路径 格式： ftptest/aa
* @param fileName ftp文件名称
* @param input 文件流
* @return 成功返回true，否则返回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"); // 中文支持
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;
} }
测试类：
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"; //上传一个文件
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服务器上生成一个文件，并将一个字符串写入到该文件中
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();
} //下载一个文件
FtpUtil.downloadFtpFile(ftpHost, ftpUserName, ftpPassword, ftpPort, ftpPath, localPath, fileName);
}
}