实现ftp断点下载和上传
1、 实现类
package ftp.test.continueDown;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.RandomAccessFile;
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;
import org.apache.log4j.Logger;
/**
* 利用org.apache.commons.net.ftp包实现一个简单的ftp客户端实用类。主要实现一下功能
1.支持上传下载。支持断点续传
2.支持进度汇报
3.支持对于中文目录及中文文件创建的支持。
* 支持断点续传的FTP实用类
* @version 0.1 实现基本断点上传下载
* @version 0.2 实现上传下载进度汇报
* @version 0.3 实现中文目录创建及中文文件创建，添加对于中文的支持
* @author shang_xying
*
*/
public class ContinueFTP {
private final Logger log = Logger.getLogger(ContinueFTP.class);
private static class continueFtp{
static ContinueFTP instance = new ContinueFTP();
}
public static ContinueFTP getInstance(){
return continueFtp.instance;
}
//枚举类UploadStatus
public enum UploadStatus {
CREATE_DIRECTORY_FAIL, // 远程服务器相应目录创建失败
CREATE_DIRECTORY_SUCCESS, // 远程服务器闯将目录成功
UPLOAD_NEW_FILE_SUCCESS, // 上传新文件成功
UPLOAD_NEW_FILE_FAILED, // 上传新文件失败
FILE_EXITS, // 文件已经存在
REMOTE_BIGGER_LOCAL, // 远程文件大于本地文件
UPLOAD_FROM_BREAK_SUCCESS, // 断点续传成功
UPLOAD_FROM_BREAK_FAILED, // 断点续传失败
DELETE_REMOTE_FAILD; // 删除远程文件失败
}
//枚举类DownloadStatus
public enum DownloadStatus {
REMOTE_FILE_NOEXIST, // 远程文件不存在
LOCAL_BIGGER_REMOTE, // 本地文件大于远程文件
DOWNLOAD_FROM_BREAK_SUCCESS, // 断点下载文件成功
DOWNLOAD_FROM_BREAK_FAILED, // 断点下载文件失败
DOWNLOAD_NEW_SUCCESS, // 全新下载文件成功
DOWNLOAD_NEW_FAILED; // 全新下载文件失败
}
public FTPClient ftpClient = new FTPClient();
public ContinueFTP(){
//设置将过程中使用到的命令输出到控制台
this.ftpClient.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out)));
}
/** *//**
* 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
*/
public boolean connect(String hostname,int port,String username,String password) throws IOException{
ftpClient.connect(hostname, port);
ftpClient.setControlEncoding("GBK");
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("GBK"),"iso-8859-1")); //控制台输出乱码
FTPFile[] files = ftpClient.listFiles(new String(remote.getBytes("UTF-8"))); //remote.getBytes()控制台输出也无乱码
if(files.length != 1){
System.out.println("远程文件不存在");
return DownloadStatus.REMOTE_FILE_NOEXIST;
}
long lRemoteSize = files[0].getSize();
File f = new File(local);
//本地存在文件，进行断点下载
if(f.exists()){
long localSize = f.length();
//判断本地文件大小是否大于远程文件大小
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("GBK"),"iso-8859-1")); //控制台输出乱码
InputStream in = ftpClient.retrieveFileStream(new String(remote.getBytes("UTF-8"))); //remote.getBytes()控制台输出也无乱码
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+"%");
//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("GBK"),"iso-8859-1")); //控制台输出乱码
InputStream in= ftpClient.retrieveFileStream(new String(remote.getBytes("UTF-8"))); //remote.getBytes()控制台输出也无乱码
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+"%");
//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;
}
/** *//** 上传如果有乱码同下载设置编码格式
* 上传文件到FTP服务器，支持断点续传
* @param local 本地文件名称，绝对路径
* @param remote 远程文件路径，使用/home/directory1/subdirectory/file.ext或是 http://www.guihua.org /subdirectory/file.ext 按照Linux上的路径指定方式，支持多级目录嵌套，支持递归创建不存在的目录结构
* @return 上传结果
* @throws IOException
*/
public UploadStatus upload(String local,String remote) throws IOException{
//设置PassiveMode传输
ftpClient.enterLocalPassiveMode();
//设置以二进制流的方式传输
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
ftpClient.setControlEncoding("GBK");
UploadStatus result;
//对远程目录的处理
String remoteFileName = remote;
if(remote.contains("/")){
remoteFileName = remote.substring(remote.lastIndexOf("/")+1);
//创建服务器远程目录结构，创建失败直接返回
if(CreateDirecroty(remote, ftpClient)==UploadStatus.CREATE_DIRECTORY_FAIL){
return UploadStatus.CREATE_DIRECTORY_FAIL;
}
}
//检查远程是否存在文件
FTPFile[] files = ftpClient.listFiles(new String(remoteFileName.getBytes("GBK"),"iso-8859-1"));
if(files.length == 1){
long remoteSize = files[0].getSize();
File f = new File(local);
long localSize = f.length();
if(remoteSize==localSize){
return UploadStatus.FILE_EXITS;
}else if(remoteSize > localSize){
return UploadStatus.REMOTE_BIGGER_LOCAL;
}
//尝试移动文件内读取指针,实现断点续传
result = uploadFile(remoteFileName, f, ftpClient, remoteSize);
//如果断点续传没有成功，则删除服务器上文件，重新上传
if(result == UploadStatus.UPLOAD_FROM_BREAK_FAILED){
if(!ftpClient.deleteFile(remoteFileName)){
return UploadStatus.DELETE_REMOTE_FAILD;
}
result = uploadFile(remoteFileName, f, ftpClient, 0);
}
}else {
result = uploadFile(remoteFileName, new File(local), ftpClient, 0);
}
return result;
}
/** *//**
* 断开与远程服务器的连接
* @throws IOException
*/
public void disconnect() throws IOException{
if(ftpClient.isConnected()){
ftpClient.disconnect();
}
}
/** *//**
* 递归创建远程服务器目录
* @param remote 远程服务器文件绝对路径
* @param ftpClient FTPClient对象
* @return 目录创建是否成功
* @throws IOException
*/
public UploadStatus CreateDirecroty(String remote,FTPClient ftpClient) throws IOException{
UploadStatus status = UploadStatus.CREATE_DIRECTORY_SUCCESS;
String directory = remote.substring(0,remote.lastIndexOf("/")+1);
if(!directory.equalsIgnoreCase("/")&&!ftpClient.changeWorkingDirectory(new String(directory.getBytes("GBK"),"iso-8859-1"))){
//如果远程目录不存在，则递归创建远程服务器目录
int start=0;
int end = 0;
if(directory.startsWith("/")){
start = 1;
}else{
start = 0;
}
end = directory.indexOf("/",start);
while(true){
String subDirectory = new String(remote.substring(start,end).getBytes("GBK"),"iso-8859-1");
if(!ftpClient.changeWorkingDirectory(subDirectory)){
if(ftpClient.makeDirectory(subDirectory)){
ftpClient.changeWorkingDirectory(subDirectory);
}else {
System.out.println("创建目录失败");
return UploadStatus.CREATE_DIRECTORY_FAIL;
}
}
start = end + 1;
end = directory.indexOf("/",start);
//检查所有目录是否创建完毕
if(end <= start){
break;
}
}
}
return status;
}
/** *//**
* 上传文件到服务器,新上传和断点续传
* @param remoteFile 远程文件名，在上传之前已经将服务器工作目录做了改变
* @param localFile 本地文件File句柄，绝对路径
* @param processStep 需要显示的处理进度步进值
* @param ftpClient FTPClient引用
* @return
* @throws IOException
*/
public UploadStatus uploadFile(String remoteFile,File localFile,FTPClient ftpClient,long remoteSize) throws IOException{
UploadStatus status;
//显示进度的上传
long step = localFile.length() / 100;
long process = 0;
long localreadbytes = 0L;
RandomAccessFile raf = new RandomAccessFile(localFile,"r");
OutputStream out = ftpClient.appendFileStream(new String(remoteFile.getBytes("GBK"),"iso-8859-1"));
//断点续传
if(remoteSize>0){
ftpClient.setRestartOffset(remoteSize);
process = remoteSize /step;
raf.seek(remoteSize);
localreadbytes = remoteSize;
}
byte[] bytes = new byte[1024];
int c;
while((c = raf.read(bytes))!= -1){
out.write(bytes,0,c);
localreadbytes+=c;
if(localreadbytes / step != process){
process = localreadbytes / step;
System.out.println("上传进度:" + process);
//汇报上传状态
}
}
out.flush();
raf.close();
out.close();
boolean result =ftpClient.completePendingCommand();
if(remoteSize > 0){
status = result?UploadStatus.UPLOAD_FROM_BREAK_SUCCESS:UploadStatus.UPLOAD_FROM_BREAK_FAILED;
}else {
status = result?UploadStatus.UPLOAD_NEW_FILE_SUCCESS:UploadStatus.UPLOAD_NEW_FILE_FAILED;
}
return status;
}
public static void main(String[] args) {
ContinueFTP myFtp = new ContinueFTP();
try {
myFtp.connect("192.168.51.11", 21, "user", "123");
// myFtp.ftpClient.makeDirectory(new String("电视剧".getBytes("GBK"),"iso-8859-1"));
// myFtp.ftpClient.changeWorkingDirectory(new String("电视剧".getBytes("GBK"),"iso-8859-1"));
// myFtp.ftpClient.makeDirectory(new String("走西口".getBytes("GBK"),"iso-8859-1"));
// System.out.println(myFtp.upload("http://www.5a520.cn /yw.flv", "/yw.flv",5));
// System.out.println(myFtp.upload("http://www.5a520.cn /走西口24.mp4","/央视走西口/新浪网/走西口24.mp4"));
System.out.println(myFtp.download("/Book/IT健康/IT人健康宝典V2版.pdf", "E:\\temp\\IT人健康宝典V2版.pdf"));
myFtp.disconnect();
} catch (IOException e) {
System.out.println("连接FTP出错："+e.getMessage());
}
}
public void timerContinueFtp(){
//ContinueFTP myFtp = new ContinueFTP();
try {
connect("192.168.51.11", 21, "user", "123");
// myFtp.ftpClient.makeDirectory(new String("电视剧".getBytes("GBK"),"iso-8859-1"));
// myFtp.ftpClient.changeWorkingDirectory(new String("电视剧".getBytes("GBK"),"iso-8859-1"));
// myFtp.ftpClient.makeDirectory(new String("走西口".getBytes("GBK"),"iso-8859-1"));
// System.out.println(myFtp.upload("http://www.5a520.cn /yw.flv", "/yw.flv",5));
// System.out.println(myFtp.upload("http://www.5a520.cn /走西口24.mp4","/央视走西口/新浪网/走西口24.mp4"));
// System.out.println(download("/Book/架构设计/Java与模式(清晰书签版).pdf", "E:\\temp\\Java与模式(清晰书签版).pdf"));
DownloadStatus downStatus = download("/Book/架构设计/Java与模式(清晰书签版).pdf", "E:\\temp\\Java与模式(清晰书签版).pdf");
if(downStatus.equals(DownloadStatus.DOWNLOAD_NEW_SUCCESS)){
log.info("新下载文件成功!");
}
disconnect();
} catch (IOException e) {
System.out.println("连接FTP出错："+e.getMessage());
}
}
}
2、输出处理类， 可以从网上找到源码
/*
* Copyright 2001-2010 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*form : http://kickjava.com/src/examples/PrintCommandListener.java.htm#ixzz0v1nJPJdO
*/
package ftp.test.continueDown;
import java.io.PrintWriter;
import org.apache.commons.net.ProtocolCommandEvent;
import org.apache.commons.net.ProtocolCommandListener;
/***
* This is a support class for some of the example programs. It is
* a sample implementation of the ProtocolCommandListener interface
* which just prints out to a specified stream all command/reply traffic.
* <p>
***/
public class PrintCommandListener implements ProtocolCommandListener {
private PrintWriter __writer;
public PrintCommandListener(PrintWriter writer)
{
__writer = writer;
}
public void protocolCommandSent(ProtocolCommandEvent event) {
__writer.print(event.getMessage());
__writer.flush();
}
public void protocolReplyReceived(ProtocolCommandEvent event) {
__writer.print(event.getMessage());
__writer.flush();
}
}
