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
