package cn.eason.util.common;
import
java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import org.apache.commons.net.PrintCommandListener;
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;
/**************************************************************
* 文件名称: ContinueFTP.java
* 功能描述: ftp文件上传功能，依赖commons-net-3.1.jar实现
* 创建日期: 2012-5-21
* 创建地址: 西安
* 作者: Eric.Hao
**************************************************************/
public class ContinueFTP {
private 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)));
}
/**
*
java编程中用于连接到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 {
//连接到FTP服务器
ftpClient.connect(hostname, port);
//如果采用默认端口，可以使用ftp.connect(url)的方式直接连接FTP服务器
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,支持断点续传功能
* @param remote 远程文件路径
* @param local 本地文件路径
* @param mode
tb传输方式：PassiveMode方式，ActiveMode方式
* @return 是否成功
* @throws IOException
*/
public DownloadStatus download(String remote,String local,String mode) throws IOException{
//设置ftp传输方式
if(mode.equalsIgnoreCase("P")){
//PassiveMode传输
ftpClient.enterLocalPassiveMode();
}
else {
//ActiveMode传输
ftpClient.enterLocalActiveMode();
}
//设置以二进制流的方式传输
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
//下载状态
DownloadStatus result;
//本地文件列表
File f = new File(local);
//检查远程文件是否存在
FTPFile[] files = ftpClient.listFiles(new String(remote.getBytes("GBK"),"iso-8859-1"));
if(files.length != 1){
System.out.println("远程文件不存在");
return DownloadStatus.Remote_File_Noexist;
}
//获得远端文件大小
long lRemoteSize = files[0].getSize();
//构建输出对象
OutputStream ut = null ;
//本地存在文件，进行断点下载 ；不存在则新下载
if(f.exists()){
//构建输出对象
out = new FileOutputStream(f,true);
//本地文件大小
long localSize = f.length();
System.out.println("本地文件大小为:"+localSize);
//判定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;
}
//否则进行断点续传，并记录状态
ftpClient.setRestartOffset(localSize);
InputStream in = ftpClient.retrieveFileStream(new String(remote.getBytes("GBK"),"iso-8859-1"));
byte[] bytes = new byte[1024];
long step = lRemoteSize /100;
//存放下载进度
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);
//TODO 更新文件下载进度,值存放在process变量中
}
}
//下载完成关闭输入输出流对象
in.close();
out.close();
boolean isDo = ftpClient.completePendingCommand();
if(isDo){
result = DownloadStatus.Download_From_Break_Success;
}else {
result = DownloadStatus.Download_From_Break_Failed;
}
}else {
out = new FileOutputStream(f);
InputStream in= ftpClient.retrieveFileStream(new String(remote.getBytes("GBK"),"iso-8859-1"));
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);
//TODO 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 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
* @param mode 传输方式：PassiveMode方式，ActiveMode方式
* @return 上传结果
* @throws IOException
*/
public UploadStatus upload(String local,String remote,String mode) 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);
UploadStatus result;
//对远程目录的处理
String remoteFileName = remote;
if(remote.contains("/")){
remoteFileName = remote.substring(remote.lastIndexOf("/")+1);
String directory = remote.substring(0,remote.lastIndexOf("/")+1);
if(!directory.equalsIgnoreCase("/")&&!ftpClient.changeWorkingDirectory(directory)){
//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 = remote.substring(start,end);
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;
}
}
}
}
//检查远程是否存在文件
FTPFile[] files = ftpClient.listFiles(remoteFileName);
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
InputStream is = new FileInputStream(f);
if(is.skip(remoteSize)==remoteSize){
ftpClient.setRestartOffset(remoteSize);
if(ftpClient.storeFile(remote, is)){
return UploadStatus.Upload_From_Break_Success;
}
}
//如果断点续传没有成功，则删除服务器上文件，重新上传
if(!ftpClient.deleteFile(remoteFileName)){
return UploadStatus.Delete_Remote_Faild;
}
is = new FileInputStream(f);
if(ftpClient.storeFile(remote, is)){
result = UploadStatus.Upload_New_File_Success;
}else{
result = UploadStatus.Upload_New_File_Failed;
}
is.close();
}else {
InputStream is = new FileInputStream(local);
if(ftpClient.storeFile(remoteFileName, is)){
result = UploadStatus.Upload_New_File_Success;
}else{
result = UploadStatus.Upload_New_File_Failed;
}
is.close();
}
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();
}
}