Apache FTP 实用代码（转）

dlsdlwvhvm

1.需要用到的jar
    commons-io-1.4.jar
    commons-net-1.4.1.jar
    commons-pool-1.3.jar
    jakarta-oro-2.0.8.jar
import java.io.File;
import java.io.IOException;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
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;
public class FtpHelper {
private FTPClient ftpClient = new FTPClient();   
/**
* 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();   
DownloadStatus result;   
//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;   
}   
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"));   
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);   
//TODO 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"));   
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
* @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();   
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){   //文件存在
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);   
//TODO 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) {
FtpHelper myFtp = new FtpHelper();   
try {   
myFtp.connect("192.168.1.166", 21, "test", "test");   
System.out.println(myFtp.upload("d:/test/信息反馈.txt","/信息反馈.txt"));  
myFtp.disconnect();   
} catch (IOException e) {   
System.out.println("连接FTP出错："+e.getMessage());   
e.printStackTrace();
}  
}
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   
}
public enum DownloadStatus {   
Remote_File_Noexist, //远程文件不存在   
Download_New_Success,    //下载文件成功   
Download_New_Failed,     //下载文件失败   
Local_Bigger_Remote,        //本地文件大于远程文件
Download_From_Break_Success, //断点续传成功   
Download_From_Break_Failed;   //断点续传失败   
}
}