FTP自动上传
在指定目录下如果有一个新的文件就上传到服务器中 怎么实现
[解决办法]
用apache包:
package com.test.project.ftp;
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.logging.Log;
import org.apache.commons.logging.LogFactory;
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;
/**
* 支持断点续传的FTP实用类 实现基本断点上传下载,支持上传下载进度
*
* @author guishuanglin 2009-04-2
*/
public class MyFTPClient {
private Log logger = LogFactory.getLog(this.getClass());
private String fileSplit = "/";
private FTPClient ftpClient = new FTPClient();
public MyFTPClient() {
// 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, String charEncoding) throws IOException {
ftpClient.connect(hostname, port);
ftpClient.setControlEncoding(charEncoding);
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.
* @param fileName 文件名,如：file.txt
* @param localPath 本地文件路径
* 使用/home/der/dir或是
* http://www.baidu.com/dir
* @param remotePath 远程文件路径,不包括文件名
* @return
* @throws IOException
*/
public boolean download(String fileName, String localDir, String remoteDir)
throws IOException {
String localFile = localDir + this.fileSplit + fileName;
String remoteFile = remoteDir + this.fileSplit + fileName;
// 设置被动模式
ftpClient.enterLocalPassiveMode();
// 设置以二进制方式传输
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
// 检查远程文件是否存在
FTPFile[] files = ftpClient.listFiles(remoteFile);
if (files.length < 1) {
logger.error("远程文件不存在");
return false;
}
long remoteSize = files[0].getSize();
File f = new File(localFile);
// 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 >= remoteSize) {
logger.error("本地文件大于远程文件，下载中止");
return true;
}
// 进行断点续传，并记录状态
FileOutputStream out = new FileOutputStream(f, true);
ftpClient.setRestartOffset(localSize);
InputStream in = ftpClient.retrieveFileStream(remoteFile);
logger.info("下载文件开始");
boolean result = this.downloadFile(in, remoteSize, out, localSize,
ftpClient);
if (result) {
logger.info("下载文件完成");
return true;
} else {
logger.error("下载文件失败");
return false;
}
} else {
OutputStream out = new FileOutputStream(f);
InputStream in = ftpClient.retrieveFileStream(remoteFile);
logger.info("下载文件开始");
boolean result = this.downloadFile(in, remoteSize, out, 0,
ftpClient);
if (result) {
logger.info("下载文件完成");
return true;
} else {
logger.error("下载文件失败");
return false;
}
}
}
private boolean downloadFile(InputStream in, long inSize, OutputStream out,
long outSize, FTPClient ftpClient) throws IOException {
long step = inSize / 100;
long process = 0;
long readbytes = 0L;
//防止除0错误
if(step==0)
step = 1;
// 断点续传
if (outSize > 0) {
System.out.println("文件存在，可进行断点续传.");
ftpClient.setRestartOffset(outSize);
process = outSize / step;
readbytes = outSize;
}
byte[] bytes = new byte[1024];
int c;
while ((c = in.read(bytes)) != -1) {
out.write(bytes, 0, c);
readbytes += c;
long nowProcess = readbytes / step;
if (nowProcess > process) {
process = nowProcess;
if (process > 0 && process % 10 == 0) {
if (process == 100) {
System.out.println(process + "%");
System.out.println("完成进度:" + process + "%");
} else
System.out.print(process + "%");
} else {
System.out.print(".");
}
}
}
in.close();
out.close();
return ftpClient.completePendingCommand();
}
/**
* 上传文件到FTP服务器，支持断点续传
* @param fileName 文件名,如：file.txt
* @param localPath 本地文件路径
* 使用/home/der/dir或是
* http://www.baidu.com/dir
* @param remotePath 远程文件路径,不包括文件名
* @return
* @throws IOException
*/
public boolean upload(String fileName, String localDir, String remoteDir)
throws IOException {
String localFile = localDir + this.fileSplit + fileName;
String remoteFile = remoteDir + this.fileSplit + fileName;
// 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);
// 检查远程是否存在文件
FTPFile[] files = ftpClient.listFiles(remoteFile);
if (files.length >= 1) {
long remoteSize = files[0].getSize();
File f = new File(localFile);
long localSize = f.length();
if (remoteSize == localSize) {
logger.info("远程文件已存在,上载完成");
return true;
} else if (remoteSize > localSize) {
logger.error("远程文件大于本地文件,上载完成");
return true;
}
// 尝试移动文件内读取指针,实现断点续传
boolean result = uploadFile(remoteFile, 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) {
if (ftpClient.deleteFile(remoteFile)) {
logger.error("远程文件存在,续传失败,已删除文件重转");
return uploadFile(remoteFile, f, ftpClient, 0);
} else {
logger.error("远程文件存在,续传失败,删除文件进行重转,但删除失败.");
return false;
}
} else {
return result;
}
} else {
return uploadFile(remoteFile, new File(localFile), ftpClient, 0);
}
}
/**
* 上传文件到服务器,新上传和断点续传
*
* @param remotePath
* 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 localPath
* 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
*/
private boolean uploadFile(String remotePath, File localPath,
FTPClient ftpClient, long remoteSize) throws IOException {
// 显示进度的上传
long step = localPath.length() / 100;
long process = 0;
long localreadbytes = 0L;
RandomAccessFile raf = new RandomAccessFile(localPath, "r");
OutputStream out = ftpClient.appendFileStream(remotePath);
//防止除0错误
if(step==0)
step = 1;
// 断点续传
if (remoteSize > 0) {
System.out.println("文件存在，可进行断点续传.");
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;
if (process > 0 && process % 10 == 0) {
if (process == 100) {
System.out.println(process + "%");
System.out.println(" 上传进度:" + process + "%");
} else
System.out.print(process + "%");
} else {
System.out.print(".");
}
}
}
out.flush();
raf.close();
out.close();
boolean result = ftpClient.completePendingCommand();
if (result) {
logger.info("上传文件完成");
return true;
} else {
logger.error("上传文件失败");
return false;
}
}
/**
* 断开与远程服务器的连接
*
* @throws IOException
*/
public void disconnect() throws IOException {
if (ftpClient.isConnected()) {
ftpClient.disconnect();
}
}
/** 文件重名称,移动目录,根据目录用'/'代替 */
public boolean rename(String from, String to){
try {
return ftpClient.rename(from, to);
} catch (IOException e) {
e.printStackTrace();
return false;
}
}
public static void main(String[] args) {
MyFTPClient myFtp = new MyFTPClient();
try {
//
} catch (IOException e) {
System.out.println("连接FTP出错：" + e.getMessage());
}
}
}
