FtpUtil.java

package FTPDemo;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.logging.Logger;

import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;

public class FtpUtil {

private static FTPClient ftp;

/**
* 获取ftp连接
* @param f
* @return
* @throws Exception
*/
public static boolean connectFtp(FtpConfig f) throws Exception{
ftp=new FTPClient();
boolean flag=false;
if (f.getFtpPort()==null) {
ftp.connect(f.getFtpHost(),21);
}else{
ftp.connect(f.getFtpHost(),f.getFtpPort());
}
ftp.login(f.getFtpUser(), f.getFtpPassword());
ftp.enterLocalPassiveMode(); //被动模式
int reply = ftp.getReplyCode();
if (!FTPReply.isPositiveCompletion(reply)) {
ftp.disconnect();
return flag;
}
ftp.changeWorkingDirectory(f.getFtpPath());
flag = true;
return flag;
}

/**
* 关闭ftp连接
*/
public static void closeFtp(){
try {
if (ftp!=null && ftp.isConnected()) {
ftp.logout();
ftp.disconnect();
}
}catch (IOException e){
e.printStackTrace();
}
}

/**
* ftp上传文件
* @param f
* @throws Exception
*/
public static void upload(File f) throws Exception{
if (f.isDirectory()) {
ftp.makeDirectory(f.getName());
ftp.changeWorkingDirectory(f.getName());
String[] files=f.list();
for(String fstr : files){
File file1=new File(f.getPath()+File.separator+fstr);
if (file1.isDirectory()) {
upload(file1);
ftp.changeToParentDirectory();
}else{
File file2=new File(f.getPath()+File.separator+fstr);
FileInputStream input=new FileInputStream(file2);
ftp.storeFile(file2.getName(),input);
input.close();
}
}
}else{
File file2=new File(f.getPath());
FileInputStream input=new FileInputStream(file2);
ftp.storeFile(file2.getName(),input);
input.close();
}
}

/**
* 下载链接配置
* @param f
* @param localBaseDir 本地目录
* @param remoteBaseDir 远程目录
* @throws Exception
*/
public static void startDownDir(FtpConfig f,String localBaseDir,String remoteBaseDir) throws Exception{
if (FtpUtil.connectFtp(f)) {
try {
FTPFile[] files = null;
boolean changedir = ftp.changeWorkingDirectory(remoteBaseDir);
if (changedir) {
ftp.setControlEncoding(“UTF-8”);
files = ftp.listFiles();
for (int i = 0; i < files.length; i++) { downloadFile(files[i], localBaseDir, remoteBaseDir); } }else{ System.out.println("不存在的相对路径!"); } } catch (Exception e) { e.printStackTrace(); } }else{ System.out.println("连接失败"); } } public static void startDownFile(FtpConfig f,String localBaseDir,String remoteFilePath) throws Exception{ if (FtpUtil.connectFtp(f)) { try { FileOutputStream outputStream = new FileOutputStream(localBaseDir + remoteFilePath); ftp.retrieveFile(remoteFilePath, outputStream); outputStream.flush(); outputStream.close(); } catch (Exception e) { e.printStackTrace(); } }else{ System.out.println("连接FTP服务器失败"); } } /** * * 下载FTP文件 * 当你需要下载FTP文件的时候,调用此方法 * 根据获取的文件名,本地地址,远程地址进行下载
*
* @param ftpFile
* @param relativeLocalPath 下载到本地的绝对路径
* @param relativeRemotePath 要下载的远程ftp服务器相对路径
*/
private static void downloadFile(FTPFile ftpFile, String relativeLocalPath,String relativeRemotePath) {
if (ftpFile.isFile()) {
if (ftpFile.getName().indexOf(“?”) == -1) {
OutputStream outputStream = null;
try {
File locaFile= new File(relativeLocalPath+ ftpFile.getName());
//判断文件是否存在,存在则返回 or 直接覆盖
if(locaFile.exists()){
return;
}else{
outputStream = new FileOutputStream(relativeLocalPath+ ftpFile.getName());
ftp.retrieveFile(ftpFile.getName(), outputStream);
outputStream.flush();
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (outputStream != null){
outputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
} else {
String newlocalRelatePath = relativeLocalPath + ftpFile.getName();
String newRemote = relativeRemotePath + ftpFile.getName().toString();
File fl = new File(newlocalRelatePath);
if (!fl.exists()) {
fl.mkdirs();
}
try {
newlocalRelatePath = newlocalRelatePath+File.separator;
newRemote = newRemote+File.separator;
String currentWorkDir = ftpFile.getName().toString();
//System.out.println(currentWorkDir);
boolean changedir = ftp.changeWorkingDirectory(currentWorkDir);
if (changedir) {
FTPFile[] files = null;
files = ftp.listFiles();
for (int i = 0; i < files.length; i++) { downloadFile(files[i], newlocalRelatePath, newRemote); } } if (changedir){ ftp.changeToParentDirectory(); } } catch (Exception e) { e.printStackTrace(); } } } public static void main(String[] args) throws Exception{ FtpConfig f=new FtpConfig(); f.setFtpHost("192.168.3.100"); f.setFtpPort(21); f.setFtpUser("anonymous"); f.setFtpPassword(""); // f.setFtpPath("/data1/");//相对路径 FtpUtil.connectFtp(f); File file = new File("E:\\data1\\physics.txt"); //FtpUtil.upload(file);//把文件上传在ftp上 // FtpUtil.startDownFile(f, "E:/", "physics.txt"); FtpUtil.startDownDir(f, "E:/data1/", "/data1/"); } }

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