FtpUtil

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

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;

/**
 * @author E0395
 *
 */
public class FtpUtil {

	private static Logger logger = Logger.getLogger(FtpUtil.class);
	private static FTPClient ftp;
	/**
	 * 获取ftp连接
	 * @param f
	 * @return
	 * @throws Exception
	 */
	public static boolean connectFtp(Ftp f) throws Exception{
		ftp=new FTPClient();
		boolean flag=false;
		int reply;
		if (f.getPort()==null) {
			ftp.connect(f.getIpAddr(),21);
		}else{
			ftp.connect(f.getIpAddr(),f.getPort());
		}
		ftp.login(f.getUserName(), f.getPwd());
		ftp.setFileType(FTPClient.BINARY_FILE_TYPE);
		reply = ftp.getReplyCode();      
	    if (!FTPReply.isPositiveCompletion(reply)) {      
	          ftp.disconnect();      
	          return flag;      
	    }      
	    ftp.changeWorkingDirectory(f.getPath());      
	    flag = true;      
	    return flag;
	}
	
	/**
	 * 关闭ftp连接
	 */
	public static void closeFtp(){
		if (ftp!=null && ftp.isConnected()) {
			try {
				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{
		ftp.enterLocalPassiveMode();
		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()+"/"+fstr);
				if (file1.isDirectory()) {
					upload(file1);
					ftp.changeToParentDirectory();
				}else{
					File file2=new File(f.getPath()+"/"+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 startDown(Ftp f,String localBaseDir,String remoteBaseDir,String fileName) throws Exception{
		
		if (FtpUtil.connectFtp(f)) {
	        try { 
	            FTPFile[] files = null; 
	            ftp.enterLocalPassiveMode();//本地模式
	            boolean changedir = ftp.changeWorkingDirectory(remoteBaseDir); 
	            if (changedir) { 
	                ftp.setControlEncoding("GBK"); 
	                ftp.setFileType(FTPClient.BINARY_FILE_TYPE);
	                files = ftp.listFiles(); 
	                
	                for (int i = 0; i < files.length; i++) { 
	                    try{ 
	                    	if(files[i].getName().equals(fileName)) {
	                    		downloadFile(files[i], localBaseDir, remoteBaseDir); 
	                    	}
	                    }catch(Exception e){ 
	                    	logger.error(e); 
	                    	logger.error("<"+files[i].getName()+">下载失败"); 
	                    	e.printStackTrace();
	                    } 
	                } 
	            } 
	        } catch (Exception e) { 
	        	logger.error(e); 
	        	logger.error("下载过程中出现异常"); 
	        	e.printStackTrace();
	        } 
		}else{
			logger.error("链接失败！");
			System.out.println("链接失败！");
		}
		
	}

	
	/** 
     * 
     * 下载FTP文件 
     * 当你需要下载FTP文件的时候，调用此方法 
     * 根据<b>获取的文件名，本地地址，远程地址</b>进行下载 
     * 
     * @param ftpFile 
     * @param relativeLocalPath 
     * @param relativeRemotePath 
     */ 
    private  static void downloadFile(FTPFile ftpFile, String relativeLocalPath,String relativeRemotePath) { 
    	System.out.println("开始下载");
        if (ftpFile.isFile()) {
        	InputStream in = null ;
        	FileOutputStream bos = null;
			try {
				in = ftp.retrieveFileStream(ftpFile.getName());
				File file = new File(relativeLocalPath + ftpFile.getName());
				file.getParentFile().mkdirs();
				bos = new FileOutputStream(file);
				byte[] len= new byte[1024*2];
				int read = 0;
				while((read = in.read(len)) != -1) {
					bos.write(len,0,read);
				}
			} catch (FileNotFoundException e) {
				logger.error("文件未找到",e);
				e.printStackTrace();
			} catch (IOException e) {
				logger.error("IO异常",e);
				e.printStackTrace();
			}finally {
				try {
					if(in!=null) {
						in.close();
					}
					if(bos!=null) {
						bos.close();
					}
				} catch (IOException e) {
					logger.error("关闭异常",e);
					e.printStackTrace();
				}
			}
    		
        } else { 
            String newlocalRelatePath = relativeLocalPath + ftpFile.getName(); 
            String newRemote = new String(relativeRemotePath+ ftpFile.getName().toString()); 
            File fl = new File(newlocalRelatePath); 
            if (!fl.exists()) { 
                fl.mkdirs(); 
            } 
            try { 
                newlocalRelatePath = newlocalRelatePath + '/'; 
                newRemote = newRemote + "/"; 
                String currentWorkDir = ftpFile.getName().toString(); 
                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) { 
                logger.error("创建文件夹异常",e);
                e.printStackTrace();
            } 
        } 
        System.out.println("下载完毕");
    } 

	
//	public static void main(String[] args) throws Exception{  
//			Ftp f=new Ftp();
//			f.setIpAddr("10.12.100.95");
//			f.setUserName("silu");
//			f.setPwd("silu@12345");
//			FtpUtil.connectFtp(f);
////			File file = new File("E:/ftp/tpxw/201902/123.png");  
////			FtpUtil.upload(file);//把文件上传在ftp上    \pub\nwzd\qjlm\tpxw\to-left - 副本.png
//			FtpUtil.startDown(f, "e:\\ftp\\test\\",  "/nwzd/qjlm/ztzl","rss_40.xml");//下载ftp文件测试
//			System.out.println("下载完成");
//	   }  

}

Ftp

public class Ftp {

    private String ipAddr;//ip地址
    
    private Integer port;//端口号
    
    private String userName;//用户名
    
    private String pwd;//密码
    
    private String path;//aaa路径

    public String getIpAddr() {
        return ipAddr;
    }

    public void setIpAddr(String ipAddr) {
        this.ipAddr = ipAddr;
    }

    public Integer getPort() {
        return port;
    }

    public void setPort(Integer port) {
        this.port = port;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPwd() {
        return pwd;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }
}