使用apache实现ftp功能demo

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#apache #string #ftp服务器 #file #path #integer

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本文提供了一个基于Java的FTP客户端示例，包括连接、文件上传和下载等功能。通过FtpClient类管理连接池，FtpDownload类实现文件下载，FtpUpload类完成文件上传。

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ftp客户端类 FtpClient.java:

package org.crm.ftp;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import org.apache.commons.logging.LogFactory;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPReply;
import org.hi.framework.HiConfigHolder;

public class FtpClient {

	/**
	 * 在hiFrameworkConfig.properties配置文件中可设置ip、ftp的用户名、ftp的密码、root
	 */
	private final static String FTPIP = HiConfigHolder.getProperty("hi.upload.ftp.ip");
	private static int port = 21;
	private final static String FTPUSER = HiConfigHolder.getProperty("hi.upload.ftp.userName");
	private final static String FTPPWD = HiConfigHolder.getProperty("hi.upload.ftp.password");
	private final static String FTPROOT = HiConfigHolder.getProperty("hi.upload.ftp.root");
	private final static int CLIENTSIZE = Integer.parseInt(HiConfigHolder.getProperty("hi.upload.ftp.clientSize"));
	
	private static List<FTPClient> ftpLists = new ArrayList<FTPClient>();
	private static HashMap<FTPClient, Integer> ftpStatus = new HashMap<FTPClient, Integer >();// 0表示可用 1 表示不可用
	
	static { }
	
	/**
	* FunName:	连接服务器
	* @Author: sam
	* @Create Date: 2011-11-16
	 */
	public static void connect(FTPClient ftp) throws IOException {//必要时，可以设置编码为gbk
		try {
			ftp.connect(FTPIP, port);
			int reply = ftp.getReplyCode();//连接ftp后返回值类型
			if(!FTPReply.isPositiveCompletion(reply)) {
				ftp.disconnect();
				System.exit(0);//throw new IOException("服务器拒绝连接.");
			} else if(!ftp.login(FTPUSER, FTPPWD)) {
				ftp.logout();
				throw new IOException("FTP用户名或密码!");
			}
			ftp.setFileType(FTP.BINARY_FILE_TYPE);//使用二进制
			if(FTPROOT != null && !"".equals(FTPROOT.trim())) {
				ftp.changeWorkingDirectory(FTPROOT);//改变目录路径
			}
		} catch(IOException ex) {
			if(ftp.isConnected()) {
				try {
					ftp.disconnect();
				} catch(IOException ioex) {
					System.err.println("断开服务器连接失败");
				}
			}
			System.err.println(ex.getMessage());
		}
	}

	/**
	* FunName:	断开重新连接
	* @Author: sam
	* @Create Date: 2011-11-16
	 */
	public static void reConnect(FTPClient ftp) throws IOException {
		try{
			disConnect(ftp);
		}catch(IOException e){}
		connect(ftp);
	}
	
	/**
	* FunName:	断开连接
	* @Author: sam
	* @Create Date: 2011-11-16
	 */
	public static void disConnect(FTPClient ftp) throws IOException {
		try {
			ftp.noop(); // check that control connection is working OK
			ftp.logout();
		} catch(IOException ioe) {
			System.err.println(ioe.getMessage());
		} finally {
			if(ftp.isConnected()) System.err.println("FTP未断开连接");
		}
	}
	
	/**
	* FunName:	关闭ftp
	* @Author: sam
	* @Create Date: 2011-11-16
	 */
	public static void closeFtp(FTPClient ftp) throws IOException {
		if(ftpLists.indexOf(ftp) < 0) {
			disConnect(ftp);
		} else {
			ftpStatus.put(ftp, 0);
		}
	}

	/**
	* FunName:	获得一个ftp
	* @Author: sam
	* @Create Date: 2011-11-16
	 */
	public synchronized static FTPClient getFtpClient() throws IOException {
		FTPClient ftp = null;
		for(FTPClient client : ftpLists) {
			//判断当前client是否已经有连接
			if(ftpStatus.get(client) != null && ftpStatus.get(client).equals(new Integer(1))) {
				ftpStatus.put(client, 1);
				ftp = client;
				break;
			}
		}
		if(ftp == null) {
			//新建一个连接，放到ftpDownloads连接池
			try {
				FTPClient newClient = new FTPClient();
				connect(newClient);
				if(ftpLists.size() < CLIENTSIZE) {
					ftpLists.add(newClient);
					ftpStatus.put(newClient, 1);
					ftp = newClient;
				}
			} catch(IOException ioe) {
				LogFactory.getLog("/").error(ioe.getMessage());
			}
		}
		
		if(!ftp.isAvailable()) {//判断ftp是否还保持连接状态
			reConnect(ftp);
		} else {
			ftp.changeToParentDirectory();
			if(FTPROOT != null && !"".equals(FTPROOT.trim())) ftp.changeWorkingDirectory(FTPROOT);
		}
		return ftp;
	}
}

从ftp服务器下载文件    FtpDownload.java:
package org.crm.ftp;


import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;


import org.apache.commons.net.ftp.FTPClient;
import org.hi.framework.web.BusinessException;
import org.hi.i18n.util.I18NUtil;


/*
 * ftp文件下载
 */
public class FtpDownload {


	private FTPClient ftp;
	
	public FtpDownload() {//下载构造函数
		try {
			ftp = FtpClient.getFtpClient();
		} catch (IOException ioe) {
			throw new BusinessException(I18NUtil.getString("连接FTP服务器失败，原因:") + ioe.getMessage());
		}
	}
	
	/**
	* FunName:	以文件流形式下载
	* @Author: sam
	* @Create Date: 2011-11-16
	 */
	public InputStream getDownloadIS(String path) throws IOException {
		ByteArrayInputStream bais = null;
		
		ByteArrayOutputStream baos = null;
		try {
			baos = new ByteArrayOutputStream();
			ftp.retrieveFile(path, baos);
			bais = new ByteArrayInputStream(baos.toByteArray());
		} catch (IOException e) {//抛异常时，重新连接
			FtpClient.reConnect(ftp);
			baos = new ByteArrayOutputStream();
			ftp.retrieveFile(path, baos);
			bais = new ByteArrayInputStream(baos.toByteArray());
		} finally {
			bais.close();
			baos.flush();
			baos.close();
			FtpClient.closeFtp(ftp);
		}
		
		return bais;
	}
	
	/**
	* FunName:	以文件形式下载
	* @Author: sam
	* @Create Date: 2011-11-16
	 */
	public void getDownloadFile(String path, File file) throws IOException {
		FileOutputStream fos = new FileOutputStream(file);
		try {
			ftp.retrieveFile(path, fos);
		} catch (IOException e) {
			FtpClient.reConnect(ftp);
			ftp.retrieveFile(path, fos);
		} finally {
			fos.flush();
			fos.close();
			FtpClient.closeFtp(ftp);
		}
	}
}

上传文件到ftp服务器类    FtpUpload.java:
package org.crm.ftp;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.httpclient.util.URIUtil;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.hi.framework.web.BusinessException;
import org.hi.i18n.util.I18NUtil;

public class FtpUpload {

	private FTPClient ftp;
	
	public FtpUpload() {
		try {
			ftp = FtpClient.getFtpClient();
		} catch (IOException ioe) {
			throw new BusinessException(I18NUtil.getString("连接FTP服务器失败，原因:") + ioe.getMessage());
		}
	}
	
	/**
	 * 将文件保存到ftp并返回文件在ftp的地址
	 * @param is 要保存的文件的字节流
	 * @param fileName 文件名
	 * @param moduleName 保存在哪个目录中
	 * @throws IOException
	 */
	public String saveUploadIS(InputStream is, String fileName, String moduleName) throws IOException {
		if(moduleName == null || moduleName.equals("")) moduleName = "common";
		try {
			changeDir(moduleName);
			fileName = formateName(URIUtil.encodeQuery(fileName));//url编码
			ftp.storeUniqueFile(fileName, is);
		} catch (IOException ioe) {//出现异常，重新连接ftp
			FtpClient.reConnect(ftp);
			changeDir(moduleName);
			fileName = formateName(URIUtil.encodeQuery(fileName));//url编码
			ftp.storeUniqueFile(fileName, is);
		} finally {
			is.close();
			FtpClient.closeFtp(ftp);
		}
		
		return moduleName + "/" + fileName;
	}
	
	/**
	 * 将文件保存到ftp并返回文件在ftp的地址
	 * @param file 要保存的文件
	 * @param fileName 文件名
	 * @param moduleName 保存在哪个目录中
	 * @throws IOException
	 */
	public String saveUploadFile(File file, String fileName,String moduleName) throws IOException {
		FileInputStream fis = new FileInputStream(file);
		return saveUploadIS(fis, fileName, moduleName);
	}
	
	/**
	 * 将文件保存到ftp并返回文件在ftp的地址
	 * @param file 要保存的文件
	 * @throws IOException
	 */
	public String saveUploadFile(File file) throws IOException {
		String name = file.getName();
		return saveUploadFile(file, name, "attachment");
	}
	
	/*
	 * 文件上传到该目录
	 */
	private void changeDir(String dir) throws IOException {
		String sdir = serverDirs(dir);
		if(sdir == null || sdir.equals("")) {//目录不存在
			ftp.makeDirectory(dir);
			ftp.changeWorkingDirectory(dir);
		} else {
			ftp.changeWorkingDirectory(sdir);
		}
	}
	public String serverDirs(String dir) throws IOException {
		FTPFile[] dirs = ftp.mlistDir();
		if(dirs == null || dirs.length == 0) return "";
		for(FTPFile oldDir : dirs) {
			if(dir.equalsIgnoreCase(oldDir.getName())) return oldDir.getName();//这里不返回dir
		}
		return "";
	}
	
	private String formateName(String fileName) {
		String preName = "";//文件名，前缀
		String extName = "";//文件格式，后缀
		if(fileName.indexOf(".") < 0) preName = fileName;//没有格式文件
		else {
			preName = fileName.substring(0,fileName.lastIndexOf("."));
			extName = fileName.substring(fileName.lastIndexOf("."));
		}
		List<String> names = getFtpFiles("");
		int num = 1;
		while(names != null && names.contains(fileName)) {//重复文件改名
			fileName = preName + "(" + num + ")" + extName;
			num ++;
		}
		
		return fileName;
	}
	/*
	 * 获得相应目录下的所有文件
	 */
	public List<String> getFtpFiles(String path) {
		List<String> names = new ArrayList<String>();
		try {
			FTPFile[] ftpf = ftp.listFiles(path);
			for(FTPFile ff : ftpf) {
				names.add(ff.getName());
			}
		} catch (IOException ioe) {
			System.err.println(ioe.getMessage());
		}
		return names;
		
	}
}

一个测试类FtpTest.java:
package org.crm.ftp;


import java.io.File;
import java.io.IOException;


import org.junit.Test;


public class FtpTest{
	
	@Test
	public void test() {
		FtpDownload fd = new FtpDownload();
		try {
			fd.getDownloadFile("/attachment/675760a8gw1dl6d334nnxj(1).jpg", new File("d:/org.jpg"));
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	@Test
	public void upload() {
		FtpUpload fu = new FtpUpload();
		try {
			String path = fu.saveUploadFile(new File("d:/org.jpg"));
			System.err.println(path);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}


}