it.sauronsoftware.ftp4j.FTPClient

package classTest;

import it.sauronsoftware.ftp4j.FTPClient;

import java.io.File;

public class FtpHandle {
	private FTPClient client = new FTPClient();
	
	/**
	 * 登录FTP，并返回登录是否成功的Boolean值
	 * @param host
	 * @param port
	 * @param user
	 * @param password
	 * @return
	 */
	public boolean login(String host, int port, String user, String password) {
		boolean flag = true;
		try {
			client.connect(host, port);
			client.login(user, password);
			//数据传输方式
			client.setType(FTPClient.TYPE_BINARY);
			client.setCharset("GBK");
		} catch (Exception e) {
			e.printStackTrace();
			flag = false;
		}
		return flag;
	}
	/**
	 * 关闭FTP连接
	 */
	public void close() {
		if(client.isConnected()) {
			try {
				client.disconnect(false);
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
	
	/**
	 * 在父级节点创建子节点目录，如果父级节点为根节点parent可以为空或“/”
	 * @param parent
	 * @param path
	 * @return
	 */
	public boolean makeDir(String parent, String path) {
		boolean flag = true;
		flag = cdAssignPath(parent);
		if(flag) {
			try {
				//创建已经存在的目录会报错
				client.createDirectory(path);
			}catch (Exception e) {
				e.printStackTrace();
				flag = false;
			}
		}
		return flag;
	}
	
	/**
	 * 上传文件
	 * @param path保存FTP位置
	 * @param file要上传的文件
	 */
	public void upload(String path, File file) {
		if(cdAssignPath(path)) {
			try {
				client.upload(file);
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
	
	/**
	 * 下载文件
	 * @param remotePath
	 * @param remoteName
	 * @param localPath
	 * @param localName
	 */
	public void download(String remotePath, String remoteName, String localPath, String localName) {
		if(cdAssignPath(remotePath)) {
			try {
				File file = new File(localPath);
				if(!file.exists()) {
					file.mkdirs();
				}
				client.download(remoteName, new File(localPath + "/" + localName));
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
	
	/**
	 * 获取指定路径下的文件列表
	 * @param path
	 * @return
	 */
	public String[] ls(String path) {
		try {
			if(cdAssignPath(path)) {
				return client.listNames();
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
	/**
	 * 切换当前目录当根目录
	 */
	private void cdRoot() {
		try {
			while(!"/".equals(client.currentDirectory())) {
				client.changeDirectoryUp();
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	/**
	 * 切换当前目录到指定路径，该路径必须从根路径开始
	 * @param path
	 * @return
	 */
	public boolean cdAssignPath(String path) {
		boolean flag = true;
		cdRoot();
		try {
			client.changeDirectory(path);
		} catch (Exception e) {
			e.printStackTrace();
			flag = false;
		}
		return flag;
	}
}