java 实现ftp的文件上传和删除

 

package com.tw.ftp;

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

import org.apache.commons.io.IOUtils;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPReply;

/**
 *<p>ftp连接管理(使用apache commons-net-1.4.1 lib)</p>
 *
 *
 */
public class FtpConManager {
	private static FtpConManager instance;
	private FTPClient ftpClient =null;
	
	/**
	 * get FtpConManager
	 * @return FtpConManager
	 */
	public synchronized static FtpConManager getInstance(){
		if( instance == null ){
			instance = new FtpConManager();
		}
		return instance;
	}

	
	/**
	 * <p>ftp登录</p>
	 * @param s_url ftp服务地址
	 * @param uname 用户名
	 * @param pass  密码
	 */
	public void login(String s_url,String uname,String pass){
		ftpClient = new FTPClient();
		try{
			//连接
			ftpClient.connect(s_url);
			ftpClient.login(uname,pass);
			//检测连接是否成功
			int reply = ftpClient.getReplyCode();
			if(!FTPReply.isPositiveCompletion(reply)) {
				this.closeCon();
				System.err.println("FTP server refused connection.");
				System.exit(1);
			}
		}catch(Exception ex){
			ex.printStackTrace();
			//关闭
			this.closeCon();
		}
	}
	
	
	/**
	 * <p>ftp上传文件</p>
	 * @param srcUrl 须上传文件
	 * @param targetFname 生成目标文件
	 * @return true||false
	 */
	public boolean uploadFile(String srcUrl,String targetFname){
		boolean flag = false;
		if( ftpClient!=null ){
			 File srcFile = new File(srcUrl); 
			 FileInputStream fis = null;
			 try {
				fis  = new FileInputStream(srcFile);
				
				//设置上传目录 
				ftpClient.changeWorkingDirectory("/ImData/");
	            ftpClient.setBufferSize(1024); 
	            ftpClient.setControlEncoding("GBK"); 
	            
	            //设置文件类型（二进制） 
	            ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
	            //上传
	            flag = ftpClient.storeFile(targetFname, fis); 
			} catch (Exception e) {
				e.printStackTrace();
				this.closeCon();
			}finally{
				IOUtils.closeQuietly(fis);
			}
		}
		return flag;
	}//end method uploadFile
	
	
	/**
	 * 
	 * <p>删除ftp上的文件</p>
	 * @param srcFname
	 * @return true || false
	 */
	public boolean removeFile(String srcFname){
		boolean flag = false;
		if( ftpClient!=null ){
			try {
				flag = ftpClient.deleteFile(srcFname);
			} catch (IOException e) {
				e.printStackTrace();
				this.closeCon();
			}
		}
		return flag;
	}
	
	/**
	 *<p>销毁ftp连接</p> 
	 */
	public void closeCon(){
		if(ftpClient !=null){
			if(ftpClient.isConnected()){
				try {
					ftpClient.logout();
					ftpClient.disconnect();
				} catch (IOException e) {
					e.printStackTrace();
				} 
			}
		}
	}
}

测试：

 

package com.tw.ftp;

/**
 * <p>使用apache commons-net-1.4.1 实现ftp上传功能</p>
 * @author tangw 2010-12-26
 *
 */
public class FtpNetTest {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		FtpConManager.getInstance().login("ftp服务地址", "登陆名", "密码");
		//boolean flag = FtpConManager.getInstance().uploadFile("d://aa.zip", "2342sd.zip");
		boolean flag = FtpConManager.getInstance().removeFile("/ImData2342sd.zip");
		System.out.println("操作结果:"+flag);
		//FtpConManager.getInstance().closeCon();

	}

}

所需jar包请从附件中下载