关于ftp和http下载断点续传

FTP下载断点续传

import java.io.BufferedInputStream;
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 java.io.OutputStream;
import java.net.SocketTimeoutException;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.TimeZone;
import java.util.regex.Pattern;

import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPClientConfig;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPFileFilter;
import org.apache.commons.net.ftp.FTPReply;
import org.apache.log4j.Logger;

public class ApacheFtpUtil {
	private FTPClient ftpClient;
	private String strIp;
	private int intPort;
	private String user;
	private String password;
	
	private static Logger logger = Logger.getLogger(ApacheFtpUtil.class.getName());

	/* *
	 * Ftp构造函数
	 */
	public ApacheFtpUtil(String strIp, int intPort, String user, String Password) {
		this.strIp = strIp;
		this.intPort = intPort;
		this.user = user;
		this.password = Password;
		this.ftpClient = new FTPClient();
	}
	
	public ApacheFtpUtil(String strIp, int intPort) {
		this.strIp = strIp;
		this.intPort = intPort;
		this.user = "anonymous";
		this.password = "anonymous";
		this.ftpClient = new FTPClient();
	}
	/**
	 * @return 判断是否登入成功
	 * */
	public boolean connectServer() {
		boolean isLogin = false;
		FTPClientConfig ftpClientConfig = new FTPClientConfig();
		ftpClientConfig.setServerTimeZoneId(TimeZone.getDefault().getID());
		this.ftpClient.setControlEncoding("GBK");
		this.ftpClient.configure(ftpClientConfig);
		try {
			if (this.intPort > 0) {
				this.ftpClient.connect(this.strIp, this.intPort);
			} else {
				this.ftpClient.connect(this.strIp);
			}
			// FTP服务器连接回答
			int reply = this.ftpClient.getReplyCode();
			if (!FTPReply.isPositiveCompletion(reply)) {
				this.ftpClient.disconnect();
				throw new IOException("Can't connect to server '" + this.strIp + "'");
			}
			
			isLogin = this.ftpClient.login(this.user, this.password);
			if(!isLogin){
				closeServer();
	            throw new IOException("Can't login to server '" + this.strIp + "'");
			}
			
			// 设置传输协议
			this.ftpClient.enterLocalPassiveMode();
			this.ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
			logger.info("恭喜" + this.user + "成功登陆FTP服务器:"+ftpClient.printWorkingDirectory());
		} catch (Exception e) {
			e.printStackTrace();
			logger.error(this.user + "登录FTP服务失败！" + e.getMessage());
			closeServer();
		}
		this.ftpClient.setBufferSize(1024 * 8);
		this.ftpClient.setConnectTimeout(30 * 1000);
		this.ftpClient.setDataTimeout(60 * 1000);
		return isLogin;
	}

	/**
	 * @退出关闭服务器链接
	 * */
	public void closeServer() {
		if (null != this.ftpClient && this.ftpClient.isConnected()) {
			try {
				boolean reuslt = this.ftpClient.logout();// 退出FTP服务器
				if (reuslt) {
					logger.info("成功退出服务器");
				}
			} catch (IOException e) {
				e.printStackTrace();
				logger.warn("退出FTP服务器异常！" + e.getMessage());
			} finally {
				try {
					this.ftpClient.disconnect();//