downloadthread.java

一个功能强大的Java多线程下载器 欢迎大家的光临 促进大家的学习交流 希望对大家有点帮助

package cc;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

public class DownLoadThread extends Thread {
	long[] start;

	long[] end;

	long filelength;

	File file;

	public DownLoadThread() {
		file = new File("d:/jifdetuo.mp3");
		start = new long[5];
		end = new long[5];
	}

	public void run() {
		filelength = getlength();
		if (filelength == 0) {
			System.out.println("error");
		} else if (filelength == -2) {
			System.out.println("error");
		} else {
			for (int i = 0; i < start.length; i++) {
				start[i] = i * (filelength / start.length);
			}
			for (int i = 0; i < end.length - 1; i++) {
				end[i] = start[i + 1];
			}
			end[end.length] = filelength;
		}
	}

	private long getlength() {
		URL url;
		long filelength = 0;

		try {
			url = new URL("http://www.daqiancn.com/images/解脱.MP3  ");
			HttpURLConnection con = (HttpURLConnection) url.openConnection();
			con.setRequestProperty("Uer-Agent", "NetFox");
			int responseCode = con.getResponseCode();
			if (responseCode >= 400) {
				return -2;
			}
			filelength = con.getContentLength();
		} catch (IOException e) {

			e.printStackTrace();
		}

		return filelength;
	}

}