package org.load.download;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.text.DecimalFormat;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
public class Download {
public static void main(String[] args) {
new Thread(new D("http://al.jb51.net:81/200812/tools/HA_LeapFTP.rar"))
.start();
new Thread(
new D(
"http://al.jb51.net:81/200812/tools/HA_LeapFTP.rar"))
.start();
}
}
class D implements Runnable {
private static final String PATH = "E:\download";
private String url;
private String fileName = null;
static {
if (!new File(PATH).exists()) {
new File(PATH).mkdirs();
}
}
public D(String url) {
this.url = url;
this.fileName = this.url.substring(this.url.lastIndexOf('/') + 1,
this.url.length()); //Get the file name
}
public void download() throws ClientProtocolException, IOException {
final RandomAccessFile file = new RandomAccessFile(this.PATH + File.separator
+ this.fileName, "rw");
HttpClient client = new DefaultHttpClient();
HttpGet get = new HttpGet(this.url);
// client.getParams().setParameter("http.socket.timeout", 5000); // Set connection timeout
long localFileSize = this.getLocalFileSize();
final long remoteFileSize = this.getRemoteFileSize();
//Breakpoint downloads if the local file is not downloaded
if (-1 != localFileSize && -1 != remoteFileSize
&& localFileSize < remoteFileSize) {
file.seek(localFileSize); //Local mark
get.addHeader("Range", "bytes=" + localFileSize + "-"
+ remoteFileSize); //Remote tag
}
//If the local file size is greater than or equal to the remote file, the download is complete
if (-1 != localFileSize && localFileSize >= remoteFileSize) {
return;
}
//Start the download
HttpResponse response = client.execute(get);
if (300 >= response.getStatusLine().getStatusCode()) {
HttpEntity en = response.getEntity();
InputStream in = en.getContent();
byte[] by = new byte[512];
int len = -1;
//According to schedule
new Thread(new Runnable(){
@Override
public void run() {
try {
while (file.length() < remoteFileSize) {
// Runtime.getRuntime().exec("cmd cls"); // I heard there will be another process
System.out.println(fileName
+ " Download: t"
+ new DecimalFormat("0.00%").format(file
.length() / (double) remoteFileSize));
Thread.sleep(5000);
}
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).start();
//Start the download
while (-1 != (len = in.read(by))) {
file.write(by, 0, len);
}
in.close();
client.getConnectionManager().shutdown();
}
}
//Gets the local file size
private long getLocalFileSize() {
File file = new File(PATH + File.separator + this.fileName);
if (!file.exists()) {
return -1l;
}
return file.length();
}
//Gets the remote file size
private long getRemoteFileSize() throws ClientProtocolException,
IOException {
HttpClient client = new DefaultHttpClient();
HttpGet get = new HttpGet(this.url);
client.getParams().setParameter("http.socket.timeout", 5000);
HttpResponse response = client.execute(get);
if (200 == response.getStatusLine().getStatusCode()
|| 300 >= response.getStatusLine().getStatusCode()) {
HttpEntity en = response.getEntity();
return en.getContentLength();
}
return -1l;
}
@Override
public void run() {
try {
download();
System.out.println(this.fileName + "t The download is complete ");
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}