复制代码代码如下:
paket org.load.download;
impor java.io.File;
impor java.io.IOException;
impor java.io.InputStream;
impor java.io.RandomAccessFile;
impor java.teks.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;
kelas publik Unduh {
public static void main(String[] args) {
Utas baru(D baru("http://al.VeVB.COM:81/200812/tools/HA_LeapFTP.rar"))
.awal();
rangkaian pesan baru(
D baru(
"http://al.VeVB.COM:81/200812/tools/HA_LeapFTP.rar"))
.awal();
}
}
kelas D mengimplementasikan Runnable {
String akhir statis pribadi PATH = "E://download";
url String pribadi;
pribadi String fileName = null;
statis {
jika (!File baru(PATH).ada()) {
File baru(PATH).mkdirs();
}
}
publik D(String url) {
ini.url = url;
ini.namafile = ini.url.substring(ini.url.lastIndexOf('/') + 1,
ini.url.panjang()); // 得到文件名
}
unduhan kekosongan publik() melempar ClientProtocolException, IOException {
file RandomAccessFile terakhir = RandomAccessFile baru (ini.PATH + File.separator
+ ini.NamaFile, "rw");
Klien HttpClient = DefaultHttpClient();
HttpGet dapatkan = HttpGet baru(ini.url);
//client.getParams().setParameter("http.socket.timeout", 5000); // 设置连接超时
panjang localFileSize = ini.getLocalFileSize();
final long remoteFileSize = this.getRemoteFileSize();
// 如果本地文件未下载完成，则断点下载
jika (-1 != Ukuran File Lokal && -1 != Ukuran File Jarak Jauh
&& ukuranFile lokal < UkuranFile jarak jauh) {
file.seek(localFileSize); // 本地标记
dapatkan.addHeader("Rentang", "bytes=" + localFileSize + "-"
+ Ukuran File jarak jauh); // 远程标记
}
// 如果本地文件大小大于等于远程文件,则已经下载完成
if (-1 != ukuran File lokal && Ukuran File lokal >= Ukuran File jarak jauh) {
kembali;
}
// 开始下载
Respons HttpResponse = client.execute(dapatkan);
jika (300 >= respon.getStatusLine().getStatusCode()) {
HttpEntity en = respon.getEntity();
InputStream di = en.getContent();
byte[] oleh = byte baru[512];
int len = -1;
// 显示进度
Thread baru(Runnable baru(){
@Mengesampingkan
menjalankan kekosongan publik() {
mencoba {
while (file.length() < remoteFileSize) {
//Runtime.getRuntime().exec("cmd cls"); // 听说会另起个进程
System.out.println(namafile
+ "已下载：/t"
+ DecimalFormat baru ("0,00%").format(file
.length() / (ganda) remoteFileSize));
Thread.tidur(5000);
}
} tangkapan (IOException e) {
e.printStackTrace();
} tangkapan (InterruptedException e) {
e.printStackTrace();
}
}
}).awal();
// 开始下载
while (-1 != (len = masuk.baca(oleh))) {
file.write(oleh, 0, len);
}
melampirkan();
klien.getConnectionManager().shutdown();
}
}
// 得到本地文件大小
pribadi panjang getLocalFileSize() {
File file = File baru (PATH + File.separator + this.fileName);
if (!file.ada()) {
kembali -1l;
}
return file.panjang();
}
// 得到远程文件大小
getRemoteFileSize() panjang pribadi menampilkan ClientProtocolException,
IOException {
Klien HttpClient = DefaultHttpClient();
HttpGet dapatkan = HttpGet baru(ini.url);
klien.getParams().setParameter("http.socket.timeout", 5000);
Respons HttpResponse = client.execute(dapatkan);
if (200 == respon.getStatusLine().getStatusCode()
|| 300 >= respon.getStatusLine().getStatusCode()) {
HttpEntity en = respon.getEntity();
kembali en.getContentLength();
}
kembali -1l;
}
@Mengesampingkan
menjalankan kekosongan publik() {
mencoba {
unduh();
System.out.println(ini.namafile + "/t下载完成");
} tangkapan (ClientProtocolException e) {
e.printStackTrace();
} tangkapan (IOException e) {
e.printStackTrace();
}
}
}