复制代码代码如下:
Paket org.load.download;
java.io.File importieren;
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;
öffentliche Klasse herunterladen {
public static void main(String[] args) {
neuer Thread(neues D("http://al.VeVB.COm:81/200812/tools/HA_LeapFTP.rar"))
.Start();
neuer Thread(
neues D(
„http://al.VeVB.COm:81/200812/tools/HA_LeapFTP.rar“)
.Start();
}
}
Klasse D implementiert Runnable {
private static final String PATH = "E://download";
private String-URL;
privater String fileName = null;
statisch {
if (!new File(PATH).exists()) {
neue Datei(PFAD).mkdirs();
}
}
öffentliches D(String-URL) {
this.url = url;
this.fileName = this.url.substring(this.url.lastIndexOf('/') + 1,
this.url.length()); // 得到文件名
}
public void download() wirft 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); // 设置连接超时
long localFileSize = this.getLocalFileSize();
final long remoteFileSize = this.getRemoteFileSize();
// 如果本地文件未下载完成，则断点下载
if (-1 != localFileSize && -1 != remoteFileSize
&& localFileSize < remoteFileSize) {
file.seek(localFileSize); // 本地标记
get.addHeader("Range", "bytes=" + localFileSize + "-"
+ remoteFileSize); // 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 != localFileSize && localFileSize >= remoteFileSize) {
zurückkehren;
}
// 开始下载
HttpResponse-Antwort = client.execute(get);
if (300 >= Response.getStatusLine().getStatusCode()) {
HttpEntity de = Response.getEntity();
InputStream in = en.getContent();
byte[] by = neues Byte[512];
int len = -1;
// 显示进度
neuer Thread(new Runnable(){
@Override
public void run() {
versuchen {
while (file.length() < remoteFileSize) {
//Runtime.getRuntime().exec("cmd cls"); // 听说会另起个进程
System.out.println(Dateiname
+ „已下载:/t“
+ neues DecimalFormat("0.00%").format(file
.length() / (double) remoteFileSize));
Thread.sleep(5000);
}
} Catch (IOException e) {
e.printStackTrace();
} Catch (InterruptedException e) {
e.printStackTrace();
}
}
}).Start();
// 开始下载
while (-1 != (len = in.read(by))) {
file.write(by, 0, len);
}
in.close();
client.getConnectionManager().shutdown();
}
}
// 得到本地文件大小
private long getLocalFileSize() {
Datei file = new File(PATH + File.separator + this.fileName);
if (!file.exists()) {
Rückkehr -1l;
}
return file.length();
}
// 得到远程文件大小
private long getRemoteFileSize() löst eine ClientProtocolException aus,
IOException {
HttpClient client = new DefaultHttpClient();
HttpGet get = new HttpGet(this.url);
client.getParams().setParameter("http.socket.timeout", 5000);
HttpResponse-Antwort = client.execute(get);
if (200 == Response.getStatusLine().getStatusCode()
|| 300 >= Response.getStatusLine().getStatusCode()) {
HttpEntity de = Response.getEntity();
return en.getContentLength();
}
Rückkehr -1l;
}
@Override
public void run() {
versuchen {
herunterladen();
System.out.println(this.fileName + "/t下载完成");
} Catch (ClientProtocolException e) {
e.printStackTrace();
} Catch (IOException e) {
e.printStackTrace();
}
}
}