import java.net.*;import java.io.*; public class FilesDownLoad { public static void main (String args[]) { String logo="http://www.google.com/images/hp0.gif"; try {
URL root = new URL(logo);
saveBinaryFile(root);//下载文件
}
catch (MalformedURLException e) {
System.err.println(logo + " 不是一个Http 类型的URL .");
}
catch (IOException e) {
System.err.println(e);
}
} public static void saveBinaryFile(URL u) throws IOException {
URLConnection uc = u.openConnection();
String contentType = uc.getContentType();
int contentLength = uc.getContentLength();//取得文件大小
InputStream in = new BufferedInputStream(uc.getInputStream());
public class FilesDownLoad
{ public static void main (String args[])
{
String logo="http://www.google.com/images/hp0.gif";
try
{
URL root = new URL(logo);
saveBinaryFile(root);//下载文件
}
catch (MalformedURLException e)
{
System.err.println(logo + " 不是一个Http 类型的URL .");
}
catch (IOException e)
{
System.err.println(e);
}
}
public static void saveBinaryFile(URL u) throws IOException
{
URLConnection uc = u.openConnection();
String contentType = uc.getContentType();
int contentLength = uc.getContentLength();//取得文件大小
InputStream in = new BufferedInputStream(uc.getInputStream());
String filename = u.getFile();
//获取URL 文件名 如http://www.google.com/images/hp0.gif
filename = filename.substring(filename.lastIndexOf('/') + 1);
//去除http://www.google.com/images/
FileOutputStream fout = new FileOutputStream(filename);//文件存在程序运行目录下
byte[] data = new byte[1024];
int bytesRead = 0;
int bytesTotalRead=0;
while (bytesTotalRead < contentLength)
{
bytesRead = in.read(data);//从输入流读数据到data中
if (bytesRead == -1)
break;
else
{
fout.write(data); //写data数据到本地文件流
bytesTotalRead += bytesRead;
}
}
in.close();
fout.flush();
fout.close();
if (bytesTotalRead != contentLength)
{
throw new IOException("下载文件出错!");
}
}}