使用Java优化下载速度
我在java中有一种方法可以从web下载文件,但是通过java代码下载比使用任何浏览器下载都要慢 我的代码如下:使用Java优化下载速度,java,performance,download,fileinputstream,Java,Performance,Download,Fileinputstream,我在java中有一种方法可以从web下载文件,但是通过java代码下载比使用任何浏览器下载都要慢 我的代码如下: public void downloadFile(String downloadURL) { System.out.println("Starting file download ....."); BufferedInputStream in = null; FileOutputStream fout
public void downloadFile(String downloadURL) {
System.out.println("Starting file download .....");
BufferedInputStream in = null;
FileOutputStream fout = null;
try {
URL u = new URL(downloadURL);
HttpURLConnection uc = (HttpURLConnection) u.openConnection();
String fileName = uc.getHeaderField("Content-Disposition");
fileName = YouTubeDownloader.parseResponse(fileName, "filename=\"", "\"");
System.out.println(fileName);
if (uc.getHeaderField("Content-Length") == null) {
System.out.println("File Length zero!!!!");
}
float fileSize = Float.parseFloat(uc.getHeaderField("Content-Length"));
in = new BufferedInputStream(uc.getInputStream());
System.out.println("File size : " + fileSize);
fout = new FileOutputStream("c:\\Dinesh\\" + fileName);
byte data[] = new byte[1024];
int count = 0;
int downloaded = 0;
while ((count = in.read(data, 0, 1024)) != -1) {
downloaded += count;
int downloadPercentage = (int) ((downloaded / fileSize) * 100);
System.out.println(downloadPercentage);
fout.write(data, 0, count);
}
System.out.println("File download completed.....");
} catch (Exception e) {
System.out.println(e);
}
}
下载速度是否因为缓冲区较小而太慢
我是否可以增加缓冲区大小,或者如何优化缓冲区大小以降低下载速度
我需要修改哪些内容
提前感谢。如果您不需要监控进度,请尝试以下操作:
Path saveFile = Paths.get("C:\\Dinesh", fileName);
Files.copy(uc.getInputStream(), saveFile);
除非写入速度较慢的设备,否则性能应受到网络速度/服务器传输速率的限制。缓冲输出流可能会有所帮助,将读取大小增加到8192字节也会有所帮助。