如何在Java中下载大文件(大小> 50MB)

我正在从远程位置下载文件,对于较小的文件,下载已完成;对于较大的文件(> 10 MB),下载未完成。这是我用于从远程服务器下载文件的代码。

    File dstFile = null;

// check the directory for existence.

String dstFolder = LOCAL_FILE.substring(0,LOCAL_FILE.lastIndexOf(File.separator));

if(!(dstFolder.endsWith(File.separator) || dstFolder.endsWith("/")))

dstFolder += File.separator;

// Creates the destination folder if doesn't not exists

dstFile = new File(dstFolder);

if (!dstFile.exists()) {

dstFile.mkdirs();

}

try {

URL url = new URL(URL_LOCATION);

HttpURLConnection connection = (HttpURLConnection) url.openConnection();

connection.addRequestProperty("User-Agent", "Mozilla/4.76");

//URLConnection connection = url.openConnection();

BufferedInputStream stream = new BufferedInputStream(connection.getInputStream());

int available = stream.available();

byte b[]= new byte[available];

stream.read(b);

File file = new File(LOCAL_FILE);

OutputStream out = new FileOutputStream(file);

out.write(b);

} catch (Exception e) {

System.err.println(e);

VeBLogger.getInstance().log( e.getMessage());

}

回答:

您可以使用apache commons IO库。这很容易。我已经在许多项目中使用过它。

File dstFile = null;

// check the directory for existence.

String dstFolder = LOCAL_FILE.substring(0,LOCAL_FILE.lastIndexOf(File.separator));

if(!(dstFolder.endsWith(File.separator) || dstFolder.endsWith("/")))

dstFolder += File.separator;

// Creates the destination folder if doesn't not exists

dstFile = new File(dstFolder);

if (!dstFile.exists()) {

dstFile.mkdirs();

}

try {

URL url = new URL(URL_LOCATION);

FileUtils.copyURLToFile(url, dstFile);

} catch (Exception e) {

System.err.println(e);

VeBLogger.getInstance().log( e.getMessage());

}

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