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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