如何在java中下载大型文件（大小> 50MB） [英] How to download large sized Files (size > 50MB) in java

问题描述

我正在从远程位置下载文件，下载对于较小尺寸的文件是完整的，对于大尺寸文件（> 10 MB）则是完整的。这是我用来从远程服务器下载文件的代码。

I'm downloading files from a remote location, and the download is complete for smaller sized files and in-complete for large sized files (>10 MB). Here is my code that i have used for downloading files from remote server .

    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());
    }

推荐答案

你可以使用 apache commons IO library 。
这很容易。我在很多项目中都使用过它。

You can use apache commons IO library. It's easy. I have used it in many projects.

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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