Question

我有一个链接列表指向服务器存储库位置，链接代表一些资源，包括图像，xml，txt，csv（每个不同大小）文件，但我面临的问题是当我下载所有下载的文件文件大小相同。

List<String> Links;//list of links dynamically populated 
for(String link:Links)
{
    int i=link.lastIndexOf("/");
    String temp=link.substring(0, i);
    String contentname = temp.substring(temp.lastIndexOf("/")+1);
    String filePath = tempFolderPath + "\\" + contentname;
    URL url = new URL(link);
    URLConnection connection = url.openConnection();
    InputStream is = new DataInputStream(connection.getInputStream()); 
    FileOutputStream fos = null;
    try {
        fos = new FileOutputStream(new File(filePath)); 
        int inByte;
        while((inByte = is.read()) != -1) 
            fos.write(inByte);
        is.close();
        fos.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
    finally
    {
        try {
            is.close();
            fos.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

其中链接可直接访问资源“//localhost:8090/documents/11234/13935/abc.txt”

Answer 1

使用BufferedInputStream而不是专门用于java对象流的DataInputStream。

InputStream is = connection.getInputStream(); 
FileOutputStream fos = null;
try {
    Files.copy(is, new File(filePath)); 
} catch (Exception e) {
    e.printStackTrace();
}

由于问题仍然存在：

为了下载HTML，我做了一件额外的事情：我假装是一个浏览器。

    PrintWriter out = null;
    try {
        out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(urlConnection.getOutputStream(),
                StandardCharsets.ISO_8859_1)), true);
        // We use the standard for our own headers: Latin-1 and "\r\n".

        // Set our own headers, gotten from Firefox TamperData plugin.
        out.print("GET " + pageURL.getPath() + " HTTP/1.1\r\n");
        out.print("Host: " + pageURL.getHost() + "\r\n");
        out.print("User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:26.0) Gecko/20100101 Firefox/26.0\r\n");
        out.print("Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n");
        out.print("Accept-Language: eo,de-de;q=0.8,de;q=0.6,en-us;q=0.4,en;q=0.2\r\n");
        out.print("\r\n");
        out.flush();

最重要的是检查生成的文件。

从URL java下载资源

1 个答案: