Java下载目录中的所有文件和文件夹 [英] Java download all files and folders in a directory

问题描述

我正在尝试从该目录下载所有文件。但是，我只能将其下载为一个文件。我能做什么？我尝试搜索此问题，结果令人困惑，人们开始建议改用httpclients。感谢您的帮助，到目前为止，这是我的代码。已经建议我使用输入流来获取目录中的所有文件。那会进入数组吗？我在这里尝试了该教程 http://docs.oracle.com/javase/tutorial/networking / urls / ，但这并没有帮助我理解。

I am trying to download all the files from this directory. However, I can only get it to download the url as one file. What can I do? I tried searching for this problem and it was confusing and people were starting to suggest using httpclients instead. Thanks for your help, this is my code so far. It has been suggested that I use an input stream to attain all the files in the directory. Would that then go into an array? I tried the tutorial here http://docs.oracle.com/javase/tutorial/networking/urls/ but it didn't help me understand.

//ProgressBar/Install
            String URL_LOCATION = "http://www.futureretrogaming.tk/gamefiles/ProfessorPhys/";
            String LOCAL_FILE = filelocation.getText() + "\\ProfessorPhys\\";
            try {
                java.net.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);
            }

我还找到了此代码，该代码将返回要下载的文件列表。有人可以帮我组合这两个代码吗？

I also found this code which will return a List of files to download. Can someone help me combine the two codes?

public class GetAllFilesInDirectory {

public static void main(String[] args) throws IOException {

    File dir = new File("dir");

    System.out.println("Getting all files in " + dir.getCanonicalPath() + " including those in subdirectories");
    List<File> files = (List<File>) FileUtils.listFiles(dir, TrueFileFilter.INSTANCE, TrueFileFilter.INSTANCE);
    for (File file : files) {
        System.out.println("file: " + file.getCanonicalPath());
    }

}

}

推荐答案

您需要下载页面，即目录列表，对其进行解析，然后下载该页面中链接的单个文件...

You need to download the page, which is the directory listing, parse it and then download the inidiviudal files linked in the page...

您可以执行以下操作...

You could do something like...

URL url = new URL("http:www.futureretrogaming.tk/gamefiles/ProfessorPhys");
InputStream is = null;
try {
    is = url.openStream();
    byte[] buffer = new byte[1024];
    int bytesRead = -1;
    StringBuilder page = new StringBuilder(1024);
    while ((bytesRead = is.read(buffer)) != -1) {
        page.append(new String(buffer, 0, bytesRead));
    }
    // Spend the rest of your life using String methods
    // to parse the result...
} catch (IOException ex) {
    ex.printStackTrace();
} finally {
    try {
        is.close();
    } catch (Exception e) {
    }
}

或者，您可以下载 Jsoup 并使用它来完成所有艰苦的工作...

Or, you can download Jsoup and use it to do all the hard work...

try {
    Document doc = Jsoup.connect("http:www.futureretrogaming.tk/gamefiles/ProfessorPhys").get();
    Elements links = doc.getElementsByTag("a");
    for (Element link : links) {
        System.out.println(link.attr("href") + " - " + link.text());
    }
} catch (IOException ex) {
    ex.printStackTrace();
}

输出的内容...

?C=N;O=D - Name
?C=M;O=A - Last modified
?C=S;O=A - Size
?C=D;O=A - Description
/gamefiles/ - Parent Directory
Assembly-CSharp-Editor-firstpass-vs.csproj - Assembly-CSharp-Edit..>
Assembly-CSharp-Editor-firstpass.csproj - Assembly-CSharp-Edit..>
Assembly-CSharp-Editor-firstpass.pidb - Assembly-CSharp-Edit..>
Assembly-CSharp-firstpass-vs.csproj - Assembly-CSharp-firs..>
Assembly-CSharp-firstpass.csproj - Assembly-CSharp-firs..>
Assembly-CSharp-firstpass.pidb - Assembly-CSharp-firs..>
Assembly-CSharp-vs.csproj - Assembly-CSharp-vs.c..>
Assembly-CSharp.csproj - Assembly-CSharp.csproj
Assembly-CSharp.pidb - Assembly-CSharp.pidb
Assembly-UnityScript-Editor-firstpass-vs.unityproj - Assembly-UnityScript..>
Assembly-UnityScript-Editor-firstpass.pidb - Assembly-UnityScript..>
Assembly-UnityScript-Editor-firstpass.unityproj - Assembly-UnityScript..>
Assembly-UnityScript-firstpass-vs.unityproj - Assembly-UnityScript..>
Assembly-UnityScript-firstpass.pidb - Assembly-UnityScript..>
Assembly-UnityScript-firstpass.unityproj - Assembly-UnityScript..>
Assembly-UnityScript-vs.unityproj - Assembly-UnityScript..>
Assembly-UnityScript.pidb - Assembly-UnityScript..>
Assembly-UnityScript.unityproj - Assembly-UnityScript..>
Assets/ - Assets/
Library/ - Library/
Professor%20Phys-csharp.sln - Professor Phys-cshar..>
Professor%20Phys.exe - Professor Phys.exe
Professor%20Phys.sln - Professor Phys.sln
Professor%20Phys.userprefs - Professor Phys.userp..>
Professor%20Phys_Data/ - Professor Phys_Data/
Script.doc - Script.doc
~$Script.doc - ~$Script.doc
~WRL0392.tmp - ~WRL0392.tmp
~WRL1966.tmp - ~WRL1966.tmp

然后您需要构建一个每个文件的新URL并按您的原样阅读...

You would then need to build a new URL for each file and read as you have already done...

例如， href 表示 Assembly-CSharp-Edit ..> 是 Assembly-CSharp-Editor-firstpass-vs.csproj ，相对链接，因此您需要在此前缀前加上 http://www.futureretrogaming.tk/gamefiles/ProfessorPhys 来创建新的 URL 的 http://www.futureretrogaming.tk/gamefiles/ProfessorPhys/Assembly-CSharp-Editor-firstpass-vs.csproj

For example, the href for Assembly-CSharp-Edit..> is Assembly-CSharp-Editor-firstpass-vs.csproj, which appears to a relative link, so you would need prefix this with http://www.futureretrogaming.tk/gamefiles/ProfessorPhys to make a new URL of http://www.futureretrogaming.tk/gamefiles/ProfessorPhys/Assembly-CSharp-Editor-firstpass-vs.csproj

您需要为要抓取的每个元素执行此操作

You would need to do this for each element you want to grab

这篇关于Java下载目录中的所有文件和文件夹的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！