java - 如何打开网络上的 txt 文件并将其内容读取为字符串？

Question

我四处寻找如何做到这一点，并且不断寻找不同的解决方案，但没有一个对我来说效果很好，我不明白为什么。 FileReader 只适用于本地文件吗？我尝试了在网站上找到的脚本组合，但它仍然不太有效，它只是抛出一个异常，并给我留下了变量内容的错误。这是我一直未成功使用的代码:

public String downloadfile(String link){
    String content = "";
try {
                URL url = new URL(link);
                URLConnection conexion = url.openConnection();
                conexion.connect();
                InputStream is = url.openStream();
                BufferedReader br = new BufferedReader( new InputStreamReader(is));
                StringBuilder sb = new StringBuilder();
                String line;
                while ((line = br.readLine()) != null) {
                   sb.append(line);
                } 
                content = sb.toString();
                br.close();
                is.close();
            } catch (Exception e) {
                content = "ERROR";
                Log.e("ERROR DOWNLOADING",
                        "File not Found" + e.getMessage());
            }
return content;
}

Answer 1

使用它作为下载器(提供保存文件的路径(以及扩展名)和文本文件的确切链接)

    public static void downloader(String fileName, String url) throws IOException {
    File file = new File(fileName);

    url = url.replace(" ", "%20");
    URL website = new URL(url);
    if (file.exists()) {
        file.delete();
    }
    if (!file.exists()) {
        ReadableByteChannel rbc = Channels.newChannel(website.openStream());
        FileOutputStream fos = new FileOutputStream(fileName);
        fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
        fos.close();

    }
}

然后调用该函数读取文本文件

   public static String[] read(String fileName) {
    String result[] = null;
    Vector v = new Vector(10, 2);
    BufferedReader br = null;
    try {
        br = new BufferedReader(new FileReader(fileName));
        String tmp = "";
        while ((tmp = br.readLine()) != null) {
            v.add(tmp);
        }
        Iterator i = v.iterator();
        result = new String[v.toArray().length];
        int count = 0;
        while (i.hasNext()) {
            result[count++] = i.next().toString();
        }

    } catch (IOException ioe) {
        ioe.printStackTrace();
    }


    return (result);
}

最后是main方法

        public static void main(){
        downloader("D:\\file.txt","http://www.abcd.com/textFile.txt");
        String data[]=read("D:\\file.txt");
         }