java - Bufferedreader 返回 null

Question

我正在尝试从文本中读取网址，然后让应用程序打开该地址，我的缓冲阅读器似乎正在正确读取行，但 readline 始终返回空

String rsslink = null;
    InputStream is = getResources().openRawResource(R.raw.xmlsource);
    BufferedReader br = new BufferedReader(new InputStreamReader(is));

    try {
        while ((rsslink = br.readLine()) != null) 
        {

        }
    } 
    catch (IOException e) 
    {
        e.printStackTrace();
    }
    String RSS_LINK = rsslink;

    Log.d(Constants.TAG, "Service started");
    List<RssItem> rssItems = null;
    try 
    {
        XMLRssParser parser = new XMLRssParser();
        rssItems = parser.parse(getInputStream(RSS_LINK));

Answer 1

您将得到最后一行 null rsslink。您需要更改循环

try {
        while ((rsslink = br.readLine()) != null) 
        {

        }
    } 

至

 try {
        StringBuilder sb=  new StringBuilder();
        while ((rsslink = br.readLine()) != null) 
        {
               sb.append(rsslink);
        }
        rsslink = sb.toString();
    }