HTTPUrlConnection 出现 FileNotFoundException 的问题

URL url = new URL(strUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.getInputStream()

HTTPUrlConnection 在 getInputStream出现 FileNotFoundException 的问题，可能有两种情况：

1. URL中带有中文可能导致这个问题。具体分析待补充。使用 URLEncoder.encode(..)解决。

参看这里 http://blog.youkuaiyun.com/berber78/article/details/7245872

2. URL确定OK的话，还是出现FileNotFoundException ，可以看看是否是如下情况：

a FileNotFoundException also comes when you get an error message from the server and then try to access getInputStream(). If the Response code is a 400 or above, any call to getInputStream() will throw this error. In this case, you should check getErrorStream() instead. See my answer here.

if ( conn.getResponseCode() >= 400) {
    conn.getErrorStream();
} else {
    conn.getInputStream();
}

参看这里：

http://stackoverflow.com/questions/9472425/filenotfoundexception-on-android-version-2-3/18151461#18151461