Question

我使用这些代码从服务器下载mp3文件：

URL u = new URL(link);
HttpURLConnection c = (HttpURLConnection) u.openConnection();
c.setRequestMethod("GET");
c.setDoOutput(true);
c.connect();
FileOutputStream f = new FileOutputStream(new File(root,"Video.mp4"));


InputStream in = c.getInputStream();

byte[] buffer = new byte[1024];
int len1 = 0;
while ( (len1 = in.read(buffer)) > 0 ) {
     f.write(buffer,0,len1);
}
f.close();

通过移动数据（3G）可以正常工作，但当我尝试通过wifi下载时，LogCat显示：

06-08 22:36:49.892: W/System.err(347): java.net.UnknownHostException: Host is unresolved: dl2.mp3.zdn.vn:80
06-08 22:36:49.902: W/System.err(347):     at java.net.Socket.connect(Socket.java:1038)
06-08 22:36:49.902: W/System.err(347):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:62)
06-08 22:36:49.902: W/System.err(347):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnectionPool.get(HttpConnectionPool.java:88)
06-08 22:36:49.902: W/System.err(347):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getHTTPConnection(HttpURLConnectionImpl.java:927)
06-08 22:36:49.902: W/System.err(347):     at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:909)
06-08 22:36:49.902: W/System.err(347):     at binh.book.Book$1.run(Book.java:60)
06-08 22:36:49.902: W/System.err(347):     at java.lang.Thread.run(Thread.java:1096)  
06-07 21:34:59.306: W/System.err(9686):     at binh.pronunciation.DownloadFiles$1$1.run(DownloadFiles.java:62)

在此代码中：

c.connect();

任何帮助？谢谢！

Answer 1

java.net.UnknownHostException: Host is unresolved:

当您连接到有效的wifi但路由器未接收互联网时，也会引发此异常。很容易重现这个： 1）连接到有效的wifi 2）现在在插入路由器时从路由器上拔下电缆

你会发现这个错误!!

通过wifi下载Android错误但数据上确定（3G）

1 个答案: