Android java.net.UnknownHostException:无法解决某些URL的主机异常

我正在尝试从一些URL下载一些图像。问题是，其中一些主机下载正常，但有些给出了错误-

java.net.UnknownHostException:无法解析主机“映像url”：没有与主机名关联的地址。

已授予必要的权限，wifi也正常工作。以下是例外情况：-

02-20 11:34:45.230: W/System.err(9336): java.net.UnknownHostException: Unable to resolve host "image-url": No address associated with hostname.
at java.net.InetAddress.lookupHostByName(InetAddress.java:424)
02-20 11:34:45.230: W/System.err(9336):     at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
02-20 11:34:45.230: W/System.err(9336):     at java.net.InetAddress.getAllByName(InetAddress.java:214)
02-20 11:34:45.240: W/System.err(9336):     at com.android.okhttp.internal.Dns$1.getAllByName(Dns.java:28)
02-20 11:34:45.240: W/System.err(9336):     at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:216)
02-20 11:34:45.240: W/System.err(9336):     at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:122)
02-20 11:34:45.240: W/System.err(9336):     at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:292)
02-20 11:34:45.240: W/System.err(9336):     at com.android.okhttp.internal.http.HttpEngine.sendSocketRequest(HttpEngine.java:255)
02-20 11:34:45.240: W/System.err(9336):     at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:206)
02-20 11:34:45.240: W/System.err(9336):     at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:345)
02-20 11:34:45.240: W/System.err(9336):     at com.android.okhttp.internal.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:89)
02-20 11:34:45.240: W/System.err(9336):     at com.aquimo.downloadengine.ResourceDownloaderAndAllocator.loadFile(ResourceDownloaderAndAllocator.java:103)
02-20 11:34:45.240: W/System.err(9336):     at com.aquimo.downloadengine.ResourceDownloaderAndAllocator.access$0(ResourceDownloaderAndAllocator.java:72)
02-20 11:34:45.250: W/System.err(9336):     at com.aquimo.downloadengine.ResourceDownloaderAndAllocator$1.run(ResourceDownloaderAndAllocator.java:37)
02-20 11:34:45.250: W/System.err(9336):     at java.lang.Thread.run(Thread.java:841)
02-20 11:34:45.250: W/System.err(9336): Caused by: libcore.io.GaiException: getaddrinfo failed: EAI_NODATA (No address associated with hostname)
02-20 11:34:45.250: W/System.err(9336):     at libcore.io.Posix.getaddrinfo(Native Method)
02-20 11:34:45.260: W/System.err(9336):     at libcore.io.ForwardingOs.getaddrinfo(ForwardingOs.java:61)
02-20 11:34:45.260: W/System.err(9336):     at java.net.InetAddress.lookupHostByName(InetAddress.java:405)

代码如下：-

HttpURLConnection ucon = (HttpURLConnection)url.openConnection();
ucon.setDoInput(true);
ucon.connect();
InputStream inputStream = ucon.getInputStream();
FileOutputStream fileOutput = new FileOutputStream(file);
Log.d(TAG, "inputStream size = " + inputStream.available());
int downloadedSize = 0;
byte[] buffer = new byte[1024];
int bufferLength = 0;
while ((bufferLength = inputStream.read(buffer)) > 0)
{
    fileOutput.write(buffer, 0, bufferLength);
    downloadedSize += bufferLength;
    Log.i(TAG, "Progress: " + "downloadedSize:" + downloadedSize);
}
fileOutput.close();

---

这意味着您正在将

“图像url”

作为要加载的url传递。除非您将此映射到有效的IP，否则您将无法获得任何信息。

没有与主机名关联的地址

您要传递的URL是什么？您正在防火墙后面的设备中进行尝试吗？我正在我的nexus4中进行尝试，但它没有任何防火墙或防病毒软件。此外，我可以在我的浏览器中打开此url。似乎是您的dns的一些配置。你是从互联网还是从本地服务器获取图像？

java.net.UnknownHostException: Unable to resolve host "image-url": No address associated with hostname