2
回答
在网络环境中下载读取一个文件urlConnection.getInputStream报错!
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我是想在网络环境中下载读取一个文件,但不知道为什么报错,我具体是这样做的:

HttpDownloader httpDownloader = new HttpDownloader(); // 后面有贴出该类使用到的方法
   

String contents = httpDownloader.downloadBaseFile("http://192.168.1.104:8081/CFM_xfire/I_Remember.lrc");
   

System.out.println(contents);

其中这个是我的ip地址:192.168.1.104 ,我在tomcat中部署了CFM_xfire项目,然后项目下面有I_Remember.lrc文件,想通过程序把文件中的内容读取出来!

上面代码的 httpDownloader.downloadBaseFile方法如下:

public String downloadBaseFile(String urlStr){
  StringBuffer sb = new StringBuffer();
  String line = null;
  BufferedReader reader = null;
  try{
   //创建一个url对象
   url = new URL(urlStr);
   //通過url对象,创建一个HttpURLConnection对象(连接)
   HttpURLConnection urlConnection = (HttpURLConnection)url.openConnection();
   //通过HttpURLConnection对象,得到InputStream
   reader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
   //使用io流读取文件
   while ((line = reader.readLine()) != null){
    sb.append(line);
   }
  }catch(Exception e){
   e.printStackTrace();
  }finally{
   try{
    if (reader != null){
     reader.close();
    }
   } catch (Exception e){
    e.printStackTrace();
   }
  }
  return sb.toString();
 }

但是提示是在 urlConnection.getInputStream()的时候报错,信息如下:

在本地我访问地址:http://192.168.1.104:8081/CFM_xfire/I_Remember.lrc 的时候是可以看到浏览器上显示信息的,大家看有没有遇到过这个问题!有的话还望赐教!

03-09 10:34:01.500: D/gralloc_goldfish(956): Emulator without GPU emulation detected.

03-09 10:35:53.625: W/System.err(956): android.os.NetworkOnMainThreadException

03-09 10:35:53.652: W/System.err(956):  at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1084)

03-09 10:35:53.661: W/System.err(956):  at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:74)
03-09 10:35:53.670: W/System.err(956):  at libcore.io.IoBridge.connectErrno(IoBridge.java:127)

03-09 10:35:53.670: W/System.err(956):  at libcore.io.IoBridge.connect(IoBridge.java:112)

03-09 10:35:53.670: W/System.err(956):  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)

03-09 10:35:53.670: W/System.err(956):  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)

03-09 10:35:53.690: W/System.err(956):  at java.net.Socket.connect(Socket.java:842)

03-09 10:35:53.690: W/System.err(956):  at libcore.net.http.HttpConnection.<init>(HttpConnection.java:77)

03-09 10:35:53.710: W/System.err(956):  at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)

03-09 10:35:53.810: W/System.err(956):  at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:351)

03-09 10:35:53.820: W/System.err(956):  at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:86)

03-09 10:35:53.820: W/System.err(956):  at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)

03-09 10:35:53.820: W/System.err(956):  at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:308)

03-09 10:35:53.820: W/System.err(956):  at libcore.net.http.HttpEngine.connect(HttpEngine.java:303)

03-09 10:35:53.845: W/System.err(956):  at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:282)

03-09 10:35:53.852: W/System.err(956):  at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:232)

03-09 10:35:53.852: W/System.err(956):  at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:273)

03-09 10:35:53.860: W/System.err(956):  at libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:168)

03-09 10:35:53.870: W/System.err(956):  at com.senly.utils.HttpDownloader.downloadBaseFile(HttpDownloader.java:37)

03-09 10:35:53.910: W/System.err(956):  at com.senly.download.DownloadActivity$DownloadLRCListener.onClick(DownloadActivity.java:40)

03-09 10:35:53.910: W/System.err(956):  at android.view.View.performClick(View.java:3480)

03-09 10:35:53.921: W/System.err(956):  at android.view.View$PerformClick.run(View.java:13983)

03-09 10:35:53.921: W/System.err(956):  at android.os.Handler.handleCallback(Handler.java:605)

03-09 10:35:53.930: W/System.err(956):  at android.os.Handler.dispatchMessage(Handler.java:92)

03-09 10:35:53.930: W/System.err(956):  at android.os.Looper.loop(Looper.java:137)

03-09 10:35:53.950: W/System.err(956):  at android.app.ActivityThread.main(ActivityThread.java:4340)

03-09 10:35:53.950: W/System.err(956):  at java.lang.reflect.Method.invokeNative(Native Method)
03-09 10:35:53.960: W/System.err(956):  at java.lang.reflect.Method.invoke(Method.java:511)
03-09 10:35:53.960: W/System.err(956):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)

03-09 10:35:53.980: W/System.err(956):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)

03-09 10:35:53.980: W/System.err(956):  at dalvik.system.NativeStart.main(Native Method)

 

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潘深练GS
发帖于5年前 2回/6K+阅
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