无法发送HTTP请求到后端服务器

Question

我开发一个机器人应用HTTP数据发送到其被保持在虚拟机的后端服务器。

try{ 
    HttpClient client = new DefaultHttpClient(); 
    HttpPost post = new HttpPost("192.168.1.150/application/check.php"); 
    params.add(new BasicNameValuePair("device", Build.SERIAL)); 
    params.add(new BasicNameValuePair("person", "A")); 
    UrlEncodedFormEntity ent = new UrlEncodedFormEntity(params,HTTP.UTF_8); 
    post.setEntity(ent); 
    HttpResponse responsePOST = client.execute(post); 
    HttpEntity resEntity = responsePOST.getEntity(); 
    if (resEntity != null) {  
     Log.i("RESPONSE",EntityUtils.toString(resEntity)); 
    } 
} catch (Exception e) { 
    e.printStackTrace(); 
} 

而下方则是PHP代码：

<?php 
$file = "C:/wamp/www/application/file.txt"; 
$data = "device:".$_POST['device']." person:".$_POST['person']; 
file_put_contents($file, $data); 
?> 

但是，文件不能被创建，因为我看不到输出，所以我无法找出应用程序是否能够成功连接到后端服务器或不。我的移动设备和服务器机器都在同一个wifi网络中，所以通过输入虚拟地址，它应该能够让我的应用连接到服务器，不是吗？

下面是在logcat的错误消息：

07-18 16:36:06.407: W/System.err(24598): android.os.NetworkOnMainThreadException 
07-18 16:36:06.415: W/System.err(24598): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099) 
07-18 16:36:06.415: W/System.err(24598): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84) 
07-18 16:36:06.415: W/System.err(24598): at libcore.io.IoBridge.connectErrno(IoBridge.java:127) 
07-18 16:36:06.415: W/System.err(24598): at libcore.io.IoBridge.connect(IoBridge.java:112) 
07-18 16:36:06.415: W/System.err(24598): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192) 
07-18 16:36:06.415: W/System.err(24598): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459) 
07-18 16:36:06.415: W/System.err(24598): at java.net.Socket.connect(Socket.java:842) 
07-18 16:36:06.415: W/System.err(24598): at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119) 
07-18 16:36:06.415: W/System.err(24598): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144) 
07-18 16:36:06.415: W/System.err(24598): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 
07-18 16:36:06.415: W/System.err(24598): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 
07-18 16:36:06.415: W/System.err(24598): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 
07-18 16:36:06.415: W/System.err(24598): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 
07-18 16:36:06.415: W/System.err(24598): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) 
07-18 16:36:06.423: W/System.err(24598): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) 
07-18 16:36:06.423: W/System.err(24598): at android.reader.Reader$1.onClick(Reader.java:106) 
07-18 16:36:06.423: W/System.err(24598): at android.view.View.performClick(View.java:3511) 
07-18 16:36:06.423: W/System.err(24598): at android.view.View$PerformClick.run(View.java:14105) 
07-18 16:36:06.423: W/System.err(24598): at android.os.Handler.handleCallback(Handler.java:605) 
07-18 16:36:06.423: W/System.err(24598): at android.os.Handler.dispatchMessage(Handler.java:92) 
07-18 16:36:06.423: W/System.err(24598): at android.os.Looper.loop(Looper.java:137) 
07-18 16:36:06.423: W/System.err(24598): at android.app.ActivityThread.main(ActivityThread.java:4424) 
07-18 16:36:06.423: W/System.err(24598): at java.lang.reflect.Method.invokeNative(Native Method) 
07-18 16:36:06.423: W/System.err(24598): at java.lang.reflect.Method.invoke(Method.java:511) 
07-18 16:36:06.423: W/System.err(24598): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
07-18 16:36:06.423: W/System.err(24598): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
07-18 16:36:06.423: W/System.err(24598): at dalvik.system.NativeStart.main(Native Method) 

消息显示logcat中后，我修改程序：

07-18 17:35:05.899: E/WindowManager(28043): Activity android.reader.Reader has leaked window [email protected] that was originally added here 
07-18 17:35:05.899: E/WindowManager(28043): android.view.WindowLeaked: Activity android.reader.Reader has leaked window [email protected] that was originally added here 
07-18 17:35:05.899: E/WindowManager(28043):  at android.view.ViewRootImpl.<init>(ViewRootImpl.java:344) 
07-18 17:35:05.899: E/WindowManager(28043):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:267) 
07-18 17:35:05.899: E/WindowManager(28043):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:215) 
07-18 17:35:05.899: E/WindowManager(28043):  at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:140) 
07-18 17:35:05.899: E/WindowManager(28043):  at android.view.Window$LocalWindowManager.addView(Window.java:537) 
07-18 17:35:05.899: E/WindowManager(28043):  at android.app.Dialog.show(Dialog.java:278) 
07-18 17:35:05.899: E/WindowManager(28043):  at android.reader.Reader$GrabURL.onPreExecute(Reader.java:219) 
07-18 17:35:05.899: E/WindowManager(28043):  at android.reader.Reader$1.onClick(Reader.java:101) 
07-18 17:35:05.899: E/WindowManager(28043):  at android.view.View.performClick(View.java:3511) 
07-18 17:35:05.899: E/WindowManager(28043):  at android.view.View$PerformClick.run(View.java:14105) 
07-18 17:35:05.899: E/WindowManager(28043):  at android.os.Handler.handleCallback(Handler.java:605) 
07-18 17:35:05.899: E/WindowManager(28043):  at android.os.Handler.dispatchMessage(Handler.java:92) 
07-18 17:35:05.899: E/WindowManager(28043):  at android.os.Looper.loop(Looper.java:137) 
07-18 17:35:05.899: E/WindowManager(28043):  at android.app.ActivityThread.main(ActivityThread.java:4424) 
07-18 17:35:05.899: E/WindowManager(28043):  at java.lang.reflect.Method.invokeNative(Native Method) 
07-18 17:35:05.899: E/WindowManager(28043):  at java.lang.reflect.Method.invoke(Method.java:511) 
07-18 17:35:05.899: E/WindowManager(28043):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
07-18 17:35:05.899: E/WindowManager(28043):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
07-18 17:35:05.899: E/WindowManager(28043):  at dalvik.system.NativeStart.main(Native Method) 
07-18 17:35:05.899: D/OpenGLRenderer(28043): Flushing caches (mode 1) 

Answer 1

首先，你HtttpPost请求URL ..

HttpPost post = new HttpPost("192.168.1.150/application/check.php"); 

应该是这样的，

HttpPost post = new HttpPost("http://192.168.1.150/application/check.php"); 

现在，第二，检查应用程序的清单文件的权限

<uses-permission android:name="android.permission.INTERNET"></uses-permission> 

第三个，

放入后台线程您完整的Web请求的代码或的AsyncTask的doInBackGround()没有在应用程序的MainUI线程。

终于之后，从您的Http请求检查响应，你做了什么..

此外，如果可能的调试你的Web请求的代码，所以你可以找到怎么回事错..

解决方案：

从您的logcat的错误，我们得出结论：你想网络相关操作您的活动的MainUI Thread。因此，我建议您在第三步中使用AsyncTask进行此操作。

我的回答的第三步。

把你的全部HttpRequest代码在AsyncYAsk's doInBackGround()。