Http connection error

            
When performing the following error, e.getmessage () = null:
Log.i ("HttpGet", "Get input stream"); ​​
InputStreamReader in = new InputStreamReader (conn.getInputStream ());
Post method is: conn.connect (); error, exception information is the same. In the simulator using the browser to open the URL is normal.

 
package com.example.httptest; 

import java.io.BufferedReader; 
import java.io.DataOutputStream; 
import java.io.FileNotFoundException; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.net.HttpURLConnection; 
import java.net.SocketException; 
import java.net.SocketTimeoutException; 
import java.net.URI; 
import java.net.URL; 

import org.apache.http.HttpHost; 
import org.apache.http.HttpRequest; 
import org.apache.http.HttpResponse; 
import org.apache.http.HttpStatus; 
import org.apache.http.client.ClientProtocolException; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.ResponseHandler; 
import org.apache.http.client.methods.HttpGet; 
import org.apache.http.client.methods.HttpUriRequest; 
import org.apache.http.conn.ClientConnectionManager; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.apache.http.params.HttpParams; 
import org.apache.http.protocol.HttpContext; 
import org.apache.http.util.EntityUtils; 

import android.net *;. 
import android.util.Log; 

public class MyNetwork {
/ / HTTP Get Method 
public static String HttpGet (String strServerName, String strURI, int port) 
{
String strResult = ""; 
int iPort = port; 

/ / Merge URL string 
String strURL = String.format ("http://% 1 $ s:% 2 $ d% 3 $ s", strServerName, iPort, strURI); 
Log.i ("HttpGet", "URL:" + strURL); 

URL url = null; 
try 
{
url = new URL (strURL); 
/ / Create the HTTP connection 
Log.i ("HttpGet", "Connection to Server ..."); 
HttpURLConnection conn = (HttpURLConnection) url.openConnection (); 
Log.i ("HttpGet", "Connected"); 
/ / Get input stream string 
Log.i ("HttpGet", "Get input stream"); ​​
InputStreamReader in = new InputStreamReader (conn.getInputStream ()); 
/ / Convert buffstream 
Log.i ("HttpGet", "Convert to BufferedReader"); 
BufferedReader bufferread = new BufferedReader (in); 
/ / The received data into strings 
String strtemp = null; 
Log.i ("HttpGet", "Bufferread readline"); 
while ((strtemp = bufferread.readLine ())! = null) 
{
strResult + = strtemp; 
} 
Log.i ("HttpGet", strResult); 
Log.i ("HttpGet", "input stream close"); 
/ / Close the string stream 
in.close (); 
/ / Close the connection 
Log.i ("HttpGet", "Disconnect"); 
conn.disconnect (); 
} 
catch (SocketException e) 
{
Log.i ("HttpGet", "SocketException:" + e.getMessage ()); 
strResult = String.format ("Error:% 1 $ s", e.getMessage ()); 
} 
catch (SocketTimeoutException e) 
{
Log.i ("HttpGet", "SocketTimeoutException:" + e.getMessage ()); 
strResult = String.format ("Error:% 1 $ s", e.getMessage ()); 
} 
catch (FileNotFoundException e) 
{
Log.i ("HttpGet", "FileNotFoundException:" + e.getMessage ()); 
strResult = String.format ("Error:% 1 $ s", e.getMessage ()); 
} 
catch (IOException e) 
{
Log.i ("HttpGet", "IOException:" + e.getMessage ()); 
strResult = String.format ("Error:% 1 $ s", e.getMessage ()); 
} 
catch (Exception e) 
{
e.printStackTrace (); 
Log.i ("HttpGet", "Error:" + e.getMessage ()); 
strResult = String.format ("Error:% 1 $ s", e.getMessage ()); 
} 

return strResult; 
} 

/ / HTTP Post Method 
public static String HttpPost (String strServerName, String strURI, String strParams, int port) 
{
String strResult = ""; 
int iPort = port; 

/ / Merge URL string 
String strURL = String.format ("http://% 1 $ s:% 2 $ d% 3 $ s", strServerName, iPort, strURI); 
Log.i ("HttpPost", "URL:" + strURL); 

URL url = null; 
try 
{
url = new URL (strURL); 
/ / Create the HTTP connection 
Log.i ("HttpPost", "Connection to Server ..."); 
HttpURLConnection conn = (HttpURLConnection) url.openConnection (); 
conn.setDoInput (true) ;/ / Set the input stream using the byte stream 
conn.setDoOutput (true) ;/ / set the output stream using the byte stream 
conn.setRequestMethod ("POST"); 
conn.setUseCaches (false) ;/ / do not use cache 
conn.setRequestProperty ("Content-Type", "application / x-www-form-urlencoded") ;/ / set the parameters 
conn.setRequestProperty ("Charset", "utf-8"); 
conn.connect () ;/ / connection 
Log.i ("HttpPost", "Connected"); 
/ / Send parameters 
Log.i ("HttpPost", "send params"); 
DataOutputStream dop = new DataOutputStream (conn.getOutputStream ()); 
dop.writeBytes (strParams); 
dop.flush () ;/ / send, empty the cache 
dop.close () ;/ / close 
/ / Get input stream string 
Log.i ("HttpPost", "Get input stream"); ​​
InputStreamReader in = new InputStreamReader (conn.getInputStream ()); 
/ / Convert buffstream 
Log.i ("HttpPost", "Convert to BufferedReader"); 
BufferedReader bufferread = new BufferedReader (in); 
/ / The received data into strings 
String strtemp = null; 
Log.i ("HttpPost", "Bufferread readline"); 
while ((strtemp = bufferread.readLine ())! = null) 
{
strResult + = strtemp; 
} 
Log.i ("HttpPost", strResult); 
Log.i ("HttpPost", "input stream close"); 
/ / Close the string stream 
in.close (); 
/ / Close the connection 
Log.i ("HttpPost", "Disconnect"); 
conn.disconnect (); 
} 
catch (SocketTimeoutException e) 
{
Log.i ("HttpPost", "SocketTimeoutException:" + e.getMessage ()); 
strResult = String.format ("Error:% 1 $ s", e.getMessage ()); 
} 
catch (FileNotFoundException e) 
{
Log.i ("HttpPost", "FileNotFoundException:" + e.getMessage ()); 
strResult = String.format ("Error:% 1 $ s", e.getMessage ()); 
} 
catch (IOException e) 
{
Log.i ("HttpPost", "IOException:" + e.getMessage ()); 
strResult = String.format ("Error:% 1 $ s", e.getMessage ()); 
} 
catch (Exception e) 
{
e.printStackTrace (); 
Log.i ("HttpPost", "Error:" + e.getMessage ()); 
strResult = String.format ("Error:% 1 $ s", e.getMessage ()); 
} 

return strResult; 
} 
} 

Reply:
url print is correct? It is easy to know the best posted abnormal problem.
Reply:
Exception information:

 
 12-15 21:51:24.181: I / HttpGet (1412): URL: http://20.40.1.40:80/upload/uploadservice.asmx/ESOP_GetProcAndStation 12-15 21:51:24.212: I / HttpGet (1412): Connection to Server ... 
12-15 21:51:24.212: I / HttpGet (1412): Connected 
12-15 21:51:24.226: I / HttpGet (1412): Get input stream  
12-15 21:51:24.272: W / System.err (1412): android.os.NetworkOnMainThreadException 
12-15 21:51:24.311: W / System.err (1412): at android.os.StrictMode $ AndroidBlockGuardPolicy.onNetwork (StrictMode.java: 1133) 
12-15 21:51:24.352: W / System.err (1412): at libcore.io.BlockGuardOs.connect (BlockGuardOs.java: 84) 
12-15 21:51:24.352: W / System.err (1412): at libcore.io.IoBridge.connectErrno (IoBridge.java: 127) 
12-15 21:51:24.352: W / System.err (1412): at libcore.io.IoBridge.connect (IoBridge.java: 112) 
12-15 21:51:24.352: W / System.err (1412): at java.net.PlainSocketImpl.connect (PlainSocketImpl.java: 192) 
12-15 21:51:24.352: W / System.err (1412): at java.net.PlainSocketImpl.connect (PlainSocketImpl.java: 459) 
12-15 21:51:24.352: W / System.err (1412): at java.net.Socket.connect (Socket.java: 842) 
12-15 21:51:24.352: W / System.err (1412): at libcore.net.http.HttpConnection  (HttpConnection.java: 76). 
12-15 21:51:24.352: W / System.err (1412): at libcore.net.http.HttpConnection . (HttpConnection.java: 50) 
12-15 21:51:24.352: W / System.err (1412): at libcore.net.http.HttpConnection $ Address.connect (HttpConnection.java: 340) 
12-15 21:51:24.352: W / System.err (1412): at libcore.net.http.HttpConnectionPool.get (HttpConnectionPool.java: 87) 
12-15 21:51:24.361: W / System.err (1412): at libcore.net.http.HttpConnection.connect (HttpConnection.java: 128) 
12-15 21:51:24.361: W / System.err (1412): at libcore.net.http.HttpEngine.openSocketConnection (HttpEngine.java: 316) 
12-15 21:51:24.361: W / System.err (1412): at libcore.net.http.HttpEngine.connect (HttpEngine.java: 311) 
12-15 21:51:24.361: W / System.err (1412): at libcore.net.http.HttpEngine.sendSocketRequest (HttpEngine.java: 290) 
12-15 21:51:24.361: W / System.err (1412): at libcore.net.http.HttpEngine.sendRequest (HttpEngine.java: 240) 
12-15 21:51:24.434: W / System.err (1412): at libcore.net.http.HttpURLConnectionImpl.getResponse (HttpURLConnectionImpl.java: 282) 
12-15 21:51:24.434: W / System.err (1412): at libcore.net.http.HttpURLConnectionImpl.getInputStream (HttpURLConnectionImpl.java: 177) 
12-15 21:51:24.441: W / System.err (1412): at com.example.httptest.MyNetwork.HttpGet (MyNetwork.java: 57) 
12-15 21:51:24.441: W / System.err (1412): at com.example.httptest.MainActivity.onCreate (MainActivity.java: 18) 
12-15 21:51:24.461: W / System.err (1412): at android.app.Activity.performCreate (Activity.java: 5133) 
12-15 21:51:24.461: W / System.err (1412): at android.app.Instrumentation.callActivityOnCreate (Instrumentation.java: 1087) 
12-15 21:51:24.461: W / System.err (1412): at android.app.ActivityThread.performLaunchActivity (ActivityThread.java: 2175) 
12-15 21:51:24.461: W / System.err (1412): at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java: 2261) 
12-15 21:51:24.461: W / System.err (1412): at android.app.ActivityThread.access $ 600 (ActivityThread.java: 141) 
12-15 21:51:24.461: W / System.err (1412): at android.app.ActivityThread $ H.handleMessage (ActivityThread.java: 1256) 
12-15 21:51:24.471: W / System.err (1412): at android.os.Handler.dispatchMessage (Handler.java: 99) 
12-15 21:51:24.481: W / System.err (1412): at android.os.Looper.loop (Looper.java: 137) 
12-15 21:51:24.481: W / System.err (1412): at android.app.ActivityThread.main (ActivityThread.java: 5103) 
12-15 21:51:24.481: W / System.err (1412): at java.lang.reflect.Method.invokeNative (Native Method) 
12-15 21:51:24.481: W / System.err (1412): at java.lang.reflect.Method.invoke (Method.java: 525) 
12-15 21:51:24.511: W / System.err (1412): at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run (ZygoteInit.java: 737) 
12-15 21:51:24.511: W / System.err (1412): at com.android.internal.os.ZygoteInit.main (ZygoteInit.java: 553) 
12-15 21:51:24.511: W / System.err (1412): at dalvik.system.NativeStart.main (Native Method) 
 12-15 21:51:24.511: I / HttpGet (1412): Error: null  
12-15 21:51:24.831: D / gralloc_goldfish (1412):. Emulator without GPU emulation detected 
12-15 21:51:24.943: I / ActivityManager (288): Displayed com.example.httptest / .MainActivity: +2 s373ms 
12-15 21:55:00.062: I / ActivityManager (288): No longer want com.android.browser (pid 1245): empty for 1804s 
12-15 21:55:00.072: I / ActivityManager (288): No longer want com.android.calendar (pid 1229): empty for 1804s 
12-15 21:55:00.102: I / ActivityManager (288): No longer want com.android.sharedstoragebackup (pid 1265): empty for 1803s 
12-15 22:00:06.922: D / dalvikvm (288): GC_FOR_ALLOC freed 582K, 45% free 5273K/9520K, paused 117ms, total 133ms 

Reply:
This should be placed in the sub-thread call, you put http connection on the main thread of course wrong
Reply:
Create a thread, you can normally call. . . .
Click the button you want the main thread calls this function to how to do it: Click the button, the first networked access to the data and then parse the data, the data is bound to two Spinner? Or threads inside out and then finished with a message bound?
Reply:

references, 4th Floor yuchongjike reply:

a new thread, you can normally call. . . .
Click the button you want the main thread calls this function to how to do it: Click the button, the first networked access to the data and then parse the data, the data is bound to two Spinner? Or threads inside out and then finished with a message bound?

Data obtained from the network first saved to a bean inside, and then through a message handler to the main thread, and then take the data from the main thread bean inside