java 为什么我收到 HttpHostConnectException
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Why I am getting the HttpHostConnectException
提问by Muhammad Salman Farooq
I am using the following code in android virtual Machine
我在android虚拟机中使用以下代码
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://10.0.2.2/ReadingFromServer.php");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
}catch(Exception e){
Log.e("log_tag", "Error in http connection"+e.toString());
}
I am getting the HttpHostConnectException. Dont know why? I have changed the address in the url from 127.0.0.1 to 10.0.2.2 but still getting that exception. I have wamp server installed in my computer and the file "ReadingFromServer.php" is placed in "www" folder.
我收到了 HttpHostConnectException。不知道为什么？我已将 url 中的地址从 127.0.0.1 更改为 10.0.2.2，但仍然收到该异常。我的电脑上安装了 wamp 服务器，文件“ReadingFromServer.php”放在“www”文件夹中。
Here is the complete stack trace
这是完整的堆栈跟踪
05-20 20:40:32.218: W/System.err(681): org.apache.http.conn.HttpHostConnectException: Connection to http://10.0.2.2 refused
05-20 20:40:32.248: W/System.err(681): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:183)
05-20 20:40:32.258: W/System.err(681): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
05-20 20:40:32.268: W/System.err(681): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
05-20 20:40:32.278: W/System.err(681): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
05-20 20:40:32.288: W/System.err(681): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
05-20 20:40:32.298: W/System.err(681): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
05-20 20:40:32.308: W/System.err(681): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
05-20 20:40:32.318: W/System.err(681): at com.test.TestProjectActivity.onCreate(TestProjectActivity.java:56)
05-20 20:40:32.328: W/System.err(681): at android.app.Activity.performCreate(Activity.java:4465)
05-20 20:40:32.338: W/System.err(681): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
05-20 20:40:32.348: W/System.err(681): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
05-20 20:40:32.358: W/System.err(681): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
05-20 20:40:32.368: W/System.err(681): at android.app.ActivityThread.access0(ActivityThread.java:123)
05-20 20:40:32.378: W/System.err(681): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
05-20 20:40:32.388: W/System.err(681): at android.os.Handler.dispatchMessage(Handler.java:99)
05-20 20:40:32.398: W/System.err(681): at android.os.Looper.loop(Looper.java:137)
05-20 20:40:32.408: W/System.err(681): at android.app.ActivityThread.main(ActivityThread.java:4424)
05-20 20:40:32.418: W/System.err(681): at java.lang.reflect.Method.invokeNative(Native Method)
05-20 20:40:32.428: W/System.err(681): at java.lang.reflect.Method.invoke(Method.java:511)
05-20 20:40:32.438: W/System.err(681): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
05-20 20:40:32.448: W/System.err(681): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
05-20 20:40:32.448: W/System.err(681): at dalvik.system.NativeStart.main(Native Method)
05-20 20:40:32.468: W/System.err(681): Caused by: java.net.ConnectException: socket failed: EACCES (Permission denied)
05-20 20:40:32.488: W/System.err(681): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:181)
05-20 20:40:32.498: W/System.err(681): ... 21 more
05-20 20:40:32.508: W/System.err(681): Caused by: java.net.SocketException: socket failed: EACCES (Permission denied)
05-20 20:40:32.528: W/System.err(681): at libcore.io.IoBridge.socket(IoBridge.java:573)
05-20 20:40:32.538: W/System.err(681): at java.net.PlainSocketImpl.create(PlainSocketImpl.java:201)
05-20 20:40:32.548: W/System.err(681): at java.net.Socket.checkOpenAndCreate(Socket.java:663)
05-20 20:40:32.558: W/System.err(681): at java.net.Socket.connect(Socket.java:807)
05-20 20:40:32.578: W/System.err(681): at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
05-20 20:40:32.578: W/System.err(681): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144)
05-20 20:40:32.588: W/System.err(681): ... 21 more
05-20 20:40:32.598: W/System.err(681): Caused by: libcore.io.ErrnoException: socket failed: EACCES (Permission denied)
05-20 20:40:32.628: W/System.err(681): at libcore.io.Posix.socket(Native Method)
05-20 20:40:32.658: W/System.err(681): at libcore.io.BlockGuardOs.socket(BlockGuardOs.java:181)
05-20 20:40:32.658: W/System.err(681): at libcore.io.IoBridge.socket(IoBridge.java:558)
Thanks.
谢谢。
回答by Dirk J?ckel
Did you declare the Internet permission in the AndroidManifest.xml?
您是否在 AndroidManifest.xml 中声明了 Internet 权限？
You need to put the following into the AndroidManifest.xml
您需要将以下内容放入 AndroidManifest.xml
<manifest>
...
<uses-permission android:name="android.permission.INTERNET"/>
</manifest>
回答by Muaz Othman
internet permission to your application by adding this under manifesttag in your AndroidManifest.xml
通过manifest在您的AndroidManifest.xml
<uses-permission android:name="android.permission.INTERNET" />
otherwise Android will block internet traffic from your app
否则 Android 将阻止来自您的应用的互联网流量
