android - HttpHostConnectException : Connection refused Android

Question

我正在尝试通过 HttpPost 连接并将用户名和密码发送到网站，然后从该网站接收字符串。我尝试了过去对我有用的各种方法，但现在当我发送用户名和密码标识符时，应用程序超时长达 4 分钟，然后吐出以下异常:

 07-16 16:32:32.897: W/System.err(632): Unable to connect to the server
    07-16 16:32:32.907: W/System.err(632): org.apache.http.conn.HttpHostConnectException: Connection to http://devdashboard.company refused
    07-16 16:32:32.917: W/System.err(632):  at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:183)
    07-16 16:32:32.917: W/System.err(632):  at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
    07-16 16:32:32.917: W/System.err(632):  at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
    07-16 16:32:32.917: W/System.err(632):  at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
    07-16 16:32:32.917: W/System.err(632):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
    07-16 16:32:32.917: W/System.err(632):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
    07-16 16:32:32.927: W/System.err(632):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
    07-16 16:32:32.927: W/System.err(632):  at company.android.dashboard.app.HttpHelperAndroid.sendToHttp(HttpHelperAndroid.java:66)
    07-16 16:32:32.927: W/System.err(632):  at company.android.dashboard.app.DashboardAppActivity.goToDashboard(DashboardAppActivity.java:62)
    07-16 16:32:32.927: W/System.err(632):  at java.lang.reflect.Method.invokeNative(Native Method)
    07-16 16:32:32.937: W/System.err(632):  at java.lang.reflect.Method.invoke(Method.java:511)
    07-16 16:32:32.937: W/System.err(632):  at android.view.View$1.onClick(View.java:3039)
    07-16 16:32:32.947: W/System.err(632):  at android.view.View.performClick(View.java:3511)
    07-16 16:32:32.947: W/System.err(632):  at android.view.View$PerformClick.run(View.java:14105)
    07-16 16:32:32.947: W/System.err(632):  at android.os.Handler.handleCallback(Handler.java:605)
    07-16 16:32:32.957: W/System.err(632):  at android.os.Handler.dispatchMessage(Handler.java:92)
    07-16 16:32:32.957: W/System.err(632):  at android.os.Looper.loop(Looper.java:137)
    07-16 16:32:32.967: W/System.err(632):  at android.app.ActivityThread.main(ActivityThread.java:4424)
    07-16 16:32:32.977: W/System.err(632):  at java.lang.reflect.Method.invokeNative(Native Method)
    07-16 16:32:32.977: W/System.err(632):  at java.lang.reflect.Method.invoke(Method.java:511)
    07-16 16:32:32.977: W/System.err(632):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
    07-16 16:32:32.987: W/System.err(632):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
    07-16 16:32:32.987: W/System.err(632):  at dalvik.system.NativeStart.main(Native Method)
    07-16 16:32:32.987: W/System.err(632): Caused by: java.net.ConnectException: failed to connect to /50.19.240.232 (port 80): connect failed: ETIMEDOUT (Connection timed out)
    07-16 16:32:32.997: W/System.err(632):  at libcore.io.IoBridge.connect(IoBridge.java:114)
    07-16 16:32:32.997: W/System.err(632):  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
    07-16 16:32:32.997: W/System.err(632):  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
    07-16 16:32:33.007: W/System.err(632):  at java.net.Socket.connect(Socket.java:842)
    07-16 16:32:33.007: W/System.err(632):  at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
    07-16 16:32:33.017: W/System.err(632):  at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144)
    07-16 16:32:33.017: W/System.err(632):  ... 22 more
    07-16 16:32:33.027: W/System.err(632): Caused by: libcore.io.ErrnoException: connect failed: ETIMEDOUT (Connection timed out)
    07-16 16:32:33.047: W/System.err(632):  at libcore.io.Posix.connect(Native Method)
    07-16 16:32:33.047: W/System.err(632):  at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:85)
    07-16 16:32:33.047: W/System.err(632):  at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
    07-16 16:32:33.057: W/System.err(632):  at libcore.io.IoBridge.connect(IoBridge.java:112)
    07-1
    6 16:32:33.057: W/System.err(632):  ... 27 more

我的 XML list 文件中启用了 Internet 权限

我目前的实现是这样的:

  String LOGIN = "email@gmail.com";
        String PASSWORD ="password1";

        //JSONObject to send the username and pw
        JSONObject json = new JSONObject();
        //put the path in the JSONArray object

        JSONArray vect = new JSONArray();
        vect.put("company Android Library");
        vect.put("Rocket Ship");

        int duration = 50;
        try {
            json.put("email", LOGIN);
            json.put("password", PASSWORD);
            json.put("json", "true");


        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        Log.d(TAG, "ABOUT TO SEND:" + json.toString());

        JSONObject inJson = HttpHelperAndroid.sendToHttp(json, "http://devdashboard.company/login");

        if(inJson != null)
        {
            Log.d(TAG, "RECIEVED the JSON:" + inJson.toString());
        }
        else
            Log.d(TAG, "THE RESPONSE WAS NULL");
    }

HttpHelperAndroid 类如下所示:

     public class HttpHelperAndroid
    {
        private static final String TAG = "HttpHelperAndroid";//TAG for the LogCat(debugging)


    private static boolean responseSuccessful = true;

    /**
     * sends the JSONObject parameter to the desired URL parameter and gets the response
     * 
     * @param url the URL to which the JSONObject should be sent
     * @param jsonObjOut the JSONObject that is to be sent
     * @return the response from the server as a JSONObject
     */
    public static JSONObject sendToHttp(JSONObject jsonObjOut, String url) {
        responseSuccessful = true;
        try
        {
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpPost httpRequest = new HttpPost(url);

            //convert the JSONObject to a string
            StringEntity se;

            //set our StringEntity to the JSONObject as a string
            se = new StringEntity(jsonObjOut.toString());

            // Set HTTP params
            httpRequest.setEntity(se);
            httpRequest.setHeader("Accept", "application/json");
            httpRequest.setHeader("Content-type", "application/json");
            httpRequest.setHeader("Accept-Encoding", "gzip"); //for gzip compression

            //get the current time
            long oldTime = System.currentTimeMillis();

            HttpResponse response = null;
            try
            {
                //execute the http request and get the response
                response = (HttpResponse) httpClient.execute(httpRequest);
            }
            catch(HttpHostConnectException e)
            {
                System.err.println("Unable to connect to the server");
                e.printStackTrace();
                responseSuccessful = false;
            }

            //only continue executing if we got a response from the server
            if(responseSuccessful)
            {
                //print how long the response took to the LogCat if it's on

                    Log.i(TAG, "HTTPResponse received in [" + (System.currentTimeMillis()-oldTime) + "ms]");


                // Get hold of the response entity (-> the data):
                HttpEntity entity = response.getEntity();

                if (entity != null) {
                    // Read the content stream
                    InputStream in = entity.getContent();
                    Header contentEncoding = response.getFirstHeader("Content-Encoding");
                    if (contentEncoding != null && contentEncoding.getValue().equalsIgnoreCase("gzip")) {
                        in = new GZIPInputStream(in);
                    }

                    // convert content stream to a String
                    String resultString= streamToString(in);

                    //close the stream
                    in.close();

                    // convert the String into a JSONObject
                    JSONObject jsonObjRecv = new JSONObject(resultString);

                    //take a peak at the JSONObject we got back if the LogCat is on

                        Log.i(TAG,"<JSONObject>\n"+jsonObjRecv.toString()+"\n</JSONObject>");

                    //return the JSONObject we got back from the server
                    return jsonObjRecv;
                } 
            }
        }
        //catch any exception that was thrown
        catch (Exception e)
        {
            //Print the exception
            e.printStackTrace();
        }

        return null;
    }

    private static String streamToString(InputStream is)
    {
        //create a new BufferedReader for the input stream
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));

        //create a new StringBuilder to append the lines
        StringBuilder sb = new StringBuilder();

        //initialize an empty string
        String line = null;

        try
        {
            //iterate as long as there is still lines to be read
            while ((line = reader.readLine()) != null) 
            {
                //append the line and a newline character to our StringBuilder
                sb.append(line + "\n");
            }
        }
        //catch an IOException and print it
        catch (IOException e) {
            e.printStackTrace();
        } 
        //close the stream when we're done
        finally 
        {
            try 
            {
                is.close();
            } 
            //catch and print an exception if it's thrown
            catch (IOException e) 
            {
                e.printStackTrace();
            }
        }
        //return the stream converted to a string
        return sb.toString();
    }
}

这是我的 XML 只是为了好玩:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="company.android.dashboard.app"
    android:versionCode="1"
    android:versionName="1.0" >

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

    <uses-sdk android:minSdkVersion="7" />

    <application
        android:icon="@drawable/company_android_ico"
        android:label="@string/app_name" >
        <activity
            android:name=".DashboardAppActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

我在过去的项目中使用过 HttpHelper 类并且它对我有用，此外我尝试使用 nameValuePairs 实现它:

List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);  
        nameValuePairs.add(new BasicNameValuePair("email", "email@gmail.com"));  
        nameValuePairs.add(new BasicNameValuePair("password", "password1"));
        nameValuePairs.add(new BasicNameValuePair("json", "true"));  
        try {
            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

这产生了相同的结果。

这会不会是证书的事情？或者可能与损坏的 XML 文件有关(我尝试重新制作项目和 xml 文件)Android HTTP Connection refused或者可能是某种 Android 主机文件问题？

我愿意接受任何建议!

我已经从很多角度对此进行了研究，我很乐意提供任何其他有用的信息!非常感谢您的宝贵时间!

注意:出于安全原因，该 url 是一个虚拟 url，而不是我正在连接的实际 url。我能够使用参数从命令行 curl 实际网站并且它有效，我也能够从网络浏览器正常登录。

编辑 我已经确定了问题所在!但不幸的是，这不是解决方案。所以问题是我使用的开发服务器 url 在全局 DNS 服务器上没有域条目。因此，要解决此问题，我需要以某种方式在我的 Android 设备/模拟器中编辑主机文件...有人知道如何合法地完成此操作吗？

Answer 1

我已经找到问题了!所以问题是我使用的开发服务器 url 在全局 DNS 服务器上没有域条目。

所以这个问题有两种可能的解决方案:

1) 在 Android 设备上编辑主机文件(需要 root 手机):How to change the hosts file on android

2) 使服务器在全局 DNS 服务器上注册。(如果您不对网址负责，也很难做到)

无论如何，我希望这对其他人也有帮助!