Question

我正在尝试通过HttpPost连接并向网站发送用户名和密码，然后从该网站接收字符串。我已经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清单文件中启用了Internet权限

我目前的实施方式如下：

  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类看起来像这样：

     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只是为了踢：

<?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>

我在以前的项目中使用过HttpHelper类，它对我有用，另外我尝试使用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));

这产生了同样的结果。

这可能是某种证书吗？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 或者某种Android主机文件问题？

我愿意接受任何建议！

我从很多角度对此进行了检查，我很乐意提供其他有用的信息！我非常感谢你的时间！

注意：出于安全原因，网址是一个虚拟网址，而不是我要连接的网址。我可以使用参数从命令行卷曲实际网站，它可以工作，我也可以从网络浏览器正常登录。

编辑我发现了问题！但遗憾的是，这不是解决方案。所以问题是我使用的是在全局DNS服务器上没有域条目的开发服务器URL。所以为了解决这个问题，我需要在我的Android设备/模拟器中编辑主机文件...有谁知道如何合法地完成这项工作？

Answer 1

我已经确定了问题！所以问题是我使用的是在全局DNS服务器上没有域条目的开发服务器URL。

因此，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（需要生根电话）：How to change the hosts file on android

2）使服务器在全局DNS服务器上注册。（如果你不对网址负责，也很难做到）

无论如何，我希望这也有助于其他人！

Answer 2

请按照这些解决方案解决您的问题。

1＆GT;检查你的清单文件是否有互联网许可。

2 - ;通过rest客户端使用浏览器检查您的URL并传递相应的请求。

3＆GT;在移动设备中打开网址，例如： - http://your IP地址/端口这只是用于检查您是否有权在移动设备中打开此网址。

Answer 3

有几种可能性

1）网址不正确“http://devdashboard.company/login”不正确。至少检查一下浏览器。也可以ping主机。

2）这应该是https连接。

3）需要一些认证。

4）您缺少端口号。或域未正确设置。也许端口80默认是不正确的？

5）电话不应该是一个帖子。

一般而言，您要么对服务器负责，要么您不负责。它似乎是一些其他的责任，你应该问他们正确的网址和参数是什么。所以它可能没有错，但你需要问他们有关验证的连接。

您可以做的另一件事是尝试在成功连接的应用程序中查看网址的外观。看看这个。

Answer 4

问题在于无线睡眠。请使用

WifiManager wm = (WifiManager) getSystemService(Context.WIFI_SERVICE);
wifiLock = wm.createWifiLock(WifiManager.WIFI_MODE_FULL , "MyWifiLock");
wifiLock.acquire();

和许可：

uses-permission android:name="android.permission.WAKE_LOCK";

Answer 5

此帖子很旧，但这是Google搜索此错误时的第一个结果。我遇到了同样的异常，在我的代码中一切都完全正确。我在AndroidManifest.xml中注释掉包含INTERNET权限的行，运行应用程序，单击/点击我的按钮发送HTTP请求并获取异常，关闭应用程序，返回清单，取消注释权限行，运行该应用程序再次，异常已解决！

2015年的这种错误（以及＃34;高级＆＃34;工具，如Android API 21和Intellij IDEA 14的最新编译工具）让我发疯！你正在接近你的截止日期，这种错误完全扰乱了你的工作！

HttpHostConnectException：连接拒绝Android

5 个答案: