Android：连接被拒绝错误

Posted 2023-02-25

【中文标题】Android：连接被拒绝错误

【英文标题】：Android: Connection refused error

【发布时间】：2016-12-09 08:10:07

【问题描述】：

我在连接到我的服务器时收到错误“连接被拒绝”。 在浏览器中打开 url 工作正常。我的应用程序具有互联网权限。 这是堆栈跟踪：

08-03 16:17:05.549 28233-28267/appname.myname.com.appname W/System: ClassLoader referenced unknown path: /data/data/appname.myname.com.appname/lib
08-03 16:17:07.336 28233-28321/appname.myname.com.appname W/System.err: java.net.ConnectException: Connection refused
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at java.net.PlainSocketImpl.socketConnect(Native Method)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:334)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:196)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:178)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:356)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at java.net.Socket.connect(Socket.java:586)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at com.android.okhttp.internal.Platform.connectSocket(Platform.java:113)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at com.android.okhttp.Connection.connectSocket(Connection.java:196)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at com.android.okhttp.Connection.connect(Connection.java:172)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at com.android.okhttp.Connection.connectAndSetOwner(Connection.java:367)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at com.android.okhttp.OkHttpClient$1.connectAndSetOwner(OkHttpClient.java:130)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:329)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:246)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:457)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:405)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:243)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at appname.myname.com.appname.Search$Async$override.doInBackground(Search.java:63)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at appname.myname.com.appname.Search$Async$override.access$dispatch(Search.java)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at appname.myname.com.appname.Search$Async.doInBackground(Search.java:0)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at appname.myname.com.appname.Search$Async.doInBackground(Search.java:50)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at android.os.AsyncTask$2.call(AsyncTask.java:304)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
08-03 16:17:07.338 28233-28321/appname.myname.com.appname W/System.err:     at java.lang.Thread.run(Thread.java:761)

这是我的课：

public static class Async extends AsyncTask<String, Integer, String> 

    @Override
    protected String doInBackground(String... params) 
        URL url = null;
        try 
            url = new URL("http://localhost:80/mysql/php.php");
        catch (MalformedURLException ex)
            ex.printStackTrace();
        
        try 
            URLConnection conn = url.openConnection();
            conn.setDoOutput(true);
            BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            StringBuilder sb = new StringBuilder();
            String line;
            while ((line = reader.readLine()) != null) 
                sb.append(line);
            
            Log.d("dd", "e" + line);
        catch(IOException ex)
            ex.printStackTrace();
        

        return "";
    

是应用有问题，还是我的服务器有问题？

【参考方案1】：

修复它。问题是我在我的电脑上使用了防火墙...

【参考方案2】：

我想我有那个确切的问题。但是，我正在通过一个 HttpClient，这似乎与您的代码不同。我这样做是为了解决我的问题，它可能会给你一个提示：

public static void maybeCreateHttpClient() 
    if (mHttpClient == null) 
        mHttpClient = new DefaultHttpClient();
        final HttpParams params = mHttpClient.getParams();
        HttpConnectionParams.setConnectionTimeout(params,
                REGISTRATION_TIMEOUT);
        HttpConnectionParams.setSoTimeout(params, REGISTRATION_TIMEOUT);
        ConnManagerParams.setTimeout(params, REGISTRATION_TIMEOUT);
        HttpProtocolParams.setUserAgent(params, USER_AGENT);
        HttpProtocolParams.setContentCharset(params, "UTF-8");

        // And the line that I addded to help me out:
        HttpProtocolParams.setUseExpectContinue(params, false);
    

【讨论】：

HttpClient 已弃用，我无法使用它。难道没有其他方法可以做到这一点吗？