我正在尝试检查网站状态是否在线

【问题标题】：I am trying to check a website status if its online or not我正在尝试检查网站状态是否在线
【发布时间】：2016-01-12 18:29:57
【问题描述】：

我正在开发一个连接到网站并从中获取一些数据的应用程序。我遇到的问题是当我尝试通过 HttpURLConnection 检查网站是否处于活动状态时，但它的说该网站大多处于离线状态。当我从手机浏览器访问网站时，网站正在工作。有时当我第一次打开应用程序时，它说网站离线，但是当我关闭应用程序并再次打开它时，它主要连接。我正在检查网站响应时间，如果它等于200，那么网站是活动的，但我不知道出了什么问题。我用线程给 strong>asynctask，但仍不能完美运行。

这里是代码。

package com.bu.innovate.bustudentportal;


import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.LinearLayout;
import android.widget.Toast;

import com.pnikosis.materialishprogress.ProgressWheel;

import java.io.File;
import java.io.FileInputStream;
import java.io.ObjectInputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;

public class Splash_Activity extends Activity implements Animation.AnimationListener {

    UserSessionManager session;
    Data data;
    ProgressWheel progress;

    boolean check;
    String url = "";

    FileInputStream inputStream;
    String filename = "newMyProfileData";
    Animation animFadein;
    Animation animFadeout;
    LinearLayout linearLayout;

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        boolean finish = getIntent().getBooleanExtra("finish", false);
        if (finish) {

            finish();
            return;
        }
        setContentView(R.layout.splast_activty);


        linearLayout = (LinearLayout) findViewById(R.id.splash);

        progress = (ProgressWheel) findViewById(R.id.progressbar);

        session = new UserSessionManager(getApplicationContext());
        HashMap<String, String> user = session.getUserDetails();

        url = user.get(UserSessionManager.KEY_URL);

        animFadein = AnimationUtils.loadAnimation(this,
                R.anim.blink);
        animFadeout = AnimationUtils.loadAnimation(this,
                R.anim.fade_out);
        animFadein.setAnimationListener(this);
        animFadeout.setAnimationListener(this);

        animFadein.setDuration(1300);
        animFadeout.setDuration(1000);
        animFadeout.setStartOffset(1200 + animFadein.getStartOffset() + 1200);


        data = new Data(getApplicationContext());

        progress.spin();

        if(animFadein!=null)
        {
            linearLayout.startAnimation(animFadein);

        }

        if (!session.checkLogin() && isOnline()) {

            final Handler handler2 = new Handler();
            handler2.postDelayed(new Runnable() {
                @Override
                public void run() {
                    new checkingnetwork().execute();
                }
            }, 2000);


            final Handler handler = new Handler();
            handler.postDelayed(new Runnable() {
                @Override
                public void run() {
                    getcheck();
                }
            }, 5000);
        }
        else if (!session.checkLogin() && !isOnline()) {

            final Handler handler = new Handler();
            handler.postDelayed(new Runnable() {
                @Override
                public void run() {
                    getcheck();
                }
            }, 4000);

        } else {
            getcheck();
        }
    }

public class checkingnetwork extends AsyncTask<Void, Void, Void> {
        @Override
        protected Void doInBackground(Void... params) {
            try {

                // FIRST METHOD I TRIED
                HttpURLConnection urlc = (HttpURLConnection) (new URL(url).openConnection());
                urlc.setRequestProperty("User-Agent", "Test");
                urlc.setRequestProperty("Connection", "close");
                urlc.setConnectTimeout(3000);
                urlc.connect();
                check = (urlc.getResponseCode() == 200);

                // SECOND METHOD I TRIED
                HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
                connection.setConnectTimeout(5000);
                connection.setReadTimeout(5000);
                connection.setRequestMethod("HEAD");
                int responseCode = connection.getResponseCode();
                check =  (200 <= responseCode && responseCode <= 399);

                System.out.print(responseCode);

            } catch (Exception e) {
                e.printStackTrace();
            }

            return null;

        }
    }

}

这是logcat

1-11 23:04:24.804 10320-10638/com.bu.innovate.bustudentportal I/System.out: (HTTPLog)-Static: SBServiceAPI: getService class android.os.ServiceManager
01-11 23:04:24.804 10320-10638/com.bu.innovate.bustudentportal I/System.out: (HTTPLog)-Static: isShipBuild true
01-11 23:04:24.804 10320-10638/com.bu.innovate.bustudentportal I/System.out: (HTTPLog)-Thread-18855-353874012: SmartBonding Enabling is true, SHIP_BUILD is true, log to file is false, DBG is false
01-11 23:04:26.204 10320-10320/com.bu.innovate.bustudentportal D/ViewRootImpl: ViewPostImeInputStage ACTION_DOWN
01-11 23:04:27.824 10320-10320/com.bu.innovate.bustudentportal I/Timeline: Timeline: Activity_launch_request id:com.bu.innovate.bustudentportal time:27606813
01-11 23:04:27.984 10320-10320/com.bu.innovate.bustudentportal D/debug: Screen inches : 5.2007338145504045
01-11 23:04:27.994 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/abc_ic_ab_back_mtrl_am_alpha.png
01-11 23:04:28.024 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable/header.jpg
01-11 23:04:28.114 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/profile_picture.png
01-11 23:04:28.204 10320-10320/com.bu.innovate.bustudentportal D/Activity: performCreate Call secproduct feature valuefalse
01-11 23:04:28.204 10320-10320/com.bu.innovate.bustudentportal D/Activity: performCreate Call debug elastic valuetrue
01-11 23:04:28.234 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/tick_logo.png
01-11 23:04:28.234 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/time_logo.png
01-11 23:04:28.234 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/result_logo.png
01-11 23:04:28.274 10320-10320/com.bu.innovate.bustudentportal D/AbsListView: Get MotionRecognitionManager
01-11 23:04:28.294 10320-10320/com.bu.innovate.bustudentportal D/AbsListView: Get MotionRecognitionManager
01-11 23:04:28.324 10320-10320/com.bu.innovate.bustudentportal D/AbsListView: Get MotionRecognitionManager
01-11 23:04:28.334 10320-10320/com.bu.innovate.bustudentportal D/AbsListView: Get MotionRecognitionManager
01-11 23:04:28.484 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/profile_logo.png
01-11 23:04:28.484 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/progress_logo.png
01-11 23:04:28.484 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/notification_logo.png
01-11 23:04:28.494 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/eva.png
01-11 23:04:28.494 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/password_logo.png
01-11 23:04:28.504 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/feedback_logo.png
01-11 23:04:28.514 10320-10320/com.bu.innovate.bustudentportal V/BitmapFactory: DecodeImagePath(decodeResourceStream3) : res/drawable-xxhdpi-v4/privacy_logo.png
01-11 23:04:28.524 10320-10320/com.bu.innovate.bustudentportal W/View: requestLayout() improperly called by android.support.v7.widget.AppCompatImageView{3bfd695e V.ED.... ......ID 0,0-0,0 #7f0d01ad app:id/selector} during layout: running second layout pass
01-11 23:04:28.524 10320-10320/com.bu.innovate.bustudentportal W/View: requestLayout() improperly called by android.support.v7.widget.AppCompatImageView{1db4b13f V.ED.... ......I. 0,0-0,0 #7f0d01ad app:id/selector} during layout: running second layout pass
01-11 23:04:28.524 10320-10320/com.bu.innovate.bustudentportal W/View: requestLayout() improperly called by android.support.v7.widget.AppCompatImageView{9aada0c V.ED.... ......I. 0,0-0,0 #7f0d01ad app:id/selector} during layout: running second layout pass
01-11 23:04:28.644 10320-10320/com.bu.innovate.bustudentportal I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@12a519a2 time:27607635
01-11 23:04:28.644 10320-10320/com.bu.innovate.bustudentportal I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@29c55571 time:27607635
01-11 23:04:30.024 10320-10638/com.bu.innovate.bustudentportal W/System.err: java.net.SocketTimeoutException
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err:     at java.net.PlainSocketImpl.read(PlainSocketImpl.java:488)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err:     at java.net.PlainSocketImpl.access$000(PlainSocketImpl.java:37)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err:     at java.net.PlainSocketImpl$PlainSocketInputStream.read(PlainSocketImpl.java:237)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err:     at com.android.okio.Okio$2.read(Okio.java:116)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err:     at com.android.okio.RealBufferedSource.indexOf(RealBufferedSource.java:150)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err:     at com.android.okio.RealBufferedSource.readUtf8LineStrict(RealBufferedSource.java:97)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err:     at com.android.okhttp.internal.http.HttpConnection.readResponse(HttpConnection.java:198)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err:     at com.android.okhttp.internal.http.HttpTransport.readResponseHeaders(HttpTransport.java:119)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err:     at com.android.okhttp.internal.http.HttpEngine.readResponse(HttpEngine.java:777)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err:     at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:379)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err:     at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:323)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err:     at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:491)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err:     at com.bu.innovate.bustudentportal.Splash_Activity$checkingnetwork.doInBackground(Splash_Activity.java:223)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err:     at com.bu.innovate.bustudentportal.Splash_Activity$checkingnetwork.doInBackground(Splash_Activity.java:208)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err:     at android.os.AsyncTask$2.call(AsyncTask.java:288)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err:     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err:     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
01-11 23:04:30.044 10320-10638/com.bu.innovate.bustudentportal W/System.err:     at java.lang.Thread.run(Thread.java:818)
01-11 23:05:00.344 10320-10351/com.bu.innovate.bustudentportal I/art: Debugger is no longer active
01-11 23:05:00.644 10320-10320/com.bu.innovate.bustudentportal D/ViewRootImpl: ViewPostImeInputStage ACTION_DOWN
01-11 23:06:03.744 10320-10320/com.bu.innovate.bustudentportal I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@12a519a2 time:27702733

我已经尽一切努力让它工作，但我不知道我做错了什么。如果你能帮我解决这个问题，那将非常有帮助。

【问题讨论】：

  • 正如您在错误日志中看到的那样：java.net.SocketTimeoutException，这意味着您的代码无法在您设置的时间限制内连接到服务器。网站在浏览器上加载通常需要多长时间？
  • @Kakarot 如果网络慢，通常需要大约 1 秒或最多 2 秒
  • 如果您在 4xx 系列中获得状态码，那么我们可以说网站因 eg.404 错误而处于离线状态。
  • @dullpointer 我尝试了中提到的第二种方法来检查状态码是否在 200 到 400 之间，然后该站点没有离线，但它也不起作用
  • 关于第二种方法。 w3.org/Protocols/rfc2616/rfc2616-sec9.html HEAD 方法与 GET 相同，只是服务器不能在响应中返回消息体。您能否尝试使用 GET 而不是 HEAD 并且请增加超时时间，并且不要忘记 url 必须使用协议

标签： java android android-asynctask httpresponse httpurlconnection


【解决方案1】：

我试过了

package gorand.com.myapplication111;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import java.net.HttpURLConnection;
import java.net.URL;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Button button1 = (Button) findViewById(R.id.btn_connect);

    button1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            final CheckingSiteResponse task = new CheckingSiteResponse("http://111.68.99.8/StudentProfile/");
            task.execute();

        }
    });
}

public class CheckingSiteResponse extends AsyncTask<Void, Void, Boolean> {

    private final String mUrl;

    CheckingSiteResponse(String url) {
        mUrl = url;
    }

    @Override
    protected Boolean doInBackground(Void... params) {

        Boolean result = false;

        try {
            HttpURLConnection connection = (HttpURLConnection) new URL(mUrl).openConnection();
            connection.setConnectTimeout(15000);
            connection.setReadTimeout(15000);
            connection.setRequestMethod("HEAD");
            int responseCode = connection.getResponseCode();
            result = (200 >= responseCode && responseCode <= 399);

            Log.e("TAG", "RESPONCE = " + responseCode);

        } catch (Exception e) {
            e.printStackTrace();
        }

        return result;
    }

    @Override
    protected void onPostExecute(Boolean result) {
        super.onPostExecute(result);
        Toast.makeText(MainActivity.this, "ONLINE = " + result, Toast.LENGTH_LONG).show();
    }
}

}

而且效果很好。 不要忘记包括

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

到AndroidManifest.xml

【讨论】：

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