Question

我正在尝试使用此代码读取localhost上的网页。它在尝试阅读实际网页时有效，但在尝试使用我的localhost网页时会显示此消息。有人可以建议错误或提供替代解决方案吗？感谢。

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLConnection;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {

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

        Button sendbutton = (Button)findViewById(R.id.button1);
        sendbutton.setOnClickListener(new OnClickListener(){

        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            Log.i("clicked","button");
            Thread th = new Thread()
            {
                public void run()
                {
                    try
                    {
                    Log.i("clicked", "Button");
                    String url = "http://140.254.191.124/test/index.php";
                    Log.i("inside","thread");
                    String tmp = ReadWebPage(url);
                    Log.i("response", tmp);
                    }
                    catch(Exception e)
                    {
                        e.printStackTrace();
                    }
                }
            };
            th.start();
        }});

        }

    public String ReadWebPage (String URL){
        BufferedReader in = null;
        String page = "null";
        HttpClient client = new DefaultHttpClient();
        HttpGet request = new HttpGet();
        try{
            request.setURI(new URI(URL));
            request.addHeader("accept", "application/json");
            HttpResponse response = null;
            response = client.execute(request);
            in = new BufferedReader (new InputStreamReader(response.getEntity().getContent()));

            StringBuffer sb = new StringBuffer("");
            String line = "";
            String NL = System.getProperty("line.separator");
            while ((line = in.readLine()) != null) {
                sb.append(line + NL);
            }

            page = sb.toString();
            System.out.println(page);
            Toast.makeText(MainActivity.this, page, Toast.LENGTH_LONG).show();
            if (in != null) in.close();
        } catch (URISyntaxException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalStateException e) {
        // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return page;
    }

这是我得到的信息。我使用三星Galaxy S4测试代码。

01-31 19:28:20.027: I/clicked(9133): button
01-31 19:28:20.027: I/clicked(9133): Button
01-31 19:28:20.027: I/inside(9133): thread
01-31 19:28:20.027: I/APACHE HTTP (thCr=180433) - NafHttpAuthStrategyDefault(9133): (thUse=180433) NafHttpAuthStrategyDefault()
01-31 19:28:20.027: I/APACHE HTTP (thCr=180433) - KeeperManager(9133): (thUse=180433) INITIALIZATION of shared resources
01-31 19:28:20.027: I/APACHE HTTP (thCr=180433) - AndroidContextProviderImpl(9133): (thUse=180433)    currentActivityThread=android.app.ActivityThread@43099610
01-31 19:28:20.057: I/APACHE HTTP (thCr=180433) - NafHttpAuthStrategyDefault(9133): (thUse=180433)    cached value : gbaSupportIsPossible=null
01-31 19:28:20.057: I/APACHE HTTP (thCr=180433) - NafHttpAuthStrategyDefault(9133): (thUse=180433)    The current context is NOT a context of GBA service.
01-31 19:28:20.067: I/APACHE HTTP (thCr=180433) - GbaSupportPermissionRequestCheckerImpl(9133): (thUse=180433) isCurrentProcessRequestedGba()#finished   result=false
01-31 19:28:20.067: I/APACHE HTTP (thCr=180433) - GbaSupportPermissionRequestCheckerImpl(9133): (thUse=180433) isCurrentProcessAllowedToUseGba()#started   result=false
01-31 19:28:20.067: I/APACHE HTTP (thCr=180433) - NafHttpAuthStrategyDefault(9133): (thUse=180433)    The GBA permission wasn't requested for this process.
01-31 19:28:20.067: I/APACHE HTTP (thCr=180433) - NafHttpAuthStrategyDefault(9133): (thUse=180433) It is impossible to support GBA now (many possible reasons: no Android Context, current client is GBA service, etc.), then it will be just usual HTTP.
01-31 19:28:20.067: I/APACHE HTTP (thCr=180433) - NafRequestExecutorWrapperRedirectionHandler(9133): (thUse=180433)    It isn't GBA flow, redirection responses are not handled.

Answer 1

查看apache http client NafHttpAuthStrategyDefault

BTW我建议您使用AsyncTask作为后台任务。为了避免使用HttpURLConnection进行繁琐且容易出错的编码，您可以使用抽象库。这是一个option and a list of alternatives。

另一点：您确定要加载网页吗？因为您的Web服务器的内容协商应该返回'application / json'。

Answer 2

我找到了一个使用HttpURLConnection方法的工作。它工作得很好。有关详细信息，请参阅此HttpURLConnection

Android - 连接到localhost时HTTP无法正常工作

2 个答案: