php - android +从mysql数据库检索数据

Question

我正在创建一个可以访问外部数据库以检索一些数据的移动应用程序，但问题出在日志猫中，我遇到了错误有人可以帮助我，我将不胜感激

如日志猫所示，系统错误发生在* HttpResponse response = httpclient.execute(httppost); *中，因此该如何解决？

TestExternalDatabaseActivity.java

package com.taseen.apps;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.DefaultClientConnection;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.R.array;
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.widget.TextView;

public class TestExternalDatabaseActivity extends Activity {

    TextView resultView;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.testexternaldatabase);

    resultView =(TextView)findViewById(R.id.result);
    getData();



    }


   public void getData() 
   {
       String  result = "";
       InputStream isr = null;

       try {
        HttpClient httpclient = new DefaultHttpClient();
           HttpPost httppost = new  HttpPost("127.0.0.2/getAllCustomers.php");
           HttpResponse response  = httpclient.execute(httppost);
           HttpEntity entity = response.getEntity();
           try {
            isr = entity.getContent();
        } catch (IllegalStateException e4) {
            // TODO Auto-generated catch block
            e4.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    } catch (ClientProtocolException e) {
        // TODO Auto-generated catch block
        Log.e("log-tag", "Error in  connection"+e.toString());
        resultView.setText("could not connect to database");


        //convert response to string 

        try {
            BufferedReader reader = new  BufferedReader(new InputStreamReader(isr, "iso-8859-1"),8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while((line = reader.readLine())!= null)
            {
                sb.append(line + "\n");

            }
            isr.close();

            result = sb.toString();
        } catch (UnsupportedEncodingException e1) {
            // TODO Auto-generated catch block
            Log.e("Log-tag", "Error converting  result" +e.toString());




    //parse json data

            try {
                String s ="";
                JSONArray jArray = new JSONArray(result);

                for(int i = 0; i<jArray.length(); i++)
                {
                    JSONObject json = jArray.getJSONObject(i);
                    s =  s +
                            "Name: "+json.getString("FirstName")+" "+json.getString("LastName")+"\n"+
                            "Age: "+json.getString("Age")+"\n"+
                            "Mobile Used: "+json.getString("Mobile")+"\n\n";

                }

                resultView.setText(s);
            } catch (JSONException e2) {
                // TODO Auto-generated catch block
                Log.e("log-tag", "Error parsing data"+e.toString());
            }


    } catch (IOException e3) {
            // TODO Auto-generated catch block
            e3.printStackTrace();
        }





   } catch (IOException e5) {
        // TODO Auto-generated catch block
        e5.printStackTrace();
    }

  }
}

日志猫

04-02 20:47:58.223: E/log-tag(699): before the first try
04-02 20:47:58.223: E/log-tag(699): after the httpclient
04-02 20:47:58.282: E/log-tag(699): after the httppostt
04-02 20:47:58.352: W/System.err(699): org.apache.http.conn.HttpHostConnectException: Connection to http://127.0.0.2 refused
04-02 20:47:58.362: W/System.err(699):  at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:178)
04-02 20:47:58.362: W/System.err(699):  at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
04-02 20:47:58.362: W/System.err(699):  at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
04-02 20:47:58.362: W/System.err(699):  at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:359)
04-02 20:47:58.372: W/System.err(699):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
04-02 20:47:58.372: W/System.err(699):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
04-02 20:47:58.372: W/System.err(699):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
04-02 20:47:58.372: W/System.err(699):  at com.taseen.apps.TestExternalDatabaseActivity.getData(TestExternalDatabaseActivity.java:60)
04-02 20:47:58.372: W/System.err(699):  at com.taseen.apps.TestExternalDatabaseActivity.onCreate(TestExternalDatabaseActivity.java:38)
04-02 20:47:58.372: W/System.err(699):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-02 20:47:58.372: W/System.err(699):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
04-02 20:47:58.372: W/System.err(699):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
04-02 20:47:58.475: W/System.err(699):  at android.app.ActivityThread.access$1500(ActivityThread.java:117)
04-02 20:47:58.475: W/System.err(699):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
04-02 20:47:58.475: W/System.err(699):  at android.os.Handler.dispatchMessage(Handler.java:99)
04-02 20:47:58.475: W/System.err(699):  at android.os.Looper.loop(Looper.java:123)
04-02 20:47:58.475: W/System.err(699):  at android.app.ActivityThread.main(ActivityThread.java:3683)
04-02 20:47:58.475: W/System.err(699):  at java.lang.reflect.Method.invokeNative(Native Method)
04-02 20:47:58.475: W/System.err(699):  at java.lang.reflect.Method.invoke(Method.java:507)
04-02 20:47:58.482: W/System.err(699):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
04-02 20:47:58.482: W/System.err(699):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
04-02 20:47:58.482: W/System.err(699):  at dalvik.system.NativeStart.main(Native Method)
04-02 20:47:58.482: W/System.err(699): Caused by: java.net.ConnectException: /127.0.0.2:80 - Connection refused
04-02 20:47:58.493: W/System.err(699):  at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:207)
04-02 20:47:58.493: W/System.err(699):  at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:437)
04-02 20:47:58.493: W/System.err(699):  at java.net.Socket.connect(Socket.java:983)
04-02 20:47:58.493: W/System.err(699):  at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
04-02 20:47:58.493: W/System.err(699):  at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:143)
04-02 20:47:58.493: W/System.err(699):  ... 21 more
04-02 20:47:58.493: E/log-tag(699): error in the get data function

getAllCustomers.php

<?php

$con = mysql_connect("localhost", "root", "root")or die(mysql_error());

mysql_select_db("TestDatabase", $con) or die("can not connect to the database");
$result = mysql_query("SELECT * FROM customer")or die(mysql_error());

while($row = mysql_fetch_assoc($result))
{
    $output[] = $row;
}
  print(json_encode($output));

  mysql_close();

?>

Answer 1

好的，我有一个类似的问题。

我解决了如下

在您的计算机中访问cmd并键入ipconfig，获取您的IP地址并替换为127.0.0.2。

诸如此类(如果是我的计算机):

HttpPost httppost = new  HttpPost("192.168.0.5/getAllCustomers.php");

我希望它有效

如果不起作用，请尝试关闭您的防病毒软件，以我为例，avast阻止了我的访问。