我试图从远程数据库读取的数据库在我，对于我使用的是PHP的code连接到我的MySQL数据库和查询我的数据库：

该文件的名称：check.php：

 ＆LT; PHP
    require_once（PHP / dbconnect.php）;
    $查询=选择从用户名;
    $结果= mysql_query（$查询）或死亡（无法验证用户，因为：。mysql_error（））;

    而（$行= mysql_fetch_array（$结果））{
        $输出[] = $行['名称'];
    }

    打印（json_en code（$输出））;
    则mysql_close（）;
 ？/＆GT;
 

和Java（安卓）code连接到远程数据库：

 进口java.io.BufferedReader中;
进口的java.io.InputStream;
进口java.io.InputStreamReader中;
进口的java.util.ArrayList;

进口org.apache.http.HttpEntity;
进口org.apache.http.Htt presponse;
进口org.apache.http.NameValuePair;
进口org.apache.http.client.HttpClient;
进口org.apache.http.client.entity.UrlEn codedFormEntity;
进口org.apache.http.client.methods.HttpPost;
进口org.apache.http.impl.client.DefaultHttpClient;
进口org.apache.http.message.BasicNameValuePair;
进口org.json.JSONArray;
进口org.json.JSONException;
进口org.json.JSONObject;

进口android.app.Activity;
进口android.os.Bundle;
进口android.util.Log;
进口android.widget.Toast;
进口java.net.URI中;

公共类ConnectToMyDb延伸活动{
    InputStream的是;
    私人HttpPost httppost;

    @覆盖
    公共无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.main）;
        字符串结果=;

        // HTTP POST
        尝试{
            HttpClient的HttpClient的=新DefaultHttpClient（）;
            httppost =新HttpPost（http://www.Myurl.com/check.php）;

            HTT presponse响应= httpclient.execute（httppost）;
            HttpEntity实体= response.getEntity（）;
            是= entity.getContent（）;
            Log.e（log_tag，连接成功）;
            Toast.makeText（getApplicationContext（），通，Toast.LENGTH_SHORT）.show（）;
        }赶上（例外五）{
            Log.e（log_tag，错误的HTTP连接+ e.toString（））;
            Toast.makeText（getApplicationContext（），不合格，Toast.LENGTH_SHORT）.show（）;

        }

        //转换响应串
        尝试{
            的BufferedReader读卡器=新的BufferedReader（新InputStreamReader的（就是，ISO-8859-1），8）;
            StringBuilder的SB =新的StringBuilder（）;
            串线= NULL;

            而（（行= reader.readLine（））！= NULL）{
                    sb.append（行+\ N）;
                    Toast.makeText（getApplicationContext（），通，Toast.LENGTH_SHORT）.show（）;
        }

        is.close（）;

        结果= sb.toString（）;
    }赶上（例外五）{
        Log.e（log_tag，错误转换结果+ e.toString（））;
        Toast.makeText（getApplicationContext（），不合格，Toast.LENGTH_SHORT）.show（）;
    }

    //解析JSON数据
    尝试{
        // ArrayList的＆LT;邮件＆gt; RESULT1 =新的ArrayList＆LT;邮件＆gt;（）;
        JSONArray jArray =新JSONArray（结果）;
        JSONObject的json_data =新的JSONObject的（结果）;

        的for（int i = 0; I＆LT; jArray.length（）;我++）{
            json_data = jArray.getJSONObject（ⅰ）;

            Log.i（log_tag，姓名：+ json_data.getString（姓名）;
                    Toast.makeText（getApplicationContext（），通，Toast.LENGTH_SHORT）.show（）;
        }
    }赶上（JSONException E）{
        Log.e（log_tag，错误分析数据+ e.toString（））;
        Toast.makeText（getApplicationContext（），不合格，Toast.LENGTH_SHORT）.show（）;
    }
}
 

我的问题它不是连接，但JSON的解析我得到一个异常：

 错误解析数据org.json.JSONException：
值小于;！java.lang.String类型的DOCTYPE不能转换为JSONArray
 

解决方案

我会摆脱这行：

  JSONArray jArray =新JSONArray（结果）;
 

和这样做，而不是：

 的JSONObject json_data =新的JSONObject的（结果）;
JSONArray nameArray = json_data.names（）;
JSONArray的valarray = json.toJSONArray（nameArray）;
 

我相信这是正确的，然而，请学习本教程，它会为你工作：

的 Android作为一个RESTful客户端

I am trying to read a database in my from a remote DB, for that i am using a php code to connect to my Mysql DB and to query my DB:

Name of the file: check.php:

<?php
    require_once("php/dbconnect.php");
    $query = "SELECT name FROM user ";
    $result = mysql_query($query) or die("Unable to verify user because : " . mysql_error());

    while ( $row = mysql_fetch_array( $result ) ) {
        $output[]=$row['name'];
    }

    print(json_encode($output));
    mysql_close();
 ?/>

And the Java (Android) code to connect to the remote DB:

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
import java.net.URI;

public class ConnectToMyDb extends Activity {
    InputStream is;
    private HttpPost httppost;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        String result = "";

        //http post
        try{
            HttpClient httpclient = new DefaultHttpClient();
            httppost = new HttpPost("http://www.Myurl.com/check.php");

            HttpResponse response = httpclient.execute(httppost); 
            HttpEntity entity = response.getEntity();
            is = entity.getContent();
            Log.e("log_tag", "connection success ");
            Toast.makeText(getApplicationContext(), "pass", Toast.LENGTH_SHORT).show();
        }catch(Exception e){
            Log.e("log_tag", "Error in http connection "+e.toString());
            Toast.makeText(getApplicationContext(), "fail", Toast.LENGTH_SHORT).show();

        }

        //convert response to string
        try{
            BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
            StringBuilder sb = new StringBuilder();
            String line = null;

            while ((line = reader.readLine()) != null) {
                    sb.append(line + "\n");
                    Toast.makeText(getApplicationContext(), "pass", Toast.LENGTH_SHORT).show();
        }

        is.close();

        result=sb.toString();
    }catch(Exception e){
        Log.e("log_tag", "Error converting result "+e.toString());
        Toast.makeText(getApplicationContext(), "fail", Toast.LENGTH_SHORT).show();
    }

    //parse json data
    try{
        //ArrayList<Messages> result1 = new ArrayList<Messages>();
        JSONArray jArray = new JSONArray(result);
        JSONObject json_data= new JSONObject(result);

        for(int i=0;i<jArray.length();i++){
            json_data = jArray.getJSONObject(i);

            Log.i("log_tag"," name: "+json_data.getString("name");
                    Toast.makeText(getApplicationContext(), "pass", Toast.LENGTH_SHORT).show();
        }
    }catch(JSONException e){
        Log.e("log_tag", "Error parsing data "+e.toString());
        Toast.makeText(getApplicationContext(), "fail", Toast.LENGTH_SHORT).show();
    }
}

My problem its not the connection but the parsing of the json i get an exception:

Error parsing data org.json.JSONException:  
Value <!DOCTYPE of type java.lang.String cannot  be converted to JSONArray

I would get rid of this line:

JSONArray jArray = new JSONArray(result);

and do this instead:

JSONObject json_data = new JSONObject(result);
JSONArray nameArray = json_data.names();
JSONArray valArray = json.toJSONArray(nameArray);

I believe this is correct, nonetheless, please study this tutorial, it will work for you:

Android as a Restful Client