php文件可能存在问题,其中包含以下代码:
<?php
mysql_connect("localhost","root","");
mysql_select_db("deal");
$sql=mysql_query("select * from CITY");
while($row=mysql_fetch_assoc($sql))
$output[]=$row;
print(json_encode($output));
mysql_close();
?>
检索db中所有城市的简单代码。 我将此文件放在:C:\ Program Files \ EasyPHP-5.3.9 \ www \ city.php
中java代码非常简单,连接并显示查询结果:
package com.udios.mysql;
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.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.net.ParseException;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Toast;
public class MySQLActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public void onTestClick(View view) {
/*Toast.makeText(MySQLActivity.this, "Test Pressed", Toast.LENGTH_SHORT)
.show();*/
this.runOnUiThread(new Runnable() {
@Override
public void run() {
String result = null;
JSONArray jArray;
InputStream is = null;
StringBuilder sb = null;
try {
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://127.0.0.1/city.php");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
BufferedReader reader = new BufferedReader(
new InputStreamReader(is, "iso-8859-1"), 8);
sb = new StringBuilder();
sb.append(reader.readLine() + "\n");
String line = "0";
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result = sb.toString();
int ct_id;
String ct_name;
Toast.makeText(getBaseContext(), "result is: "+result,
100).show();
jArray = new JSONArray(result);
JSONObject json_data = null;
for (int i = 0; i < jArray.length(); i++) {
json_data = jArray.getJSONObject(i);
ct_id = json_data.getInt("CITY_ID");
ct_name = json_data.getString("CITY_NAME");
Toast.makeText(getBaseContext(), Integer.toString(ct_id)+" : " + ct_name ,
Toast.LENGTH_LONG).show();
}
} catch (JSONException e1) {
Toast.makeText(getBaseContext(), "No City Found",
Toast.LENGTH_LONG).show();
} catch (ParseException e1) {
e1.printStackTrace();
} catch (Exception e1) {
e1.printStackTrace();
}
}
});
}
}
当我尝试直接在浏览器中访问:
我得到: 注意:未定义的变量:第7行的C:\ Program Files \ EasyPHP-5.3.9 \ www \ city.php中的输出 空
我在android中进行调试,此行抛出异常:(最后一次捕获)
HttpPost httppost = new HttpPost("http://127.0.0.1/city.php");
如果我将其更改为10.0.2.2,则会在此行中抛出异常:
HttpResponse response = httpclient.execute(httppost);
我真的尝试了所有组合,有人可以帮助我吗? 非常感谢你 UDI
答案 0 :(得分:3)
第一次向$output
添加行时,未定义。
在PHP代码中的while循环之前添加它。
$output = array();
如果您在模拟器上运行,则还需要连接10.0.2.2,或者在真实设备上运行本地IP(确保设备通过WiFi连接到您的网络)。
答案 1 :(得分:1)
您的HttpPost正在尝试连接正在运行的手机。它需要指向运行服务器的计算机。 127.0.0.1 =此设备。