我目前正在尝试开发一个应用程序,其中包括可以发送和接收来自MySQL服务器的数据。从MySQL获取数据到Android与PHP
该应用程序调用一个php脚本,它使连接到mysql服务器。我已经成功开发了发送部分,现在我想从mysql中检索数据并将其显示在android手机上。
MySQL表由5列组成:
bssid
building
floor
lon
lat
PHP文件getdata.php
包含:
<?php
$con = mysql_connect("localhost","root","xxx");
if(!$con)
{
echo 'Not connected';
echo ' - ';
}else
{
echo 'Connection Established';
echo ' - ';
}
$db = mysql_select_db("android");
if(!$db)
{
echo 'No database selected';
}else
{
echo 'Database selected';
}
$sql = mysql_query("SELECT building,floor,lon,lat FROM ap_location WHERE bssid='00:19:07:8e:f7:b0'");
while($row=mysql_fetch_assoc($sql))
$output[]=$row;
print(json_encode($output));
mysql_close(); ?>
这部分工作正常,在浏览器中测试时。
用于连接到PHP中的Java代码:
public class Database {
public static Object[] getData(){
String db_url = "http://xx.xx.xx.xx/getdata.php";
InputStream is = null;
String line = null;
ArrayList<NameValuePair> request = new ArrayList<NameValuePair>();
request.add(new BasicNameValuePair("bssid",bssid));
Object returnValue[] = new Object[4];
try
{
HttpClient httpclient = new DefaultHttpClient();
HttpContext localContext = new BasicHttpContext();
HttpPost httppost = new HttpPost(db_url);
httppost.setEntity(new UrlEncodedFormEntity(request));
HttpResponse response = httpclient.execute(httppost, localContext);
HttpEntity entity = response.getEntity();
is = entity.getContent();
}catch(Exception e){
Log.e("log_tag", "Error in http connection" +e.toString());
}
String result = "";
try
{
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
StringBuilder sb = new StringBuilder();
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result=sb.toString();
}catch(Exception e){
Log.e("log_tag", "Error in http connection" +e.toString());
}
try
{
JSONArray jArray = new JSONArray(result);
JSONObject json_data = jArray.getJSONObject(0);
returnValue[0] = (json_data.getString("building"));
returnValue[1] = (json_data.getString("floor"));
returnValue[2] = (json_data.getString("lon"));
returnValue[3] = (json_data.getString("lat"));
}catch(JSONException e){
Log.e("log_tag", "Error parsing data" +e.toString());
}
return returnValue;
}
}
这是用于将数据发送到MySQL服务器,修改代码,但什么是错的。 我试图通过在代码中设置不同的returnValue
来测试它,这说明带有httpclient
连接的部件不运行。
你们能帮我吗?
我希望这不是太困扰,如果你想,我可以试着解释一下。
BUMP测试。我需要进一步解释我的问题吗? – freddy 2011-12-20 23:44:06
我测试了代码,它适用于我。 – 2011-12-22 02:02:57
您是否已将此权限添加到清单文件中? '<使用权限android:name =“android.permission.INTERNET”/>''' – Hovo 2014-12-19 02:28:50