Android中通过json向MySql中读写数据的方法（二）

首先 要定义几个解析json的方法parseJsonMulti，代码如下：

private void parseJsonMulti(String strResult) {
try {

Log.v("strResult11","strResult11="+strResult);

int index=strResult.indexOf("[");
if(index>0)
strResult=strResult.substring(index, strResult.length());

Log.v("strResult22","strResult22="+strResult);
wifiMapData = new JSONArray(strResult);

Log.v("wifiMapDataLength",""+wifiMapData.length());

for(int i = 0; i < wifiMapData.length() ; i++){///基站信息处理
///MapData m=new MapData(1, dLat[5], dLong[5], 10, 20, 300, 500, 105, "教1", 1, 1, 4);

JSONObject jsonObject = wifiMapData.getJSONObject(i);

int id=Integer.parseInt(jsonObject.getString("id"));	//id

// if(jsonObject.isNull("mac_address")) mac_address="";
String mac_address = jsonObject.getString("mac_address");//wifi的mac地址

String wifi_name=jsonObject.getString("wifi_name");	//ssid

if(!jsonObject.isNull("lat")&&!jsonObject.isNull("lon")){

lat= Double.valueOf(jsonObject.getString("lat"));//纬度

lon=Double.valueOf(jsonObject.getString("lon"));//经度

}
String location_name=jsonObject.getString("location_name");	//ssid

String wifi_adds = jsonObject.getString("wifi_adds");//wifi地址 具体到多少路多少号

String area = jsonObject.getString("area");//北京的什么区

String location_type = jsonObject.getString("location_type");//地点是个什么类型的，写字楼？？

String ap_free = jsonObject.getString("ap_free");//ap是否免费

String category = jsonObject.getString("category");//ap是否免费

String password = jsonObject.getString("password");//ap是否免费

String capabilities = jsonObject.getString("capabilities");//ap是否免费

String user_score = jsonObject.getString("user_score");//ap是否免费

String NW_score = jsonObject.getString("NW_score");//ap是否免费
}
// tvJson.setText(s);
} catch (JSONException e) {
System.out.println("Jsons parse error !");
e.printStackTrace();
}
}

再定义一个向MySql发送http请求的方法connServerForResult，代码如下：

private String connServerForResult(String strUrl) {
// HttpGet对象
HttpGet httpRequest = new HttpGet(strUrl);
String strResult = "";
try {
// HttpClient对象
HttpClient httpClient = new DefaultHttpClient();
// 获得HttpResponse对象
HttpResponse httpResponse = httpClient.execute(httpRequest);
if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
// 取得返回的数据
strResult = EntityUtils.toString(httpResponse.getEntity());
}
} catch (ClientProtocolException e) {

Toast.makeText(Setting.this,
"protocol error", Toast.LENGTH_SHORT).show();

e.printStackTrace();
} catch (IOException e) {
Toast.makeText(Setting.this,
"IO error", Toast.LENGTH_SHORT).show();

e.printStackTrace();
}
return strResult;
}

然后就是在主程序中调用这两个方法：代码如下

String strUrl1 = "http://192.168.1.2/call_for_wifiMapData.php";
//获得返回的Json字符串
String strResult1 = connServerForResult(strUrl1);

Log.v("strResult1",strResult1);

parseJsonMulti(strResult1);

只有几句话而已，php同样要替换成你自己的文件路径，

php代码如下：

<?php

$jsonArrayString = $_POST["jsonArrayString"];
$jsonString = $_POST["jsonString"];
$objArray=json_decode($jsonArrayString,true);
$obj=json_decode($jsonString);
$lon = (float)$obj->lon;
$lat = (float)$obj->lat;
$distance=(float)$obj->distance;
if($lat==null||$lat==0){
$lat=39.990132;
$lon=116.332224;
$distance=100000;

}

////将cell表中与点（lat,lon）距离小于distance的点打包回来

$con = mysql_connect("localhost","root",null);
if (!$con) {
die('Could not connect:'.mysql_error() );
}

mysql_select_db("a0722152915", $con);
mysql_query("set names 'utf8'");
$sqlfind = "select * from `wifi`";
$resultFind = mysql_query($sqlfind, $con);
$length=mysql_num_rows($resultFind);

$arr=array();
$j=0;
for($i=0;$i<$length;$i++)
{
$row = mysql_fetch_array($resultFind);

$arr[$j]['id'] = $row['id'];
$arr[$j]['mac_address']=$row['mac_address'];
$arr[$j]['wifi_name']=$row['wifi_name'];
$arr[$j]['lat']=$row['gps_lat'];
$arr[$j]['lon']=$row['gps_lon'];
$arr[$j]['location_name']=$row['location_name'];
$arr[$j]['wifi_adds']=$row['wifi_adds'];
$arr[$j]['area']=$row['area'];
$arr[$j]['location_type']=$row['location_type'];
$arr[$j]['ap_free']=$row['ap_free'];
$arr[$j]['category']=$row['category'];
$arr[$j]['password']=$row['password'];
$arr[$j]['capabilities']=$row['capabilities'];
$arr[$j]['user_score']=$row['user_score'];
$arr[$j]['NW_score']=$row['NW_score'];

$j++;

}

//print_r($arr);\
echo  json_encode($arr);

?>

还有一点需要注意，就是如果你的终端上的操作系统是android4.0以上的，要添加上那一段代码，上一篇有写，这里略过

如此一来，可以从MySql中成功地将数据读取下来