本文实例讲述了Android通过json向MySQL中写入数据的方法。，具体如下：

先说一下如何通过json将Android程序中的数据上传到MySQL中：

首先定义一个类JSONParser.Java类，将json上传数据的方法封装好，可以直接在主程序中调用该类，代码如下

public class JSONParser {

static InputStream is = null;

static JSONObject jObj = null;

static String json = "";

// constructor

public JSONParser() {

}

// function get json from url

// by making HTTP POST

public JSONObject makeHttpRequest(String url, String method,

List params) {

// Making HTTP request

try {

// request method is POST

// defaultHttpClient

DefaultHttpClient httpClient = new DefaultHttpClient();

HttpPost httpPost = new HttpPost(url);

httpPost.setEntity(new UrlEncodedFormEntity(params,HTTP.UTF_8));

HttpResponse httpResponse = httpClient.execute(httpPost);

HttpEntity httpEntity = httpResponse.getEntity();

is = httpEntity.getContent();

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

} catch (ClientProtocolException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

try {

BufferedReader reader = new BufferedReader(new InputStreamReader(

is, "UTF-8"));

StringBuilder sb = new StringBuilder();

String line = null;

while ((line = reader.readLine()) != null) {

sb.append(line + "n");

}

is.close();

json = sb.toString();

} catch (Exception e) {

Log.e("Buffer Error", "Error converting result " + e.toString());

Log.d("json", json.toString());

}

// try parse the string to a JSON object

try {

jObj = new JSONObject(json);

} catch (JSONException e) {

Log.e("JSON Parser", "Error parsing data " + e.toString());

}

// return JSON String

return jObj;

}

}

主程序中这样调用：

params = new ArrayList();

//这里可以替换成你自己程序中的一些键值对

params.add(new BasicNameValuePair("time", ""+time));

params.add(new BasicNameValuePair("lat", ""+lat));

params.add(new BasicNameValuePair("lon", ""+lon));

params.add(new BasicNameValuePair("encyptiontype",encyptiontype));

params.add(new BasicNameValuePair("rssi",rssi));

params.add(new BasicNameValuePair("name",name));

JSONParser jsonParser = new JSONParser();

//数据的php文件的路径

String url_up = "******/文件名字.php";

try{

JSONObject json = jsonParser.makeHttpRequest(url_up,"POST", params);

Log.v("uploadsucceed", "uploadsucceed");

}catch(Exception e){

e.printStackTrace();

}

最后就是定义一个接收数据的php文件：

// array for JSON response

//此处需要将数据库名和表明还有密码做相应修改，改成你自己的

$con = mysql_connect("localhost","root",null);

if (!$con) {

die('Could not connect:'.mysql_error() );

}

mysql_select_db("a0722152915", $con);

$response = array();

include("conn.php");

// check for required fields

if (isset($_POST['time']) && isset($_POST['lat']) && isset($_POST['lon'])&& isset($_POST['encyptiontype'])&& isset($_POST['rssi'])&& isset($_POST['name'])) {

$time = $_POST['time'];

$lat = $_POST['lat'];

$lon = $_POST['lon'];

$encyptiontype = $_POST['encyptiontype'];

$rssi = $_POST['rssi'];

$name = $_POST['name'];

$result = mysql_query("INSERT INTO wifi_state(time, lat, lon,encyptiontype,rssi,name) VALUES('$time', '$lat', '$lon','$encyptiontype','$rssi','$name')");

echo $result;

// check if row inserted or not

if ($result) {

// successfully inserted into database

$response["success"] = 1;

$response["message"] = "Product successfully created.";

// echoing JSON response

echo json_encode($response);

} else {

// failed to insert row

$response["success"] = 0;

$response["message"] = "Oops! An error occurred.";

// echoing JSON response

echo json_encode($response);

}

} else {

// required field is missing

$response["success"] = 0;

$response["message"] = "Required field(s) is missing";

// echoing JSON response

echo json_encode($response);

}

?>