我目前正在为我们的论文创建和Android应用程序。当我开始在登录方面遇到问题时，我将完成该应用程序。当我尝试烤面包时，这些字段正在接受输入，但是当我将数据发送到服务器时，请向我发送"字段为空"响应。我被困在这方面，因此任何帮助都将不胜感激。
这是我的JSONPARSER类：
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 or GET mehtod
public JSONObject makeHttpRequest(String url, String method,
List<NameValuePair> params) {
// Making HTTP request
try {
// check for request method
if(method.equals("POST"){
// request method is POST
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(new UrlEncodedFormEntity(params));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} else if (method.equals("GET") {
// request method is GET
DefaultHttpClient httpClient = new DefaultHttpClient();
String paramString = URLEncodedUtils.format(params, "utf-8");
url += "?" + paramString;
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpGet);
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, "iso-8859-1"), 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());
}
// 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;
}
}
这是我的登录外法函数：
class AttemptLogin extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
boolean failure = false;
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(Login.this);
pDialog.setMessage("Attempting login...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected String doInBackground(String... args) {
int success;
String emailaddress = EADD.getText().toString();
String password = PASS.getText().toString();
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("mem_email", emailaddress));
params.add(new BasicNameValuePair("mem_password", password));
Log.d("request!", "starting");
JSONObject json = jsonParser.makeHttpRequest("http://builtcycles.com/built_mobile/login.php", "POST", params);
// check your log for json response
Log.d("Login attempt", json.toString());
// json success tag
try{
success = json.getInt("success");
if (success == 1) {
String memberId = json.getString("id");
String memberName = json.getString("uid");
Log.d("Login Successful!", json.toString());
pDialog.dismiss();
intent = new Intent(Login.this, MainActivity.class);
intent.putExtra("id", memberId);
intent.putExtra("uid", memberName);
startActivity(intent);
finish();
return json.getString("message");
} else {
Log.d("Login Failure!", json.getString("message"));
return json.getString("message");
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
@Override
protected void onPostExecute(String file_url) {
pDialog.dismiss();
if (file_url != null) {
Toast.makeText(Login.this, file_url, Toast.LENGTH_SHORT).show();
}
}
}
这是我的登录php：
<?php
$response = array();
if (!empty($_POST)) {
$email= $_POST['mem_email'];
// include db connect class
require_once __DIR__ . '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// mysql inserting a new row
$result = mysql_query("SELECT * from tblmembers where mem_email='$email'");
if (mysql_num_rows($result) > 0) {
while ($row = mysql_fetch_array($result)) {
$response["id"] = $row["mem_id"];
$response["uid"] = $row["mem_fname"];
if ($row["mem_active"]==1) {
if (md5($_POST['mem_password'])===$row['mem_password']) {
$response["success"] = 1;
$response["message"] = "Login successfully!";
echo json_encode($response);
} else {
$response["success"] = 0;
$response["message"] = "Invalid email or password";
echo json_encode($response);
}
} else {
$response["success"] = 3;
$response["message"] = "Check your email for verification! Thanks.";
echo json_encode($response);
}
}
} else {
// no products found
$response["success"] = 4;
$response["message"] = "No user found";
// echo no users JSON
echo json_encode($response);
}
} else {
$response["success"] = 4;
$response["message"] = "Fields are empty.";
// echo no users JSON
echo json_encode($response);
}
?>
我已经更改了方法==" post"/" get"到method.equals（" post"）中。不过，我无法将数据发送到服务器。问题来自JSONPARSER类还是在异步的Doinbackground（）中？
更改
中的字符串比较语句makeHttpRequest()
来自
// check for request method
if(method == "POST"){
...
} else if (method == "GET") {
to
// check for request method
if(method.equals("POST")){
...
} else if (method.equals("GET")) {