JSON解析和AsyncTask错误
问题描述：
我想做一个注册和登录功能，但有JSON和AsyncTask的问题。这是logcat错误。JSON解析和AsyncTask错误
02-06 04:18:08.857: E/JSON(1160): <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN""http://www.w3.org/TR/html4/strict.dtd">n<HTML><HEAD><TITLE>Not Found</TITLE>n<META HTTP-EQUIV="Content-Type" Content="text/html; charset=us-ascii"></HEAD>n<BODY><h2>Not Found</h2>n<hr><p>HTTP Error 404. The requested resource is not found.</p>n</BODY></HTML>n
02-06 04:18:08.857: E/JSON Parser(1160): Error parsing data org.json.JSONException: Value <!DOCTYPE of type java.lang.String cannot be converted to JSONObject
02-06 04:18:08.887: W/dalvikvm(1160): threadid=11: thread exiting with uncaught exception (group=0x41465700)
02-06 04:18:08.937: E/AndroidRuntime(1160): FATAL EXCEPTION: AsyncTask #1
02-06 04:18:08.937: E/AndroidRuntime(1160): java.lang.RuntimeException: An error occured while executing doInBackground()
02-06 04:18:08.937: E/AndroidRuntime(1160): at android.os.AsyncTask$3.done(AsyncTask.java:299)
02-06 04:18:08.937: E/AndroidRuntime(1160): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
02-06 04:18:08.937: E/AndroidRuntime(1160): at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
02-06 04:18:08.937: E/AndroidRuntime(1160): at java.util.concurrent.FutureTask.run(FutureTask.java:239)
02-06 04:18:08.937: E/AndroidRuntime(1160): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
02-06 04:18:08.937: E/AndroidRuntime(1160): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
02-06 04:18:08.937: E/AndroidRuntime(1160): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
02-06 04:18:08.937: E/AndroidRuntime(1160): at java.lang.Thread.run(Thread.java:841)
02-06 04:18:08.937: E/AndroidRuntime(1160): Caused by: java.lang.NullPointerException
02-06 04:18:08.937: E/AndroidRuntime(1160): at my.fyp.inticlassifieds.RegisterTask.doInBackground(RegisterTask.java:76)
02-06 04:18:08.937: E/AndroidRuntime(1160): at my.fyp.inticlassifieds.RegisterTask.doInBackground(RegisterTask.java:1)
02-06 04:18:08.937: E/AndroidRuntime(1160): at android.os.AsyncTask$2.call(AsyncTask.java:287)
02-06 04:18:08.937: E/AndroidRuntime(1160): at java.util.concurrent.FutureTask.run(FutureTask.java:234)
02-06 04:18:08.937: E/AndroidRuntime(1160): ... 4 more
这是用的AsyncTask类使用：
public class RegisterTask extends AsyncTask<String, Void, Integer> {
private ProgressDialog progressDialog;
private RegisterActivity activity;
private int id = -1;
private JSONParser jsonParser;
private static String loginURL = "http://10.2.2.0/project/index.php";
private static String registerURL = "http://10.2.2.0/project/index.php";
private static String KEY_SUCCESS = "success";
private static String KEY_ERROR = "error";
private static String KEY_ERROR_MSG = "error_msg";
private static String KEY_UID = "uid";
private static String KEY_NAME = "name";
private static String KEY_EMAIL = "email";
private static String KEY_CREATED_AT = "created_at";
private int responseCode = 0;
public RegisterTask(RegisterActivity activity, ProgressDialog progressDialog) {
this.activity = activity;
this.progressDialog = progressDialog;
}
@Override
protected void onPreExecute() {
progressDialog.show();
progressDialog.dismiss();
}
@Override
protected Integer doInBackground(String... arg0) {
EditText userName = (EditText) activity
.findViewById(R.id.registerEmail);
EditText passwordEdit = (EditText) activity
.findViewById(R.id.registerPassword);
EditText userContact = (EditText) activity
.findViewById(R.id.registerContact);
String contact = userContact.getText().toString();
String email = userName.getText().toString();
String password = passwordEdit.getText().toString();
Log.v(email, password);
UserFunctions userFunction = new UserFunctions();
JSONObject json = userFunction.registerUser(email, password, contact);
// check for login response
try {
if (json.getString(KEY_SUCCESS) != null) {
// registerErrorMsg.setText("");
String res = json.getString(KEY_SUCCESS);
if (Integer.parseInt(res) == 1) {
// user successfully registred
// Store user details in SQLite Database
DatabaseHandler db = new DatabaseHandler(
activity.getApplicationContext());
JSONObject json_user = json.getJSONObject("user");
// Clear all previous data in database
userFunction.logoutUser(activity.getApplicationContext());
db.addUser(json_user.getString(KEY_EMAIL),
json.getString(KEY_UID),
json_user.getString(KEY_CREATED_AT));
// successful registration
responseCode = 1;
} else {
// Error in registration
responseCode = 0;
}
}
} catch (JSONException e) {
e.printStackTrace();
}
return responseCode;
}
@Override
protected void onPostExecute(Integer responseCode) {
EditText userName = (EditText) activity
.findViewById(R.id.registerEmail);
EditText passwordEdit = (EditText) activity
.findViewById(R.id.registerPassword);
String s = userName.getText().toString();
if (responseCode == 1) {
progressDialog.dismiss();
activity.registerReport(responseCode);
userName.setText("");
passwordEdit.setText("");
}
if (responseCode == 0) {
progressDialog.dismiss();
activity.registerReport(responseCode);
}
}
}
或可能的误差可能是从PHP本身？
<?php
/**
* File to handle all API requests
* Accepts GET and POST
*
* Each request will be identified by TAG
* Response will be JSON data
/**
* check for POST request
*/
if (isset($_POST['tag']) && $_POST['tag'] != '') {
// get tag
$tag = $_POST['tag'];
// include db handler
require_once 'include/DB_Functions.php';
$db = new DB_Functions();
// response Array
$response = array("tag" => $tag, "success" => 0, "error" => 0);
// check for tag type
if ($tag == 'login') {
// Request type is check Login
$email = $_POST['email'];
$password = $_POST['password'];
// check for user
$user = $db->getUserByEmailAndPassword($email, $password);
if ($user != false) {
// user found
// echo json with success = 1
$response["success"] = 1;
$response["user"]["email"] = $user["email"];
$response["user"]["contact"] = $user["contact_no"];
$response["user"]["created_at"] = $user["year_joined"];
echo json_encode($response);
} else {
// user not found
// echo json with error = 1
$response["error"] = 1;
$response["error_msg"] = "Incorrect email or password!";
echo json_encode($response);
}
} else if ($tag == 'register') {
// Request type is Register new user
$email = $_POST['email'];
$password = $_POST['password'];
$contact = $_POST['contact'];
// check if user is already existed
if ($db->isUserExisted($email)) {
// user is already existed - error response
$response["error"] = 2;
$response["error_msg"] = "User already existed";
echo json_encode($response);
} else {
// store user
$user = $db->storeUser($email, $contact_no, $password);
if ($user) {
// user stored successfully
$response["success"] = 1;
$response["user"]["email"] = $user["email"];
$response["user"]["contact"] = $user["contact_no"];
$response["user"]["created_at"] = $user["year_joined"];
echo json_encode($response);
} else {
// user failed to store
$response["error"] = 1;
$response["error_msg"] = "Error occured in Registartion";
echo json_encode($response);
}
}
} else {
echo "Invalid Request";
}
} else {
echo "Access Denied";
}
?>
更改链接，现在我有这个错误。
02-06 09:45:18.168: E/JSON(1697): <br />n<font size='1'><table class='xdebug-error' dir='ltr' border='1' cellspacing='0' cellpadding='1'>n<tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>(!)</span> Warning: require_once(include/DB_Functions.php) [<a href='function.require-once'>function.require-once</a>]: failed to open stream: No such file or directory in D:\Softwares\wamp\www\project\index.php on line <i>17</i></th></tr>n<tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>n<tr><th align='center' bgcolor='#eeeeec'>#</th><th align='left' bgcolor='#eeeeec'>Time</th><th align='left' bgcolor='#eeeeec'>Memory</th><th align='left' bgcolor='#eeeeec'>Function</th><th align='left' bgcolor='#eeeeec'>Location</th></tr>n<tr><td bgcolor='#eeeeec' align='center'>1</td><td bgcolor='#eeeeec' align='center'>0.0009</td><td bgcolor='#eeeeec' align='right'>692600</td><td bgcolor='#eeeeec'>{main}()</td><td title='D:\Softwares\wamp\www\project\index.php' bgcolor='#eeeeec'>..\index.php<b>:</b>0</td></tr>n</table></font>n<br />n<font size='1'><table class='xdebug-error' dir='ltr' border='1' cellspacing='0' cellpadding='1'>n<tr><th align='left' bgcolor='#f57900' colspan="5"><span style='background-color: #cc0000; color: #fce94f; font-size: x-large;'>(!)</span> Fatal error: require_once() [<a href='function.require'>function.require</a>]: Failed opening required 'include/DB_Functions.php' (include_path='.;C:\php\pear') in D:\Softwares\wamp\www\project\index.php on line <i>17</i></th></tr>n<tr><th align='left' bgcolor='#e9b96e' colspan='5'>Call Stack</th></tr>n<tr><th align='center' bgcolor='#eeeeec'>#</th><th align='left' bgcolor='#eeeeec'>Time</th><th align='left' bgcolor='#eeeeec'>Memory</th><th align='left' bgcolor='#eeeeec'>Function</th><th align='left' bgcolor='#eeeeec'>Location</th></tr>n<tr><td bgcolor='#eeeeec' align='center'>1</td><td bgcolor='#eeeeec' align='center'>0.0009</td><td bgcolor='#eeeeec' align='right'>692600</td><td bgcolor='#eeeeec'>{main}()</td><td title='D:\Softwares\wamp\www\project\index.php' bgcolor='#eeeeec'>..\index.php<b>:</b>0</td></tr>n</table></font>n
答
你指向一个错误的URL：404 - 未找到，
这是你试图解析什么：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN""http://www.w3.org/TR/html4/strict.dtd">n<HTML><HEAD><TITLE>Not Found</TITLE>n<META HTTP-EQUIV="Content-Type" Content="text/html; charset=us-ascii"></HEAD>n<BODY><h2>Not Found</h2>n<hr><p>HTTP Error 404. The requested resource is not found.</p>n</BODY></HTML>
正如你所看到的不是一个JSON ，而是一个HTML页面。直接从浏览器测试指向它的网址。你应该看到一个JSON格式的字符串。
答
使用错误的网址。您正在获取404错误页面作为响应，并且您试图将html解析为JSON。
答
价值！DOCTYPE”检查您的网址和servlet或防火墙CFG
你有NPE在RegisterTask.java:76 ..这行是什么？ –
@ M.Sameer如果（json.getString（KEY_SUCCESS）！ = null） – Benz