我正在尝试登录应用程序,但我一直遇到“解析数据org.json.JSONException错误:在字符0的输入结束”
我的登录名。java看起来像这样
公共类登录扩展活动实现OnClickListener{私有EditText用户,pass;
private Button mSubmit, mRegister;
// Progress Dialog
private ProgressDialog pDialog;
// JSON parser class
JSONParser jsonParser = new JSONParser();
//php login script location:
//localhost :
//testing on your device
//put your local ip instead, on windows, run CMD > ipconfig
//or in mac's terminal type ifconfig and look for the ip under en0 or en1
//testing on Emulator:
私有静态最终字符串LOGIN_URL="my url";
//从真实服务器进行测试:
//JSON element ids from repsonse of php script:
private static final String TAG_SUCCESS = "success";
private static final String TAG_MESSAGE = "message";
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
//setup input fields
user = (EditText)findViewById(R.id.username);
pass = (EditText)findViewById(R.id.password);
//setup buttons
mSubmit = (Button)findViewById(R.id.button1);
mRegister = (Button)findViewById(R.id.button2);
//register listeners
mSubmit.setOnClickListener(this);
mRegister.setOnClickListener(this);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.button1:
new AttemptLogin().execute();
break;
case R.id.button2:
Intent i = new Intent(this, Register.class);
startActivity(i);
break;
default:
break;
}
}
class AttemptLogin extends AsyncTask<String, String, String> {
/**
* */
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) {
/** String username = user.getText().toString();
String password = pass.getText().toString();**/
String username,password;
username = user.getText().toString();
password = pass.getText().toString();
// TODO Auto-generated method stub
// Check for success tag
int success;
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("username", username));
params.add(new BasicNameValuePair("password", password));
Log.d("request!", "starting");
// getting product details by making HTTP request
JSONObject json = jsonParser.makeHttpRequest(LOGIN_URL, "POST", params);
// check your log for json response
Log.d("Login attempt", json.toString());
// json success tag
success = json.getInt(TAG_SUCCESS);
if (success == 1) {
Log.d("Login Successful!", json.toString());
Intent i = new Intent(Login.this, ReadComments.class);
finish();
startActivity(i);
return json.getString(TAG_MESSAGE);
}else{
Log.d("Login Failure!", json.getString(TAG_MESSAGE));
return json.getString(TAG_MESSAGE);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once product deleted
pDialog.dismiss();
if (file_url != null){
Toast.makeText(Login.this, file_url, Toast.LENGTH_LONG).show();
}
}
}
}
我的JSONParser。java如下所示:`
公共类JSONParser{
static InputStream is = null; static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
public JSONObject getJSONFromUrl(String url) {
// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
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, "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;
}
//函数从url获取json
//通过制作HTTP POST或GET mehtod
公共JSONObject makeHttpRequest(字符串url、字符串方法、列表参数){
// Making HTTP request
try {
// check for request method
if(method == "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 == "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();
Log.e("Buffer Error", "ClientProtocolException " + e.toString());
} catch (IOException e) {
e.printStackTrace();
Log.e("Buffer Error", "IOException " + e.toString());
}
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;
}}
我的登录名。php看起来像
//加载并连接到MySQL数据库,需要(“config.inc.php”);
如果(!空($_POST)) { //根据用户名获取用户信息。
$query = "
SELECT
id,username,password
FROM users
WHERE
username = :username
";
$query_params = array(
':username' => $_POST['username']
);
try {
$stmt = $db->prepare($query);
$result = $stmt->execute($query_params);
}
catch (PDOException $ex) {
// For testing, you could use a die and message.
//die("Failed to run query: " . $ex->getMessage());
//or just use this use this one to product JSON data:
$response["success"] = 0;
$response["message"] = "Database Error1. Please Try Again!";
// echo json_encode($response);
// die(json_encode($response));
}
//This will be the variable to determine whether or not the user's information is correct.
//we initialize it as false.
$validated_info = false;
//fetching all the rows from the query
$row = $stmt->fetch();
if ($row) {
//if we encrypted the password, we would unencrypt it here, but in our case we just
//compare the two passwords
if ($_POST['password'] === $row['password']) {
$login_ok = true;
}
}
// If the user logged in successfully, then we send them to the private members-only page
// Otherwise, we display a login failed message and show the login form again
if ($login_ok) {
$response["success"] = 1;
$response["message"] = "Login successful!";
// echo json_encode($response);
// die(json_encode($response));
} else {
$response["success"] = 0;
$response["message"] = "Invalid Credentials!";
// echo json_encode($response);
// die(json_encode($response))
}
die(json\U编码($响应))
}其他{
?
<h1>Login</h1>
<form action="login.php" method="post">
Username:<br />
<input type="text" name="username" placeholder="username" />
<br /><br />
Password:<br />
<input type="password" name="password" placeholder="password" value="" />
<br /><br />
<input type="submit" value="Login" />
</form>
<a href="register.php">Register</a>
<?php
}
?
最后我的日志
'08-21 01:28:53.663:D/请求!(32513):启动
08-21 01:28:54.507:D/dalvikvm(32513):GC\u FOR\u MALLOC freed 134K,47%free 3032K/5639K,外部507K/517K,暂停101ms
08-21 01:29:04.921:E/JSON解析器(32513):错误解析数据组织。json。JSONException:08-21 01:29:04.929的字符0处输入结束:W/dalvikvm(32513):threadid=9:线程以未捕获异常退出(组=0x40018578)
08-21 01:29:04.952:E/AndroidRuntime(32513):致命异常:AsyncTask#1
08-21 01:29:04.952:E/AndroidRuntime(32513):java。lang.RuntimeException:在android上执行doInBackground()时出错。操作系统。异步任务3美元。完成(AsyncTask.java:200)
08-21 01:29:04.952:E/AndroidRuntime(32513):在java。util。同时发生的FutureTask$同步。innerSetException(FutureTask.java:274)
08-21 01:29:04.952:E/AndroidRuntime(32513):java。util。同时发生的未来任务。setException(FutureTask.java:125)
08-21 01:29:04.952:E/AndroidRuntime(32513):java。util。同时发生的FutureTask$同步。innerRun(FutureTask.java:308)
08-21 01:29:04.952:E/AndroidRuntime(32513):java。util。同时发生的未来任务。运行(FutureTask.java:138)
08-21 01:29:04.952:E/AndroidRuntime(32513):在java上运行。util。同时发生的线程池执行器。runWorker(ThreadPoolExecutor.java:1088)
08-21 01:29:04.952:E/AndroidRuntime(32513):在java。util。同时发生的ThreadPoolExecutor$工作者。运行(ThreadPoolExecutor.java:581)
08-21 01:29:04.952:E/AndroidRuntime(32513):在java上运行。lang.Thread。运行(Thread.java:1019)
08-21 01:29:04.952:E/AndroidRuntime(32513):由:java引起。lang.NullPointerException
08-21 01:29:04.952:E/AndroidRuntime(32513):位于com。实例prova1.Login$尝试登录。doInBackground(Login.java:179)08-21 01:29:04.952:E/AndroidRuntime(32513):位于com。实例prova1.Login$尝试登录。doInBackground(Login.java:1)
08-21 01:29:04.952:E/AndroidRuntime(32513):在android上。操作系统。异步任务2美元。调用(AsyncTask.java:185)
08-21 01:29:04.952:E/AndroidRuntime(32513):在java上。util。同时发生的FutureTask$同步。innerRun(FutureTask.java:306)
08-21 01:29:04.952:E/AndroidRuntime(32513):。。。4更多08-21 01:29:12.710:E/WindowManager(32513):活动com。实例验证1。登录名泄漏了窗口com.Android内部的政策实施。电话窗口$DecorView@4054add8最初添加到这里的是08-21 01:29:12.710:E/WindowManager(32513):android。看法WindowLeaked:活动com。实例验证1。登录名泄漏了窗口com.Android内部的政策实施。电话窗口$DecorView@4054add8最初添加到这里的是android上的WindowManager(32513)。看法ViewRoot。(ViewRoot.java:263)
08-21 01:29:12.710:E/WindowManager(32513):在android上。看法WindowManagerImpl。addView(WindowManagerImpl.java:171)
08-21 01:29:12.710:E/WindowManager(32513):在android上。看法WindowManagerImpl。addView(WindowManagerImpl.java:114)
08-21 01:29:12.710:E/WindowManager(32513):在android上。看法窗口$LocalWindowManager。addView(Window.java:424)
08-21 01:29:12.710:E/WindowManager(32513):在android上。应用程序。对话显示(Dialog.java:241)
08-21 01:29:12.710:E/WindowManager(32513):在com上。实例prova1.Login$尝试登录。onPreExecute(Login.java:134)
08-21 01:29:12.710:E/WindowManager(32513):在android上。操作系统。异步任务。在com上执行(AsyncTask.java:391)
08-21 01:29:12.710:E/WindowManager(32513)。实例prova1.Login。onClick(Login.java:97)
08-21 01:29:12.710:E/WindowManager(32513):在android上。看法看法performClick(View.java:2485)
08-21 01:29:12.710:E/WindowManager(32513):在android上。看法查看$PerformClick。在android上运行(View.java:9080)
08-21 01:29:12.710:E/WindowManager(32513)。操作系统。处理程序。handleCallback(Handler.java:587)
08-21 01:29:12.710:E/WindowManager(32513):在android上。操作系统。处理程序。dispatchMessage(Handler.java:92)
08-21 01:29:12.710:E/WindowManager(32513):在android上。操作系统。活套。loop(Looper.java:130)08-21 01:29:12.710:E/WindowManager(32513):在android上。应用程序。ActivityThread。main(ActivityThread.java:3687)
08-21 01:29:12.710:E/WindowManager(32513):位于java。lang.reflect。方法invokenactive(本机方法)
08-21 01:29:12.710:E/WindowManager(32513):java。lang.reflect。方法调用(Method.java:507)
08-21 01:29:12.710:E/WindowManager(32513):在com上。Android内部的操作系统。ZygoteInit$MethodandArgscaler。运行(ZygoteInit.java:867)08-21 01:29:12.710:E/WindowManager(32513):在com上。Android内部的操作系统。合子岩。main(ZygoteInit.java:625)
08-21 01:29:12.710:E/WindowManager(32513):位于dalvik。系统NativeStart。main(本机方法)`
我们将非常感谢您的帮助。。非常感谢。
我看到,在PHP中,您返回一个JSONarray,在代码中,您像JSONobject一样解析它。
首先尝试将其解析为JSONarray,然后获取JSONobect
JSONArray jsonarray = new JSONArray(json);
JSONObject jsonobj = jsonarray.getJSONObject(0);
int x = jsonobj.getInt("success");
以下是所有的错误: 下面是我的代码:
我见过其他人遇到这个问题,但没有一个帖子能够帮助我。我试图在REST调用库中使用Volley,当我试图使用带有JSON对象的Put调用作为参数时,我得到了错误:org。json。JSONException:输入结束于的字符0处。 代码如下: jsonParams日志显示: 有没有其他我错过的场景?看起来请求无法解析JSON对象。我甚至尝试创建一个HashMap,然后用它创建一个JSON对象,但仍然
问题内容: 我正在尝试从服务器获取JSON值。我不知道我的代码有什么问题。我正在使用,这是我的代码在 码: 这是logcat 这是 JSON 格式 问题答案: 您可能会得到一个空白的答复。它不为null,但 jsontext 为空。因此,您将收到此错误,而不是Nullpointer异常 您是否正在向服务器发送正确的参数。还要检查url是否响应POST请求。
问题内容: 解析JSON时出现错误。解析数据org.json.JSONException时出错:输入的第0个字符。 错误日志: 这是在UserFunction类中调用函数的代码: UserFunction类中的函数 Java解析器类: 这是我的index.php API index.php调用此orderdetails函数 新的JSON响应。尽管我必须要生产的产品不能显示阵列。为什么JSON标签显
问题内容: 我已经看到其他人遇到了这个问题,但是没有一个帖子能够帮助我。我正在尝试将Volley用于我的REST调用库,当我尝试将JSON对象作为参数使用Put调用时,我得到了。 这是代码: jsonParams日志显示: 我还有其他设置吗?看来请求无法解析JSON对象。我什至尝试创建一个HashMap,然后使用它创建一个JSON对象,但是我仍然得到相同的结果。 问题答案: 我也遇到了这个问题。
问题内容: 我正在开发一个测试Android应用程序,该应用程序必须显示mysql数据库中的一些数据。这是我的日志: 这里是JSONParser.java类 在这里,我用来显示所选数据的类: 这里的PHP文件: 另外,这里主要活动: 我在互联网上阅读了有关此错误的各种线索,但它甚至是由差异问题引起的,我没有找到与我的情况类似的情况或解决了我问题的解决方案。 问题答案: 看起来您的PHP文件正在返回