我正在尝试使用Php和MSSQL在Android应用程序中构建登录页面。不幸的是，当我尝试登录时，出现错误： org.jso.JSONException值类型。java.lang.string无法转换为jsonobject
这是我的Login2.php代码：
<?php
$response = array();
include 'connect.php';
//Get the input request parameters
$inputJSON = file_get_contents('php://input');
$input = json_decode($inputJSON, TRUE); //convert JSON into array
//Check for Mandatory parameters
if(isset($input['etLoginUsername']) && isset($input['etLoginPassword'])){
$username = $input['etLoginUsername'];
$password = $input['etLoginPassword'];
$query = "SELECT * FROM TestingUser WHERE PF_No = ?";
if($stmt = $conn ->prepare($query)){
$stmt->bind_param("s",$username);
$stmt->execute();
$stmt->bind_result($PF_No,$Name);
if($stmt->fetch()){
$response["status"] = 0;
$response["message"] = "Login successful";
$response["Name"] = $Name;
$response["PF_No"] = $PF_No;
}
else{
$response["status"] = 1;
$response["message"] = "Invalid username and password combination";
}
$stmt->close();
}
}
else{
$response["status"] = 2;
$response["message"] = "Missing mandatory parameters";
}
//Display the JSON response
echo json_encode($response);
?>
SessionHandler.java：
package com.example.androidtransformer;
import android.content.Context;
import android.content.SharedPreferences;
import java.util.Date;
/**
* Created by Abhi on 20 Jan 2018 020.
*/
public class SessionHandler {
private static final String PREF_NAME = "UserSession";
private static final String KEY_USERNAME = "username";
private static final String KEY_EXPIRES = "expires";
private static final String KEY_FULL_NAME = "full_name";
private static final String KEY_EMPTY = "";
private Context mContext;
private SharedPreferences.Editor mEditor;
private SharedPreferences mPreferences;
public SessionHandler(Context mContext) {
this.mContext = mContext;
mPreferences = mContext.getSharedPreferences(PREF_NAME, Context.MODE_PRIVATE);
this.mEditor = mPreferences.edit();
}
/**
* Logs in the user by saving user details and setting session
*
* @param username
* @param fullName
*/
public void loginUser(String username, String fullName) {
mEditor.putString(KEY_USERNAME, username);
mEditor.putString(KEY_FULL_NAME, fullName);
Date date = new Date();
//Set user session for next 7 days
long millis = date.getTime() + (7 * 24 * 60 * 60 * 1000);
mEditor.putLong(KEY_EXPIRES, millis);
mEditor.commit();
}
/**
* Checks whether user is logged in
*
* @return
*/
public boolean isLoggedIn() {
Date currentDate = new Date();
long millis = mPreferences.getLong(KEY_EXPIRES, 0);
/* If shared preferences does not have a value
then user is not logged in
*/
if (millis == 0) {
return false;
}
Date expiryDate = new Date(millis);
/* Check if session is expired by comparing
current date and Session expiry date
*/
return currentDate.before(expiryDate);
}
/**
* Fetches and returns user details
*
* @return user details
*/
public User getUserDetails() {
//Check if user is logged in first
if (!isLoggedIn()) {
return null;
}
User user = new User();
user.setUsername(mPreferences.getString(KEY_USERNAME, KEY_EMPTY));
user.setFullName(mPreferences.getString(KEY_FULL_NAME, KEY_EMPTY));
user.setSessionExpiryDate(new Date(mPreferences.getLong(KEY_EXPIRES, 0)));
return user;
}
/**
* Logs out user by clearing the session
*/
public void logoutUser(){
mEditor.clear();
mEditor.commit();
}
}
MySingleton.java（用于截击请求）
package com.example.androidtransformer;
import android.content.Context;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.toolbox.Volley;
/**
* Created by Abhi on 20 Jan 2018 020.
*/
public class MySingleton {
private static MySingleton mInstance;
private RequestQueue mRequestQueue;
private static Context mCtx;
private MySingleton(Context context) {
mCtx = context;
mRequestQueue = getRequestQueue();
}
public static synchronized MySingleton getInstance(Context context) {
if (mInstance == null) {
mInstance = new MySingleton(context);
}
return mInstance;
}
private RequestQueue getRequestQueue() {
if (mRequestQueue == null) {
// getApplicationContext() is key, it keeps you from leaking the
// Activity or BroadcastReceiver if someone passes one in.
mRequestQueue = Volley.newRequestQueue(mCtx.getApplicationContext());
}
return mRequestQueue;
}
public <T> void addToRequestQueue(Request<T> req) {
getRequestQueue().add(req);
}
}
Login.java
package com.example.androidtransformer;
import android.content.Context;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.toolbox.Volley;
/**
* Created by Abhi on 20 Jan 2018 020.
*/
public class MySingleton {
private static MySingleton mInstance;
private RequestQueue mRequestQueue;
private static Context mCtx;
private MySingleton(Context context) {
mCtx = context;
mRequestQueue = getRequestQueue();
}
public static synchronized MySingleton getInstance(Context context) {
if (mInstance == null) {
mInstance = new MySingleton(context);
}
return mInstance;
}
private RequestQueue getRequestQueue() {
if (mRequestQueue == null) {
// getApplicationContext() is key, it keeps you from leaking the
// Activity or BroadcastReceiver if someone passes one in.
mRequestQueue = Volley.newRequestQueue(mCtx.getApplicationContext());
}
return mRequestQueue;
}
public <T> void addToRequestQueue(Request<T> req) {
getRequestQueue().add(req);
}
}
activity_login.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#304769"
android:gravity="center_vertical"
android:orientation="vertical"
android:padding="50dp"
tools:context=".Login">
<ImageView
android:id="@+id/imageView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="20dp"
android:src="@drawable/ic_lock_outline_white" />
<EditText
android:id="@+id/etLoginUsername"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:background="@android:color/white"
android:hint="@string/username"
android:inputType="textPersonName"
android:padding="10dp" />
<EditText
android:id="@+id/etLoginPassword"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:background="@android:color/white"
android:hint="@string/password"
android:inputType="textPassword"
android:padding="10dp" />
<Button
android:id="@+id/btnLogin"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:background="#f05924"
android:text="@string/sign_in"
android:textColor="@android:color/white" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_marginTop="20dp"
android:text="@string/not_having_account"
android:textColor="#ccc" />
<Button
android:id="@+id/btnLoginRegister"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:background="#aaa"
android:text="@string/register"
android:textColor="@android:color/white" />
</LinearLayout>