Java 如何从android到PHP获取JSON数组
我在另一篇文章中看到了下面的代码并使用了它 这段代码获取Android SQLite数据库中的所有行，并将其转换为JSON数组。我想使用PHP获取JSON数组，将其存储到我的在线数据库中 我该怎么办 这是我使用的代码：Java 如何从android到PHP获取JSON数组,java,android,json,Java,Android,Json,我在另一篇文章中看到了下面的代码并使用了它 这段代码获取Android SQLite数据库中的所有行，并将其转换为JSON数组。我想使用PHP获取JSON数组，将其存储到我的在线数据库中 我该怎么办 这是我使用的代码： private JSONArray getResults() { String myPath = this.getDatabasePath("cart.db").toString();// Set path to your database String my
private JSONArray getResults()
{
String myPath = this.getDatabasePath("cart.db").toString();// Set path to your database
String myTable = CartContract.CartEntry.TABLE_NAME;//Set name of your table
SQLiteDatabase myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
String searchQuery = "SELECT * FROM " + myTable;
Cursor cursor = myDataBase.rawQuery(searchQuery, null );
JSONArray resultSet = new JSONArray();
cursor.moveToFirst();
while (cursor.isAfterLast() == false) {
int totalColumn = cursor.getColumnCount();
JSONObject rowObject = new JSONObject();
for( int i=0 ; i< totalColumn ; i++ )
{
if( cursor.getColumnName(i) != null )
{
try
{
if( cursor.getString(i) != null )
{
Log.d("TAG_NAME", cursor.getString(i) );
rowObject.put(cursor.getColumnName(i) , cursor.getString(i) );
}
else
{
rowObject.put( cursor.getColumnName(i) , "" );
}
}
catch( Exception e )
{
Log.d("TAG_NAME", e.getMessage() );
}
}
}
resultSet.put(rowObject);
cursor.moveToNext();
}
cursor.close();
Log.d("FINAL RESULT", resultSet.toString() );
return resultSet;
}
更新：我使用了@Christopher Robin Fey Feysenbe的一些代码，它成功了！非常感谢您您可能需要使用此功能
package com.your.app.name;
import android.content.Context;
import android.util.Log;
import android.widget.Toast;
import com.android.volley.NetworkError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.TimeoutError;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import java.util.Iterator;
import java.util.Map;
/**
* Helper Class to handle Network Requests
* with Volley
*/
public class Network {
private static Network network;
private RequestQueue mRequestQueue;
private static Context mCtx;
public final String TAG = "Network Helper";
/**
* Constructor
*/
private Network(Context c) {
mCtx = c;
mRequestQueue = getRequestQueue();
}
public interface INetworkCallback {
void NetworkSuccess(String response);
void NetworkError(String error);
}
public static synchronized Network getInstance(Context c) {
if (network == null) {
network = new Network(c);
}
return network;
}
public RequestQueue getRequestQueue() {
if (mRequestQueue == null) {
mRequestQueue = Volley.newRequestQueue(mCtx.getApplicationContext());
}
return mRequestQueue;
}
/**
* Perform a POST Request to a specified url;
*
* @param host
* @param url
* @param params
* @param callback new INetworkCallback()
*/
public void postRequest(final String host, final String url, final Map params, final INetworkCallback callback) {
try {
StringRequest postRequest = new StringRequest(Request.Method.POST, (host + url),
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.v(TAG, response);
//make successCallback
callback.NetworkSuccess(response);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
if (error instanceof NetworkError) {
//no response from compound URL
callback.NetworkError(error.toString());
Toast.makeText(mCtx, "No internet connection", Toast.LENGTH_LONG).show();
} else if (error.networkResponse != null && error.networkResponse.statusCode == 500 ||
error.networkResponse != null && error.networkResponse.statusCode == 301) {
//Show errorMessage and log Error
callback.NetworkError(error.networkResponse.headers.get("message"));
String mess = error.networkResponse.headers.get("message");
if (mess != null && !mess.isEmpty()) {
Toast.makeText(mCtx, error.networkResponse.headers.get("message"), Toast.LENGTH_LONG).show();
}
} else {
//some unexpected Error occurred
callback.NetworkError("Network Error: " + error.toString());
}
}
}) {
@Override
protected Map<String, String> getParams() {
return params;
}
};
//add request to queue
addToRequestQueue(postRequest);
} catch (Exception e) {
callback.NetworkError("Error performing Request: - " + e.toString());
}
}
public void getRequest(final String host, final String url, final Map params, final INetworkCallback callback) {
String paramsString = makeGetURL(params);
Log.v(TAG, "======= " + paramsString + " =======");
try {
StringRequest getRequest = new StringRequest(Request.Method.GET, (host + url + paramsString),
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.v(TAG, response);
//make successCallback
callback.NetworkSuccess(response);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
if (error instanceof NetworkError) {
//no response from compound URL
callback.NetworkError(error.toString());
Toast.makeText(mCtx, "No internet connection", Toast.LENGTH_LONG).show();
} else if (error instanceof TimeoutError) {
//no response from compound URL
callback.NetworkError(error.toString());
Toast.makeText(mCtx, "No server connection", Toast.LENGTH_LONG).show();
} else if (error.networkResponse != null && error.networkResponse.statusCode == 500) {
//Show errorMessage and log Error
callback.NetworkError(error.networkResponse.headers.get("message"));
String mess = error.networkResponse.headers.get("message");
if (mess != null && !mess.isEmpty()) {
Toast.makeText(mCtx, error.networkResponse.headers.get("message"), Toast.LENGTH_LONG).show();
}
} else {
//some unexpected Error occurred
callback.NetworkError("NetworkError: " + error.toString());
}
}
});
//add request to queue
addToRequestQueue(getRequest);
} catch (Exception e) {
callback.NetworkError("Error performing request: " + e.toString());
}
}
/**
* Iterates over all Set entries of HashMap and
* generates a GET URL Link base on the key, value pairs
*
* @param params
* @return
*/
private String makeGetURL(Map params) {
String qm;
String url = "";
if (params != null) {
qm = (params.size() > 0) ? "?" : "";
//add ? if there ara parameters
url += qm;
Iterator it = params.entrySet().iterator();
while (it.hasNext()) {
Map.Entry param = (Map.Entry) it.next();
url += param.getKey() + "=" + param.getValue() + "&";
}
//erase last char
try {
url = url.substring(0, url.length() - 1);
} catch (Exception e) {
//IF FAILS it means no parameters have been putted
Log.i(TAG, "no parameters found for get request");
}
}
return url;
}
public <T> void addToRequestQueue(Request<T> req) {
getRequestQueue().add(req);
}
}
package com.your.app.name；
导入android.content.Context；
导入android.util.Log；
导入android.widget.Toast；
导入com.android.volley.NetworkError；
导入com.android.volley.Request；
导入com.android.volley.RequestQueue；
导入com.android.volley.Response；
导入com.android.volley.TimeoutError；
导入com.android.volley.VolleyError；
导入com.android.volley.toolbox.StringRequest；
导入com.android.volley.toolbox.volley；
导入org.json.JSONArray；
导入org.json.JSONException；
导入java.util.Iterator；
导入java.util.Map；
/**
*帮助器类来处理网络请求
*凌空抽射
*/
公共班级网络{
专用静态网络；
私有请求队列mRequestQueue；
私有静态上下文mCtx；
public final String TAG=“Network Helper”；
/**
*建造师
*/
专用网络（上下文c）{
mCtx=c；
mRequestQueue=getRequestQueue（）；
}
公共接口INetworkCallback{
void NetworkSuccess（字符串响应）；
无效网络错误（字符串错误）；
}
公共静态同步网络getInstance（上下文c）{
if（网络==null）{
网络=新网络（c）；
}
返回网络；
}
公共请求队列getRequestQueue（）{
if（mRequestQueue==null）{
mRequestQueue=Volley.newRequestQueue（mCtx.getApplicationContext（））；
}
返回mrequest队列；
}
/**
*对指定的url执行POST请求；
*
*@param主机
*@param-url
*@param params
*@param callback new INetworkCallback（）
*/
公共void postRequest（最终字符串主机、最终字符串url、最终映射参数、最终INetworkCallback）{
试一试{
StringRequest postRequest=新的StringRequest（Request.Method.POST，（主机+url），
新的Response.Listener（）{
@凌驾
公共void onResponse（字符串响应）{
Log.v（标签、响应）；
//使成功回调
callback.NetworkSuccess（响应）；
}
}，new Response.ErrorListener（）{
@凌驾
公共无效onErrorResponse（截击错误）{
if（网络错误实例错误）{
//没有来自复合URL的响应
callback.NetworkError（error.toString（））；
Toast.makeText（mCtx，“无互联网连接”，Toast.LENGTH_LONG.show（）；
}else if（error.networkResponse！=null&&error.networkResponse.statusCode==500||
error.networkResponse！=null&&error.networkResponse.statusCode==301）{
//显示错误消息和日志错误
NetworkError（error.networkResponse.headers.get（“message”）；
字符串mess=error.networkResponse.headers.get（“消息”）；
if（mess！=null&&！mess.isEmpty（））{
Toast.makeText（mCtx，error.networkResponse.headers.get（“message”），Toast.LENGTH\u LONG.show（）；
}
}否则{
//发生了一些意外错误
callback.NetworkError（“网络错误：+Error.toString（））；
}
}
}) {
@凌驾
受保护的映射getParams（）{
返回参数；
}
};
//将请求添加到队列
addToRequestQueue（postRequest）；
}捕获（例外e）{
NetworkError（“执行请求时出错：-“+e.toString（））；
}
}
public void getRequest（最终字符串主机、最终字符串url、最终映射参数、最终INetworkCallback）{
字符串paramsString=makeGetURL（params）；
Log.v（标记“==”+paramsString+”==”；
试一试{
StringRequest getRequest=新的StringRequest（Request.Method.GET，（host+url+paramsString），
新的Response.Listener（）{
@凌驾
公共void onResponse（字符串响应）{
Log.v（标签、响应）；
//使成功回调
callback.NetworkSuccess（响应）；
}
}，new Response.ErrorListener（）{
@凌驾
公共无效onErrorResponse（截击错误）{
if（网络错误实例错误）{
//没有来自复合URL的响应
callback.NetworkError（error.toString（））；
Toast.makeText（mCtx，“无互联网连接”，Toast.LENGTH_LONG.show（）；
}else if（TimeoutError的错误实例）{
//没有来自复合URL的响应
callback.NetworkError（error.toString（））；
Toast.makeText（mCtx，“无服务器连接”，Toast.LENGTH_LONG.show（）；
}else if（error.networkResponse！=null&&error.networkResponse.statusCode==500）{
//显示错误消息和日志错误
NetworkError（error.networkResponse.headers.get（“message”）；
字符串mess=error.networkRespo
package com.your.app.name;
import android.content.Context;
import android.util.Log;
import android.widget.Toast;
import com.android.volley.NetworkError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.TimeoutError;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import java.util.Iterator;
import java.util.Map;
/**
* Helper Class to handle Network Requests
* with Volley
*/
public class Network {
private static Network network;
private RequestQueue mRequestQueue;
private static Context mCtx;
public final String TAG = "Network Helper";
/**
* Constructor
*/
private Network(Context c) {
mCtx = c;
mRequestQueue = getRequestQueue();
}
public interface INetworkCallback {
void NetworkSuccess(String response);
void NetworkError(String error);
}
public static synchronized Network getInstance(Context c) {
if (network == null) {
network = new Network(c);
}
return network;
}
public RequestQueue getRequestQueue() {
if (mRequestQueue == null) {
mRequestQueue = Volley.newRequestQueue(mCtx.getApplicationContext());
}
return mRequestQueue;
}
/**
* Perform a POST Request to a specified url;
*
* @param host
* @param url
* @param params
* @param callback new INetworkCallback()
*/
public void postRequest(final String host, final String url, final Map params, final INetworkCallback callback) {
try {
StringRequest postRequest = new StringRequest(Request.Method.POST, (host + url),
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.v(TAG, response);
//make successCallback
callback.NetworkSuccess(response);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
if (error instanceof NetworkError) {
//no response from compound URL
callback.NetworkError(error.toString());
Toast.makeText(mCtx, "No internet connection", Toast.LENGTH_LONG).show();
} else if (error.networkResponse != null && error.networkResponse.statusCode == 500 ||
error.networkResponse != null && error.networkResponse.statusCode == 301) {
//Show errorMessage and log Error
callback.NetworkError(error.networkResponse.headers.get("message"));
String mess = error.networkResponse.headers.get("message");
if (mess != null && !mess.isEmpty()) {
Toast.makeText(mCtx, error.networkResponse.headers.get("message"), Toast.LENGTH_LONG).show();
}
} else {
//some unexpected Error occurred
callback.NetworkError("Network Error: " + error.toString());
}
}
}) {
@Override
protected Map<String, String> getParams() {
return params;
}
};
//add request to queue
addToRequestQueue(postRequest);
} catch (Exception e) {
callback.NetworkError("Error performing Request: - " + e.toString());
}
}
public void getRequest(final String host, final String url, final Map params, final INetworkCallback callback) {
String paramsString = makeGetURL(params);
Log.v(TAG, "======= " + paramsString + " =======");
try {
StringRequest getRequest = new StringRequest(Request.Method.GET, (host + url + paramsString),
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.v(TAG, response);
//make successCallback
callback.NetworkSuccess(response);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
if (error instanceof NetworkError) {
//no response from compound URL
callback.NetworkError(error.toString());
Toast.makeText(mCtx, "No internet connection", Toast.LENGTH_LONG).show();
} else if (error instanceof TimeoutError) {
//no response from compound URL
callback.NetworkError(error.toString());
Toast.makeText(mCtx, "No server connection", Toast.LENGTH_LONG).show();
} else if (error.networkResponse != null && error.networkResponse.statusCode == 500) {
//Show errorMessage and log Error
callback.NetworkError(error.networkResponse.headers.get("message"));
String mess = error.networkResponse.headers.get("message");
if (mess != null && !mess.isEmpty()) {
Toast.makeText(mCtx, error.networkResponse.headers.get("message"), Toast.LENGTH_LONG).show();
}
} else {
//some unexpected Error occurred
callback.NetworkError("NetworkError: " + error.toString());
}
}
});
//add request to queue
addToRequestQueue(getRequest);
} catch (Exception e) {
callback.NetworkError("Error performing request: " + e.toString());
}
}
/**
* Iterates over all Set entries of HashMap and
* generates a GET URL Link base on the key, value pairs
*
* @param params
* @return
*/
private String makeGetURL(Map params) {
String qm;
String url = "";
if (params != null) {
qm = (params.size() > 0) ? "?" : "";
//add ? if there ara parameters
url += qm;
Iterator it = params.entrySet().iterator();
while (it.hasNext()) {
Map.Entry param = (Map.Entry) it.next();
url += param.getKey() + "=" + param.getValue() + "&";
}
//erase last char
try {
url = url.substring(0, url.length() - 1);
} catch (Exception e) {
//IF FAILS it means no parameters have been putted
Log.i(TAG, "no parameters found for get request");
}
}
return url;
}
public <T> void addToRequestQueue(Request<T> req) {
getRequestQueue().add(req);
}
}
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import org.json.JSONArray;
import org.json.JSONObject;
import java.util.HashMap;
public class Test extends AppCompatActivity {
private JSONArray getResults()
{
String myPath = this.getDatabasePath("cart.db").toString();// Set path to your database
String myTable = CartContract.CartEntry.TABLE_NAME;//Set name of your table
SQLiteDatabase myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
String searchQuery = "SELECT * FROM " + myTable;
Cursor cursor = myDataBase.rawQuery(searchQuery, null );
JSONArray resultSet = new JSONArray();
cursor.moveToFirst();
while (cursor.isAfterLast() == false) {
int totalColumn = cursor.getColumnCount();
JSONObject rowObject = new JSONObject();
for( int i=0 ; i< totalColumn ; i++ )
{
if( cursor.getColumnName(i) != null )
{
try
{
if( cursor.getString(i) != null )
{
Log.d("TAG_NAME", cursor.getString(i) );
rowObject.put(cursor.getColumnName(i) , cursor.getString(i) );
}
else
{
rowObject.put( cursor.getColumnName(i) , "" );
}
}
catch( Exception e )
{
Log.d("TAG_NAME", e.getMessage() );
}
}
}
resultSet.put(rowObject);
cursor.moveToNext();
}
cursor.close();
Log.d("FINAL RESULT", resultSet.toString() );
return resultSet;
}
private void sendResult(String resultJSONString) {
//perform post request
HashMap<String, String> params = new HashMap<>();
params.put("data", resultJSONString);
Network.getInstance(this).postRequest("www.some-adress.com/", "do_stuff.php", params, new Network.INetworkCallback() {
@Override
public void NetworkSuccess(String response) {
//
Log.i("RECEIVED RESPONSE", response);
}
@Override
public void NetworkError(String error) {
//
Log.e("ERROR SENDING DATA", error);
}
});
}
public void sendData(String value) {
this.sendResult(getResults().toString());
}
}
<?php
//include my example script db.php
include_once(dirname(__DIR__) . "/Server/DB/DB.php");
$json = '[{"id":"1","food_id":"52","food_price":"30","food_name":"Pink Lemonade","quantity":"5","amount":"150","special_request":""},{"id":"2","food_id":"51","food_price":"30","food_name":"House Blend Iced Tea","quantity":"3","amount":"90","special_request":""}]';
//decode JSON data
$data = json_decode($json, TRUE);
var_dump($data);
$multiQuery = "";
foreach ($data as $item) {
$foodId = $item['food_id'];
$foodPrice = $item['food_price'];
$foodName = $item['food_name'];
$quantity = $item['quantity'];
$amount = $item['amount'];
$specialRequest = $item['special_request'];
$insertQuery = "INSERT INTO your_table_name (food_id, food_price, food_name, quantity, amount, special_request) VALUES ($foodId, $foodPrice, $foodName, $quantity, $amount, $specialRequest);";
$multiQuery .= $insertQuery;
}
$db = new DB();
if($db->multiQuery($multiQuery)) {
//data was saved
} else {
$db->getErrorMessage();
}
?>
<?php
/**
* Class DB
*
* Handles database access and Errors
*/
class DB
{
private $host = "localhost";
private $user = "root";
private $pw = "";
private $dbName = "yourDbNameHere";
private $con;
/**
* Class constructor Method
*/
public function __construct()
{
$this->connect($this->host, $this->user, $this->pw, $this->dbName);
header('Content-Type: text/html; charset=utf-8');
}
/**
* Makes Database connection an
*
* @param $host
* @param $user
* @param $pw
* @param $dbName
*/
public function connect($host, $user, $pw, $dbName)
{
$this->con = mysqli_connect($host, $user, $pw, $dbName);
if($this->con != null) {
$this->con->set_charset('utf8');
} else {
$this->dbError("Keine Verbindung zur Datenbank");
}
}
public function escapeQuery($query)
{
$result = null;
if (!empty($query)) {
return mysqli_real_escape_string($this->con, $query);
} else {
return false;
}
}
/**
* Performs a query against the database and returns the mysqli_result
*
* @param $query
* @return bool|mysqli_result
*/
public function query($query)
{
$result = null;
if (!empty($query)) {
return mysqli_query($this->con, $query);
} else {
$this->dbError("empty query String");
return false;
}
}
/**
*
*
* @param $query
* @return array|bool
*/
public function multiQuery($query)
{
$result = null;
if (!empty($query)) {
$data = array();
if (mysqli_multi_query($this->con, $query)) {
do {
// Store first result set
if ($result = mysqli_store_result($this->con)) {
// Fetch one and one row
while ($row = mysqli_fetch_assoc($result)) {
$data[] = $row;
}
// Free result set
mysqli_free_result($result);
}
} while (mysqli_next_result($this->con));
}
if(mysqli_error($this->con)) {
$error = mysqli_error_list($this->con);
return false;
} else {
if(count($data) > 0) {
return $data;
} else {
return true;
}
}
} else {
$this->dbError("empty query String");
return false;
}
}
/**
* Performs q query against the database and returns JSON object
*
* @param $query
* @return bool
*/
public function queryArray($query)
{
$result = null;
if (!empty($query)) {
$result = mysqli_query($this->con, $query);
$data = array();
if (!empty($result)) {
while ($row = $result->fetch_assoc()) {
$data[] = $row;
}
return ($data);
} else {
$this->dbError(mysqli_error($this->con));
return false;
}
} else {
$this->dbError("empty query String");
return false;
}
}
/**
* Throws error and custom error message if passed as parameter
*
* @param $message
*/
public function dbError($message)
{
Response::sendError($message);
}
/**
* Returns the mysqli_error message if error occurred
*
* @return string
*/
public function getErrorMessage()
{
return mysqli_error($this->con);
}
/**
* Checks if error message contains Duplicate Entry Error
*
* @return bool
*/
public function IsDuplicateEntry()
{
if (strpos($this->getErrorMessage(), "Duplicate") !== false) {
return true;
} else {
false;
}
}
}