通过JSON将数据从android发送到服务器 [英] Send data from android to server via JSON

问题描述

1. 我有 MySQL 数据库服务器
2. 我需要通过 JSON 向/从 MySQL 服务器更新和检索数据

所以，我想知道如何做到这一点，但我对这个示例语句很困惑:

So, I want to know how to do that, and I pretty confuse with this example statement:

HttpPost httppost = new HttpPost("http://10.0.2.2/city.php");

这意味着我需要编写与 PHP 服务器连接的应用程序之前写php连接数据库对吗?

This means I need to code my application that connect with PHP server before write php to connect to DB right ?

推荐答案

要将数据发送到服务器，您可以这样做:

To send data to server you could do this:

private void sendData(ArrayList<NameValuePair> data)
{
     // 1) Connect via HTTP. 2) Encode data. 3) Send data.
    try
    {
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new      
        HttpPost("http://www.blah.com/AddAccelerationData.php");
        httppost.setEntity(new UrlEncodedFormEntity(data));
        HttpResponse response = httpclient.execute(httppost);
        Log.i("postData", response.getStatusLine().toString());
            //Could do something better with response.
    }
    catch(Exception e)
    {
        Log.e("log_tag", "Error:  "+e.toString());
    }  
}

然后发送让我们说:

private void sendAccelerationData(String userIDArg, String dateArg, String timeArg,
        String timeStamp, String accelX, String accelY, String accelZ)
{
    fileName = "AddAccelerationData.php";

    //Add data to be send.
    ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(7);
    nameValuePairs.add(new BasicNameValuePair("userID", userIDArg));
    nameValuePairs.add(new BasicNameValuePair("date",dateArg));
    nameValuePairs.add(new BasicNameValuePair("time",timeArg));
    nameValuePairs.add(new BasicNameValuePair("timeStamp",timeStamp));

    nameValuePairs.add(new BasicNameValuePair("accelX",accelX));
    nameValuePairs.add(new BasicNameValuePair("accelY",accelY));
    nameValuePairs.add(new BasicNameValuePair("accelZ",accelZ));

    this.sendData(nameValuePairs);
}

那么服务器上的 AddAccelerationData.php 文件是:

so then the AddAccelerationData.php file on server is:

<?php
/*
 * What this file does is it:
 * 1) Creates connection to database.
 * 2) Retrieve the data being send.
 * 3) Add the retrieved data to database 'Data'.
 * 4) Close database connection.
 */
require_once '../Connection.php'; //connect to a database/disconnect handler.
require_once '../SendAPI.php'; //deals with sending querys.

$server = new Connection();
$send = new Send();

//Connect to database.
$server->connectDB();

//Retrieve the data.
$userID = $_POST['userID'];
$date = $_POST['date'];
$time = $_POST['time'];

$accelX = $_POST['accelX'];
$accelY = $_POST['accelY'];
$accelZ = $_POST['accelZ'];

//Add data to database 'Data'. //Personal method to query and add to database.
$send->sendAccelerationData($userID, $date, $time, $timeStamp, $accelX, $accelY, $accelZ);


//Disconnect from database.
$server->disconnectDB();
?>

这是我最近使用的一个例子.只是在php文件中注意.我导入 Connection.php这只是处理与数据库的连接.因此，只需将其替换为连接到 MYSQL 数据库的代码即可.我还导入了 SendAPI.php(你可以忽略它)这只是我发送数据的类.基本上它包含了一些我想使用的查询.如sendAccelerationData().基本上类类似于存储过程.

This is an example I used recently. Just to note in the php file. I import Connection.php this just deals with the connection to the database. So just replace that with your code for connecting to MYSQL db. Also I imported SendAPI.php (which you can just ignore)This was just my class for sending data. Basically it contained some of the querys I wanted to use. Such as sendAccelerationData(). Basically class was similar to that of stored procedures.

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