Backend Development
PHP Tutorial
Android interacts with PHP, Android passes JSON data, and PHP accepts and saves the data
Android interacts with PHP, Android passes JSON data, and PHP accepts and saves the data
I suddenly thought of such a function. When a user logs in using a certain client, the client does the following two things. One is to jump to the page and return personal information; the second is to return the information to the server, and the server saves the data. in the database. In this way, the user's personal information is also obtained!
Let’s make it happen without further delay!
It just so happens that my SAE cloud beans haven’t been used up yet, so I plan to use PHP as the backend!
It is now more popular to transfer Json strings between client and server! (Fortunately, I have learned about Json before), Android packages the data into Json format, and then sends it to the PHP backend through Httpclient. PHP gets the Json string based on the attribute name, then parses it, and finally saves it (MySQL). This is the process.
Step 1: Android client encapsulates Json format data
First encapsulate the data you want to transmit into Json format data. You can use Json package or Gson. I use Gson, what I want to transmit is the User object, the code is as follows:
<span style="font-family:Microsoft YaHei;font-size:14px;">Gson gson = new Gson(); gson.toJson(user)) </span>
Step 2: Write an asynchronous method in the login return thread (of course, You can call asynchronous at any time. I will trigger the asynchronous task when the login information is returned). In the asynchronous task, call the method of Httpclient to send the request. The code is as follows:
<span style="font-family:Microsoft YaHei;font-size:14px;">/**
*
* 描述 向后台发送user数据
* @param user
*/
<span style="font-family:Times New Roman;">public static void SaveDataToPhp(User user){
Gson gson = new Gson();
String url = "http://bmhjqs.sinaapp.com/ChzuAppDate/chzu_user_save.php";
HttpPost httpRequest = new HttpPost(url);
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("userJson", gson.toJson(user)));
try {
HttpEntity httpEntity = new UrlEncodedFormEntity(params,"utf-8");
httpRequest.setEntity(httpEntity);
HttpClient httpClient = new DefaultHttpClient();
HttpResponse httpResponse = httpClient.execute(httpRequest);
if(httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK){
String result = EntityUtils.toString(httpResponse.getEntity());
Log.i("save", result);
}else{
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}</span>
</span>Step 3: Receive Json data
In php, get the Value through the parameter Key, the code is as follows:
<span style="font-family:Microsoft YaHei;font-size:14px;">//接受客户端传来的json数据
<span style="font-family:Times New Roman;">$json_string = $_POST ["userJson"];
$user = json_decode ( $json_user );
if (ini_get ( "magic_quotes_gpc" ) == "1") {
$json_string = stripslashes ( $json_string );
}</span>
$user = json_decode ( $json_string, true );//必须加参数‘true’，否则PHP不认为$user是个数组</span>Step 4: Save the data
I save the data in the Mysql database under SAE, the code is as follows:
<span style="font-family:Microsoft YaHei;font-size:14px;">// 开始保存到数据库
<span style="font-family:Times New Roman;">$link = mysql_connect ( SAE_MYSQL_HOST_M . ':' . SAE_MYSQL_PORT, SAE_MYSQL_USER, SAE_MYSQL_PASS );
if ($link) {
mysql_select_db ( SAE_MYSQL_DB, $link );
//根据ID判断数据库里是否存在
$isExit = "查询语句";
$result = mysql_query($isExit);
if(mysql_num_rows($result) < 1){
$sql = "插入语句...";
mysql_query ( 'set names utf-8' );
mysql_query ( $sql );
echo 'STATE_OK';
}else{
echo 'STATE_EXIST';
}
mysql_close ( $link );
} else {
echo 'STATE_DB_FAIL';
}</span></span>The test was successful and the data can be saved normally!
If you find it objectively useful, give it a like. . . I will work harder
If there is something wrong, please point it out and I will correct it!
The above introduces the interaction between Android and PHP. Android transmits JSON data, and PHP accepts and saves the data, including the content. I hope it will be helpful to friends who are interested in PHP tutorials.
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