Android访问php webservice

如果是PHP做的服务端，而我们要用android去访问，怎么办？当然可以用REST，但也可以用点笨的方法，比如可以让PHP的服务端返回JSON或XML数据，而Android端则可以用APACHE的httpclient去访问。

下面是一个例子，假设数据表中users表有如下字段(mysql):
idusers,UserName,FullName

加点数据，然后在服务端建立一个webservice1.php，作用是直接返回服务端数据库的数据，如下：

<?php

if (isset($_GET['user']) && intval($_GET['user'])) {

$format = strtolower($_GET['format']) == 'json' ? 'json' : 'xml'; //xml is the default

$user_id = intval($_GET['user']); //no default

 

/* 连接数据库 */

$link = mysql_connect('localhost','root','xxxxx') or die('Cannot connect to the DB');

mysql_select_db('jsonandroid',$link) or die('Cannot select the DB');

 

$query = "SELECT * FROM 'users'";

$result = mysql_query($query,$link);

 

$posts = array();

if (mysql_num_rows($result)) {

while($post = mysql_fetch_assoc($result)) {

$posts[] = array('post'=>$post);

}

}

 

/* json格式 */

if($format == 'json') {

header('Content-type: application/json');

echo json_encode(array('posts'=>$posts));

}

else {

header('Content-type: text/xml');

echo '<posts>';

foreach ($posts as $index => $post) {

if (is_array($post)) {

foreach($post as $key => $value) {

echo '<',$key,'>';

if (is_array($value)) {

foreach($value as $tag => $val) {

echo '<',$tag,'>',htmlentities($val),'</',$tag,'>';

}

}

echo '</',$key,'>';

}

}

}

echo '</posts>';

}

}

?>

则可以把数据表输出为JSON或者XML格式了，客户端的Android调用：

try {

HttpParams httpParams = new BasicHttpParams();

HttpConnectionParams.setConnectionTimeout(httpParams, TIMEOUT_MILLISEC);

HttpConnectionParams.setSoTimeout(httpParams, TIMEOUT_MILLISEC);

 

HttpParams p = new BasicHttpParams();

 

p.setParameter("user", "1");

 

HttpClient httpclient = new DefaultHttpClient(p);

String url = "http://10.0.2.2:8082/myphp/phpWebservice/webservice1.php?user=1&format=json";

HttpPost httppost = new HttpPost(url);

 

try {

Log.i(getClass().getSimpleName(), "send task - start");

 

List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);

nameValuePairs.add(new BasicNameValuePair("user", "1"));

httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

ResponseHandler<String> responseHandler = new BasicResponseHandler();

String responseBody = httpclient.execute(httppost, responseHandler);

// 解析JSON返回的 JSONObject json = new JSONObject(responseBody);

JSONArray jArray = json.getJSONArray("posts");

ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();

 

for (int i = 0; i < jArray.length(); i++) {

HashMap<String, String> map = new HashMap<String, String>();

JSONObject e = jArray.getJSONObject(i);

String s = e.getString("post");

JSONObject jObject = new JSONObject(s);

 

map.put("idusers", jObject.getString("idusers"));

map.put("UserName", jObject.getString("UserName"));

map.put("FullName", jObject.getString("FullName"));

 

mylist.add(map);

}

Toast.makeText(this, responseBody, Toast.LENGTH_LONG).show();

再搞个webservice2.php,该文件用来接受并保存客户端传送过来的JSON数据。

<?php

$json = file_get_contents('php://input');

$obj = json_decode($json);

 

//保存数据库

$con = mysql_connect('localhost','root','XXX') or die('Cannot connect to the DB');

mysql_select_db('jsonandroid', $con);

 

mysql_query("INSERT INTO 'users' (UserName, FullName) VALUES ('".$obj->{'UserName'}."', '".$obj->{'FullName'}."')");

 

mysql_close($con);

 

$posts = array(1);

header('Content-type: application/json');

echo json_encode(array('posts'=>$posts));

?>

而Android客户端，可以构造JSON，发送到webservice2.php

try {

JSONObject json = new JSONObject();

json.put("UserName", "test2");

json.put("FullName", "1234567");

HttpParams httpParams = new BasicHttpParams();

HttpConnectionParams.setConnectionTimeout(httpParams, TIMEOUT_MILLISEC);

HttpConnectionParams.setSoTimeout(httpParams, TIMEOUT_MILLISEC);

HttpClient client = new DefaultHttpClient(httpParams);

String url = "http://10.0.2.2:8082//myphp/phpWebservice/webservice2.php";

 

HttpPost request = new HttpPost(url);

request.setEntity(new ByteArrayEntity(json.toString().getBytes("UTF8")));

request.setHeader("json", json.toString());

HttpResponse response = client.execute(request);

HttpEntity entity = response.getEntity();

 

if (entity != null) {

InputStream instream = entity.getContent();

 

String result = RestClient.convertStreamToString(instream);

Log.i("Read from server", result);

Toast.makeText(this, result,

Toast.LENGTH_LONG).show();

}

这样就可以把Android端发送的数据保存到服务端了。