android访问php webservice简单一例

  如果是PHP做的服务端,要用android去访问,如何办?当然可以用REST,但也可以用点
笨的方法,比如PHP的服务端可以用JSON和XML提供返回的数据,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PHP,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,$link) or die('Errant query:  '.$query);

    $posts = array();
  if(mysql_num_rows($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,该文件用来把客户端传送过去的JSON数据保存

<?php 

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

//echo $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端的,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发送的数据保存到服务端了