android与php后台服务的数据交换例子webservice1.php

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