android json访问php webservice

http://sizeed.blog.163.com/blog/static/965254512012412955872/

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:
Java代码
<?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>';
}

}
?>

<?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:
Java代码

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();

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
Java代码

<?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));

?>

<?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

Java代码
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();
}

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

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