Android访问php webservice-白红宇

Android访问php webservice

阅读量：6152 次

发布时间：2019-06-21

本文共 4377 字，大约阅读时间需要 14 分钟。

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 = 
""
;
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();
}