前言
由于学校科技立项的项目需要实现Android App端与PHP Web端的简单数据交互的实现，当前场景是Web端使用的是MySql数据库，Apache服务器和PHP语言编写的。数据交互的简单理解就是Android能向服务端进行数据获取，同时也能进行数据提交。
实现流程
流程说明
- Andorid Server端对MySql数据库进行简单的查询操作，并将查询数据结果转换为Json格式提供给Andorid利用OKhttp读取再解析Json展示到APP上；同时Andorid端利用OKhttp提交给Andorid Server端，由Server端对MySql数据库对提交数据的添加。
- Apache Server端通过解析PHP源代码，对MySql数据库的增删查改显示在WebSite。
具体实现
Andorid Server
获取数据
get_all_found_items.php
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| <?php
header('Content-Type:text/html;charset=utf-8');/*设置php编码为utf-8*/
/*
* Following code will list all the items
*/
// array for JSON response
$response = array();
// include db connect class
require_once __DIR__ . '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// get all items from items table
$result = mysql_query("SELECT *FROM items WHERE type='1'") or die(mysql_error());
// check for empty result
if (mysql_num_rows($result) > 0) {
// looping through all results
// items node
$response["items"] = array();
while ($row = mysql_fetch_array($result)) {
// temp user array
$items = array();
$items["what"] = $row["what"];
$items["when"] = $row["when"];
$items["where"] = $row["where"];
$items["detail"] = $row["detail"];
$items["posttime"] = $row["posttime"];
$resultcontcat = mysql_query("SELECT *FROM guests") or die(mysql_error());
while ($row1 = mysql_fetch_array($resultcontcat)) {
if ($row1["id"] == $row["gid"]){
$items["contact"] = $row1["contact"];
}
}
// push single items into final response array
array_push($response["items"], $items);
}
// success
$response["success"] = 1;
// echoing JSON response
echo json_encode($response,JSON_UNESCAPED_UNICODE);
} else {
// no items found
$response["success"] = 0;
$response["message"] = "No items found";
// echo JSON
echo json_encode($response,JSON_UNESCAPED_UNICODE);
}
?>
|
如以上PHP代码可知通过require_once()函数包含db_connect.php文件，执行数据库配置文件。定义数组\$response接收查询的数据结果，通过判断不同的情况赋值$response[“success”]，并返回到Web页面显示
PHP文件执行结果
JSON
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| {
"items": [
{
"what": "手表",
"when": "2017-10-21 00:00:00",
"where": "北区宿舍楼#504",
"detail": "白色的手表，XX品牌",
"posttime": "2017-10-21 13:03:09",
"contact": "138123456"
},
{
"what": "手机",
"when": "2017-10-04 00:00:00",
"where": "北区商店#111",
"detail": "iphone6s,土豪金",
"posttime": "2017-10-21 13:03:46",
"contact": "137123456"
},
{
"what": "电脑",
"when": "2017-10-21 14:39:54",
"where": "图书馆#203",
"detail": "联想品牌笔记本",
"posttime": "2017-10-21 17:08:14",
"contact": "5670001"
},
{
"what": "细说PHP",
"when": "2017-09-21 13:03:46",
"where": "南馆#403",
"detail": "黑色封面，第二版《细说PHP》",
"posttime": "2017-10-21 17:36:53",
"contact": "63513641"
}
],
"success": 1
}
|
提交数据
create_found_items.php
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| <?php
header('Content-Type:text/html;charset=utf-8');/*设置php编码为utf-8*/
/*
* Following code will create a new product row
* All product details are read from HTTP GET Request
*/
// array for JSON response
$response = array();
// check for required fields
if (isset($_GET['what']) && isset($_GET['when']) && isset($_GET['where']) && isset($_GET['detail'])&& isset($_GET['contact'])) {
$what = $_GET['what'];
$when = $_GET['when'];
$where = $_GET['where'];
$detail = $_GET['detail'];
$contact = $_GET['contact'];
// include db connect class
require_once __DIR__ . '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// mysql inserting a new row
$result2 = mysql_query("INSERT INTO guests(contact) VALUES('$contact')");
$gidresult = mysql_query("SELECT id FROM `guests` WHERE contact='$contact'");
while ($row = mysql_fetch_array($gidresult)) {
$gid=$row['id'];
}
$result1 = mysql_query("INSERT INTO items(`what`, `when`, `where`, `type` ,`gid`, `detail`) VALUES('$what', '$when', '$where', '1', '$gid', '$detail')");
// check if row inserted or not
if ($result1 && $result2) {
// successfully inserted into database
$response["success"] = 1;
$response["message"] = "Items successfully created.";
// echoing JSON response
echo json_encode($response,JSON_UNESCAPED_UNICODE);
} else {
// failed to insert row
$response["success"] = 0;
$response["message"] = "Oops! An error occurred.";
// echoing JSON response
echo json_encode($response,JSON_UNESCAPED_UNICODE);
}
} else {
// required field is missing
$response["success"] = 0;
$response["message"] = "Required field(s) is missing";
// echoing JSON response
echo json_encode($response,JSON_UNESCAPED_UNICODE);
}
?>
|
判断GET请求的参数是否都存在，把获取的GET请求参数作为数据INSERT TO MySQL数据库。判断INSERT执行过程赋值\$response[“success”]对应相应的$response[“message”]，显示在Web页面。
执行结果
Andorid
获取数据
核心代码 queryLosts()函数
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| private void queryLosts() {
losts.clear();
new Thread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
OkHttpClient okHttpClient = new OkHttpClient();
String url = "http://webSite/androidapi/get_all_lost_items.php";
Request request = new Request.Builder()
.url(url)
.build();
Call call = okHttpClient.newCall(request);
try {
Response response = call.execute();
String res = response.body().string();
if (res != null && !res.trim().equals("")){
JSONObject jsonObject = new JSONObject(res);
if (jsonObject.getInt("success") == 1){
JSONArray jsonArray = jsonObject.getJSONArray("items");
for (int i = jsonArray.length() - 1;i >= 0;i--){
JSONObject item = jsonArray.getJSONObject(i);
String what = null;
try {
what = item.getString("what");
}catch (Exception e){
}
String when = null;
try{
when = item.getString("when");
}catch (Exception e){
}
String where = null;
try{
where = item.getString("where");
}catch (Exception e){
}
String detail = null;
try {
detail = item.getString("detail");
}catch (Exception e){
}
String contact = null;
try {
contact = item.getString("contact");
}catch (Exception e){
}
Lost lost = new Lost();
lost.setTitle(what);
String des = "地点：" + (where == null?"":where) +" "+"时间：" + (when == null?"":when)+"\r" + " "+"描述：" + (detail == null?"":detail);
lost.setDescribe(des);
lost.setPhone(contact == null?"":contact);
losts.add(lost);
}
}
}
} catch (Exception e) {
e.printStackTrace();
showErrorView(0);
}
if (losts == null || losts.size() == 0) {
handler.sendEmptyMessage(1);
return;
}
if (losts.size() > 0){
handler.sendEmptyMessage(2);
}
}
}).start();
|
利用Android网络框架OKhttp,OKhttp一个处理网络请求的开源项目,是安卓端最火热的轻量级框架.请求接口url地址，获取Json数据利用JSONObject对Json数据进行解析。
提交数据
核心代码 addLost()函数
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public Handler handler = new Handler(){
public void handleMessage(android.os.Message msg) {
switch(msg.what){
case 1:
Toast.makeText(this,"提交成功",Toast.LENGTH_LONG).show();
break;
case 2:
Toast.makeText(this,"提交失败",Toast.LENGTH_LONG).show();
break;
}
}
};
private void addLost(){
OkHttpClient okHttpClient = new OkHttpClient();
String url ="http://website/androidapi/create_lost_items.php?what="+title+"&when="+time+"&where="+place+"&detail="+describe+"&contact="+photo+"";
Request request = new Request.Builder()
.url(url)
.build();
try{
Response response = okHttpClient.newCall(request).execute();
res = response.body().string();
handler.sendEmptyMessage(1);
}catch (Exception e)
{
e.printStackTrace();
handler.sendEmptyMessage(2);
}
}
|
同样利用Okhttp,GET方式提交参数，try-catch获取异常，通过返回值给出一定的提交结果提示。
代码测试
数据同步
Web端
Andorid端
数据提交
提交结果
结语
以上过程基本实现，项目基本上可以交差了。这个项目PHP部分主要是由自己在弄，也是边学边做。Android方面是另外一个同学主要负责，期间也求助过我实习时结交的朋友帮助。感谢所有付出与帮助的人。
