Android App端与PHP Web端的简单数据交互实现示例

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

1. 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。

2. 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

<?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

{
 "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

<?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

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

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。希望对大家的学习有所帮助，也希望大家多多支持。

来源：http://uknowsec.cn/posts/notes/Android-App％E7％AB％AF％E4％B8％8EPHP-Web％E7％AB％AF％E7％9A％84％E7％AE％80％E5％8D％95％E6％95％B0％E6％8D％AE％E4％BA％A4％E4％BA％92％E5％AE％9E％E7％8E％B0.html?utm_source=tuicool&utm_medium=referral