PHP服務端開發APP介面

這篇文章介紹的是關於PHP服務端開發APP接口，現在跟大家分享一下，有興趣的朋友可以看一下

##一、APP接口簡介

什麼是app介面？ app介面就是用服務端程式如php寫好的腳本，以供app客戶端請求而取得資料的東西。例如一個商舖app的首頁，一定有一些商品列表，那麼當你打開這個app時，這個封裝在app裡的這個首頁其實會去請求一個遠端php檔案如：http://www.example.com/index .php 去取得需要展示在首頁的商品清單資料。前端工程師拿到這些數據，就會依照特定的設計，將這些內容展示出來了。

介面要實現的目的就是這樣。一個app內部通常需要存取多個php介面來獲得不同的資料。以下具體講一講介面實現的流程以及實作介面所需的一些核心的技術。

---

二、PHP介面知識

JSON與XML方式封裝通訊介面

response.class.php

<?php/**
 *description 用于返回指定数据格式的类
 *@param $code [int] 返回的状态码
 *@param $message [string] 返回的状态信息
 *@param $data [array] 需要返回的数据
 *
 */class Response{
    public function json($code,$message,$data){
        $result = array(                "code" => $code,                "message" => $message,                "data" => $data
            );        return json_encode($result);
    }    public function xml($code,$message,$data){
        $result = array(                "code" => $code,                "message" => $message,                "data" => $data
            );
        header(&#39;Content-Type:text/xml&#39;);        $xml = "<?xml version=&#39;1.0&#39; encoding=&#39;UTF-8&#39;?>\n";        $xml .= "<root>";        $xml .= self::encodeXml($result);        $xml .= "</root>";        return $xml;
    }    /**
     *将数据解析为XML字符串
     */

    public static function encodeXml($data){
        $attr = $xml = "";        foreach($data as $key => $value){                if(is_numeric($key)){                    $attr = " id=&#39;{$key}&#39;";                    $key = "item";
                }                $xml .= "<{$key}{$attr}>";                $xml .= is_array($value)?self::encodeXml($value):$value;                $xml .= "</$key>";
        }        return $xml;
    }
}

response.class.php是一個最簡單的回傳json或XML格式資料的類別

下面貼出介面文件程式碼：
returndata.php

<?phprequire "response.class.php";    //引入返回信息类//准备返回数据$code = 200;$message = "信息请求成功";$data = array(        "name" => "ruanwnewu",        "sex"  => "1",        "age"  => "28",        "exp" => array(                "2012" => "北京瑞泰新",                "2013" => "兄弟连",                "2014" => "木蚂蚁科技"
            )
    );//实例化response类$response = new Response;//返回数据echo $response -> json($code,$message,$data);

三、實際開發範例

• 開發三個介面（登入、註冊、檔案上傳），分別完成對應的功能

• #因為自己不做APP開發，所以在實際的介面測試過程中，運用Firefox瀏覽器的RESTClient擴充功能模擬APP請求服務與接收資料

  （1）登入、註冊介面的編寫
  直接上程式碼：
  

<?phprequire ("../connect_db.php");$action = $_REQUEST["action"];$conn = db_connect();
mysql_query("set names &#39;utf8&#39;");
mysql_select_db("FECG");switch ($action){    case &#39;login&#39;:
       login();       break;    case &#39;register&#39;:
       register();       break;    case &#39;upload&#39;:
       upload();       break;    default:       break;
}//登录接口function login(){
    $account_name = $_POST["username"];    $password = $_POST["password"];    $result = mysql_query("SELECT * FROM app_account WHERE account_name=&#39;".$account_name."&#39;");    if (mysql_num_rows($result) > 0){        $row = mysql_fetch_array($result);        $salt = $row["salt"];        $new_password = md5($password."".$salt);        if ($new_password == $row["password"]){            //登录成功
            $current_time = new DateTime();            $login_time = $current_time -> format(&#39;Y-m-d H:i:s&#39;);            $result =  mysql_query("UPDATE app_account SET last_lgin_time=&#39;".$login_time."&#39; WHERE account_name=&#39;".$row[&#39;account_name&#39;]."&#39;");            $array = array();            $array["account_id"] = $row["account_id"];            $array["account_name"] = $row["account_name"];            $array["create_time"] = $row["creat_time"];            $json = json_encode(array(                  "resultCode"=>200,                  "message"=>"login successed!",                  "data"=>$array));            echo($json);
        }else{            $json = json_encode(array(                  "resultCode"=>500,                  "message"=>"The password is wrong!please try again."
                  ));            echo($json);
         }
    }else{        //登录失败
        $json = json_encode(array(              "resultCode"=>500,              "message"=>"please register!"
              ));        echo($json);
    }
}//注册接口function register(){
    $account_name = $_POST["username"];    $password = $_POST["password"];    $result = mysql_query("select * from app_account where account_name=&#39;".$account_name."&#39;");    //查询失败
    if (!$result){        $json = json_encode(array(              "resultCode"=>500,              "message"=>"select failed!"
              ));        echo($json);
    }    //用户名已经注册
    if (mysql_num_rows($result) > 0){        $json = json_encode(array(              "resultCode"=>500,              "message"=>"register failed!"
              ));        echo($json);
    }else{        //插入记录到数据库中
        $account_id = uniqid();        $salt = uniqid();        $new_password = md5($password."".$salt);        $current_time = new DateTime();        $create_time = $current_time -> format(&#39;Y-m-d H:i:s&#39;);        $last_login_time = $create_time;        $result = mysql_query("insert into app_account(account_id,account_name,password,salt,creat_time,last_lgin_time) values(&#39;".$account_id."&#39;, &#39;".$account_name."&#39;, &#39;".$new_password."&#39;, &#39;".$salt."&#39;, &#39;".$create_time."&#39;, &#39;".$last_login_time."&#39;)");        $user_id = uniqid();        $result1 = mysql_query("INSERT INTO app_user(user_id,username,account_id) VALUES(&#39;".$user_id."&#39;, &#39;".$account_name."&#39;, &#39;".$account_id."&#39;)");        if ($result){           $json = json_encode(array(                 "resultCode"=>200,                 "message"=>"register successed!"
                 ));           echo($json);
        }
    }
}//文件上传接口function upload(){}?>

RESTClient測試：

（註冊也是類似的操作）
（2）檔案上傳
因為是模擬，而檔案上傳介面涉及到檔案的上傳，RESTClient無法模擬。所以單獨寫一個客戶端uploadClient.html來模擬檔案上傳。
uploadClient.html

<!DOCTYPE html><html><head>
    <title>文件上传</title>
    <meta charset="UTF-8" /></head><body><form action="upload.php" method="post" enctype="multipart/form-data" >
    选择文件：<input type="file" name="filename" />
    </br>
    用户ID：<input type="text" name="userid" /></br>
    心率：<input type="text" name="rate" /></br>
    <input type="submit" value="提交"></form></body></html>

服務端接收檔案介面upload.php

upload.php

<?phprequire ("../connect_db.php");$conn = db_connect();
mysql_query("set names &#39;utf8&#39;");
mysql_select_db("FECG");$file_name = $_POST["filename"];$userid = $_POST["userid"];$heart_rate = $_POST["rate"];if ($_FILES[&#39;filename&#39;][&#39;name&#39;] != NULL){    if ($_FILES[&#39;filename&#39;][&#39;error&#39;]){        $data = array(            "resultCode"=>1,            "message"=>"失败，上传文件出错!"
        );        echo json_encode($data);
    }    else{        //获取文件后缀名
        $file_extension = substr(strrchr($_FILES[&#39;filename&#39;][&#39;name&#39;], &#39;.&#39;), 1);        //判断文件夹是否存在
        $path = "/var/www/html/FECG/fecg_segment_data/".$userid;        if (!file_exists($path)){            //创建以用户名命名的文件夹
            if(mkdir ($path)){               $data = array("message"=>"ok");               echo json_encode($data);}
        }        //对上传文件进行命名
        $file_path = &#39;/var/www/html/FECG/fecg_segment_data/&#39;.$userid.&#39;/&#39;.date("YmdHis").".".$file_extension;        if (is_uploaded_file($_FILES[&#39;filename&#39;][&#39;tmp_name&#39;])){            $result = move_uploaded_file($_FILES[&#39;filename&#39;][&#39;tmp_name&#39;], $file_path);            if ($result){                //文件上传成功，进行第二步更新数据库
                $result = mysql_query("SELECT * FROM app_account WHERE account_name=&#39;".$userid."&#39;");                if (!$result){                     $num = 123;                     $data = array(                        "resultCode"=>2,                        "message"=>"userid",                        "data"=>$userid
                     );                     echo json_encode($data);
                }                $row = mysql_fetch_array($result, MYSQL_ASSOC);                $account_id = $row["account_id"];                $result1 = mysql_query("SELECT * FROM app_user WHERE account_id=&#39;".$account_id."&#39;");                $row1 = mysql_fetch_array($result1, MYSQL_ASSOC);                $user_id = $row1["user_id"];                $user_name = $row1["username"];                $ecg_segment_id = uniqid();                $channel = 3;                $current_time = new DateTime();                $create_time = $current_time -> format(&#39;Y-m-d H:i:s&#39;);                $result = mysql_query("INSERT INTO ecg_segment(ecg_segment_id,channel,heart_rate,ecg_url,user_name,user_id)
                                      VALUES(&#39;".$ecg_segment_id."&#39;, &#39;".$channel."&#39;, &#39;".$heart_rate."&#39;, &#39;".$file_path."&#39;, &#39;".$user_name."&#39;, &#39;".$user_id."&#39;)");                $task_id = uniqid();                $server_analysis = "异常";                $result1 = mysql_query("INSERT INTO task(task_id,creat_time,server_analysis,ecg_segment_id)
                                      VALUES(&#39;".$task_id."&#39;, &#39;".$create_time."&#39;, &#39;".$server_analysis."&#39;, &#39;".$ecg_segment_id."&#39;)");                if ($result){                    $data = array(                        "resultCode"=>2,                        "message"=>"文件上传成功!"
                        );                    echo json_encode($data);
                }                else{                    $data = array(                        "resultCode"=>3,                        "message"=>"服务器错误!"
                        );                    echo json_encode($data);
                }
            }            else{                $data = array(                    "resultCode"=>4,                    "message"=>"uploaded failed!"
                    );                echo json_encode($data);
            }
        }        else{            $data = array(                "resultCode"=>5,                "message"=>"文件上传失败!"
            );            echo json_encode($data);
        }
    }
}else{    $data = array(         "resultCode"=>300,         "message"=>"文件名不能为空!"
         );    echo json_encode($data);
}?>

（上述程式碼都是根據本人專案需要開發的對應介面）

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