什么是app接口？app接口就是用服務(wù)端程序如php寫好的腳本，以供app客戶端請求而獲得數(shù)據(jù)的一個東西。比如一個商鋪app的首頁，肯定有一些商品列表，那么當(dāng)你打開這個app時，這個封裝在app里的這個首頁其實會去請求一個遠程php文件如：http://www.example.com/index.php 去獲得需要展示在首頁的商品列表數(shù)據(jù)。前端工程師拿到這些數(shù)據(jù)，就會按照特定的設(shè)計，將這些內(nèi)容展示出來了。
接口要實現(xiàn)的目的就是這樣。一個app內(nèi)部通常需要訪問多個php接口來獲得不同的數(shù)據(jù)。下面具體講一講接口實現(xiàn)的流程以及實現(xiàn)接口需要的一些核心的技術(shù)。

response.html' target='_blank'>class.php

<?php/** *description 用于返回指定數(shù)據(jù)格式的類 *@param $code [int] 返回的狀態(tài)碼 *@param $message [string] 返回的狀態(tài)信息 *@param $data [array] 需要返回的數(shù)據(jù) * */class Response{    public function json($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('Content-Type:text/xml');        $xml = "<?xml version='1.0' encoding='UTF-8'?>/n";        $xml .= "<root>";        $xml .= self::encodeXml($result);        $xml .= "</root>";        return $xml;    }    /**     *將數(shù)據(jù)解析為XML字符串     */    public static function encodeXml($data){        $attr = $xml = "";        foreach($data as $key => $value){                if(is_numeric($key)){                    $attr = " id='{$key}'";                    $key = "item";                }                $xml .= "<{$key}{$attr}>";                $xml .= is_array($value)?self::encodeXml($value):$value;                $xml .= "</$key>";        }        return $xml;    }}

response.class.php是一個最簡單的返回json或XML格式數(shù)據(jù)的類
下面貼出接口文件代碼：
returndata.php

<?phprequire "response.class.php";    //引入返回信息類//準(zhǔn)備返回數(shù)據(jù)$code = 200;$message = "信息請求成功";$data = array(        "name" => "ruanwnewu",        "sex"  => "1",        "age"  => "28",        "exp" => array(                "2012" => "北京瑞泰新",                "2013" => "兄弟連",                "2014" => "木螞蟻科技"            )    );//實例化response類$response = new Response;//返回數(shù)據(jù)echo $response -> json($code,$message,$data);

• 開發(fā)三個接口（登錄、注冊、文件上傳），分別完成對應(yīng)的功能

• 因為本人不做APP開發(fā)，所以在實際的接口測試過程中，運用Firefox瀏覽器的RESTClient擴展模擬APP請求服務(wù)和接收數(shù)據(jù)
  （1）登錄、注冊接口的編寫
  直接上代碼：

<?phprequire ("../connect_db.php");$action = $_REQUEST["action"];$conn = db_connect();mysql_query("set names 'utf8'");mysql_select_db("FECG");switch ($action){    case 'login':       login();       break;    case 'register':       register();       break;    case 'upload':       upload();       break;    default:       break;}//登錄接口function login(){    $account_name = $_POST["username"];    $password = $_POST["password"];    $result = mysql_query("SELECT * FROM app_account WHERE account_name='".$account_name."'");    if (mysql_num_rows($result) > 0){        $row = mysql_fetch_array($result);        $salt = $row["salt"];        $new_password = md5($password."".$salt);        if ($new_password == $row["password"]){            //登錄成功            $current_time = new DateTime();            $login_time = $current_time -> format('Y-m-d H:i:s');            $result =  mysql_query("UPDATE app_account SET last_lgin_time='".$login_time."' WHERE account_name='".$row['account_name']."'");            $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{        //登錄失敗        $json = json_encode(array(              "resultCode"=>500,              "message"=>"please register!"              ));        echo($json);    }}//注冊接口function register(){    $account_name = $_POST["username"];    $password = $_POST["password"];    $result = mysql_query("select * from app_account where account_name='".$account_name."'");    //查詢失敗    if (!$result){        $json = json_encode(array(              "resultCode"=>500,              "message"=>"select failed!"              ));        echo($json);    }    //用戶名已經(jīng)注冊    if (mysql_num_rows($result) > 0){        $json = json_encode(array(              "resultCode"=>500,              "message"=>"register failed!"              ));        echo($json);    }else{        //插入記錄到數(shù)據(jù)庫中        $account_id = uniqid();        $salt = uniqid();        $new_password = md5($password."".$salt);        $current_time = new DateTime();        $create_time = $current_time -> format('Y-m-d H:i:s');        $last_login_time = $create_time;        $result = mysql_query("insert into app_account(account_id,account_name,password,salt,creat_time,last_lgin_time) values('".$account_id."', '".$account_name."', '".$new_password."', '".$salt."', '".$create_time."', '".$last_login_time."')");        $user_id = uniqid();        $result1 = mysql_query("INSERT INTO app_user(user_id,username,account_id) VALUES('".$user_id."', '".$account_name."', '".$account_id."')");        if ($result){           $json = json_encode(array(                 "resultCode"=>200,                 "message"=>"register successed!"                 ));           echo($json);        }    }}//文件上傳接口function upload(){}?>

RESTClient測試：

（注冊也是類似的操作）
（2）文件上傳
因為是模擬，而文件上傳接口涉及到文件的上傳，RESTClient無法模擬。所以單獨寫一個客戶端uploadClient.html來模擬文件上傳。
uploadClient.html

<!DOCTYPE html><html><head>    <title>文件上傳</title>    <meta charset="UTF-8" /></head><body><form action="upload.php" method="post" enctype="multipart/form-data" >    選擇文件：<input type="file" name="filename" />    </br>    用戶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(wù)端接收文件接口upload.php
upload.php

<?phprequire ("../connect_db.php");$conn = db_connect();mysql_query("set names 'utf8'");mysql_select_db("FECG");$file_name = $_POST["filename"];$userid = $_POST["userid"];$heart_rate = $_POST["rate"];if ($_FILES['filename']['name'] != NULL){    if ($_FILES['filename']['error']){        $data = array(            "resultCode"=>1,            "message"=>"失敗，上傳文件出錯!"        );        echo json_encode($data);    }    else{        //獲取文件后綴名        $file_extension = substr(strrchr($_FILES['filename']['name'], '.'), 1);        //判斷文件夾是否存在        $path = "/var/www/html/FECG/fecg_segment_data/".$userid;        if (!file_exists($path)){            //創(chuàng)建以用戶名命名的文件夾            if(mkdir ($path)){               $data = array("message"=>"ok");               echo json_encode($data);}        }        //對上傳文件進行命名        $file_path = '/var/www/html/FECG/fecg_segment_data/'.$userid.'/'.date("YmdHis").".".$file_extension;        if (is_uploaded_file($_FILES['filename']['tmp_name'])){            $result = move_uploaded_file($_FILES['filename']['tmp_name'], $file_path);            if ($result){                //文件上傳成功，進行第二步更新數(shù)據(jù)庫                $result = mysql_query("SELECT * FROM app_account WHERE account_name='".$userid."'");                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"];                $result1 = mysql_query("SELECT * FROM app_user WHERE account_id='".$account_id."'");                $row1 = mysql_fetch_array($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('Y-m-d H:i:s');                $result = mysql_query("INSERT INTO ecg_segment(ecg_segment_id,channel,heart_rate,ecg_url,user_name,user_id)                                      VALUES('".$ecg_segment_id."', '".$channel."', '".$heart_rate."', '".$file_path."', '".$user_name."', '".$user_id."')");                $task_id = uniqid();                $server_analysis = "異常";                $result1 = mysql_query("INSERT INTO task(task_id,creat_time,server_analysis,ecg_segment_id)                                      VALUES('".$task_id."', '".$create_time."', '".$server_analysis."', '".$ecg_segment_id."')");                if ($result){                    $data = array(                        "resultCode"=>2,                        "message"=>"文件上傳成功!"                        );                    echo json_encode($data);                }                else{                    $data = array(                        "resultCode"=>3,                        "message"=>"服務(wù)器錯誤!"                        );                    echo json_encode($data);                }            }            else{                $data = array(                    "resultCode"=>4,                    "message"=>"uploaded failed!"                    );                echo json_encode($data);            }        }        else{            $data = array(                "resultCode"=>5,                "message"=>"文件上傳失敗!"            );            echo json_encode($data);        }    }}else{    $data = array(         "resultCode"=>300,         "message"=>"文件名不能為空!"         );    echo json_encode($data);}?>

（上述代碼都是根據(jù)本人項目需要開發(fā)的相應(yīng)接口）

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