php开发微信公众账号开发包开发教程三之请求消息封装
本章讲解如何接收消息，当用户发送消息给公众号时，微信服务器会将信息封装成xml然后转发给我们自己的应用服务器，再将我们响应的信息返回给用户，请参见官方apihttp://mp.weixin.qq.com/wiki/index.php?title=%E6%8E%A5%E6%94%B6%E6%99%AE%E9%80%9A%E6%B6%88%E6%81%AF和http://mp.weixin.qq.com/wiki/index.php?title=%E6%8E%A5%E6%94%B6%E4%BA%8B%E4%BB%B6%E6%8E%A8%E9%80%81 根据文档内容，当微信服务器发送过来的消息大多格式如下<xml>
<ToUserName><!]></ToUserName>
<FromUserName><!]></FromUserName>
<CreateTime>123456789</CreateTime>
<MsgType><!]></MsgType>
<Event><!]></Event>
<EventKey><!]></EventKey>
</xml>
根据用户发送的消息类型，稍微有些不同，所以我们要做的事情就是根据接收的xml然后进行解析，获取消息的类型，是文本信息，语音信息，菜单事件等进行解析，阅读完全部文档后发现请求的xml中<ToUserName><!]></ToUserName>
<FromUserName><!]></FromUserName>
<CreateTime>123456789</CreateTime>
是固定的，不同的是MsgType用于标识消息的类型，然后xml后面的内容稍有所不同，
所以我们定义请求消息基类：
<?php
/**
* 请求信息基类
* @author Administrator
*
*/
abstract classAbstractBaseRequestMessage {
public $postObj;
public$fromUsername;
public$toUsername ;
public$keyword ;
public$msgType; //事件类型 event,text voice vide 等;
public $time ;
/**
*
* @param unknown_type $postObj 请求的xml对象
* */
public function __construct($postObj){
$this->postObj = $postObj;
$this->parsePostObject();
}
/**
* 解析post对象
* ,根据不同的消息类型需要解析xml
* 对象中的更多信息时可以覆盖此方法
*/
protected function parsePostObject(){
$this->fromUsername = $this->postObj->FromUserName;
$this->toUsername = $this->postObj->ToUserName;
$this->keyword = trim($this->postObj->Content);
$this->msgType = $this->postObj->MsgType; //消息类型 event,text等;
$this->time = $this->postObj->CreateTime;
}
}
?>
然后根据文档内容定义各种请求类型
/**
* 文本信息请求类
* @author Administrator
*
*/
class TextRequsetMessage extends AbstractBaseRequestMessage{
}
/**
* 事件请求类,事件没有细分
* @author Administrator
*
*/
class EventRequestMessage extends AbstractBaseRequestMessage {
public $customEvent;
public $eventKey;
protected function parsePostObject(){
$this->customEvent = $this->postObj->Event;//subscribe CLICK
$this->eventKey = $this->postObj->EventKey ;//
parent::parsePostObject();
}
}
/**
* 图片请求类
* @author Administrator
*
*/
class ImageRequestMessage extends AbstractBaseRequestMessage {
public $mediaId;
public $picUrl;
protected function parsePostObject(){
$this->mediaId = $this->postObj->MediaId;
$this->picUrl = $this->postObj->PicUrl;
parent::parsePostObject();
}
}
/**
* 语音请求类
* @author Administrator
*
*/
class VoiceRequestMessage extends AbstractBaseRequestMessage {
public $mediaId;
public $format;
protected function parsePostObject(){
$this->mediaId = $this->postObj->MediaId;
$this->format = $this->postObj->Format;
parent::parsePostObject();
}
}
/**
* 视频请求消息
* @author Administrator
*
*/
class VideRequestMessage extends AbstractBaseRequestMessage {
public $mediaId;
public $thumbMediaId;
protected function parsePostObject(){
$this->mediaId = $this->postObj->MediaId;
$this->thumbMediaId = $this->postObj->ThumbMediaId;
parent::parsePostObject();
}
}
/**
* 地理位置请求信息
* @author Administrator
*
*/
class LocationRequestMessage extends AbstractBaseRequestMessage {
public $location_X;
public $location_Y;
public $scale;
public $label;
protected function parsePostObject(){
$this->location_X = $this->postObj->Location_X;
$this->location_Y = $this->postObj->Location_Y;
$this->scale = $this->postObj->Scale;
$this->label = $this->postObj->Label;
parent::parsePostObject();
}
}
到此请求消息封装完成，下一章将讲解如何封装被动回复信息
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