I believe that many people are no longer unfamiliar with WeChat development. I have also been tortured by various problems since I was a rookie in WeChat development, and then I went to search engines to search for various articles to read, but they were basically scattered information, without a unified , systematically explains how to develop WeChat applications. The author combines his actual development experience to summarize and share it with beginners of WeChat development or developers who are studying.

This article mainly explains how to build a WeChat development platform. The ancients said: "Sharpening a knife is worth the effort." We also need to prepare some necessary conditions when developing applications.

Preparation

1. Download Jdk1.7 Installation

2. Download Tomcat 7.0

3. Download Myeclipse 6.5

4. Download Json-lib third-party jar .

1. Apply for a public IP address and publish your own application.

For example: 192.168.1.102

2. Open myeclipse and create a project

As shown below:

3. Create a WeChat application access Servlet class

JAVA implementation class: WeixinServlet

package?com.wx.servlet;
import?java.io.IOException;
import?java.io.InputStream;
import?java.io.OutputStream;
import?java.security.MessageDigest;
import?java.security.NoSuchAlgorithmException;
import?java.util.Arrays;
import?java.util.logging.Logger;
import?javax.servlet.ServletException;
import?javax.servlet.http.HttpServlet;
import?javax.servlet.http.HttpServletRequest;
import?javax.servlet.http.HttpServletResponse;
import?net.sf.json.JSONObject;
import?net.sf.json.xml.XMLSerializer;
?
/**
?*?@author?haibing.xiao
?*?@since?jdk1.6
?*?@version?1.0
?*/
public?class?WeixinServlet?extends?HttpServlet{
	private?Logger?log?=Logger.getLogger(this.getClass().getName());
	private?static?final?long?serialVersionUID?=?1L;
	private???String?Token;
	private???String?echostr;
	@Override
	protected?void?doGet(HttpServletRequest?request,?HttpServletResponse?response)
			throws?ServletException,?IOException?{
		?connect(request,response);
	}
	@Override
	protected?void?doPost(HttpServletRequest?request,?HttpServletResponse?response)
			throws?ServletException,?IOException?{
		message(request,response);
	}
	?
	
	/**
	?*@author?haibing.xiao
	?*@return??
	?*@exception?
	?*@param
	?*?
	?*?<p>接入連接生效驗(yàn)證</p>
	?*/
	private?void?connect(HttpServletRequest?request,HttpServletResponse?response)?throws?ServletException,?IOException{
		log.info("RemoteAddr:?"+?request.getRemoteAddr());
		log.info("QueryString:?"+?request.getQueryString());
		?if(!accessing(request,?response)){
			?log.info("服務(wù)器接入失敗.......");
			?return?;
		?}
		String?echostr=getEchostr();
		if(echostr!=null?&&?!"".equals(echostr)){
				log.info("服務(wù)器接入生效..........");
				response.getWriter().print(echostr);//完成相互認(rèn)證
		}
	}
	/**
	?*?@author?haibing.xiao
	?*?Date?2013-05-29
	?*?@return?boolean
	?*?@exception?ServletException,?IOException
	?*?@param
	?*
	?*<p>用來接收微信公眾平臺(tái)的驗(yàn)證</p>?
	?*/
	private?boolean?accessing(HttpServletRequest?request,?HttpServletResponse?response)throws?ServletException,?IOException?{
		String?signature?=?request.getParameter("signature");
		String?timestamp?=?request.getParameter("timestamp");
		String?nonce?=?request.getParameter("nonce");
		String?echostr?=?request.getParameter("echostr");
		if(?isEmpty(signature)){
			return?false;
		}
		if(isEmpty(timestamp)){
			return?false;
		}
		if(isEmpty(nonce)){
			return?false;
		}
		if(isEmpty(echostr)){
			return?false;
		}
		String[]?ArrTmp?=?{?Token,?timestamp,?nonce?};
		Arrays.sort(ArrTmp);
		StringBuffer?sb?=?new?StringBuffer();
		for?(int?i?=?0;?i?XML組裝組件
	?*/
	?private?void?message(HttpServletRequest?request,HttpServletResponse?response)?throws?ServletException,?IOException{
		?
			InputStream?is?=?request.getInputStream();
			//?取HTTP請(qǐng)求流長(zhǎng)度
			int?size?=?request.getContentLength();
			//?用于緩存每次讀取的數(shù)據(jù)
			byte[]?buffer?=?new?byte[size];
			//?用于存放結(jié)果的數(shù)組
			byte[]?xmldataByte?=?new?byte[size];
			int?count?=?0;
			int?rbyte?=?0;
			//?循環(huán)讀取
			while?(count?業(yè)務(wù)轉(zhuǎn)發(fā)組件
	?*?
	?*/
	??private?void??manageMessage(String?requestStr,HttpServletRequest?request,HttpServletResponse?response)throws?ServletException,IOException{
		????
		????String?responseStr;
		???
			try?{
				?XMLSerializer?xmlSerializer=new?XMLSerializer();
				?JSONObject?jsonObject?=(JSONObject)?xmlSerializer.read(requestStr);
				?String?event?=jsonObject.getString("Event");
				?String?msgtype?=jsonObject.getString("MsgType");
				?if("CLICK".equals(event)?&&?"event".equals(msgtype)){?//菜單click事件
					?String?eventkey?=jsonObject.getString("EventKey");
					?if("hytd_001".equals(eventkey)){?//?hytd_001?這是好友團(tuán)隊(duì)按鈕的標(biāo)志值
						?jsonObject.put("Content",?"歡迎使用好友團(tuán)隊(duì)菜單click按鈕.");
					?}
					
				?}
				?responseStr?=creatRevertText(jsonObject);//創(chuàng)建XML
				?log.info("responseStr:"+responseStr);
				?OutputStream?os?=response.getOutputStream();
				?os.write(responseStr.getBytes("UTF-8"));
			}???catch?(Exception?e)?{
				e.printStackTrace();
			}
			
	}
	private?String?creatRevertText(JSONObject?jsonObject){
	????	StringBuffer?revert?=new?StringBuffer();
	????	revert.append("<xml>");
	????	revert.append("<tousername></tousername>");
	????	revert.append("<fromusername></fromusername>");
	????	revert.append("<createtime>"+jsonObject.get("CreateTime")+"</createtime>");
	????	revert.append("<msgtype></msgtype>");
	????	revert.append("<content></content>");
	????	revert.append("<funcflag>0</funcflag>");
	????	revert.append("</xml>");
	????	return?revert.toString();
	????}
	@Override
	public?void?init()?throws?ServletException?{
		Token="test123";
	}
	?
	private?boolean?isEmpty(String?str){
		return?null?==str?||?"".equals(str)???true?:false;
	}
	private?String?trim(String?str){
		return?null?!=str????str.trim()?:?str;
	}
	
}

4. Locally deployed application visit http://localhost:port No./Context/wenxin

5 .Apply to become a developer

Visit http://mp.weixin.qq.com , turn on developer mode. Fill in the URL and take, and the application is successful, as shown below:

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