JAVA微信开发-新手接入指南

相信很多人对微信开发已经不那么陌生，我也是从一个微信开发的菜鸟经过各种问题的折磨，然后去搜索引擎搜索各种文章阅读，但是基本都是零散的资料，没有一个统一、系统的阐述微信应用如何开发。作者结合自己的实际开发经验，归纳整理出来分享给微信开发的入门者或正在研究的开发者。

这篇文章主要阐述如何搭建一个微信开发平台。古人云：“磨刀不负砍才工”。我们开发应用也需要准备一些必要的条件

 准备工作

 1.  下载 Jdk1.7  安装

 2.  下载 Tomcat 7.0

 3.  下载 Myeclipse 6.5

 4.  下载 Json-lib第三方jar .

1.      申请一个公网IP地址，发布自己的应用。

例如： 192.168.1.102

 

2.      打开myeclipse 创建一个工程

如下图所示：



3.  创建一个微信应用接入Servlet类


JAVA实现类 ：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>接入连接生效验证</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("服务器接入失败.......");
return ;
}
String echostr=getEchostr();
if(echostr!=null && !"".equals(echostr)){
log.info("服务器接入生效..........");
response.getWriter().print(echostr);//完成相互认证
}
}
/**
* @author haibing.xiao
* Date 2013-05-29
* @return boolean
* @exception ServletException, IOException
* @param
*
*<p>用来接收微信公众平台的验证</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 < ArrTmp.length; i++) {
sb.append(ArrTmp[i]);
}
String pwd = Encrypt(sb.toString());

log.info("signature:"+signature+"timestamp:"+timestamp+"nonce:"+nonce+"pwd:"+pwd+"echostr:"+echostr);

if(trim(pwd).equals(trim(signature))){
this.echostr =echostr;
return true;
}else{
return false;
}
}
private String Encrypt(String strSrc) {
MessageDigest md = null;
String strDes = null;

byte[] bt = strSrc.getBytes();
try {
md = MessageDigest.getInstance("SHA-1");
md.update(bt);
strDes = bytes2Hex(md.digest()); //to HexString
} catch (NoSuchAlgorithmException e) {
System.out.println("Invalid algorithm.");
return null;
}
return strDes;
}

public String bytes2Hex(byte[] bts) {
String des = "";
String tmp = null;
for (int i = 0; i < bts.length; i++) {
tmp = (Integer.toHexString(bts[i] & 0xFF));
if (tmp.length() == 1) {
des += "0";
}
des += tmp;
}
return des;
}

public String getEchostr(){
return echostr;
}
/**
*@author haibing.xiao
*@return
*@exception ServletException, IOException
*@param
*
* <p>XML组装组件</p>
*/
private void message(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException{

InputStream is = request.getInputStream();
// 取HTTP请求流长度
int size = request.getContentLength();
// 用于缓存每次读取的数据
byte[] buffer = new byte[size];
// 用于存放结果的数组
byte[] xmldataByte = new byte[size];
int count = 0;
int rbyte = 0;
// 循环读取
while (count < size) {
// 每次实际读取长度存于rbyte中
rbyte = is.read(buffer);
for(int i=0;i<rbyte;i++) {
xmldataByte[count + i] = buffer[i];
}
count += rbyte;
}
is.close();
String requestStr = new String(xmldataByte, "UTF-8");

try{
manageMessage(requestStr,request,response);
}catch(Exception e){
e.printStackTrace();
}

}

/**
* @author haibing.xiao
* @return
* @exception ServletException, IOException
* @param
*
* <p>业务转发组件</p>
*
*/
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)){ //菜单click事件
String eventkey =jsonObject.getString("EventKey");
if("hytd_001".equals(eventkey)){ // hytd_001 这是好友团队按钮的标志值
jsonObject.put("Content", "欢迎使用好友团队菜单click按钮.");
}

}
responseStr =creatRevertText(jsonObject);//创建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><![CDATA["+jsonObject.get("ToUserName")+"]]></ToUserName>");
revert.append("<FromUserName><![CDATA["+jsonObject.get("FromUserName")+"]]></FromUserName>");
revert.append("<CreateTime>"+jsonObject.get("CreateTime")+"</CreateTime>");
revert.append("<MsgType><![CDATA[text]]></MsgType>");
revert.append("<Content><![CDATA["+jsonObject.get("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.   本地部署应用  访问http://localhost:端口号/上下文/wenxin 



5  .申请成为开发者

访问 http://mp.weixin.qq.com   ，开启开发者模式。填入URL和taken，申请成功，如下所示：



填入URL：http://外网IP/TestWeixin/weixin 【必须80端】

填入token :  test123【需要与代码中的token保持一致，Token的长度是有限制的，根据笔者的经验最好不超过10个字符。】