微信認證signature timestamp nonce echostr

1. 微信認證原理

    2.填寫服務器配置

    3.驗證服務器地址的有效性,驗證原理,Token, timestamp, nonce三個參數按照字典排序,拼接成string,而後判斷是否和signature相等

    4.依據接口文檔實現業務邏輯

package com.xp.cn.servlet;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
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;

public class WeiXinParamServlet 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);  
	    }  
	  
	    @Override  
	    public void init() throws ServletException {  
	        Token="xp******************";  
	    } 
	      
	    /** 
	     *@author xp
	     *@desc 接入鏈接生效驗證</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("服務器接入失敗.......");  
	             return ;  
	         }  
	        String echostr=getEchostr();  
	        if(echostr!=null && !"".equals(echostr)){  
	                log.info("服務器接入生效..........");  
	                response.getWriter().print(echostr);//完成相互認證  
	        }  
	    }  
	    /** 
	     * @author xp
	     * Date 2013-04-19 
	     * @desc用來接收微信公衆平臺的驗證 
	     */  
	    private boolean accessing(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {  
	    	//微信加密簽名，signature結合了開發者填寫的token參數和請求中的timestamp參數、nonce參數。
	        String signature = request.getParameter("signature");//微信加密簽名
	        String timestamp = request.getParameter("timestamp");//時間戳  
	        String nonce = request.getParameter("nonce");//隨機數
	        String echostr = request.getParameter("echostr");//隨機數字符串
	        
	        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());
	        //pwd 8052946b7c82d34982bcfcf04ddaa065917dd33f
	        //signature 8052946b7c82d34982bcfcf04ddaa065917dd33f
	           
	        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 xp
	     *@desc XML組裝組件</p> 
	     */  
	     private void message(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException{  
	           
	            InputStream is = request.getInputStream();  
	            // 取HTTP請求流長度  
	            int size = request.getContentLength();  
	            // 用於緩存每次讀取的數據  
	            byte[] buffer = new byte[size];  
	            // 用於存放結果的數組  
	            byte[] xmldataByte = new byte[size];  
	            int count = 0;  
	            int rbyte = 0;  
	            // 循環讀取  
	            while (count < size) {   
	                // 每次實際讀取長度存於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 xp 
	     * @param 
	     * @desc 業務轉發組件 
	     *  
	     */  
	      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 這是好友團隊按鈕的標誌值  
	                         jsonObject.put("Content", "歡迎使用好友團隊菜單click按鈕.");  
	                     }  
	                      
	                 }  
	                 responseStr =creatRevertText(jsonObject);//建立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();  
	        }  
	    
	    private boolean isEmpty(String str){  
	        return null ==str || "".equals(str) ? true :false;  
	    } 
	    
	    private String trim(String str){  
	        return null !=str  ? str.trim() : str;  
	    }  
	      
	
}