微信公共平台(一)网址接入

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package com.chaowen;

 

import java.io.IOException;

import java.io.PrintWriter;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

import java.util.Arrays;

 

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

 

/**

 * Servlet implementation class WeiXinServlet

 */

public class WeiXinServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    public static final String Token = "token";  

 

 

 

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        this.doPost(request, response);

    }

 

 

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        //response.setContentType("text/xml;charset=utf-8");

        response.setCharacterEncoding("UTF-8");

        PrintWriter   out   =   response.getWriter();

 

        String signature = request.getParameter("signature");

        String timestamp = request.getParameter("timestamp");

        String nonce = request.getParameter("nonce");

        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());

        String echostr = request.getParameter("echostr");

        System.out.println("pwd=="+pwd);

        System.out.println("echostr=="+echostr);

        if(pwd.equals(signature)){

            if(!"".equals(echostr) && echostr != null){

                response.getWriter().print(echostr);

            }

        }

 

        out.flush();

        out.close();

    }

 

    public 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;

    }

}