微信公共平台(一)网址接入

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;

	}

}