package com.nko.wechat;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;

import com.nko.utils.DisposeMessage;
import com.nko.bean.Parameter;

/**
 * 此Servlet用于向微信服务器发送和接收消息
 * @author ZZK
 *
 */
@WebServlet(name = "wechat", urlPatterns = "/wechat")
public class Wechat extends HttpServlet {
	Logger logger = Logger.getLogger(this.getClass());

	private static final long serialVersionUID = 1L;	//

	@Override
	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		System.out.println("----------get---------------");
		response.getWriter().print(request.getParameter("echostr"));
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 * 
	 * 用于和微信平台服务器交互的servlet
	 * @descript 接收到微信服务器发送过来的
	 */
	@Override
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		System.out.println("----------post---------------");

		System.out.println("=====URL\t" + request.getRequestURL());
		System.out.println("=====remoteAddr\t" + request.getRemoteAddr());

		// 设置请求与响应的编码
		request.setCharacterEncoding("UTF-8");
		response.setCharacterEncoding("UTF-8");

		// 获取接收到的消息XML
		String wechatXML = org.apache.commons.io.IOUtils.toString(request.getReader());
		System.out.println("+++++++++++++++++++++++++++" + wechatXML);

		// 调用解析方法并获取所有可用参数
		Parameter param = DisposeMessage.getMostlyParameter(wechatXML);

		// 获取当前工程的完整路径 用于回复请求
		String basePath = request.getScheme() + "://" + request.getServerName()
			+ ":" + request.getServerPort() + request.getContextPath();

		// 获取返回消息的XML
		String reXML = DisposeMessage.replyMSG(param, basePath);
		System.out.println("========================" + reXML);

		PrintWriter out = response.getWriter();
		out.write(reXML);
		out.flush();
		out.close();
	}
}