weixin-popular 包括微信公众平台基础API与支付API,提供便捷的API调用接口.

MediaAPI 多媒体上传下载
MenuAPI 菜单
MessageAPI 信息发送
PayAPI 支付订单相关接口
QrcodeAPI 二维码
SnsAPI 网签授权
TokenAPI token 获取
UserAPI 用户管理

工具类

PayUtil 支付工具类，生成JS支付，原生支付
SignatureUtil 签权生成、验证
XMLConverUtil XML 对象转换（JAXB）

微信公众平台开发者文档 http://mp.weixin.qq.com/wiki/index.php
微信支付文档 http://mp.weixin.qq.com/cgi-bin/readtemplate?t=business/faq_tmpl&lang=zh_CN

import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;

import javax.servlet.ServletException;
import javax.servlet.ServletInputStream;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.util.StreamUtils;

import weixin.popular.bean.EventMessage;
import weixin.popular.bean.xmlmessage.XMLTextMessage;
import weixin.popular.util.SignatureUtil;
import weixin.popular.util.XMLConverUtil;

public class ReceiveServlet extends HttpServlet{

private String token = "test";

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    ServletInputStream inputStream = request.getInputStream();
    ServletOutputStream outputStream = response.getOutputStream();
    String signature = request.getParameter("signature");
    String timestamp = request.getParameter("timestamp");
    String nonce = request.getParameter("nonce");
    String echostr = request.getParameter("echostr");

    //首次请求申请验证,返回echostr
    if(echostr!=null){
        outputStreamWrite(outputStream,echostr);
        return;
    }

    //验证请求签名
    if(!signature.equals(SignatureUtil.generateEventMessageSignature(token,timestamp,nonce))){
        System.out.println("The request signature is invalid");
        return;
    }

    if(inputStream!=null){
        String xml = StreamUtils.copyToString(inputStream,Charset.forName("utf-8"));
        System.out.println("xml: "+xml);
        //转换XML
        EventMessage eventMessage = XMLConverUtil.convertToObject(EventMessage.class,xml);
        //创建回复
        XMLTextMessage xmlTextMessage = new XMLTextMessage(
                eventMessage.getFromUserName(), 
                eventMessage.getToUserName(),
                "你好");
        //回复
        xmlTextMessage.outputStreamWrite(outputStream);
        return;
    }
    outputStreamWrite(outputStream,"");
}

/**
 * 数据流输出
 * @param outputStream
 * @param text
 * @return
 */
private boolean outputStreamWrite(OutputStream outputStream,String text){
    try {
        outputStream.write(text.getBytes("utf-8"));
    } catch (UnsupportedEncodingException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        return false;
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        return false;
    }
    return true;
}

}

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