微信支付 java 服务端demo （v3版本app支付 springMVC框架中）

//静态资源

/** 
 * @author 徐小骥
 * @version ：2016-5-9 上午11:43:48 
 */

public class WeixinPayConstants {
	public static final String appid = "XXXXXX";//在微信开发平台登记的app应用
	public static final String appsecret = "XXXXXXXXX";
	public static final String partner = "XXXXXXXXX";//商户号
	public static final String partnerkey ="XXXXXXXXXXXXXXXXXXXXXXXXXXXXX";//不是商户登录密码，是商户在微信平台设置的32位长度的api秘钥，
	public static final String createOrderURL="https://api.mch.weixin.qq.com/pay/unifiedorder";
	public static final String backUri="http://XXXXXXXX/api/weixin/topay.jhtml";//微信支付下单地址
	public static final String notify_url="http://XXXXXXXXXX/api/weixin/notify.jhtml";//异步通知地址
}

//

/** 
 * @author 徐小骥
 * @version ：2016-5-9 上午11:46:48 
 */
@Controller("weixinPayController")
@RequestMapping("/api/weixin")
public class WeixinPayController {
@Resource(name = "memberServiceImpl")
private MemberService memberService;
@Resource(name = "orderServiceImpl")
private RecordsConsumptionService  recordsConsumptionService;
//商户相关资料 
private static String appid = WeixinPayConstants.appid;
private static String appsecret = WeixinPayConstants.appsecret;
private static String partner = WeixinPayConstants.partner;
private static String partnerkey = WeixinPayConstants.partnerkey;
@RequestMapping(value = "/topay") 
@ResponseBody public void topay(HttpServletRequest request,HttpServletResponse response) throws Exception{
	request.setCharacterEncoding("UTF-8");
	response.setCharacterEncoding("UTF-8");
	response.setContentType("text/html;charset=UTF-8");
	String orderNo= request.getParameter("Orderid");
	String mobile= request.getParameter("mobile");
	PrintWriter out = response.getWriter();
	String json=null;
     JSONObject retMsgJson=new JSONObject();
	if(orderNo==null||mobile==null){
		retMsgJson.put("msg", "error");
		retMsgJson.put("body", "数据请求异常");
		json=retMsgJson.toString();					
	    out.write(json);
	    out.close();
	    return;
	}
	Member member=memberService.findListByMobile(mobile);//获取用户数据
	Order order=orderService.find(Long.valueOf(orderNo));//获取订单数据
     //验证订单与支付会员关系
     if(member==null||order==null){
		retMsgJson.put("msg", "error");
		retMsgJson.put("body", "数据请求异常");
		json=retMsgJson.toString();					
	    out.write(json);
	    out.close();
	    return;
	}
	if(!order.getMember().equals(member)){
		retMsgJson.put("msg", "error");
		retMsgJson.put("body", "无权限处理订单");
		json=retMsgJson.toString();					
	    out.write(json);
	    out.close();
	    return;
	}
	if(!order.getPaymentStatus().equals(Order.PaymentStatus.unpaid)){
		retMsgJson.put("msg", "error");
		retMsgJson.put("body", "订单状态异常");
		json=retMsgJson.toString();					
	    out.write(json);
	    out.close();
	    return;
	}
	String userId = member.getId().toString(); 	
	String money = order.getAmount().toString();//获取订单金额
	//金额转化为分为单位
	float sessionmoney = Float.parseFloat(money);
	String finalmoney = String.format("%.2f", sessionmoney);
	finalmoney = finalmoney.replace(".", "");
			String currTime = TenpayUtil.getCurrTime();
			//8位日期
			String strTime = currTime.substring(8, currTime.length());
			//四位随机数
			String strRandom = TenpayUtil.buildRandom(4) + "";
			//10位序列号,可以自行调整。
			String strReq = strTime + strRandom;		
			//商户号
			String mch_id = partner;
			//子商户号  非必输
			//String sub_mch_id="";
			//设备号   非必输
			String device_info="";
			//随机数 
			String nonce_str = strReq;
			String body = order.getName();
			//附加数据
			String attach = userId;
			//商户订单号
			String out_trade_no = order.getSn()+"|"+System.currentTimeMillis();//订单编号加时间戳
			int intMoney = Integer.parseInt(finalmoney);			
			//总金额以分为单位，不带小数点
			String total_fee = String.valueOf(intMoney);
			//订单生成的机器 IP
			String spbill_create_ip = request.getRemoteAddr();
            String notify_url =WeixinPayConstants.notify_url;//微信异步通知地址			
			String trade_type = "APP";//app支付必须填写为APP
                        //对以下字段进行签名
            SortedMap packageParams = new TreeMap();
			packageParams.put("appid", appid);  
			packageParams.put("attach", attach); 
			packageParams.put("body", body);  
			packageParams.put("mch_id", mch_id);  	
			packageParams.put("nonce_str", nonce_str);  
			packageParams.put("notify_url", notify_url);  
			packageParams.put("out_trade_no", out_trade_no);  	
			packageParams.put("spbill_create_ip", spbill_create_ip); 
			packageParams.put("total_fee", total_fee);
			packageParams.put("trade_type", trade_type);  
			RequestHandler reqHandler = new RequestHandler(request, response);
			reqHandler.init(appid, appsecret, partnerkey);		
			String sign = reqHandler.createSign(packageParams);//获取签名
			String xml=""+
					""+appid+""+
					""+attach+""+
					""+
					""+mch_id+""+
					""+nonce_str+""+
					""+notify_url+""+
					""+out_trade_no+""+
					""+spbill_create_ip+""+
					""+total_fee+""+
					""+trade_type+""+
					""+sign+""+
					"";
			String allParameters = "";
			try {
				allParameters =  reqHandler.genPackage(packageParams);
			 } catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			String createOrderURL = WeixinPayConstants.createOrderURL;
			String prepay_id="";
			try {
				prepay_id = new GetWxOrderno().getPayNo(createOrderURL, xml);
				if(prepay_id.equals("")){
				retMsgJson.put("msg", "error");
				json=retMsgJson.toString();					
			    out.write(json);
				out.close();
				return;
				 }
			} catch (Exception e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			 }
                        //获取到prepayid后对以下字段进行签名最终发送给app
                       SortedMap finalpackage = new TreeMap();
			String timestamp = Sha1Util.getTimeStamp();
			finalpackage.put("appid", appid);  
			finalpackage.put("timestamp", timestamp);  
			finalpackage.put("noncestr", nonce_str);  
			finalpackage.put("partnerid", WeixinPayConstants.partner); 
			finalpackage.put("package", "Sign=WXPay");  			
			finalpackage.put("prepayid", prepay_id);  
  			String finalsign = reqHandler.createSign(finalpackage);
			        retMsgJson.put("msg", "ok");
					retMsgJson.put("appid", appid);
					retMsgJson.put("timestamp", timestamp);
					retMsgJson.put("noncestr", nonce_str);
					retMsgJson.put("partnerid", WeixinPayConstants.partner);
					retMsgJson.put("prepayid", prepay_id);
					retMsgJson.put("package", "Sign=WXPay");
					retMsgJson.put("sign", finalsign);
					json=retMsgJson.toString();					
			        out.write(json);
			        out.close();
}
//微信异步通知
@RequestMapping(value = "/notify") 
@ResponseBody public void notify(HttpServletRequest request,HttpServletResponse response) throws Exception{
	request.setCharacterEncoding("UTF-8");
	response.setCharacterEncoding("UTF-8");
	response.setContentType("text/html;charset=UTF-8");
	response.setHeader("Access-Control-Allow-Origin", "*"); 
    InputStream in=request.getInputStream();
    ByteArrayOutputStream out=new ByteArrayOutputStream();
    byte[] buffer =new byte[1024];
    int len=0;
    while((len=in.read(buffer))!=-1){
    	out.write(buffer, 0, len);
    }
    out.close();
    in.close();
    String msgxml=new String(out.toByteArray(),"utf-8");//xml数据
    System.out.println(msgxml);   
    Map map =  new GetWxOrderno().doXMLParse(msgxml);
    String result_code=(String) map.get("result_code");
    String out_trade_no  = (String) map.get("out_trade_no");
    String total_fee  = (String) map.get("total_fee");
    String sign  = (String) map.get("sign");
    Double amount=new Double(total_fee)/100;//获取订单金额
    String attach= (String) map.get("attach");
    String sn=out_trade_no.split("\\|")[0];//获取订单编号
    Long memberid=Long.valueOf(attach);
    Member member=memberService.find(memberid);
	Order order=orderService.findBySn(sn);
	if(result_code.equals("SUCCESS")&&member!=null&&order!=null){
	  //验证签名
		float sessionmoney = Float.parseFloat(order.getAmount().toString());
		String finalmoney = String.format("%.2f", sessionmoney);
		finalmoney = finalmoney.replace(".", "");
		int intMoney = Integer.parseInt(finalmoney);			
		//总金额以分为单位，不带小数点
	    String order_total_fee = String.valueOf(intMoney);
	    String fee_type  = (String) map.get("fee_type");
	    String bank_type  = (String) map.get("bank_type");
	    String cash_fee  = (String) map.get("cash_fee");
        String is_subscribe  = (String) map.get("is_subscribe");
	    String nonce_str  = (String) map.get("nonce_str");
	    String openid  = (String) map.get("openid");
	    String return_code  = (String) map.get("return_code");
	    String sub_mch_id  = (String) map.get("sub_mch_id");
	    String time_end  = (String) map.get("time_end");
	    String trade_type  = (String) map.get("trade_type");
	    String transaction_id  = (String) map.get("transaction_id");
                //需要对以下字段进行签名
        SortedMap packageParams = new TreeMap();
		packageParams.put("appid", appid);  
		packageParams.put("attach", order.getMember().getId().toString()); //用自己系统的数据：会员id
		packageParams.put("bank_type", bank_type);  
		packageParams.put("cash_fee", cash_fee);  
		packageParams.put("fee_type", fee_type);  	
   		packageParams.put("is_subscribe", is_subscribe);  
		packageParams.put("mch_id", partner);  
		packageParams.put("nonce_str", nonce_str);  	
		packageParams.put("openid", openid); 
		packageParams.put("out_trade_no", out_trade_no);
 		packageParams.put("result_code", result_code);  
		packageParams.put("return_code", return_code);  	
 		packageParams.put("sub_mch_id", sub_mch_id); 
		packageParams.put("time_end", time_end);
		packageParams.put("total_fee", order_total_fee);	//用自己系统的数据：订单金额
		packageParams.put("trade_type", trade_type); 
		packageParams.put("transaction_id", transaction_id);
		RequestHandler reqHandler = new RequestHandler(request, response);
		reqHandler.init(appid, appsecret, partnerkey);		
		String endsign = reqHandler.createSign(packageParams);
		if(sign.equals(endsign)){//验证签名是否正确  官方签名工具地址：https://pay.weixin.qq.com/wiki/tools/signverify/ 
			if("订单没有支付"){
				try{
				//处理自己的业务逻辑
				response.getWriter().write(setXml("SUCCESS", "OK"));	//告诉微信已经收到通知了
				}catch(Exception e){
					System.out.println("微信支付异步通知异常");
				}
			}else if("订单支付了"){
				response.getWriter().write(setXml("SUCCESS", "OK"));	//告诉微信已经收到通知了
			}
	
		}
	}
    }
	public static String setXml(String return_code,String return_msg){
		return "";
}
}
 

附上本文微信app支付开发所用到的工具类下载地址
http://download.csdn.net/detail/xu_xiao_ji/9516695