微信支付的具体实现方法，供大家参考，具体内容如下

工具类(用于在微信支付服务后台生成预支付交易单)

package com.fengdi.lianmeng.zhifu.weixin;import com.fengdi.lianmeng.util.MD5;import java.lang.reflect.Field;import java.util.HashMap;import java.util.Map;/** * * 类说明：除被扫支付场景以外，店铺系统先调用该接口在微信支付服务后台生成预支付交易单， * 返回正确的预支付交易回话标识后再按扫码、JSAPI、APP等不同场景生成交易串调起支付。 * @author 聂枫 * 2016年1月8日上午11:33:21 */public class UnifiedorderReq{ /** * 公众账号ID */ private String appid; /** * 店铺号 */ private String mch_id; /** * 设备号 */ private String device_info; /** * 随机字符串 */ private String nonce_str; /** * 签名 */ private String sign; /** * 商品描述 */ private String body; /** * 商品详情 */ private String detail; /** * 附加数据 */ private String attach; /** * 店铺订单号 */ private String out_trade_no; /** * 货币类型 */ private String fee_type; /** * 总金额 */ private Integer total_fee; /** * 终端IP */ private String spbill_create_ip; /** * 交易起始时间 */ private String time_start; /** * 交易结束时间 */ private String time_expire; /** * 商品标记 */ private String goods_tag; /** * 通知地址 */ private String notify_url; /** * 交易类型 */ private String trade_type; /** * 商品ID */ private String product_id; /** * 指定支付方式 */ private String limit_pay; /** * 用户标识 */ private String openid; public String getAppid() { return appid; } public void setAppid(String appid) { this.appid = appid; } public String getMch_id() { return mch_id; } public void setMch_id(String mch_id) { this.mch_id = mch_id; } public String getDevice_info() { return device_info; } public void setDevice_info(String device_info) { this.device_info = device_info; } public String getNonce_str() { return nonce_str; } public void setNonce_str(String nonce_str) { this.nonce_str = nonce_str; } public String getSign() { return sign; } public void setSign(String sign) { this.sign = sign; } public String getBody() { return body; } public void setBody(String body) { this.body = body.length()>40?body.substring(0, 40):body; } public String getDetail() { return detail; } public void setDetail(String detail) { this.detail = detail; } public String getAttach() { return attach; } public void setAttach(String attach) { this.attach = attach; } public String getOut_trade_no() { return out_trade_no; } public void setOut_trade_no(String out_trade_no) { this.out_trade_no = out_trade_no; } public String getFee_type() { return fee_type; } public void setFee_type(String fee_type) { this.fee_type = fee_type; } public Integer getTotal_fee() { return total_fee; } public void setTotal_fee(Integer total_fee) { this.total_fee = total_fee; } public String getSpbill_create_ip() { return spbill_create_ip; } public void setSpbill_create_ip(String spbill_create_ip) { this.spbill_create_ip = spbill_create_ip; } public String getTime_start() { return time_start; } public void setTime_start(String time_start) { this.time_start = time_start; } public String getTime_expire() { return time_expire; } public void setTime_expire(String time_expire) { this.time_expire = time_expire; } public String getGoods_tag() { return goods_tag; } public void setGoods_tag(String goods_tag) { this.goods_tag = goods_tag; } public String getNotify_url() { return notify_url; } public void setNotify_url(String notify_url) { this.notify_url = notify_url; } public String getTrade_type() { return trade_type; } public void setTrade_type(String trade_type) { this.trade_type = trade_type; } public String getProduct_id() { return product_id; } public void setProduct_id(String product_id) { this.product_id = product_id; } public String getLimit_pay() { return limit_pay; } public void setLimit_pay(String limit_pay) { this.limit_pay = limit_pay; } public String getOpenid() { return openid; } public void setOpenid(String openid) { this.openid = openid; } @Override public String toString() { StringBuilder builder = new StringBuilder(); builder.append("UnifiedorderReq [appid="); builder.append(appid); builder.append(", mch_id="); builder.append(mch_id); builder.append(", device_info="); builder.append(device_info); builder.append(", nonce_str="); builder.append(nonce_str); builder.append(", sign="); builder.append(sign); builder.append(", body="); builder.append(body); builder.append(", detail="); builder.append(detail); builder.append(", attach="); builder.append(attach); builder.append(", out_trade_no="); builder.append(out_trade_no); builder.append(", fee_type="); builder.append(fee_type); builder.append(", total_fee="); builder.append(total_fee); builder.append(", spbill_create_ip="); builder.append(spbill_create_ip); builder.append(", time_start="); builder.append(time_start); builder.append(", time_expire="); builder.append(time_expire); builder.append(", goods_tag="); builder.append(goods_tag); builder.append(", notify_url="); builder.append(notify_url); builder.append(", trade_type="); builder.append(trade_type); builder.append(", product_id="); builder.append(product_id); builder.append(", limit_pay="); builder.append(limit_pay); builder.append(", openid="); builder.append(openid); builder.append("]"); return builder.toString(); } public String toSignString(){ Class<?> clz = this.getClass(); Field[] fields = clz.getDeclaredFields(); StringBuilder builder = new StringBuilder(); for (Field field : fields) { builder.append(field.getName()); } return builder.toString(); } public String signString(){ StringBuilder builder = new StringBuilder(); builder.append("appid="+appid); if(attach!=null){ builder.append("&attach="+attach); } builder.append("&body="+body); builder.append("&mch_id="+mch_id); builder.append("&nonce_str="+nonce_str); builder.append("&notify_url="+notify_url); if(!trade_type.equals("APP")) { builder.append("&openid="+openid); } builder.append("&out_trade_no="+out_trade_no); builder.append("&spbill_create_ip="+spbill_create_ip); builder.append("&total_fee="+total_fee); builder.append("&trade_type="+trade_type); builder.append("&key="+FgWxConfig.mobilekey); return builder.toString(); } public String wapSignString(){ StringBuilder builder = new StringBuilder(); builder.append("appid="+appid); if(attach!=null){ builder.append("&attach="+attach); } builder.append("&body="+body); builder.append("&mch_id="+mch_id); builder.append("&nonce_str="+nonce_str); builder.append("&notify_url="+notify_url); if(!trade_type.equals("APP")) { builder.append("&openid="+openid); } builder.append("&out_trade_no="+out_trade_no); builder.append("&spbill_create_ip="+spbill_create_ip); builder.append("&total_fee="+total_fee); builder.append("&trade_type="+trade_type); builder.append("&key="+FgWxConfig.key); return builder.toString(); } public String toXml(){ return "<xml>" + "<appid>"+appid+"</appid>"+ (attach != null? "<attach>"+attach+"</attach>" : "")+ "<body>"+body+"</body>"+ "<mch_id>"+mch_id+"</mch_id>"+ "<nonce_str>"+nonce_str+"</nonce_str>"+ "<notify_url>"+notify_url+"</notify_url>"+ (trade_type.equals("APP") == true?"":"<openid>"+openid+"</openid>")+ "<out_trade_no>"+out_trade_no+"</out_trade_no>"+ "<spbill_create_ip>"+spbill_create_ip+"</spbill_create_ip>"+ "<total_fee>"+total_fee+"</total_fee>"+ "<trade_type>"+trade_type+"</trade_type>"+ "<sign>"+MD5.encryptByMD5(signString()).toUpperCase()+"</sign>"+ "</xml>"; } public String toWapXml(){ return "<xml>" + "<appid>"+appid+"</appid>"+ (attach != null? "<attach>"+attach+"</attach>" : "")+ "<body>"+body+"</body>"+ "<mch_id>"+mch_id+"</mch_id>"+ "<nonce_str>"+nonce_str+"</nonce_str>"+ "<notify_url>"+notify_url+"</notify_url>"+ (trade_type.equals("APP") == true?"":"<openid>"+openid+"</openid>")+ "<out_trade_no>"+out_trade_no+"</out_trade_no>"+ "<spbill_create_ip>"+spbill_create_ip+"</spbill_create_ip>"+ "<total_fee>"+total_fee+"</total_fee>"+ "<trade_type>"+trade_type+"</trade_type>"+ "<sign>"+MD5.encryptByMD5(wapSignString()).toUpperCase()+"</sign>"+ "</xml>"; } public String signQueryString(String transaction_id){ StringBuilder builder = new StringBuilder(); builder.append("appid="+appid); builder.append("&body="+body); builder.append("&mch_id="+mch_id); builder.append("&nonce_str="+nonce_str); builder.append("&transaction_id="+transaction_id); builder.append("&key="+FgWxConfig.mobilekey); return builder.toString(); } public String toQueryXml(String transaction_id){ StringBuilder sBuilder=new StringBuilder(); sBuilder.append("<xml>"); sBuilder.append("<appid>"+appid+"</appid>"); sBuilder.append("<body>"+body+"</body>"); sBuilder.append("<mch_id>"+mch_id+"</mch_id>"); sBuilder.append("<nonce_str>"+nonce_str+"</nonce_str>"); sBuilder.append("<transaction_id>"+transaction_id+"</transaction_id>"); sBuilder.append("<sign>"+MD5.encryptByMD5(signQueryString(transaction_id)).toUpperCase()+"</sign>"); sBuilder.append("</xml>"); return sBuilder.toString(); } public Map<String,Object> toMap(){ Map<String, Object> params = new HashMap<String, Object>(); params.put("appid", appid); if(attach!=null){ params.put("attach", attach); } params.put("body", body); params.put("mch_id", mch_id); params.put("nonce_str", nonce_str); params.put("notify_url", notify_url); if(!trade_type.equals("APP")) { params.put("openid", openid); } params.put("out_trade_no", out_trade_no); params.put("spbill_create_ip", spbill_create_ip); params.put("total_fee", total_fee); params.put("trade_type", trade_type); params.put("sign", MD5.encryptByMD5(signString()).toUpperCase()); return params; }

组装工具类数据

private AppWeixinPayResponse appUnifiedorderReq(Order order, Member member, HttpServletRequest request) { // 获取支付参数 UnifiedorderReq unifiedorderReq = new UnifiedorderReq(); unifiedorderReq.setBody(order.getOrderName().length() > 50 ? order.getOrderName().substring(0, 50) : order.getOrderName()); log.error(unifiedorderReq.getBody().length() + "--" + unifiedorderReq.getBody()); unifiedorderReq.setAttach(order.getOrderNo()); unifiedorderReq.setTotal_fee(order.getRealAmt().intValue()); unifiedorderReq.setTrade_type("APP");//此处可修改为JSAPI unifiedorderReq.setOut_trade_no(order.getOrderNo() + RandomUtils.nextInt(100, 1000)); unifiedorderReq.setSpbill_create_ip(getIpAddr(request)); unifiedorderReq.setOpenid(member.getOpenid()); return payService.appUnifiedorderReq(unifiedorderReq, PayCategory.order.toString()); }

微信统一下单

public AppWeixinPayResponse appUnifiedorderReq(UnifiedorderReq unifiedorderReq, String payCategory) throws FdServiceException { unifiedorderReq.setAppid(FgWxConfig.appid_app); unifiedorderReq.setMch_id(FgWxConfig.mchId); unifiedorderReq.setNonce_str(Random2Utils.generateString(20)); if (payCategory.equals(PayCategory.order.toString())) { unifiedorderReq.setNotify_url(fgProperties.getDomainUrl() + FgWxConfig.weixinOrderNotifyCallBack); } else if (payCategory.equals(PayCategory.recharge.toString())) { unifiedorderReq.setNotify_url(fgProperties.getDomainUrl() + FgWxConfig.weixinRechargeNotifyCallBack); } else { throw new FdServiceException(ErrorCode.ILLEGAL_ARGUMENT, "微信参数类型[" + payCategory + "]异常"); } unifiedorderReq.setSign(MD5.encryptByMD5(unifiedorderReq.wapSignString()).toUpperCase()); logger.info("unifiedorder返回数据unifiedorderReq：" + unifiedorderReq); String unifiedorder = FgHttp.sendPost(FgWxConfig.unifiedorderUrl, unifiedorderReq.toWapXml()); logger.info("unifiedorder返回数据unifiedorder：" + unifiedorder); AppWeixinPayResponse appWeixinPayResponse = new AppWeixinPayResponse(); try { Map<String, Object> map = XmlHelper.parseResXML(unifiedorder); if ("SUCCESS".equals(map.get("return_code")) && "SUCCESS".equals(map.get("result_code"))) { logger.info("微信统一下单返回成功：" + map); appWeixinPayResponse.setAppid(FgWxConfig.appid_app); appWeixinPayResponse.setNoncestr((String) map.get("nonce_str")); appWeixinPayResponse.setPartnerid(FgWxConfig.mchId); appWeixinPayResponse.setPrepayid((String) map.get("prepay_id")); appWeixinPayResponse.setTimestamp((System.currentTimeMillis() + "").substring(0, 10)); appWeixinPayResponse.setSign(MD5.encryptByMD5(appWeixinPayResponse.wapSignString()).toUpperCase()); } else { logger.info("微信统一下单返回失败：" + map); throw new FdServiceException(ErrorCode.ILLEGAL_ARGUMENT, "微信统一下单返回失败:" + map.get("return_msg")); } } catch (IOException e) { e.printStackTrace(); } catch (ParserConfigurationException e) { e.printStackTrace(); } catch (SAXException e) { e.printStackTrace(); } return appWeixinPayResponse;//直接将参数返回给前端，发起支付 }

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