/**
* 统一下单请求参数(必填)
* @author Y
*
*/
public class UnifiedOrderRequest {
private String appid; //公众账号ID
private String mch_id; //商户号
private String nonce_str; //随机字符串
private String sign; //签名
private String body; //商品描述
private String out_trade_no; <span style="white-space:pre"> </span>//商户订单号
private String total_fee; //总金额
private String spbill_create_ip; <span style="white-space:pre"> </span>//终端IP
private String notify_url; //通知地址
private String trade_type; //交易类型
}UnifiedOrderRequestExt.class/**
* 统一下单请求参数(非必填)
* @author Y
*
*/
public class UnifiedOrderRequestExt extends UnifiedOrderRequest{
private String device_info; //设备号
private String detail; //商品详情
private String attach; //附加数据
private String fee_type; //货币类型
private String time_start; //交易起始时间
private String time_expire; //交易结束时间
private String goods_tag; //商品标记
private String product_id; //商品ID
private String limit_pay; //指定支付方式
private String openid; //用户标识
}UnifiedOrderRespose.class/**
* 统一下单返回参数
* @author Y
*
*/
public class UnifiedOrderRespose {
private String return_code; //返回状态码
private String return_msg; //返回信息
private String appid; //公众账号ID
private String mch_id; //商户号
private String device_info; //设备号
private String nonce_str; //随机字符串
private String sign; //签名
private String result_code; //业务结果
private String err_code; //错误代码
private String err_code_des; <span style="white-space:pre"> </span>//错误代码描述
private String trade_type; //交易类型
private String prepay_id; //预支付交易会话标识
private String code_url; //二维码链接
} /**
* 创建二维码
*/
@RequestMapping("createQRCode")
public void createQRCode(String orderId, HttpServletResponse response) {
//生成订单
String orderInfo = createOrderInfo(orderId);
//调统一下单API
String code_url = httpOrder(orderInfo);
//将返回预支付交易链接（code_url）生成二维码图片
//这里使用的是zxing <span style="color:#ff0000;"><strong>说明1(见文末)</strong></span>
try {
int width = 200;
int height = 200;
String format = "png";
Hashtable hints = new Hashtable();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
BitMatrix bitMatrix = new MultiFormatWriter().encode(code_url, BarcodeFormat.QR_CODE, width, height, hints);
OutputStream out = null;
out = response.getOutputStream();
MatrixToImageWriter.writeToStream(bitMatrix, format, out);
out.flush();
out.close();
} catch (Exception e) {
}
} /**
* 生成订单
* @param orderId
* @return
*/
private String createOrderInfo(String orderId) {
//生成订单对象
UnifiedOrderRequest unifiedOrderRequest = new UnifiedOrderRequest();
unifiedOrderRequest.setAppid("xxxxxxxxxxxxx");//公众账号ID
unifiedOrderRequest.setMch_id("xxxxxxxxx");//商户号
unifiedOrderRequest.setNonce_str(StringUtil.makeUUID());//随机字符串 <span style="color:#ff0000;"><strong>说明2(见文末)</strong></span>
unifiedOrderRequest.setBody("xxxxxx");//商品描述
unifiedOrderRequest.setOut_trade_no(orderId);//商户订单号
unifiedOrderRequest.setTotal_fee("x"); //金额需要扩大100倍:1代表支付时是0.01
unifiedOrderRequest.setSpbill_create_ip("xxxxxxxxxxxxx");//终端IP
unifiedOrderRequest.setNotify_url("xxxxxxxxxxxxxx");//通知地址
unifiedOrderRequest.setTrade_type("NATIVE");//JSAPI--公众号支付、NATIVE--原生扫码支付、APP--app支付
unifiedOrderRequest.setSign(createSign(unifiedOrderRequest));//签名<span style="color:#ff0000;"><strong>说明5(见文末，签名方法一并给出)</strong></span>
//将订单对象转为xml格式
XStream xStream = new XStream(new XppDriver(new XmlFriendlyNameCoder("_-", "_"))); //<span style="color:#ff0000;"><strong>说明3(见文末)</strong></span>
xStream.alias("xml", UnifiedOrderRequest.class);//根元素名需要是xml
return xStream.toXML(unifiedOrderRequest);
} /**
* 调统一下单API
* @param orderInfo
* @return
*/
private String httpOrder(String orderInfo) {
String url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
try {
HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();
//加入数据
conn.setRequestMethod("POST");
conn.setDoOutput(true);
BufferedOutputStream buffOutStr = new BufferedOutputStream(conn.getOutputStream());
buffOutStr.write(orderInfo.getBytes());
buffOutStr.flush();
buffOutStr.close();
//获取输入流
BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line = null;
StringBuffer sb = new StringBuffer();
while((line = reader.readLine())!= null){
sb.append(line);
}
XStream xStream = new XStream(new XppDriver(new XmlFriendlyNameCoder("_-", "_")));//说明3(见文末)
//将请求返回的内容通过xStream转换为UnifiedOrderRespose对象
xStream.alias("xml", UnifiedOrderRespose.class);
UnifiedOrderRespose unifiedOrderRespose = (UnifiedOrderRespose) xStream.fromXML(sb.toString());
//根据微信文档return_code 和result_code都为SUCCESS的时候才会返回code_url
//<span style="color:#ff0000;"><strong>说明4(见文末)</strong></span>
if(null!=unifiedOrderRespose
&& "SUCCESS".equals(unifiedOrderRespose.getReturn_code())
&& "SUCCESS".equals(unifiedOrderRespose.getResult_code())){
return unifiedOrderRespose.getCode_url();
}else{
return null;
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}<img src="${ctx}/wxPay/createQRCode?orderId=1111" width="174px">
/**
* 创建UUID
* @return
*/
public static synchronized String makeUUID() {
Date date = new Date();
StringBuffer s = new StringBuffer(DateUtil.formatYmdhmsm(date));
return s.append((new Random().nextInt(900) + 100)).toString();
}
/**
* 生成签名
*
* @param appid_value
* @param mch_id_value
* @param productId
* @param nonce_str_value
* @param trade_type
* @param notify_url
* @param spbill_create_ip
* @param total_fee
* @param out_trade_no
* @return
*/
private String createSign(UnifiedOrderRequest unifiedOrderRequest) {
//根据规则创建可排序的map集合
SortedMap<String, String> packageParams = new TreeMap<String, String>();
packageParams.put("appid", unifiedOrderRequest.getAppid());
packageParams.put("body", unifiedOrderRequest.getBody());
packageParams.put("mch_id", unifiedOrderRequest.getMch_id());
packageParams.put("nonce_str", unifiedOrderRequest.getNonce_str());
packageParams.put("notify_url", unifiedOrderRequest.getNotify_url());
packageParams.put("out_trade_no", unifiedOrderRequest.getOut_trade_no());
packageParams.put("spbill_create_ip", unifiedOrderRequest.getSpbill_create_ip());
packageParams.put("trade_type", unifiedOrderRequest.getTrade_type());
packageParams.put("total_fee", unifiedOrderRequest.getTotal_fee());
StringBuffer sb = new StringBuffer();
Set es = packageParams.entrySet();//字典序
Iterator it = es.iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
String k = (String) entry.getKey();
String v = (String) entry.getValue();
//为空不参与签名、参数名区分大小写
if (null != v && !"".equals(v) && !"sign".equals(k)
&& !"key".equals(k)) {
sb.append(k + "=" + v + "&");
}
}
//第二步拼接key，key设置路径：微信商户平台(pay.weixin.qq.com)-->账户设置-->API安全-->密钥设置
sb.append("key=" +"xxxxxxxxxxxxxxxxx");
String sign = MD5Util.MD5Encode(sb.toString(), "utf-8")
.toUpperCase();//MD5加密
return sign;
}微信：微信扫码支付、调用统一下单接口、网站支付 + springmvc
原文：http://blog.csdn.net/u010246789/article/details/51554021