微信支付集成坑太多！！！
我们支付成功之后，微信会回调我们设置的url，请注意，此url必须是通过外网能够访问的！我们可以通过Natapp映射实现。
收到回调通知之后，我们需要给微信发送消息，告诉微信，我们已经处理完成了，要不然微信会间隔回调接口8次！！
如何告诉他呢，通过下面代码即可：
response.setContentType("text/html;charset=UTF-8");
printWriter = response.getWriter();
final String resultToWX =
"<xml>" +
"<return_code><![CDATA[SUCCESS]]></return_code>" +
"<return_msg><![CDATA[OK]]></return_msg>" +
"</xml>";
printWriter.write(resultToWX);
printWriter.flush();
请注意，如果你是使用Spring MVC框架，那么在控制器返回时，记得返回null，没错就是null，要不然会报getWriter() has already been called for this response 异常。
下面贴一下完整代码，包括微信返回xml信息的解析：
@RequestMapping("resultPay")
public String resultPay(HttpServletResponse response, HttpServletRequest request, @ModelAttribute("e")String e) {
//接受微信返回的信息
InputStream inputStream = null;
BufferedReader reader = null;
OutputStream outputStream = null;
PrintWriter printWriter = null;
try {
inputStream = request.getInputStream();
reader = new BufferedReader(new InputStreamReader(inputStream, OverallCoding.coding));
StringBuilder stringBuilder = new StringBuilder();
String str;
while ((str = reader.readLine()) != null){
stringBuilder.append(str);
}
//对微信返回的xml信息做解析
System.out.println("信息返回:" + stringBuilder.toString());
WXPayResult wxPayResult = WXPayResultHandle.handleResult(stringBuilder.toString());
/**
* wxPayResult是已经处理过得微信返回的信息
* 在这里写结果处理逻辑
*/
//给微信发送通知, 关闭此次支付流程
response.reset();
response.setContentType("text/html;charset=UTF-8");
printWriter = response.getWriter();
final String resultToWX =
"<xml>" +
"<return_code><![CDATA[SUCCESS]]></return_code>" +
"<return_msg><![CDATA[OK]]></return_msg>" +
"</xml>";
printWriter.write(resultToWX);
printWriter.flush();
} catch (IOException e1) {
e1.printStackTrace();
} finally {
try {
if (printWriter != null) printWriter.close();
if (outputStream != null) outputStream.close();
if (reader != null) reader.close();
if (reader != null) inputStream.close();
} catch (IOException e1) {}
}
return null;
}
public static WXPayResult handleResult(String xmlResult){
Document document = null;
try {
document = DocumentHelper.parseText(xmlResult);
//获取根节点元素对象
Element node = document.getRootElement();
// 当前节点下面子节点迭代器
Iterator<Element> it = node.elementIterator();
// 遍历
WXPayResult wxPayResult = new WXPayResult();
while (it.hasNext()) {
Element e = it.next();
if (e.getName() == null) continue;
switch (e.getName()){
case "appid":
wxPayResult.setAppid(e.getText());
break;
case "bank_type":
wxPayResult.setBank_type(e.getText());
break;
case "cash_fee":
wxPayResult.setCash_fee(e.getText());
break;
case "device_info":
wxPayResult.setDevice_info(e.getText());
break;
case "fee_type":
wxPayResult.setFee_type(e.getText());
break;
case "is_subscribe":
wxPayResult.setIs_subscribe(e.getText());
break;
case "mch_id":
wxPayResult.setMch_id(e.getText());
break;
case "nonce_str":
wxPayResult.setNonce_str(e.getText());
break;
case "openid":
wxPayResult.setOpenid(e.getText());
break;
case "out_trade_no":
wxPayResult.setOut_trade_no(e.getText());
break;
case "result_code":
wxPayResult.setResult_code(e.getText());
break;
case "return_code":
wxPayResult.setReturn_code(e.getText());
break;
case "sign":
wxPayResult.setSign(e.getText());
break;
case "time_end":
wxPayResult.setTime_end(e.getText());
break;
case "total_fee":
wxPayResult.setTotal_fee(e.getText());
break;
case "trade_type":
wxPayResult.setTrade_type(e.getText());
break;
case "transaction_id":
wxPayResult.setTransaction_id(e.getText());
break;
default:
continue;
}
}
return wxPayResult;
} catch (DocumentException e) {
e.printStackTrace();
}
return null;
}
public class WXPayResult {
//公众账号id
String appid;
//付款银行
String bank_type;
//现金支付金额
String cash_fee;
//设备号
String device_info;
//货币种类
String fee_type;
//是否关注公众账号
String is_subscribe;
//商户号
String mch_id;
//随机字符串
String nonce_str;
//用户标识
String openid;
//商户订单号
String out_trade_no;
//业务结果
String result_code;
String return_code;
//签名
String sign;
//支付完成时间
String time_end;
//订单金额
String total_fee;
//交易类型
String trade_type;
//微信支付订单号
String transaction_id;
public void setAppid(String appid){
this.appid = appid;
}
public void setBank_type(String bank_type){
this.bank_type = bank_type;
}
public void setCash_fee(String cash_fee) {
this.cash_fee = cash_fee;
}
public void setDevice_info(String device_info) {
this.device_info = device_info;
}
public void setFee_type(String fee_type) {
this.fee_type = fee_type;
}
public void setIs_subscribe(String is_subscribe) {
this.is_subscribe = is_subscribe;
}
public void setMch_id(String mch_id) {
this.mch_id = mch_id;
}
public void setNonce_str(String nonce_str) {
this.nonce_str = nonce_str;
}
public void setOpenid(String openid) {
this.openid = openid;
}
public void setOut_trade_no(String out_trade_no) {
this.out_trade_no = out_trade_no;
}
public void setResult_code(String result_code) {
this.result_code = result_code;
}
public void setReturn_code(String return_code) {
this.return_code = return_code;
}
public void setSign(String sign) {
this.sign = sign;
}
public void setTime_end(String time_end) {
this.time_end = time_end;
}
public void setTotal_fee(String total_fee) {
this.total_fee = total_fee;
}
public void setTrade_type(String trade_type) {
this.trade_type = trade_type;
}
public void setTransaction_id(String transaction_id) {
this.transaction_id = transaction_id;
}
public String getAppid() {
return appid;
}
public String getBank_type() {
return bank_type;
}
public String getCash_fee() {
return cash_fee;
}
public String getDevice_info() {
return device_info;
}
public String getFee_type() {
return fee_type;
}
public String getIs_subscribe() {
return is_subscribe;
}
public String getMch_id() {
return mch_id;
}
public String getNonce_str() {
return nonce_str;
}
public String getOpenid() {
return openid;
}
public String getOut_trade_no() {
return out_trade_no;
}
public String getResult_code() {
return result_code;
}
public String getReturn_code() {
return return_code;
}
public String getSign() {
return sign;
}
public String getTime_end() {
return time_end;
}
public String getTotal_fee() {
return total_fee;
}
public String getTrade_type() {
return trade_type;
}
public String getTransaction_id() {
return transaction_id;
}
}
笔者能力有限，不足之处欢迎指出！
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