java微信小程式支付完整流程
阿新 • • 發佈:2019-01-10
用到的jar包就不貼了
1、小程式內呼叫登入介面,獲取到使用者的openid,api參見公共api【小程式登入API】
public String getOpenId(String code) throws BusinessException { try { //登入憑證校驗 String loginValidataUrl = "https://api.weixin.qq.com/sns/jscode2session?appid="+appid+"&secret="+appsecret+"&js_code="+code+"&grant_type=authorization_code"; Connection conn = Jsoup.connect(loginValidataUrl); conn.method(Method.GET).execute(); int status = conn.response().statusCode();//200成功 if (status!=200) { //拋異常 throw new Exception(EWxError.WX_GET_OPENID_ERROR.getName()); } String body = conn.response().body(); return body; } catch (Exception e) { log.error(EWxError.WX_GET_OPENID_ERROR.getName(),e); throw new BusinessException(EWxError.WX_GET_OPENID_ERROR.getName()); } }
用到的實體類PaymentPo.java
package com.wdwl.changfa.po; import java.io.Serializable; import lombok.Data; /** * 小程式支付 * @author lhy * */ @Data public class PaymentPo implements Serializable{ /** * */ private static final long serialVersionUID = 1712467669291115101L; private String appid;//小程式ID private String mch_id;//商戶號 private String device_info;//裝置號 private String nonce_str;//隨機字串 private String sign;//簽名 private String body;//商品描述 private String detail;//商品詳情 private String attach;//附加資料 private String out_trade_no;//商戶訂單號 private String fee_type;//貨幣型別 private String spbill_create_ip;//終端IP private String time_start;//交易起始時間 private String time_expire;//交易結束時間 private String goods_tag;//商品標記 private String total_fee;//總金額 private String notify_url;//通知地址 private String trade_type;//交易型別 private String limit_pay;//指定支付方式 private String openid;//使用者標識 private String code;//使用者標識 private String placeId;//使用者標識 private Integer carSum;//使用者購買了多少次 private Integer type;//使用者購卡型別 }
2、商戶server呼叫支付統一下單,api參見公共api【統一下單API】
3、商戶server呼叫再次簽名,api參見公共api【再次簽名】
2和3寫在一起了
注意:小程式金額不是元,單位是分(如:100=1元)
@SuppressWarnings("rawtypes") private Map<String, String> goPay(PaymentPo paymentPo) throws Exception { //商品名稱 //String body = "測試商品名稱"; //金額元=paymentPo.getTotal_fee()*100 String total_fee = String.valueOf(new BigDecimal(paymentPo.getTotal_fee()).multiply(new BigDecimal(100)).intValue()); //組裝引數,使用者生成統一下單介面的簽名 Map<String, String> packageParams = new HashMap<String, String>(); packageParams.put("appid", appid); packageParams.put("mch_id", mchId); packageParams.put("nonce_str", paymentPo.getNonce_str()); packageParams.put("body", paymentPo.getBody()); packageParams.put("out_trade_no", paymentPo.getOut_trade_no());//商戶訂單號 packageParams.put("total_fee", total_fee);//支付金額,這邊需要轉成字串型別,否則後面的簽名會失敗 packageParams.put("notify_url", paymentPo.getNotify_url());//支付成功後的回撥地址 packageParams.put("trade_type", tradeType);//支付方式 packageParams.put("openid", paymentPo.getOpenid()); String prestr = PayUtil.createLinkString(packageParams); // 把陣列所有元素,按照“引數=引數值”的模式用“&”字元拼接成字串 //MD5運算生成簽名,這裡是第一次簽名,用於呼叫統一下單介面 String mysign = PayUtil.sign(prestr, key, "utf-8").toUpperCase(); //拼接統一下單介面使用的xml資料,要將上一步生成的簽名一起拼接進去 String xml = "<xml>" + "<appid>" + appid + "</appid>" + "<body><![CDATA[" + paymentPo.getBody() + "]]></body>" + "<mch_id>" + mchId + "</mch_id>" + "<nonce_str>" + paymentPo.getNonce_str() + "</nonce_str>" + "<notify_url>" + paymentPo.getNotify_url() + "</notify_url>" + "<openid>" + paymentPo.getOpenid() + "</openid>" + "<out_trade_no>" + paymentPo.getOut_trade_no() + "</out_trade_no>" /* + "<spbill_create_ip>" + paymentPo.getSpbill_create_ip() + "</spbill_create_ip>" */ + "<total_fee>" + total_fee + "</total_fee>" + "<trade_type>" + tradeType + "</trade_type>" + "<sign>" + mysign + "</sign>" + "</xml>"; log.info("除錯模式_統一下單介面 請求XML資料:" + xml); //呼叫統一下單介面,並接受返回的結果 String res = PayUtil.httpRequest(payUrl, "POST", xml); log.info("除錯模式_統一下單介面 返回XML資料:" + res); // 將解析結果儲存在HashMap中 Map map = PayUtil.doXMLParse(res); String return_code = (String) map.get("return_code");//返回狀態碼 Map<String, String> result = new HashMap<String, String>();//返回給小程式端需要的引數 String prepay_id = null; if(return_code=="SUCCESS"||return_code.equals(return_code)){ prepay_id = (String) map.get("prepay_id");//返回的預付單資訊 result.put("nonceStr", paymentPo.getNonce_str()); result.put("package", "prepay_id=" + prepay_id); Long timeStamp = System.currentTimeMillis() / 1000; result.put("timeStamp", timeStamp + "");//這邊要將返回的時間戳轉化成字串,不然小程式端呼叫wx.requestPayment方法會報簽名錯誤 //拼接簽名需要的引數 String stringSignTemp = "appId=" + appid + "&nonceStr=" + paymentPo.getNonce_str() + "&package=prepay_id=" + prepay_id+ "&signType=MD5&timeStamp=" + timeStamp; //再次簽名,這個簽名用於小程式端呼叫wx.requesetPayment方法 String paySign = PayUtil.sign(stringSignTemp, key, "utf-8").toUpperCase(); result.put("paySign", paySign); } result.put("appid", appid); return result; }
4、商戶server接收支付通知,api參見公共api【支付結果通知API】即支付回撥通知
此步驟未測,專案未上線無法測試。有測試成功的可以留個言
/**
* 支付回撥
* @param request
* @param response
* @throws InterruptedException
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@RequestMapping(value="/pay/notify")
public synchronized void notify(HttpServletRequest request,HttpServletResponse response) throws InterruptedException{
String orderId = null;
try {
BufferedReader br = new BufferedReader(new InputStreamReader((ServletInputStream)request.getInputStream()));
String line = null;
StringBuilder sb = new StringBuilder();
while((line = br.readLine()) != null){
sb.append(line);
}
br.close();
//sb為微信返回的xml
String notityXml = sb.toString();
String resXml = "";
log.info("接收到的報文:" + notityXml);
Map map = PayUtil.doXMLParse(notityXml);
String returnCode = (String) map.get("return_code");
if("SUCCESS".equals(returnCode)){
//驗證簽名是否正確
Map<String, String> validParams = PayUtil.paraFilter(map); //回撥驗籤時需要去除sign和空值引數
String validStr = PayUtil.createLinkString(validParams);//把陣列所有元素,按照“引數=引數值”的模式用“&”字元拼接成字串
String sign = PayUtil.sign(validStr, key, "utf-8").toUpperCase();//拼裝生成伺服器端驗證的簽名
//根據微信官網的介紹,此處不僅對回撥的引數進行驗籤,還需要對返回的金額與系統訂單的金額進行比對等
if(sign.equals(map.get("sign"))){
/**此處新增自己的業務邏輯程式碼start**/
//TODO
/**此處新增自己的業務邏輯程式碼end**/
//通知微信伺服器已經支付成功
resXml = this.getXml();
}
}else{
resXml = this.getFailXml();
}
log.info(resXml);
log.info("微信支付回撥資料結束");
BufferedOutputStream out = new BufferedOutputStream(
response.getOutputStream());
out.write(resXml.getBytes());
out.flush();
out.close();
} catch (Exception e) {
log.error(EPayError.PAY_NOTIFY_ERROR.getName(),orderId,e);
}
}
PayUtil.java
package com.wdwl.changfa.utils.pay;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.security.SignatureException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.apache.commons.codec.digest.DigestUtils;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
public class PayUtil {
/**
* 簽名字串
* @param text需要簽名的字串
* @param key 金鑰
* @param input_charset編碼格式
* @return 簽名結果
*/
public static String sign(String text, String key, String input_charset) {
text = text + "&key=" + key;
return DigestUtils.md5Hex(getContentBytes(text, input_charset));
}
/**
* 簽名字串
* @param text需要簽名的字串
* @param sign 簽名結果
* @param key金鑰
* @param input_charset 編碼格式
* @return 簽名結果
*/
public static boolean verify(String text, String sign, String key, String input_charset) {
text = text + key;
String mysign = DigestUtils.md5Hex(getContentBytes(text, input_charset));
if (mysign.equals(sign)) {
return true;
} else {
return false;
}
}
/**
* @param content
* @param charset
* @return
* @throws SignatureException
* @throws UnsupportedEncodingException
*/
public static byte[] getContentBytes(String content, String charset) {
if (charset == null || "".equals(charset)) {
return content.getBytes();
}
try {
return content.getBytes(charset);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException("MD5簽名過程中出現錯誤,指定的編碼集不對,您目前指定的編碼集是:" + charset);
}
}
private static boolean isValidChar(char ch) {
if ((ch >= '0' && ch <= '9') || (ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z'))
return true;
if ((ch >= 0x4e00 && ch <= 0x7fff) || (ch >= 0x8000 && ch <= 0x952f))
return true;// 簡體中文漢字編碼
return false;
}
/**
* 除去陣列中的空值和簽名引數
* @param sArray 簽名引數組
* @return 去掉空值與簽名引數後的新簽名引數組
*/
public static Map<String, String> paraFilter(Map<String, String> sArray) {
Map<String, String> result = new HashMap<String, String>();
if (sArray == null || sArray.size() <= 0) {
return result;
}
for (String key : sArray.keySet()) {
String value = sArray.get(key);
if (value == null || value.equals("") || key.equalsIgnoreCase("sign")
|| key.equalsIgnoreCase("sign_type")) {
continue;
}
result.put(key, value);
}
return result;
}
/**
* 把陣列所有元素排序,並按照“引數=引數值”的模式用“&”字元拼接成字串
* @param params 需要排序並參與字元拼接的引數組
* @return 拼接後字串
*/
public static String createLinkString(Map<String, String> params) {
List<String> keys = new ArrayList<String>(params.keySet());
Collections.sort(keys);
String prestr = "";
for (int i = 0; i < keys.size(); i++) {
String key = keys.get(i);
String value = params.get(key);
if (i == keys.size() - 1) {// 拼接時,不包括最後一個&字元
prestr = prestr + key + "=" + value;
} else {
prestr = prestr + key + "=" + value + "&";
}
}
return prestr;
}
/**
*
* @param requestUrl請求地址
* @param requestMethod請求方法
* @param outputStr引數
*/
public static String httpRequest(String requestUrl,String requestMethod,String outputStr){
// 建立SSLContext
StringBuffer buffer = null;
try{
URL url = new URL(requestUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod(requestMethod);
conn.setDoOutput(true);
conn.setDoInput(true);
conn.connect();
//往伺服器端寫內容
if(null !=outputStr){
OutputStream os=conn.getOutputStream();
os.write(outputStr.getBytes("utf-8"));
os.close();
}
// 讀取伺服器端返回的內容
InputStream is = conn.getInputStream();
InputStreamReader isr = new InputStreamReader(is, "utf-8");
BufferedReader br = new BufferedReader(isr);
buffer = new StringBuffer();
String line = null;
while ((line = br.readLine()) != null) {
buffer.append(line);
}
br.close();
}catch(Exception e){
e.printStackTrace();
}
return buffer.toString();
}
public static String urlEncodeUTF8(String source){
String result=source;
try {
result=java.net.URLEncoder.encode(source, "UTF-8");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return result;
}
/**
* 解析xml,返回第一級元素鍵值對。如果第一級元素有子節點,則此節點的值是子節點的xml資料。
* @param strxml
* @return
* @throws JDOMException
* @throws IOException
*/
public static Map doXMLParse(String strxml) throws Exception {
if(null == strxml || "".equals(strxml)) {
return null;
}
Map m = new HashMap();
InputStream in = String2Inputstream(strxml);
SAXBuilder builder = new SAXBuilder();
Document doc = builder.build(in);
Element root = doc.getRootElement();
List list = root.getChildren();
Iterator it = list.iterator();
while(it.hasNext()) {
Element e = (Element) it.next();
String k = e.getName();
String v = "";
List children = e.getChildren();
if(children.isEmpty()) {
v = e.getTextNormalize();
} else {
v = getChildrenText(children);
}
m.put(k, v);
}
//關閉流
in.close();
return m;
}
/**
* 獲取子結點的xml
* @param children
* @return String
*/
public static String getChildrenText(List children) {
StringBuffer sb = new StringBuffer();
if(!children.isEmpty()) {
Iterator it = children.iterator();
while(it.hasNext()) {
Element e = (Element) it.next();
String name = e.getName();
String value = e.getTextNormalize();
List list = e.getChildren();
sb.append("<" + name + ">");
if(!list.isEmpty()) {
sb.append(getChildrenText(list));
}
sb.append(value);
sb.append("</" + name + ">");
}
}
return sb.toString();
}
public static InputStream String2Inputstream(String str) {
return new ByteArrayInputStream(str.getBytes());
}
}
做個記錄。程式碼有漏掉的可以加Q739568808.