java微信小程式呼叫支付介面
阿新 • • 發佈:2019-02-01
簡介:微信小程式支付這裡的坑還是有的,所以提醒各位在編寫的一定要注意!!!
1.首先呢,你需要準備openid,appid,還有申請微信支付後要設定一個32位的金鑰,需要先生成一個sign,得到prepay_id,然後再得到一個paySign,總之就是很墨跡,下面獻上我的controller
//微信下單支付
@ResponseBody
@RequestMapping("doOrder")
public void doOrder(HttpServletRequest request, HttpServletResponse response) throws IOException, JDOMException {
request.setCharacterEncoding ("UTF-8");
response.setCharacterEncoding("UTF-8");
//得到openid
String openid = request.getParameter("openid");
int fee = 0;
//得到小程式傳過來的價格,注意這裡的價格必須為整數,1代表1分,所以傳過來的值必須*100;
if (null != request.getParameter("price")) {
fee = Integer.parseInt(request.getParameter ("price").toString());
}
System.out.println(request.getParameter("price"));
System.out.println(fee);
//訂單編號
String did = request.getParameter("did");
//訂單標題
String title = request.getParameter("title");
//時間戳
String times = System.currentTimeMillis () + "";
SortedMap<Object, Object> packageParams = new TreeMap<Object, Object>();
packageParams.put("appid", "wxa**********2e2");
packageParams.put("mch_id", "1486425722");
packageParams.put("nonce_str", times);//時間戳
packageParams.put("body", title);//支付主體
packageParams.put("out_trade_no", did);//編號
packageParams.put("total_fee", fee);//價格
// packageParams.put("spbill_create_ip", getIp2(request));這裡之前加了ip,但是總是獲取sign失敗,原因不明,之後就註釋掉了
packageParams.put("notify_url", base+"/notify");//支付返回地址,不用糾結這個東西,我就是隨便寫了一個介面,內容什麼都沒有
packageParams.put("trade_type", "JSAPI");//這個api有,固定的
packageParams.put("openid", openid);//openid
//獲取sign
String sign = PayCommonUtil.createSign("UTF-8", packageParams, "x********************************4");//最後這個是自己設定的32位金鑰
packageParams.put("sign", sign);
//轉成XML
String requestXML = PayCommonUtil.getRequestXml(packageParams);
System.out.println(requestXML);
//得到含有prepay_id的XML
String resXml = HttpUtil.postData("https://api.mch.weixin.qq.com/pay/unifiedorder", requestXML);
System.out.println(resXml);
//解析XML存入Map
Map map = XMLUtil.doXMLParse(resXml);
System.out.println(map);
// String return_code = (String) map.get("return_code");
//得到prepay_id
String prepay_id = (String) map.get("prepay_id");
SortedMap<Object, Object> packageP = new TreeMap<Object, Object>();
packageP.put("appId", "wxa**********2e2");//!!!注意,這裡是appId,上面是appid,真懷疑寫這個東西的人。。。
packageP.put("nonceStr", times);//時間戳
packageP.put("package", "prepay_id=" + prepay_id);//必須把package寫成 "prepay_id="+prepay_id這種形式
packageP.put("signType", "MD5");//paySign加密
packageP.put("timeStamp", (System.currentTimeMillis() / 1000) + "");
//得到paySign
String paySign = PayCommonUtil.createSign("UTF-8", packageP, "x********************************4");
packageP.put("paySign", paySign);
//將packageP資料返回給小程式
Gson gson = new Gson();
String json = gson.toJson(packageP);
PrintWriter pw = response.getWriter();
System.out.println(json);
pw.write(json);
pw.close();
}
2.下面是需要用到的工具類
(1).生成sign以及得到sign後生成XML工具類PayCommonUtil
public class PayCommonUtil {
/**
* 是否簽名正確,規則是:按引數名稱a-z排序,遇到空值的引數不參加簽名。
* @return boolean
*/
public static boolean isTenpaySign(String characterEncoding, SortedMap<Object, Object> packageParams, String API_KEY) {
StringBuffer sb = new StringBuffer();
Set es = packageParams.entrySet();
Iterator it = es.iterator();
while(it.hasNext()) {
Map.Entry entry = (Map.Entry)it.next();
String k = (String)entry.getKey();
String v = (String)entry.getValue();
if(!"sign".equals(k) && null != v && !"".equals(v)) {
sb.append(k + "=" + v + "&");
}
}
sb.append("key=" + API_KEY);
//算出摘要
String mysign = MD5.MD5Encode(sb.toString(), characterEncoding).toLowerCase();
String tenpaySign = ((String)packageParams.get("sign")).toLowerCase();
//System.out.println(tenpaySign + " " + mysign);
return tenpaySign.equals(mysign);
}
/**
* @author
* @Description:sign簽名
* @param characterEncoding
* 編碼格式
* @param parameters
* 請求引數
* @return
*/
public static String createSign(String characterEncoding, SortedMap<Object, Object> packageParams, String API_KEY) {
StringBuffer sb = new StringBuffer();
Set es = packageParams.entrySet();
Iterator it = es.iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
String k = entry.getKey().toString();
String v = entry.getValue().toString();
if (null != v && !"".equals(v) && !"sign".equals(k) && !"key".equals(k)) {
sb.append(k + "=" + v + "&");
}
}
sb.append("key=" + API_KEY);
String sign = MD5.MD5Encode(sb.toString(), characterEncoding).toUpperCase();
return sign;
}
/**
* @author
* @Description:將請求引數轉換為xml格式的string
* @param parameters
* 請求引數
* @return
*/
public static String getRequestXml(SortedMap<Object, Object> parameters) {
StringBuffer sb = new StringBuffer();
sb.append("<xml>");
Set es = parameters.entrySet();
Iterator it = es.iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
String k = entry.getKey().toString();
String v = entry.getValue().toString();
if ("attach".equalsIgnoreCase(k) || "body".equalsIgnoreCase(k) || "sign".equalsIgnoreCase(k)) {
sb.append("<" + k + ">" + "<![CDATA[" + v + "]]></" + k + ">");
} else {
sb.append("<" + k + ">" + v + "</" + k + ">");
}
}
sb.append("</xml>");
return sb.toString();
}
/**
* 取出一個指定長度大小的隨機正整數.
*
* @param length
* int 設定所取出隨機數的長度。length小於11
* @return int 返回生成的隨機數。
*/
public static int buildRandom(int length) {
int num = 1;
double random = Math.random();
if (random < 0.1) {
random = random + 0.1;
}
for (int i = 0; i < length; i++) {
num = num * 10;
}
return (int) ((random * num));
}
/**
* 獲取當前時間 yyyyMMddHHmmss
*
* @return String
*/
public static String getCurrTime() {
Date now = new Date();
SimpleDateFormat outFormat = new SimpleDateFormat("yyyyMMddHHmmss");
String s = outFormat.format(now);
return s;
}
}
(2).訪問官方介面得到含有prepay_id的XML工具類HttpUtil
public class HttpUtil {
//private static final Log logger = Logs.get();
private final static int CONNECT_TIMEOUT = 5000; // in milliseconds
private final static String DEFAULT_ENCODING = "UTF-8";
public static String postData(String urlStr, String data){
return postData(urlStr, data, null);
}
public static String postData(String urlStr, String data, String contentType){
BufferedReader reader = null;
try {
URL url = new URL(urlStr);
URLConnection conn = url.openConnection();
conn.setDoOutput(true);
conn.setConnectTimeout(CONNECT_TIMEOUT);
conn.setReadTimeout(CONNECT_TIMEOUT);
if(contentType != null)
conn.setRequestProperty("content-type", contentType);
OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream(), DEFAULT_ENCODING);
if(data == null)
data = "";
writer.write(data);
writer.flush();
writer.close();
reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), DEFAULT_ENCODING));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line);
sb.append("\r\n");
}
return sb.toString();
} catch (IOException e) {
//logger.error("Error connecting to " + urlStr + ": " + e.getMessage());
} finally {
try {
if (reader != null)
reader.close();
} catch (IOException e) {
}
}
return null;
}
}
(3).解析XML工具類
public class XMLUtil {
public static Map doXMLParse(String strxml) throws JDOMException, IOException {
strxml = strxml.replaceFirst("encoding=\".*\"", "encoding=\"UTF-8\"");
if(null == strxml || "".equals(strxml)) {
return null;
}
Map m = new HashMap();
InputStream in = new ByteArrayInputStream(strxml.getBytes("UTF-8"));
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 = XMLUtil.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(XMLUtil.getChildrenText(list));
}
sb.append(value);
sb.append("</" + name + ">");
}
}
return sb.toString();
}
}
(4).MD5加密工具類
public class MD5 {
private static String byteArrayToHexString(byte b[]) {
StringBuffer resultSb = new StringBuffer();
for (int i = 0; i < b.length; i++)
resultSb.append(byteToHexString(b[i]));
return resultSb.toString();
}
private static String byteToHexString(byte b) {
int n = b;
if (n < 0)
n += 256;
int d1 = n / 16;
int d2 = n % 16;
return hexDigits[d1] + hexDigits[d2];
}
public static String MD5Encode(String origin, String charsetname) {
String resultString = null;
try {
resultString = new String(origin);
MessageDigest md = MessageDigest.getInstance("MD5");
if (charsetname == null || "".equals(charsetname))
resultString = byteArrayToHexString(md.digest(resultString
.getBytes()));
else
resultString = byteArrayToHexString(md.digest(resultString
.getBytes(charsetname)));
} catch (Exception exception) {
}
return resultString;
}
private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5",
"6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
}
3.小程式支付函式
gopay: function () {
var that = this
wx.request({
url: app.baseurl + 'doOrder',
data: {
'openid': wx.getStorageSync('openids'),
'title': that.data.title,
'did': that.data.did,
'price': that.data.price*100
},
method: 'POST',
header: {
"content-type": 'application/x-www-form-urlencoded'
},
success: function (res) {
console.log(res.data)
console.log(res.data.timeStamp)
console.log(res.data.nonceStr)
console.log(res.data.package)
console.log(res.data.paySign)
wx.requestPayment({
timeStamp: res.data.timeStamp,
nonceStr: res.data.nonceStr,
package: res.data.package,
signType: res.data.signType,
paySign: res.data.paySign,
success: function (res) {
wx.request({
url: app.baseurl+'updateState',
data: {
'did': that.data.did,
},
method: 'GET',
success:function(res){
console.log(res.data)
if(res.data==1){
wx.redirectTo({
url: '../orderDetial/orderDetial?did=' + that.data.did,
})
}
}
})
},
fail: function (res) {
console.log(res)
}
})
}
})
}
結束啦,小程式支付的java後臺就這些。