JAVA實作微信支付功能-有解無憂

②準備好11個引數JSAPI支付方式

1 配置微信平臺

①配置微信公眾平臺

登錄微信公眾平臺=》公眾號設定=》功能設定=》網頁授權域名

②配置微信商家平臺

①先去官方下載SDK，并導進專案中

2 后臺代碼的實作

JSAPI官方檔案：https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_1

①先去官方下載SDK，并導進專案中

地址：https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=11_1

②準備好11個引數

appid：商家平臺ID，在微信的平臺上有

body：商品描述，

mch_id：商戶ID，在微信的平臺上有

nonce_str：隨機字串，UUID就好了，

openid：用戶標識，因為這邊是用戶已經登錄成功了，所以在session中就能拿到，

out_trade_no：商戶訂單號

spbill_create_ip：終端IP，這個可以從請求頭中拿到

total_fee：支付金額，單位是分，

trade_type：交易型別，這里我填JSAPI

notify_url：通知地址，就是用戶支付成功之后，微信訪問你的哪個介面，跟你傳遞支付成功的相關資訊，

sign：簽名，這個簽名它是由上面的10個引數計算得出的，

③原始碼
sendPay類：

import java.io.IOException;
import java.io.InputStream;
import java.math.BigDecimal;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.http.auth.AUTH;
import org.hamcrest.core.Is;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import com.jc.util.wxPay.WXPayUtil;
import com.sun.xml.internal.fastinfoset.Encoder;

import controller.AuthUtil;
import net.sf.json.JSONObject;

@Controller
@RequestMapping("/pay")
public class sendPay {
 
    /**
     * @Description 微信瀏覽器內微信支付/公眾號支付(JSAPI)
     * @param request
     * @param code
     * @return Map
     */
    @RequestMapping(value = "orders")
    public @ResponseBody Map<String, String> orders(HttpServletRequest request, HttpServletResponse response) {
        try {
             
            String openId = "用戶的openid";

            // 拼接統一下單地址引數
            Map<String, String> paraMap = new HashMap<String, String>();
            // 獲取請求ip地址
            String ip = request.getHeader("x-forwarded-for");
            if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("Proxy-Client-IP");
            }
            if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("WL-Proxy-Client-IP");
            }
            if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getRemoteAddr();
            }
            if (ip.indexOf(",") != -1) {
                String[] ips = ip.split(",");
                ip = ips[0].trim();
            }

            paraMap.put("appid", AuthUtil.APPID); // 商家平臺ID
            paraMap.put("body", "純情小店鋪-薯條"); // 商家名稱-銷售商品類目、String(128)
            paraMap.put("mch_id", AuthUtil.MCHID); // 商戶ID
            paraMap.put("nonce_str", WXPayUtil.generateNonceStr()); // UUID
            paraMap.put("openid", openId);
            paraMap.put("out_trade_no", UUID.randomUUID().toString().replaceAll("-", ""));// 訂單號,每次都不同
            paraMap.put("spbill_create_ip", ip);
            paraMap.put("total_fee", "1"); // 支付金額，單位分
            paraMap.put("trade_type", "JSAPI"); // 支付型別
            paraMap.put("notify_url", "用戶支付完成后，你想微信調你的哪個介面");// 此路徑是微信服務器呼叫支付結果通知路徑隨意寫
            String sign = WXPayUtil.generateSignature(paraMap, AuthUtil.PATERNERKEY);
            paraMap.put("sign", sign);
            String xml = WXPayUtil.mapToXml(paraMap);// 將所有引數(map)轉xml格式

            // 統一下單 https://api.mch.weixin.qq.com/pay/unifiedorder
            String unifiedorder_url = "https://api.mch.weixin.qq.com/pay/unifiedorder";

            System.out.println("xml為：" + xml);

            // String xmlStr = HttpRequest.sendPost(unifiedorder_url,
            // xml);//發送post請求"統一下單介面"回傳預支付id:prepay_id

            String xmlStr = HttpRequest.httpsRequest(unifiedorder_url, "POST", xml);

            System.out.println("xmlStr為：" + xmlStr);

            // 以下內容是回傳前端頁面的json資料
            String prepay_id = "";// 預支付id
            if (xmlStr.indexOf("SUCCESS") != -1) {
                Map<String, String> map = WXPayUtil.xmlToMap(xmlStr);
                prepay_id = (String) map.get("prepay_id");
            }

            Map<String, String> payMap = new HashMap<String, String>();
            payMap.put("appId", AuthUtil.APPID);
            payMap.put("timeStamp", WXPayUtil.getCurrentTimestamp() + "");
            payMap.put("nonceStr", WXPayUtil.generateNonceStr());
            payMap.put("signType", "MD5");
            payMap.put("package", "prepay_id=" + prepay_id);
            String paySign = WXPayUtil.generateSignature(payMap, AuthUtil.PATERNERKEY);
            payMap.put("paySign", paySign);
            //將這個6個引數傳給前端
            return payMap;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * @Title: callBack
     * @Description: 支付完成的回呼函式
     * @param:
     * @return:
     */
    @RequestMapping("/notify")
    public String callBack(HttpServletRequest request, HttpServletResponse response) {
        // System.out.println("微信支付成功,微信發送的callback資訊,請注意修改訂單資訊");
        InputStream is = null;
        try {

            is = request.getInputStream();// 獲取請求的流資訊(這里是微信發的xml格式所有只能使用流來讀)
            String xml = WXPayUtil.InputStream2String(is);
            Map<String, String> notifyMap = WXPayUtil.xmlToMap(xml);// 將微信發的xml轉map
            
            System.out.println("微信回傳給回呼函式的資訊為："+xml);
            
            if (notifyMap.get("result_code").equals("SUCCESS")) {
                String ordersSn = notifyMap.get("out_trade_no");// 商戶訂單號
                String amountpaid = notifyMap.get("total_fee");// 實際支付的訂單金額:單位 分
                BigDecimal amountPay = (new BigDecimal(amountpaid).divide(new BigDecimal("100"))).setScale(2);// 將分轉換成元-實際支付金額:元

                /*
                 * 以下是自己的業務處理------僅做參考 更新order對應欄位/已支付金額/狀態碼
                 */
                System.out.println("===notify===回呼方法已經被調！！！");
                
            }
            
            // 告訴微信服務器收到資訊了，不要在呼叫回呼action了========這里很重要回復微信服務器資訊用流發送一個xml即可
            response.getWriter().write("<xml><return_code><![CDATA[SUCCESS]]></return_code></xml>");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (is != null) {
                try {
                    is.close();
                } catch (IOException e) { 
                    e.printStackTrace();
                }
            }
        }
        
        return null;
    }

}

HttpRequest類：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

import javax.net.ssl.HttpsURLConnection;

public class HttpRequest {
    /**
     * 向指定URL發送GET方法的請求
     * 
     * @param url
     *            發送請求的URL
     * @param param
     *            請求引數,請求引數應該是 name1=value1&name2=value2 的形式，
     * @return URL 所代表遠程資源的回應結果
     */
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            System.out.println(urlNameString);
            URL realUrl = new URL(urlNameString);
            // 打開和URL之間的連接
            URLConnection connection = realUrl.openConnection();
            // 設定通用的請求屬性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立實際的連接
            connection.connect();
            // 獲取所有回應頭欄位
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍歷所有的回應頭欄位
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定義 BufferedReader輸入流來讀取URL的回應
            in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("發送GET請求出現例外！" + e);
            e.printStackTrace();
        }
        // 使用finally塊來關閉輸入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }

    /**
     * 向指定 URL 發送POST方法的請求
     * 
     * @param url
     *            發送請求的 URL
     * @param param
     *            請求引數,請求引數應該是 name1=value1&name2=value2 的形式，
     * @return 所代表遠程資源的回應結果
     */
    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打開和URL之間的連接
            URLConnection conn = realUrl.openConnection();
            // 設定通用的請求屬性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 發送POST請求必須設定如下兩行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 獲取URLConnection物件對應的輸出流
            out = new PrintWriter(conn.getOutputStream());
            // 發送請求引數
            out.print(param);
            // flush輸出流的緩沖
            out.flush();
            // 定義BufferedReader輸入流來讀取URL的回應
            in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("發送 POST 請求出現例外！" + e);
            e.printStackTrace();
        }
        // 使用finally塊來關閉輸出流、輸入流
        finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
        return result;
    }

    /**
     * post請求并得到回傳結果
     * 
     * @param requestUrl
     * @param requestMethod
     * @param output
     * @return
     */
    public static String httpsRequest(String requestUrl, String requestMethod, String output) {
        try { 
            URL url = new URL(requestUrl);
            HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setUseCaches(false);
            connection.setRequestMethod(requestMethod);
            if (null != output) {
                OutputStream outputStream = connection.getOutputStream();
                outputStream.write(output.getBytes("UTF-8"));
                outputStream.close();
            }
            // 從輸入流讀取回傳內容
            InputStream inputStream = connection.getInputStream();
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            String str = null;
            StringBuffer buffer = new StringBuffer();
            while ((str = bufferedReader.readLine()) != null) {
                buffer.append(str);
            }
            bufferedReader.close();
            inputStreamReader.close();
            inputStream.close();
            inputStream = null;
            connection.disconnect();
            return buffer.toString();
        } catch (Exception ex) {
            ex.printStackTrace();
        }

        return "";
    }
}

AuthUtil類

import java.io.IOException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

import net.sf.json.JSONObject;
public class AuthUtil {
    public static final String APPID = "平臺ID";
    public static final String APPSECRET = "平臺密鑰";
    public static final String MCHID = "商家ID";
    public static final String PATERNERKEY = "商家密鑰";
    
    
    public static JSONObject doGetJson(String url) throws ClientProtocolException, IOException {
        JSONObject jsonObject = null;
        // 首先初始化HttpClient物件
        DefaultHttpClient client = new DefaultHttpClient();
        // 通過get方式進行提交
        HttpGet httpGet = new HttpGet(url);
        // 通過HTTPclient的execute方法進行發送請求
        HttpResponse response = client.execute(httpGet);
        // 從response里面拿自己想要的結果
        HttpEntity entity = response.getEntity();
        if (entity != null) {
            String result = EntityUtils.toString(entity, "UTF-8");
            jsonObject = jsonObject.fromObject(result);
        }
        // 把鏈接釋放掉
        httpGet.releaseConnection();
        return jsonObject;
    }
}

2.3 前端的實作

這是只用一個jsp頁面來做測驗

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script type="text/javascript" src="https://www.cnblogs.com/share-record/p/js/jquery-1.11.0.min.js"></script>
<title>微信支付JSP</title>
</head>
<body> 
    <input type="button" value="https://www.cnblogs.com/share-record/p/進行微信支付" id="payId">

    <script type="text/javascript">
    
        $(function(){
            var appId,timeStamp,nonceStr,package,signType,paySign; 
            
            $("#payId").click(function(){
                pay();
            });
            
            //去后臺拿六個引數
            function pay(){   
                var url = "http://localhost:8082/WeChat/pay/orders";
                  $.get(url,function(result) {    
                          appId = result.appId;
                        timeStamp = result.timeStamp;
                        nonceStr = result.nonceStr;
                        package = result.package;
                        signType = result.signType;
                        paySign = result.paySign;
                        
                        if (typeof WeixinJSBridge == "undefined") {
                            if (document.addEventListener) {
                                document.addEventListener('WeixinJSBridgeReady',
                                        onBridgeReady, false);
                            } else if (document.attachEvent) {
                                document.attachEvent('WeixinJSBridgeReady',
                                        onBridgeReady);
                                document.attachEvent('onWeixinJSBridgeReady',
                                        onBridgeReady);
                            }
                            alert("請在微信上進行支付操作！");
                            onBridgeReady();
                        } else { 
                            onBridgeReady();
                        }
                    });
                }
            //去微信那邊發起支付請求
            function onBridgeReady(){
                
                 alert("appId:"+appId+" "+"timeStamp:"+timeStamp+" "+"nonceStr:"+nonceStr+" "+"package:"+package+" "+"signType:"+signType+" "+"paySign:"+paySign+" ");
                
                  WeixinJSBridge.invoke( 'getBrandWCPayRequest', {
                      "appId":appId,     //公眾號名稱,由商戶傳入     
                      "timeStamp":timeStamp,         //時間戳,自1970年以來的秒數     
                      "nonceStr":nonceStr, //隨機串     
                      "package":package,     
                      "signType":signType,         //微信簽名方式：     
                      "paySign":paySign //微信簽名 
                     }, 
                     function(res){      
                         if(res.err_msg == "get_brand_wcpay_request:ok" ) {
                             //alert('支付成功');
                             console.log("支付成功");
                             //支付成功后跳轉的頁面
                         }else if(res.err_msg == "get_brand_wcpay_request:cancel"){
                             alert('支付取消');
                         }else if(res.err_msg == "get_brand_wcpay_request:fail"){
                             alert('支付失敗');
                             
                             alert(JSON.stringify(res));
                             
                             WeixinJSBridge.call('closeWindow');
                         } //使用以上方式判斷前端回傳,微信團隊鄭重提示：res.err_msg將在用戶支付成功后回傳ok,但并不保證它絕對可靠，
               });    
            }
        })
</script>

</body>
</html>

三，總結

雖然第一次看官方檔案很亂，資訊量很多，但仔細總結一下，其實就下面這點流程而已，

再記錄點，以防有用：

url urlencode

public static String inputStream2String(InputStream inStream, String encoding){
        String result = null;
        ByteArrayOutputStream outStream = null;
        try {
         if(inStream != null){
          outStream = new ByteArrayOutputStream();
          byte[] tempBytes = new byte[1024];
          int count = 0;
          while((count = inStream.read(tempBytes)) != -1){
           outStream.write(tempBytes, 0, count);
          }
          tempBytes = null;
          outStream.flush();
          result = new String(outStream.toByteArray(), encoding);
          outStream.close();
         }
        } catch (Exception e) {
         result = null;
        } 
        return result;
       }

轉載：

https://blog.csdn.net/daotiao0199/article/details/85284038

https://blog.csdn.net/javaYouCome/article/details/79473743

轉載請註明出處，本文鏈接：https://www.uj5u.com/houduan/252438.html

標籤：Java

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