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小編給大家分享一下Java如何實(shí)現(xiàn)微信公眾號和掃碼支付，相信大部分人都還不怎么了解，因此分享這篇文章給大家參考一下，希望大家閱讀完這篇文章后大有收獲，下面讓我們一起去了解一下吧！
一 、H5公眾號支付
要點(diǎn)：正確獲取openId以及統(tǒng)一下單接口，正確處理支付結(jié)果通知，正確配置支付授權(quán)目錄
H5的支付方式是使用較為廣泛的方式，這種支付方式主要用于微信內(nèi)自定義菜單的網(wǎng)頁，依賴手機(jī)上安裝的微信客戶端，高版本的微信才支持微信支付，下面按我的流程注意說明
1 編寫用于支付的頁面，由于是測試用就寫的簡單了點(diǎn)
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>微信支付樣例</title> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <form action="oauthServlet" method="POST"> 訂單號：<input type="text" name="orderNo" /> <input type="submit" value="H5支付"/> </form> </br></br> <form action="scanCodePayServlet?flag=createCode" method="POST"> 訂單號：<input type="text" name="orderNo" /> <input type="submit" value="掃碼支付"/> </form> </body> </html>
2 編寫一個(gè)servlet用于通過Oauth獲取code
package com.debug.weixin.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.debug.weixin.util.CommonUtil;
import com.debug.weixin.util.ServerConfig;
public class OauthServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String orderNo=request.getParameter("orderNo");
//調(diào)用微信Oauth3.0獲取openid
String redirectURL=ServerConfig.SERVERDOMAIN+"/BasicWeixin/payServletForH5?orderNo="+orderNo;
String redirectURI="";
try {
redirectURI=CommonUtil.initOpenId(redirectURL);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//System.out.println(redirectURI);
//RequestDispatcher dis= request.getRequestDispatcher(redirectURI);
//dis.forward(request, response);
response.sendRedirect(redirectURI);
}
}3 獲取到code后，通過REDIRECTURI獲取openId,調(diào)用統(tǒng)一下單接口
package com.debug.weixin.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.SortedMap;
import java.util.TreeMap;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.debug.weixin.pojo.WeixinOauth3Token;
import com.debug.weixin.pojo.WeixinQRCode;
import com.debug.weixin.util.AdvancedUtil;
import com.debug.weixin.util.CommonUtil;
import com.debug.weixin.util.ConfigUtil;
import com.debug.weixin.util.PayCommonUtil;
public class PayServletForH5 extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String orderNo=request.getParameter("orderNo");
String code=request.getParameter("code");
//獲取AccessToken
WeixinOauth3Token token=AdvancedUtil.getOauth3AccessToken(ConfigUtil.APPID, ConfigUtil.APP_SECRECT, code);
String openId=token.getOpenId();
//調(diào)用微信統(tǒng)一支付接口
SortedMap<Object, Object> parameters = new TreeMap<Object, Object>();
parameters.put("appid", ConfigUtil.APPID);
parameters.put("mch_id", ConfigUtil.MCH_ID);
parameters.put("device_info", "1000");
parameters.put("body", "我的測試訂單");
parameters.put("nonce_str", PayCommonUtil.CreateNoncestr());
parameters.put("out_trade_no", orderNo);
//parameters.put("total_fee", String.valueOf(total));
parameters.put("total_fee", "1");
parameters.put("spbill_create_ip", request.getRemoteAddr());
parameters.put("notify_url", ConfigUtil.NOTIFY_URL);
parameters.put("trade_type", "JSAPI");
parameters.put("openid", openId);
String sign = PayCommonUtil.createSign("UTF-8", parameters);
parameters.put("sign", sign);
String requestXML = PayCommonUtil.getRequestXml(parameters);
String result = CommonUtil.httpsRequestForStr(ConfigUtil.UNIFIED_ORDER_URL,"POST", requestXML);
System.out.println("----------------------------------");
System.out.println(result);
System.out.println("----------------------------------");
request.setAttribute("orderNo", orderNo);
request.setAttribute("totalPrice", "0.01");
String payJSON="";
try {
payJSON=CommonUtil.getH5PayStr(result,request);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//System.out.println(payJSON);
request.setAttribute("unifiedOrder",payJSON);
RequestDispatcher dis= request.getRequestDispatcher("h6Pay.jsp");
dis.forward(request, response);
}
}調(diào)用微信統(tǒng)一下單接口，需要注意簽名算法，只有簽名計(jì)算正確才能順利支付
public static String getH5PayStr(String result,HttpServletRequest request) throws Exception{
Map<String, String> map = XMLUtil.doXMLParse(result);
SortedMap<Object,Object> params = new TreeMap<Object,Object>();
params.put("appId", ConfigUtil.APPID);
params.put("timeStamp", Long.toString(new Date().getTime()));
params.put("nonceStr", PayCommonUtil.CreateNoncestr());
params.put("package", "prepay_id="+map.get("prepay_id"));
params.put("signType", ConfigUtil.SIGN_TYPE);
String paySign = PayCommonUtil.createSign("UTF-8", params);
params.put("paySign", paySign); //paySign的生成規(guī)則和Sign的生成規(guī)則一致
String json = JSONObject.fromObject(params).toString();
return json;
}4 編寫最終的支付界面調(diào)起微信H5支付
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>微信H5支付</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">
<script type="text/javascript">
function jsApiCall(){
WeixinJSBridge.invoke(
'getBrandWCPayRequest',<%=(String)request.getAttribute("unifiedOrder")%>, function(res){
WeixinJSBridge.log(res.err_msg);
//alert(res.err_code+res.err_desc+res.err_msg);
if(res.err_msg == "get_brand_wcpay_request:ok" ) {
alert("恭喜你,支付成功!");
}else{
alert(res.err_code+res.err_desc+res.err_msg);
}
}
);
}
function callpay(){
if (typeof WeixinJSBridge == "undefined"){
if( document.addEventListener ){
document.addEventListener('WeixinJSBridgeReady', jsApiCall, false);
}else if (document.attachEvent){
document.attachEvent('WeixinJSBridgeReady', jsApiCall);
document.attachEvent('onWeixinJSBridgeReady', jsApiCall);
}
}else{
jsApiCall();
}
}
</script>
</head>
<body>
<input type="button" value="支付" onclick="callpay()"/>
</body>
</html>5 處理微信支付結(jié)果通知
package com.debug.weixin.servlet;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.jdom.JDOMException;
import com.debug.weixin.util.PayCommonUtil;
import com.debug.weixin.util.XMLUtil;
public class PayHandlerServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
InputStream inStream = request.getInputStream();
ByteArrayOutputStream outSteam = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
while ((len = inStream.read(buffer)) != -1) {
outSteam.write(buffer, 0, len);
}
outSteam.close();
inStream.close();
String result = new String(outSteam.toByteArray(),"utf-8");//獲取微信調(diào)用我們notify_url的返回信息
Map<Object, Object> map=null;
try {
map = XMLUtil.doXMLParse(result);
} catch (JDOMException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
for(Object keyValue : map.keySet()){
System.out.println(keyValue+"="+map.get(keyValue));
}
if (map.get("result_code").toString().equalsIgnoreCase("SUCCESS")) {
//對訂單進(jìn)行業(yè)務(wù)操作
System.out.println("-------------OK");
response.getWriter().write(PayCommonUtil.setXML("SUCCESS", "")); //告訴微信服務(wù)器，我收到信息了，不要在調(diào)用回調(diào)action了
}
}
}對于上面的代碼，有很多都是參考blog.csdn.net/u011160656/article/details/41759195，因此這部分的代碼就不貼出來了，需要的話看這個(gè)博客就知道了。
二 微信掃碼支付（模式一）
要點(diǎn)：必須調(diào)用長鏈接轉(zhuǎn)短鏈接接口、正確配置掃碼支付回調(diào)URL
1 根據(jù)訂單號生成微信支付二維碼
下面是幾個(gè)生成二維碼的方法：
package com.debug.weixin.util;
import com.google.zxing.common.BitMatrix;
import javax.imageio.ImageIO;
import java.io.File;
import java.io.OutputStream;
import java.io.IOException;
import java.awt.image.BufferedImage;
public final class MatrixToImageWriter {
private static final int BLACK = 0xFF000000;
private static final int WHITE = 0xFFFFFFFF;
private MatrixToImageWriter() {}
public static BufferedImage toBufferedImage(BitMatrix matrix) {
int width = matrix.getWidth();
int height = matrix.getHeight();
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
}
}
return image;
}
public static void writeToFile(BitMatrix matrix, String format, File file)
throws IOException {
BufferedImage image = toBufferedImage(matrix);
if (!ImageIO.write(image, format, file)) {
throw new IOException("Could not write an image of format " + format + " to " + file);
}
}
public static void writeToStream(BitMatrix matrix, String format, OutputStream stream)
throws IOException {
BufferedImage image = toBufferedImage(matrix);
if (!ImageIO.write(image, format, stream)) {
throw new IOException("Could not write an image of format " + format);
}
}
}這個(gè)算是工具類，還有一個(gè)就是把二維碼顯示在界面上的方法，CreateQRCode主要用到代碼塊：
public static void createCodeStream(String text,HttpServletResponse response) throws Exception{
// response.setContentType("image/jpeg");
ServletOutputStream sos = response.getOutputStream();
int width = 500;
int height = 500;
//二維碼的圖片格式
String format = "jpg";
MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
Map hints = new HashMap();
//內(nèi)容所使用編碼
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
BitMatrix bitMatrix = multiFormatWriter.encode(text, BarcodeFormat.QR_CODE, width, height, hints);
//生成二維碼
MatrixToImageWriter.writeToStream(bitMatrix, format,sos);
sos.close();
}2 長鏈接轉(zhuǎn)短鏈接生成二維碼，編寫掃碼支付回調(diào)方法并調(diào)用統(tǒng)一下單接口
package com.debug.weixin.servlet; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.PrintWriter; import java.util.Date; import java.util.Map; import java.util.SortedMap; import java.util.TreeMap; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.jdom.JDOMException; import com.debug.weixin.util.CommonUtil; import com.debug.weixin.util.ConfigUtil; import com.debug.weixin.util.CreateQRCode; import com.debug.weixin.util.PayCommonUtil; import com.debug.weixin.util.XMLUtil; import com.mongodb.DBObject; public class ScanCodePayServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String flag=request.getParameter("flag"); if("createCode".equals(flag)){ createPayCode(request,response); }else{ try { wxScanCodeHandler(request,response); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } } public void createPayCode(HttpServletRequest request,HttpServletResponse response){ String orderNo=request.getParameter("orderNo"); SortedMap<Object,Object> paras = new TreeMap<Object,Object>(); paras.put("appid", ConfigUtil.APPID); paras.put("mch_id", ConfigUtil.MCH_ID); paras.put("time_stamp", Long.toString(new Date().getTime())); paras.put("nonce_str", PayCommonUtil.CreateNoncestr()); paras.put("product_id", orderNo);//商品號要唯一 String sign = PayCommonUtil.createSign("UTF-8", paras); paras.put("sign", sign); String url = "weixin://wxpay/bizpayurl?sign=SIGN&appid=APPID&mch_id=MCHID&product_id=PRODUCTID&time_stamp=TIMESTAMP&nonce_str=NOCESTR"; String nativeUrl = url.replace("SIGN", sign).replace("APPID", ConfigUtil.APPID).replace("MCHID", ConfigUtil.MCH_ID).replace("PRODUCTID", (String)paras.get("product_id")).replace("TIMESTAMP", (String)paras.get("time_stamp")).replace("NOCESTR", (String)paras.get("nonce_str")); SortedMap<Object,Object> parameters = new TreeMap<Object,Object>(); parameters.put("appid", ConfigUtil.APPID); parameters.put("mch_id", ConfigUtil.MCH_ID); parameters.put("nonce_str", PayCommonUtil.CreateNoncestr()); parameters.put("long_url", CommonUtil.urlEncodeUTF8(nativeUrl)); String sign2 = PayCommonUtil.createSign("UTF-8", parameters); parameters.put("sign", sign2); String requestXML = PayCommonUtil.getRequestXml(parameters); String result =CommonUtil.httpsRequestForStr(ConfigUtil.SHORT_URL, "POST", requestXML); Map<String, String> map=null; try { map = XMLUtil.doXMLParse(result); } catch (JDOMException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } String returnCode = map.get("return_code"); String resultCode = map.get("result_code"); if(returnCode.equalsIgnoreCase("SUCCESS")&&resultCode.equalsIgnoreCase("SUCCESS")){ String shortUrl = map.get("short_url"); //TODO 拿到shortUrl，寫代碼生成二維碼 System.out.println("shortUrl="+shortUrl); try { CreateQRCode.createCodeStream(shortUrl,response); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } } public void wxScanCodeHandler(HttpServletRequest request,HttpServletResponse response) throws Exception { InputStream inStream = request.getInputStream(); ByteArrayOutputStream outSteam = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int len = 0; while ((len = inStream.read(buffer)) != -1) { outSteam.write(buffer, 0, len); } outSteam.close(); inStream.close(); String result = new String(outSteam.toByteArray(),"utf-8");//獲取微信調(diào)用我們notify_url的返回信息 Map<Object, Object> map=null; try { map = XMLUtil.doXMLParse(result); } catch (JDOMException e) { // TODO Auto-generated catch block e.printStackTrace(); } for(Object keyValue : map.keySet()){ System.out.println(keyValue+"="+map.get(keyValue)); } String orderNo=map.get("product_id").toString(); //接收到請求參數(shù)后調(diào)用統(tǒng)一下單接口 SortedMap<Object, Object> parameters = new TreeMap<Object, Object>(); parameters.put("appid", ConfigUtil.APPID); parameters.put("mch_id", ConfigUtil.MCH_ID); parameters.put("device_info", "1000"); parameters.put("body", "測試掃碼支付訂單"); parameters.put("nonce_str", PayCommonUtil.CreateNoncestr()); parameters.put("out_trade_no", map.get("product_id")); //parameters.put("total_fee", String.valueOf(totalPrice)); parameters.put("total_fee", "1"); parameters.put("spbill_create_ip", request.getRemoteAddr()); parameters.put("notify_url", ConfigUtil.NOTIFY_URL); parameters.put("trade_type", "NATIVE"); parameters.put("openid", map.get("openid")); String sign = PayCommonUtil.createSign("UTF-8", parameters); parameters.put("sign", sign); String requestXML = PayCommonUtil.getRequestXml(parameters); String result2 = CommonUtil.httpsRequestForStr(ConfigUtil.UNIFIED_ORDER_URL,"POST", requestXML); System.out.println("-----------------------------統(tǒng)一下單結(jié)果---------------------------"); System.out.println(result2); Map<String, String> mm=null; try { mm=getH5PayMap(result2,request); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } //String prepayId=getPrepayId(result2,request); //String returnNoneStr=getReturnNoneStr(result2,request); String prepayId=mm.get("prepay_id"); String returnNoneStr=mm.get("nonce_str");; SortedMap<Object, Object> lastSign = new TreeMap<Object, Object>(); lastSign.put("return_code", "SUCCESS"); lastSign.put("appid", ConfigUtil.APPID); lastSign.put("mch_id", ConfigUtil.MCH_ID); lastSign.put("nonce_str", returnNoneStr); lastSign.put("prepay_id", prepayId); lastSign.put("result_code", "SUCCESS"); lastSign.put("key", ConfigUtil.API_KEY); String lastSignpara = PayCommonUtil.createSign("UTF-8", lastSign); StringBuffer buf=new StringBuffer(); buf.append("<xml>"); buf.append("<return_code>SUCCESS</return_code>"); buf.append("<appid>"+ConfigUtil.APPID+"</appid>"); buf.append("<mch_id>"+ConfigUtil.MCH_ID+"</mch_id>"); buf.append("<nonce_str>"+returnNoneStr+"</nonce_str>"); buf.append("<prepay_id>"+prepayId+"</prepay_id>"); buf.append("<result_code>SUCCESS</result_code>"); buf.append("<sign>"+lastSignpara+"</sign>"); buf.append("</xml>"); response.getWriter().print(buf.toString()); } public Map<String, String> getH5PayMap(String result,HttpServletRequest request) throws Exception{ Map<String, String> map = XMLUtil.doXMLParse(result); return map; } }
最終看下公眾號支付和掃碼支付的微信配置：
以上是“Java如何實(shí)現(xiàn)微信公眾號和掃碼支付”這篇文章的所有內(nèi)容，感謝各位的閱讀！相信大家都有了一定的了解，希望分享的內(nèi)容對大家有所幫助，如果還想學(xué)習(xí)更多知識，歡迎關(guān)注億速云行業(yè)資訊頻道！
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