1.微信支付官方文件微信官網連結
2.可以看到這些支付方式。

3.在此介紹公眾號支付和app支付。後面的開發基本看下文件就沒什麼問題了。
4.開發之前需要準備前期公眾。
5.首先需要申請公眾號並且開通支付等設定一些配置東西，這裡就不廢話了。
6.程式碼如下：
一、公眾號網頁支付（H5調起支付）

package com.common.action;
import java.io.BufferedOutputStream;
import java.math.BigDecimal;
import java.util.HashMap;
import java.util.List;
 

import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts2.ServletActionContext
 
;
import org.apache.struts2.convention.annotation.Namespace;
import org.apache.struts2.convention.annotation.ParentPackage;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import com.common.util.PoUtil;
import com.common.util
 
.RequestUtil;
import com.common.util.ResponseResultUtil;
import com.common.util.ResultBeanUtil;
import com.common.util.TokenUtil;
import com.common.util.wx.WeixinPayUtil;
import com.common.util.wx.XMLUtil;
import com.frame.base.dto.Query;
import com.frame.enums.DeletedStatus;
import com.frame.enums.PlatformType;
import com.opensymphony.xwork2.ActionSupport;
import com.sfc.service.interfaces.ISfcFormOrderServiceCustom;

@ParentPackage("struts-framework")
@Namespace("/wxPayTools")
@SuppressWarnings("all")
public class WxPayToolsAction extends ActionSupport{
    private static final long serialVersionUID = 4809391090975348475L;
    private static final Log logger = LogFactory.getLog(WxPayToolsAction.class);
    protected HttpServletRequest request = ServletActionContext.getRequest();
    protected HttpServletResponse response = ServletActionContext.getResponse();
    @Autowired
    @Qualifier("tSysWxPayConfigCustomService")
    private ITSysWxPayConfigServiceCustom tSysWxPayConfigCustomService;
    @Autowired
    @Qualifier("terminalUserService")
    private ITerminalUserService terminalUserService;

    /**
     * 獲取action類名
     * @return
     */
    private String getActionName(){
        return this.getClass().getSimpleName();
    }
    /**
     * 微信公眾號支付
     */
    public void wxPay(){
        String methodName = "wxPay";
        String message = "";
        try{    
        String ecid = RequestUtil.getParameter(request, "ecid");
        String orderNum = RequestUtil.getParameter(request, "orderNum");
        String orderMoney = RequestUtil.getParameter(request, "orderMoney");
        String userId = RequestUtil.getParameter(request, "userId");
        String notifyUrl = RequestUtil.getParameter(request, "notifyUrl");
        String body = RequestUtil.getParameter(request, "body");
        String detail = RequestUtil.getParameter(request, "detail");

        TSysWxPayConfigCustom wxPayConfigCustom =    tSysWxPayConfigCustomService.getTSysWxPayConfigCustom(ecid);
        if(wxPayConfigCustom == null){
            ResponseUtils.renderJsonObject(response, ResponseResultUtil.returnFailResult(ResultBeanUtil.MSG_FAIL, "查詢配置資訊為空");
                return;
        }
        // 獲取 prepayId
        String prepayId= "";
        Map<String, Object> mrsInfo = new HashMap<String, Object>();
        SortedMap<String, String> wxInfo = new TreeMap<>();
        wxInfo.put("orderNum",orderNum);
        wxInfo.put("orderMoney",orderMoney);
        wxInfo.put("body",body);
        wxInfo.put("detail",detail);
        Map<String, String> data = new HashMap<String,String>();
        //微信公眾號手機網頁支付
        TerminalUser terminalUser = terminalUserService.findObjById(userId);
        if(terminalUser == null){
            message =  "查詢資料為空terminalUser="+terminalUser ;
                ResponseUtils.renderJsonObject(response, ResponseResultUtil.returnFailResult(ResultBeanUtil.MSG_FAIL, message));
                return;
            }
            String openId = terminalUser.getOpenId();
            if(StringUtil.isEmptyOrNullStr(openId)){
                ResponseUtils.renderJsonObject(response, ResponseResultUtil.returnFailResult(ResultBeanUtil.MSG_FAIL, "使用者openid為空openId="+openId));
                return;
            }
            wxInfo.put("openId", openId);
            // 根據prepayId簽名
             prepayId = WeixinPayUtil.getWxJsPrepayId(request, response, wxInfo, wxPayConfigCustom,notifyUrl);
             data = weixiPayUtil.createWxJsSignByPrepayId(request, response, prepayId, wxPayConfigCustom);
             if (StringUtil.isEmptyOrNullStr(prepayId) || "-1".equals(prepayId)) {
                message = methodName + " 方法 微信支付 ,微信公眾號手機網頁支付獲取預支付 prepayId " + prepayId + " 有誤！";
                logger.error(message);
                ResponseUtils.renderJsonObject(response,ResponseResultUtil.returnExceptionResult(ResultBeanUtil.MSG_EXCEPTION, message));
                return;
            }
             mrsInfo.put("wxJsApi", data);
             ResponseUtils.renderJsonObject(response, ResponseResultUtil.returnSuccResult(mrsInfo));
        }catch(Exception e){
            logger.error(getActionName() + "類的" + methodName + " 方法異常了exception=" + e.getMessage(), e);
            e.printStackTrace();
            ResponseUtils.renderJsonObject(response, ResponseResultUtil.returnExceptionResult(
                    ResultBeanUtil.MSG_EXCEPTION, getActionName() + "類的" + methodName + " 方法異常了!"));
        }
    }   
}






package com.common.util.wx;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts2.ServletActionContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.xcx.util.Sign;

/**
 * 微信支付工具類
 * @ClassName: WeixiPayUtil 
 * @Description: 微信支付工具
 * @author Administrator
 * @date 2017年4月28日 下午12:02:12 
 *
 */
public class WeixinPayUtil {
    private static Logger logger = LoggerFactory.getLogger(WeixinPayUtil.class);
    public static final String RETURN_CODE_SUCC = "SUCCESS";
    public static final String RETURN_CODE_FAIL = "FAIL";
    public static final String JSAPI_PREPAY_ID = "jsapi_prepayId_";
    public static final String APP_PREPAY_ID = "app_prepayId_";
    protected static HttpServletRequest request = ServletActionContext.getRequest();
    protected static HttpServletResponse response = ServletActionContext.getResponse();

    public static SortedMap<String,String> getOrderInfoMap(Map<String, Object> mrsInfo,  List<Map<String, Object>> productList){

        SortedMap<String,String> orderInfo = new TreeMap<String, String>();

        orderInfo.put("userId", mrsInfo.get("userId").toString());
        orderInfo.put("orderNum", mrsInfo.get("orderNum").toString());
        orderInfo.put("orderMoney", mrsInfo.get("allMoney").toString());

        String subject = "",body="";
        int bookCount = 0;
        if(productList!=null && productList.size()>0){
            for (Map<String, Object> shopOrderDetail : productList) {
                subject = subject + shopOrderDetail.get("productName") + " , ";
                bookCount = bookCount + StrUtil.getIntValue(shopOrderDetail.get("productCount").toString());
            }
        }

        if(subject.contains(",")){
            if(subject.length()>25){
                subject = subject.substring(0,25)+"......";
            } 
            subject = subject.substring(0,subject.length()-3);// 去掉最後一個,號或者最後一個.號
        }

        body = "訂單："+mrsInfo.get("orderNum")+" 共包含"+bookCount+"件商品。";

        orderInfo.put("body", body);
        orderInfo.put("detail", subject);

        return orderInfo;
    }

    /**
     * 獲取JSAPI預支付ID
     * @param request
     * @param response
     * @param orderInfo 包括欄位orderNum，orderMoney(單位:分)，myNotifyUrl(自定義回撥地址時,可空)，openId，detail(可空)，body
     * @param wxPayConfigCustom
     * @param selfNotifyUrl 自定義通知連結
     * @return
     */
    public static String getWxJsPrepayId(HttpServletRequest request, HttpServletResponse response, Map<String,String> orderInfo, TSysWxPayConfigCustom wxPayConfigCustom, String selfNotifyUrl){
        String methodName = "getWxJsPrepayId";

        // 微信配置資訊
        String wxappId = wxPayConfigCustom.getPublicAppId();            // 公眾號的唯一標識
        String wxappSecret = wxPayConfigCustom.getPublicSecret();       // 微信公眾平臺應用APPSECRET

        // 訂單資訊
        String out_trade_no = orderInfo.get("orderNum");//訂單號
        logger.info("out_trade_no="+out_trade_no);
        String prepayId = getJsapiPrepayIdRedis(out_trade_no);
        if(!StringUtil.isEmpty(prepayId)){
            return prepayId;
        }

        String orderMoney = orderInfo.get("orderMoney");
        logger.info("orderMoney="+orderMoney);
        // 呼叫公共支付介面傳的自定義業務回撥通知地址
        String myNotifyUrl = orderInfo.get("myNotifyUrl");  

        // 金額轉化為分為單位
        float sessionmoney = Float.parseFloat(orderMoney);
        String finalmoney = String.format("%.2f", sessionmoney);
        String total_fee = Integer.parseInt(finalmoney.replace(".", "")) + "";
        String detail = orderInfo.get("detail");
        String openId = orderInfo.get("openId");
        logger.info("openId="+openId);
        // 商品描述
        String body = orderInfo.get("body");
        logger.info("body="+body);
        if(StringUtil.isEmptyAnyOf(out_trade_no, orderMoney, body, openId)){
            logger.info(getClassName()+"類 "+ methodName +"方法，orderNum,orderMoney,body,openId引數必須都不為空！");
            return "-1";
        }

        // 商戶相關資料 
        String wxpartner = wxPayConfigCustom.getPublicMchId();
        String wxpartnerkey = wxPayConfigCustom.getPublicKey();

        // 商戶號
        String mch_id = wxpartner;

        // 隨機數 
        String nonce_str = Sha1Util.getNonceStr();
        //附加資料
        String attach = getAttachKey(out_trade_no, myNotifyUrl);
        // 訂單生成的機器 IP
        String spbill_create_ip = request.getRemoteAddr();

        // 這裡notify_url是 支付完成後微信發給該連結資訊，可以判斷會員是否支付成功，改變訂單狀態等。
        String url = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + request.getContextPath();
        String notify_url = url;
        if (StringUtil.isEmpty(selfNotifyUrl)) {
            notify_url += WeixinConfig.notify_url;//支付調起的連結/weiXinPay/wei_xin_pay!payNotify.action
        } else {
            notify_url += selfNotifyUrl;
        } 

        String trade_type = WeixinConfig.trade_type_jsapi;//填寫JSAPI

        SortedMap<String, String> packageParams = new TreeMap<String, String>();
        packageParams.put("appid", wxappId);
        packageParams.put("mch_id", mch_id);  
        packageParams.put("nonce_str", nonce_str);  
        packageParams.put("body", body);  
        if (StringUtil.isNotEmpty(detail)) {
            packageParams.put("detail", detail);
        }
        packageParams.put("attach", attach);  
        packageParams.put("out_trade_no", out_trade_no);  
        packageParams.put("total_fee", total_fee);  
        packageParams.put("spbill_create_ip", spbill_create_ip);  
        packageParams.put("notify_url", notify_url);  
        packageParams.put("trade_type", trade_type);  
        packageParams.put("openid", openId);  

        RequestHandler reqHandler = new RequestHandler(request, response);
        reqHandler.init(wxappId, wxappSecret, wxpartnerkey);

        String sign = reqHandler.createSign(packageParams);
        String xml="<xml>"+
                "<appid>"+wxappId+"</appid>"+
                "<mch_id>"+mch_id+"</mch_id>"+
                "<nonce_str>"+nonce_str+"</nonce_str>"+
                "<sign>"+sign+"</sign>"+
                "<body><![CDATA["+body+"]]></body>";
        if(StringUtil.isNotEmpty(detail)){
            xml += "<detail><![CDATA["+detail+"]]></detail>";
        }
        xml += "<attach>"+attach+"</attach>"+
            "<out_trade_no>"+out_trade_no+"</out_trade_no>"+
            "<total_fee>"+total_fee+"</total_fee>"+
            "<spbill_create_ip>"+spbill_create_ip+"</spbill_create_ip>"+
            "<notify_url>"+notify_url+"</notify_url>"+
            "<trade_type>"+trade_type+"</trade_type>"+
            "<openid>"+openId+"</openid>"+
            "</xml>";

        logger.info(getClassName()+"類 "+ methodName +"方法，xml="+ xml);

        String createOrderURL = WeixinConfig.prepay_url;
        try {
            prepayId = GetWxOrderno.getPayNo(createOrderURL, xml);
            setJsapiPrepayIdRedis(out_trade_no, prepayId);

            logger.info(getClassName()+"類 "+ methodName +"方法，生成 prepayId="+prepayId+"||orderNum="+out_trade_no);
        } catch (Exception e) {
            logger.error(getClassName()+"類 "+ methodName +"方法，生成 prepayId 出錯了", e);
            e.printStackTrace();
        }

        return prepayId;
    }






package com.shopn.util;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
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.params.HttpProtocolParams;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.common.model.TSysWxPayConfigCustom;
import net.sf.json.JSONObject;
public class weixiPayUtil {
    private static Logger logger = LoggerFactory.getLogger(weixiPayUtil.class);

//封裝H5請求的引數
public static Map<String,String> createWxJsSignByPrepayId(HttpServletRequest request, HttpServletResponse response, String prepayId,TSysWxPayConfigCustom wxPayConfigCustom){

        String wxappid = WeixinpayConfig.wxappid;
        String wxappsecret = WeixinpayConfig.wxappsecret;
        String partnerkey = WeixinpayConfig.wxpartnerkey;
        if(wxPayConfigCustom!=null){
            if(!StringUtil.isEmptyOrNullStr(wxPayConfigCustom.getPublicAppId())){
                wxappid = wxPayConfigCustom.getPublicAppId();
                wxappsecret = wxPayConfigCustom.getPublicSecret();
                partnerkey = wxPayConfigCustom.getPublicKey();
            }
        }
        String noncestr = Sha1Util.getNonceStr();
        String timeStamp = Sha1Util.getTimeStamp();
        String signType = WeixinpayConfig.sign_type_md5;
        String packageStr = "prepay_id="+prepayId;

        SortedMap<String,String> params = new TreeMap<String,String>();
        params.put("appId", wxappid);
        params.put("timeStamp",timeStamp);
        params.put("nonceStr", noncestr);
        params.put("package", packageStr);
        params.put("signType", signType);

        //生成支付簽名,這個簽名 給 微信支付的呼叫使用
        RequestHandler reqHandler = new RequestHandler(request, response);
        reqHandler.init(wxappid, wxappsecret, partnerkey);
        String paySign = reqHandler.createSign(params); 

        Map<String,String> map = new HashMap<String, String>();
        map.put("appId", wxappid);
        map.put("nonceStr", noncestr);
        map.put("timeStamp", timeStamp);
        map.put("signType", signType);
        map.put("packageStr", packageStr);
        map.put("paySign", paySign);

        logger.info("createWxJsSignByPrepayId方法中生成 finalSign "+paySign);
        return map;
    }
}
}

生成微信公眾號H5發起的支付引數，然後通前端H5調起支付就可以了。H5發起支付微信公眾號連結