java如何实现APP微信支付

这篇文章主要介绍了java如何实现APP微信支付，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家一起了解一下。

1.微信配置信息 global.properties

2.方法wxpay用于生成预支付订单信息

方法notifyWeiXinPay用于微信支付成功后的回调, 注意: 在手机端使用微信支付成功后，微信服务器会根据提供的回调地址进行回调, parameterMap.put("notify_url", wxnotify); (见下面代码)

在局域网是无法进行回调的，必须将你的服务端放在公网上进行测试， 回调函数会被多次调用，如果第一次成功后，你可以将业务数据状态标志为已处理, 对于相同订单的其它回调就不需要再次处理了;

package com.main.controller; import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.UnsupportedEncodingException;import java.math.BigDecimal;import java.util.Date;import java.util.HashMap;import java.util.Map;import java.util.SortedMap;import java.util.TreeMap; import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse; import org.jdom.JDOMException;import org.springframework.http.MediaType;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.main.model.WeiXinPrePay;import com.main.util.ConfigManager;import com.main.util.DateUtil;import com.main.util.GeneralConstant;import com.main.util.PayCommonUtil;import com.main.util.Result;import com.main.util.StringUtil; @Controller@RequestMapping("/pay")public class PayController {                  String randomString = PayCommonUtil.getRandomString(32);  //支付成功后的回调函数  public static String wxnotify = "http://com.zhuohuicalss/pay/notifyWeiXinPay";                public PayController() {                System.out.println("MainController构造函数");        }                        /**   * @param totalAmount  支付金额   * @param description  描述   * @param request   * @return   */  @RequestMapping(value = "/wxpay", produces = MediaType.APPLICATION_JSON_VALUE)  @ResponseBody    public Result wxpay(HttpServletRequest request) {      Result result = new Result();    Long userId = new Long(1);//baseController.getUserId();        BigDecimal totalAmount = new BigDecimal(request.getParameter("totalPrice"));    String trade_no = "";    String description="";                try {                        trade_no = new String(request.getParameter("orderNum").getBytes("ISO-8859-1"),"UTF-8");                        description = request.getParameter("description");                } catch (UnsupportedEncodingException e) {                        // TODO Auto-generated catch block                        e.printStackTrace();                }    String openId = "";        Map map = weixinPrePay(trade_no,totalAmount,description,openId,request);     SortedMap finalpackage = new TreeMap();    //应用ID    finalpackage.put("appid", ConfigManager.getInstance().getConfigItem("WXAppID")/*PayCommonUtil.APPID*/);    //商户号    finalpackage.put("partnerid", ConfigManager.getInstance().getConfigItem("MCH_ID"));    Long time = (System.currentTimeMillis() / 1000);    //时间戳    finalpackage.put("timestamp", time.toString());    //随机字符串    finalpackage.put("noncestr", map.get("nonce_str"));    //预支付交易会话ID    finalpackage.put("prepayid", map.get("prepay_id"));    //扩展字段    finalpackage.put("package", "Sign=WXPay");        WeiXinPrePay prePay = new WeiXinPrePay();    prePay.setAppId(ConfigManager.getInstance().getConfigItem("WXAppID"));    prePay.setMchId(ConfigManager.getInstance().getConfigItem("MCH_ID"));    prePay.setTimeStamp(time.toString());    prePay.setNonceStr(map.get("nonce_str"));    prePay.setPrepayId(map.get("prepay_id"));    prePay.setSignType("MD5");    prePay.setPaySign(sign);    result.setData(prePay);    result.setStateCode(GeneralConstant.SUCCESS);    result.setDesc("微信支付加载成功");        return result;  }                  /**   * 统一下单    * 应用场景：商户系统先调用该接口在微信支付服务后台生成预支付交易单，返回正确的预支付交易回话标识后再在APP里面调起支付。   * @param trade_no   * @param totalAmount   * @param description   * @param openid   * @param sym   * @param request   * @return   */  @SuppressWarnings("unchecked")  public Map weixinPrePay(String trade_no,BigDecimal totalAmount,       String description, String openid, HttpServletRequest request) {     SortedMap parameterMap = new TreeMap();     parameterMap.put("appid", ConfigManager.getInstance().getConfigItem("WXAppID")); //应用appid     parameterMap.put("mch_id", ConfigManager.getInstance().getConfigItem("MCH_ID")/*PayCommonUtil.MCH_ID*/); //商户号    //parameterMap.put("device_info", "WEB");    parameterMap.put("nonce_str", randomString);     parameterMap.put("body", description);    parameterMap.put("out_trade_no", trade_no);    parameterMap.put("fee_type", "CNY");     System.out.println("jiner");     BigDecimal total = totalAmount.multiply(new BigDecimal(100)); //接口中参数支付金额单位为【分】，参数值不能带小数，所以乘以100    java.text.DecimalFormat df=new java.text.DecimalFormat("0");     parameterMap.put("total_fee", df.format(total));     System.out.println("jiner2");     parameterMap.put("spbill_create_ip", PayCommonUtil.getRemoteHost(request));     parameterMap.put("notify_url", wxnotify);    parameterMap.put("trade_type", "APP");//"JSAPI"    //trade_type为JSAPI是 openid为必填项    //parameterMap.put("openid", openid);    System.out.println("");     String sign = PayCommonUtil.createSign("UTF-8", parameterMap);     System.out.println("jiner2");     parameterMap.put("sign", sign);     String requestXML = PayCommonUtil.getRequestXml(parameterMap);     System.out.println(requestXML);     String result = PayCommonUtil.httpsRequest(         "https://api.mch.weixin.qq.com/pay/unifiedorder", "POST",         requestXML);     System.out.println(result);     Map map = null;     try {       map = PayCommonUtil.doXMLParse(result);     } catch (JDOMException e) {       // TODO Auto-generated catch block       e.printStackTrace();     } catch (IOException e) {       // TODO Auto-generated catch block       e.printStackTrace();     }     return map;      }       /**   * 此函数会被执行多次，如果支付状态已经修改为已支付，则下次再调的时候判断是否已经支付，如果已经支付了，则什么也执行   * @param request   * @param response   * @return   * @throws IOException   * @throws JDOMException   */  @RequestMapping(value = "notifyWeiXinPay", produces = MediaType.APPLICATION_JSON_VALUE)  // @RequestDescription("支付回调地址")  @ResponseBody  public String notifyWeiXinPay(HttpServletRequest request, HttpServletResponse response) throws IOException, JDOMException {    System.out.println("微信支付回调");    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);    }    String resultxml = new String(outSteam.toByteArray(), "utf-8");    Map params = PayCommonUtil.doXMLParse(resultxml);    outSteam.close();    inStream.close();            Map return_data = new HashMap();     if (!PayCommonUtil.isTenpaySign(params)) {      // 支付失败            return_data.put("return_code", "FAIL");       return_data.put("return_msg", "return_code不正确");            return StringUtil.GetMapToXML(return_data);    } else {      System.out.println("===============付款成功==============");      // ------------------------------      // 处理业务开始      // ------------------------------      // 此处处理订单状态，结合自己的订单数据完成订单状态的更新      // ------------------------------       String total_fee = params.get("total_fee");      double v = Double.valueOf(total_fee) / 100;      String out_trade_no = String.valueOf(Long.parseLong(params.get("out_trade_no").split("O")[0]));                        Date accountTime = DateUtil.stringtoDate(params.get("time_end"), "yyyyMMddHHmmss");                        String ordertime = DateUtil.dateToString(new Date(), "yyyy-MM-dd HH:mm:ss");                        String totalAmount = String.valueOf(v);                        String appId = params.get("appid");                        String tradeNo = params.get("transaction_id");                                        return_data.put("return_code", "SUCCESS");       return_data.put("return_msg", "OK");                         return StringUtil.GetMapToXML(return_data);    }  } }

3.用到的一些工具类

import java.io.InputStream;import java.util.*; /** * 读取配置文件的类 单例类 * @author Administrator * */public class ConfigManager {        // 属性文件命名        private Properties m_props = null;        private static Map configMap;        private static ConfigManager m_instance = null;        private static  Properties props = null;         private ConfigManager() {                m_props = new Properties();                configMap = new HashMap();                try {                        props = System.getProperties(); //获取系统属性                        m_props.load(getInputStream());                        getSysConfigMsg();                                        } catch (Exception e) {                        e.printStackTrace();                }        }        public synchronized static ConfigManager getInstance() {                if(m_instance == null){                        m_instance = new ConfigManager();                }                return m_instance;        }         public InputStream getInputStream() {                InputStream is = null;                try {                        is = getClass().getClassLoader().getResourceAsStream("global.properties");                } catch (Exception e) {                        e.printStackTrace();                }                return is;        }          public Map getSysConfigMsg(){                Set