Java调用微信支付代码

核心需求&＃xff1a;用户点击按钮&＃xff0c;生成一个二维码&＃xff0c;微信扫码之后支付成功。要调用微信的接口&＃xff0c;首先你需要引入微信支付的jar包&＃xff0c;如下&＃xff1a;

1. 引入微信支付的jar包

            com.github.wxpay

            wxpay-sdk

            0.0.3

2.开发工具类&＃xff1a;

package com.example.ffmpeg;import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap;import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import com.github.wxpay.sdk.WXPay;public class WXService {private static Logger logger &＃61; LoggerFactory.getLogger(WXService.class);private WXPay wxpay;private WXPayConfigImpl config;private static WXService INSTANCE; private WXService() throws Exception {config &＃61; WXPayConfigImpl.getInstance();wxpay &＃61; new WXPay(config);}public static WXService getInstance() throws Exception {if (INSTANCE &＃61;&＃61; null) {synchronized (WXPayConfigImpl.class) {if (INSTANCE &＃61;&＃61; null) {INSTANCE &＃61; new WXService();}}}return INSTANCE;}
3.下单接口&＃xff1a;/*** * * &＃64;param out_trade_no* &＃64;param body* &＃64;param money* &＃64;param applyNo* &＃64;return*/public String doUnifiedOrder(String out_trade_no, String body, Double money, String applyNo) {String amt &＃61; String.valueOf(money * 100);HashMap data &＃61; new HashMap();data.put("body", body);data.put("out_trade_no", out_trade_no);data.put("device_info", "web");data.put("fee_type", "CNY");data.put("total_fee", amt.substring(0, amt.lastIndexOf(".")));data.put("spbill_create_ip", config.getSpbillCreateIp());data.put("notify_url", config.getNotifUrl());data.put("trade_type", config.getTradeType());data.put("product_id", applyNo);System.out.println(String.valueOf(money * 100));// data.put("time_expire", "20170112104120");try {Map r &＃61; wxpay.unifiedOrder(data);logger.info("返回的参数是" &＃43; r);return r.get("code_url");} catch (Exception e) {e.printStackTrace();logger.info(e.getMessage());return null;}}
4. 退款接口&＃xff1a;public void doRefund(String out_trade_no, String total_fee) {logger.info("退款时的订单号为&＃xff1a;" &＃43; out_trade_no &＃43; "退款时的金额为:" &＃43; total_fee);String amt &＃61; String.valueOf(Double.parseDouble(total_fee) * 100);logger.info("修正后的金额为&＃xff1a;" &＃43; amt);logger.info("最终的金额为&＃xff1a;" &＃43; amt.substring(0, amt.lastIndexOf(".")));HashMap data &＃61; new HashMap();data.put("out_trade_no", out_trade_no);data.put("out_refund_no", out_trade_no);data.put("total_fee", amt.substring(0, amt.lastIndexOf(".")));data.put("refund_fee", amt.substring(0, amt.lastIndexOf(".")));data.put("refund_fee_type", "CNY");data.put("op_user_id", config.getMchID());try {Map r &＃61; wxpay.refund(data);logger.info("退款操作返回的参数为" &＃43; r);} catch (Exception e) {e.printStackTrace();}}
4. 验证接口&＃xff1a;/*** * &＃64;param out_trade_no* &＃64;param body* &＃64;param money* &＃64;param applyNo* &＃64;return* &＃64;throws DocumentException */public boolean checkSign(String strXML) throws DocumentException {SortedMap smap &＃61; new TreeMap();Document doc &＃61; DocumentHelper.parseText(strXML);Element root &＃61; doc.getRootElement();for (Iterator iterator &＃61; root.elementIterator(); iterator.hasNext();) {Element e &＃61; (Element) iterator.next();smap.put(e.getName(), e.getText());}return isWechatSign(smap,config.getKey());}private boolean isWechatSign(SortedMap smap,String apiKey) {StringBuffer sb &＃61; new StringBuffer();Set> es &＃61; smap.entrySet();Iterator> it &＃61; es.iterator();while (it.hasNext()) {Entry entry &＃61; it.next();String k &＃61; (String) entry.getKey();String v &＃61; (String) entry.getValue();if (!"sign".equals(k) && null !&＃61; v && !"".equals(v) && !"key".equals(k)) {sb.append(k &＃43; "&＃61;" &＃43; v &＃43; "&");}}sb.append("key&＃61;" &＃43; apiKey);/** 验证的签名 */String sign &＃61; MD5Util.MD5Encode(sb.toString(), "utf-8").toUpperCase();/** 微信端返回的合法签名 */String validSign &＃61; ((String) smap.get("sign")).toUpperCase();return validSign.equals(sign);}
}
4. 配置类&＃xff1a;package com.example.ffmpeg;import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;import com.github.wxpay.sdk.WXPayConfig;public class WXPayConfigImpl implements WXPayConfig{private byte[] certData;private static WXPayConfigImpl INSTANCE;private WXPayConfigImpl() throws Exception{String certPath &＃61; "F:\\weixin\\apiclient_cert.p12";File file &＃61; new File(certPath);InputStream certStream &＃61; new FileInputStream(file);this.certData &＃61; new byte[(int) file.length()];certStream.read(this.certData);certStream.close();}public static WXPayConfigImpl getInstance() throws Exception{if (INSTANCE &＃61;&＃61; null) {synchronized (WXPayConfigImpl.class) {if (INSTANCE &＃61;&＃61; null) {INSTANCE &＃61; new WXPayConfigImpl();}}}return INSTANCE;}public String getAppID() {return "你的appid";}public String getMchID() {return "你的商户id";}public String getKey() {return "你设置的key值";}public String getNotifUrl() {return "微信通知回调的url接口";}public String getTradeType() {return "NATIVE";}public InputStream getCertStream() {ByteArrayInputStream certBis;certBis &＃61; new ByteArrayInputStream(this.certData);return certBis;}public int getHttpConnectTimeoutMs() {return 2000;}public int getHttpReadTimeoutMs() {return 10000;}// IWXPayDomain getWXPayDomain() {
// return WXPayDomainSimpleImpl.instance();
// }public String getPrimaryDomain() {return "api.mch.weixin.qq.com";}public String getAlternateDomain() {return "api2.mch.weixin.qq.com";}public int getReportWorkerNum() {return 1;}public int getReportBatchSize() {return 2;}public String getSpbillCreateIp() {// TODO Auto-generated method stubreturn "192.168.1.1";}
}
4. 配置类&＃xff1a;
apiclient_cert.p12的证书文件。这个证书文件你可以登录微信的商户平台。在这里去下载你所需要的证书。WXPayConfigImpl 在构造方法里面去读取这个文件&＃xff0c;所以构造方法抛了异常。因为构造器抛出异常&＃xff0c;所以这里没有采用静态内部类而是采用双检锁的方式去实现单例。回到WXService这个类中&＃xff0c;代码往下走&＃xff0c;在WXService的构造器中对config和wxpay进行了实例化。接下来同样是用双检锁的方式实现的单例。往下走&＃xff0c;微信的下单接口&＃xff0c;分别传入out_trade_no&＃xff08;外部订单号&＃xff09;&＃xff0c;body&＃xff08;商品描述&＃xff09;, money&＃xff08;付款金额&＃xff09;, applyNo&＃xff08;对应微信的product_id&＃xff1a;商品id&＃xff0c;由商户自定义&＃xff09;四个参数。进入方法后第一句话String amt &＃61; String.valueOf(money * 100);是把传入的钱数乘以100,并转换成字符串。这里之所以乘以100是因为微信那边会把我们传过去的钱数除以100得到应付金额&＃xff0c;且不能传小数&＃xff0c;所以下面的那一句amt.substring(0, amt.lastIndexOf(“.”)&＃xff09;就是为了把金额中的小数点去掉。往下走&＃xff0c;new出了一个hashmap,将参数传入hashmap中&＃xff0c;然后调用wxpay.unifiedOrder(data);下单接口下单。得到返回的map集合&＃xff0c;从map中获得的code_url这个参数就是微信返回给我们生成二维码的字符串。这样&＃xff0c;下单的整个流程就跑通了&＃xff0c;现在写个测试类来测试一下。package com.example.ffmpeg;public class MyTest {public static void main(String[] args) throws Exception {WXService wx &＃61; WXService.getInstance();String QRcode &＃61; wx.doUnifiedOrder("test001", "测试下单接口", 0.01, "a123456");System.out.println("得到的二维码是&＃xff1a;"&＃43;QRcode);}
}