微信H5支付开发(maven仓库版）

官方文档：https://pay.weixin.qq.com/wiki/doc/api/H5.php?chapter=15_1

开发之前确认开通了H5支付功能

一、安装微信sdk

二、创建config类

package com.xiuchefang.config;

import com.github.wxpay.sdk.WXPayConfig;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;

/**
 * Created by 15117 on 2018/11/27.
 */
public class XCFWXPayConfig implements WXPayConfig {

    private byte[] certData;

    public XCFWXPayConfig() throws Exception {
        String certPath = "***";
        File file = new File(certPath);
        InputStream stream = new FileInputStream(file);
        this.certData = new byte[(int)file.length()];
        stream.read(this.certData);
        stream.close();
    }

    @Override
    public String getAppID() {
        return "***";
    }

    @Override
    public String getMchID() {
        return "***";
    }

    @Override
    public String getKey() {
        return "***";
    }

    @Override
    public InputStream getCertStream() {
        return new ByteArrayInputStream(this.certData);
    }

    @Override
    public int getHttpConnectTimeoutMs() {
        return 8000;
    }

    @Override
    public int getHttpReadTimeoutMs() {
        return 10000;
    }
}

三、调用微信支付接口下单

　　

　　用户ip获取　　

　（1）微信用户ip获取指引：https://pay.weixin.qq.com/wiki/doc/api/H5.php?chapter=15_5

　（2）代码获取ip指引：https://www.cnblogs.com/SongG-blogs/p/9083512.html

*注意抽象方法作用域

　　

　　支付签名错误排产方法

　　1、确认公众号的appSecret和商户号的API密钥没有搞混。

　　2、重置商户API密钥（注意项目中记得更新api密钥）

　　3、确认公众号授权的域名和目录是正确的

　　　针对redirect_url处理

　　

　　前台进行页面跳转

支付成功之后处理，微信请求notify_url

@Override
    public synchronized void payNotify(HttpServletRequest request, HttpServletResponse response) {

        System.out.println("微信支付回调");
        try {
            String resXml = "";
            XCFWXPayConfig xcfwxPayConfig = new XCFWXPayConfig();
            WXPay wxPay = new WXPay(xcfwxPayConfig);

            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");// 获取微信调用我们notify_url的返回信息
            Map<String, String> map = WXPayUtil.xmlToMap(result);

            if (wxPay.isPayResultNotifySignatureValid(map)) {
                System.out.println("微信支付-签名验证成功");
                resXml = "<xml>" + "<return_code><![CDATA[SUCCESS]]></return_code>"
                        + "<return_msg><![CDATA[OK]]></return_msg>" + "</xml> ";
                //业务处理开始

                //业务处理结束
            }
            BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());
            out.write(resXml.getBytes());
            out.flush();
            out.close();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

其它常见错误解决办法（https://pay.weixin.qq.com/wiki/doc/api/H5.php?chapter=15_4）