10分钟完成微信JSAPI支付对接过程-JAVA后端接口

1. 引入架包

		
			com.github.javen205
			IJPay-WxPay
			${ijapy.version}
		

配置类

package com.joolun.web.config;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;

/**
 * 
微信配置 Bean
 *
 * @author yuhaiguang
 */
@Component
@PropertySource("classpath:/wxpay.properties")
@ConfigurationProperties(prefix = "wxpay")
public class WxPayBean {
	private String appId;
	private String appSecret;
	private String mchId;
	private String partnerKey;
	private String certPath;
	private String domain;

	public String getAppId() {
		return appId;
	}

	public void setAppId(String appId) {
		this.appId = appId;
	}

	public String getAppSecret() {
		return appSecret;
	}

	public void setAppSecret(String appSecret) {
		this.appSecret = appSecret;
	}

	public String getMchId() {
		return mchId;
	}

	public void setMchId(String mchId) {
		this.mchId = mchId;
	}

	public String getPartnerKey() {
		return partnerKey;
	}

	public void setPartnerKey(String partnerKey) {
		this.partnerKey = partnerKey;
	}

	public String getCertPath() {
		return certPath;
	}

	public void setCertPath(String certPath) {
		this.certPath = certPath;
	}

	public String getDomain() {
		return domain;
	}

	public void setDomain(String domain) {
		this.domain = domain;
	}

	@Override
	public String toString() {
		return "WxPayBean [appId=" + appId + ", appSecret=" + appSecret + ", mchId=" + mchId + ", partnerKey="
			+ partnerKey + ", certPath=" + certPath + ", domain=" + domain + "]";
	}
}

controller

AbstractWxPayApiController

package com.joolun.web.controller.weixin;

import com.ijpay.wxpay.WxPayApiConfig;

public abstract class AbstractWxPayApiController {

    public abstract WxPayApiConfig getApiConfig();
}

接口：

package com.joolun.web.controller.weixin;


import cn.hutool.core.util.StrUtil;
import com.alibaba.fastjson.JSON;
import com.baomidou.mybatisplus.extension.api.R;
import com.ijpay.core.enums.SignType;
import com.ijpay.core.enums.TradeType;
import com.ijpay.core.kit.IpKit;
import com.ijpay.core.kit.WxPayKit;
import com.ijpay.wxpay.WxPayApi;
import com.ijpay.wxpay.WxPayApiConfig;
import com.ijpay.wxpay.WxPayApiConfigKit;
import com.ijpay.wxpay.model.UnifiedOrderModel;
import com.joolun.common.core.domain.AjaxResult;
import com.joolun.web.config.WxPayBean;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

import javax.servlet.http.HttpServletRequest;
import java.util.Map;

@RestController
@RequestMapping("/wxPay")
public class WxPayController extends AbstractWxPayApiController{
    private final Logger log = LoggerFactory.getLogger(this.getClass());
    @Autowired
    private WxPayBean wxPayBean;

    private String notifyUrl;
    private String refundNotifyUrl;
    @Override
    public WxPayApiConfig getApiConfig() {
        WxPayApiConfig apiConfig;

        try {
            apiConfig = WxPayApiConfigKit.getApiConfig(wxPayBean.getAppId());
        } catch (Exception e) {
            apiConfig = WxPayApiConfig.builder()
                    .appId(wxPayBean.getAppId())
                    .mchId(wxPayBean.getMchId())
                    .partnerKey(wxPayBean.getPartnerKey())
                    .certPath(wxPayBean.getCertPath())
                    .domain(wxPayBean.getDomain())
                    .build();
        }
        notifyUrl = apiConfig.getDomain().concat("/wxPay/payNotify");
        refundNotifyUrl = apiConfig.getDomain().concat("/wxPay/refundNotify");
        return apiConfig;
    }


    @RequestMapping(value = "/webPay", method = {RequestMethod.POST, RequestMethod.GET})
    @ResponseBody
    public R webPay(HttpServletRequest request) {
        // openId，采用 网页授权获取 access_token API：SnsAccessTokenApi获取
        String openId = (String) request.getSession().getAttribute("openId");
        if (openId == null) {
            openId = "oQe4A6_acTpnPFTuAaxKq0Ss-yMo";
        }

        if (StrUtil.isEmpty(openId)) {
            return R.failed("openId is null");
        }

        String ip = IpKit.getRealIp(request);
        if (StrUtil.isEmpty(ip)) {
            ip = "127.0.0.1";
        }

        WxPayApiConfig wxPayApiConfig = WxPayApiConfigKit.getWxPayApiConfig();

        Map params = UnifiedOrderModel
                .builder()
                .appid(wxPayApiConfig.getAppId())
                .mch_id(wxPayApiConfig.getMchId())
                .nonce_str(WxPayKit.generateStr())
                .body("微信网页内测试")
                .attach("产品说名")
                .out_trade_no(WxPayKit.generateStr())
                .total_fee("1")
                .spbill_create_ip(ip)
                .notify_url(notifyUrl)
                .trade_type(TradeType.JSAPI.getTradeType())
                .openid(openId)
                .build()
                .createSign(wxPayApiConfig.getPartnerKey(), SignType.HMACSHA256);

        String xmlResult = WxPayApi.pushOrder(false, params);
        log.info(xmlResult);

        Map resultMap = WxPayKit.xmlToMap(xmlResult);
        String returnCode = resultMap.get("return_code");
        String returnMsg = resultMap.get("return_msg");
        if (!WxPayKit.codeIsOk(returnCode)) {
            return R.failed(returnMsg);
        }
        String resultCode = resultMap.get("result_code");
        if (!WxPayKit.codeIsOk(resultCode)) {
            return R.failed(returnMsg);
        }

        // 以下字段在 return_code 和 result_code 都为 SUCCESS 的时候有返回

        String prepayId = resultMap.get("prepay_id");

        Map packageParams = WxPayKit.prepayIdCreateSign(prepayId, wxPayApiConfig.getAppId(),
                wxPayApiConfig.getPartnerKey(), SignType.HMACSHA256);

        String jsonStr = JSON.toJSONString(packageParams);
        return R.failed(jsonStr);
    }


}

配置初始化拦截器

package com.joolun.web.config;

import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;

import com.joolun.web.interceptor.WxPayInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;

@Configuration
public class IJPayConfigurer extends WebMvcConfigurationSupport {
	@Override
	public void addInterceptors(InterceptorRegistry registry) {
		//registry.addInterceptor(new AliPayInterceptor()).addPathPatterns("/aliPay/**");
		registry.addInterceptor(new WxPayInterceptor()).addPathPatterns("/wxPay/**");
		super.addInterceptors(registry);
	}

	@Override
	public void addResourceHandlers(ResourceHandlerRegistry registry) {
		// 将所有/static/** 访问都映射到classpath:/static/ 目录下
		registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
	}

	@Override
	public void configureMessageConverters(List> converters) {
		super.configureMessageConverters(converters);

		FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();
		FastJsonConfig config = new FastJsonConfig();
		config.setSerializerFeatures(

			SerializerFeature.WriteMapNullValue, // 保留map空的字段

			SerializerFeature.WriteNullStringAsEmpty, // 将String类型的null转成""

			SerializerFeature.WriteNullNumberAsZero, // 将Number类型的null转成0

			SerializerFeature.WriteNullListAsEmpty, // 将List类型的null转成[]

			SerializerFeature.WriteNullBooleanAsFalse, // 将Boolean类型的null转成false

			SerializerFeature.DisableCircularReferenceDetect);// 避免循环引用

		converter.setFastJsonConfig(config);
		converter.setDefaultCharset(Charset.forName("UTF-8"));
		List mediaTypeList = new ArrayList<>();
		// 解决中文乱码问题，相当于在Controller上的@RequestMapping中加了个属性produces = "application/json"
		mediaTypeList.add(MediaType.APPLICATION_JSON);
		converter.setSupportedMediaTypes(mediaTypeList);
		converters.add(converter);

		converters.add(responseBodyConverter());
	}

	@Bean
	public HttpMessageConverter responseBodyConverter() {
		return new StringHttpMessageConverter(Charset.forName("UTF-8"));
	}
}

package com.joolun.web.interceptor;


import com.ijpay.wxpay.WxPayApiConfigKit;
import com.joolun.web.controller.weixin.AbstractWxPayApiController;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 
微信支付拦截器
 *
 * @author yuhaiguang
 */
public class WxPayInterceptor implements HandlerInterceptor {

	@Override
	public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object handler) {
		if (HandlerMethod.class.equals(handler.getClass())) {
			HandlerMethod method = (HandlerMethod) handler;
			Object controller = method.getBean();
			if (!(controller instanceof AbstractWxPayApiController)) {
				throw new RuntimeException("控制器需要继承 AbstractWxPayApiController");
			}
			WxPayApiConfigKit.setThreadLocalWxPayApiConfig(((AbstractWxPayApiController) controller).getApiConfig());
			return true;
		}
		return false;
	}
}

源码：

https://gitee.com/champion-myth/wx-shop/tree/dev-wx-pay/