java实现get/post请求

微信支付核心代码

PayUtil.java

package com.yaofang.utils;

import com.wechat.pay.contrib.apache.httpclient.WechatPayHttpClientBuilder;
import com.wechat.pay.contrib.apache.httpclient.auth.AutoUpdateCertificatesVerifier;
import com.wechat.pay.contrib.apache.httpclient.auth.PrivateKeySigner;
import com.wechat.pay.contrib.apache.httpclient.auth.WechatPay2Credentials;
import com.wechat.pay.contrib.apache.httpclient.auth.WechatPay2Validator;
import com.wechat.pay.contrib.apache.httpclient.util.PemUtil;
import com.yaofang.config.PayConfig;
import com.yaofang.pojo.Order;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;


import javax.sound.midi.Soundbank;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.PrivateKey;

/**
 * @author xzy
 * @create 2022/8/3 16:21
 */

@Component
public class PayUtil {

    @Autowired
    private PayConfig payConfig;

    private CloseableHttpClient httpClient;

    //证书加载相关
    public void setup(){
        System.out.println("payConfig: "+payConfig);
        // 加载商户私钥（privateKey：私钥字符串）
        PrivateKey merchantPrivateKey = null;
        try {
            merchantPrivateKey = PemUtil
                    .loadPrivateKey(new ByteArrayInputStream(payConfig.getPrivateKey().getBytes("utf-8")));
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        // 加载平台证书（mchId：商户号,mchSerialNo：商户证书序列号,apiV3Key：V3密钥）
        AutoUpdateCertificatesVerifier verifier = null;
        try {
            verifier = new AutoUpdateCertificatesVerifier(
                    new WechatPay2Credentials(payConfig.getMchid(), new PrivateKeySigner(payConfig.getMchSerialNo(), merchantPrivateKey)),payConfig.getApiV3Key().getBytes("utf-8"));
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        // 初始化httpClient
        httpClient = WechatPayHttpClientBuilder.create()
                .withMerchant(payConfig.getMchid(), payConfig.getMchSerialNo(), merchantPrivateKey)
                .withValidator(new WechatPay2Validator(verifier)).build();
    }


    public void after() throws IOException {
        httpClient.close();
    }

    public void CreateOrder(Order order) throws Exception{
        setup();
        HttpPost httpPost = new HttpPost("https://api.mch.weixin.qq.com/v3/pay/transactions/native");
        // 请求body参数
        String reqdata = "{"
                + "\"amount\": {"
                + "\"total\":"+order.getTotal()+","
                + "\"currency\":\""+order.getCurrency()+"\""
                + "},"
                + "\"mchid\":\""+order.getMchid()+"\","
                + "\"description\":\""+order.getDescription()+"\","
                + "\"notify_url\":\""+order.getNotify_url()+"\","
                + "\"out_trade_no\":\""+order.getOut_trade_no()+"\","
                + "\"appid\":\""+order.getAppid()+"\","
                + "}";
        StringEntity entity = new StringEntity(reqdata,"utf-8");
        entity.setContentType("application/json");
        httpPost.setEntity(entity);
        httpPost.setHeader("Accept", "application/json");

        //完成签名并执行请求
        CloseableHttpResponse response = httpClient.execute(httpPost);

        try {
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode == 200) { //处理成功
                System.out.println("success,return body = " + EntityUtils.toString(response.getEntity()));
            } else if (statusCode == 204) { //处理成功，无返回Body
                System.out.println("success");
            } else {
                System.out.println("failed,resp code = " + statusCode+ ",return body = " + EntityUtils.toString(response.getEntity()));
                throw new IOException("request failed");
            }
        } finally {
            response.close();
        }

        after();
    }

    public String QueryOrder(Order order) throws Exception {
        setup();
        //请求URL
        URIBuilder uriBuilder = new URIBuilder("https://api.mch.weixin.qq.com/v3/pay/transactions/out-trade-no/"+order.getOut_trade_no()+"?mchid="+order.getMchid());
        uriBuilder.setParameter("mchid", order.getMchid());

        //完成签名并执行请求
        HttpGet httpGet = new HttpGet(uriBuilder.build());
        httpGet.addHeader("Accept", "application/json");
        CloseableHttpResponse response = httpClient.execute(httpGet);

        String res = "";
        try {
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode == 200) {
                System.out.println("success,return body = " + EntityUtils.toString(response.getEntity()));
                res = EntityUtils.toString(response.getEntity());
            } else if (statusCode == 204) {
                System.out.println("success");
            } else {
                System.out.println("failed,resp code = " + statusCode+ ",return body = " + EntityUtils.toString(response.getEntity()));
                throw new IOException("request failed");
            }
        } finally {
            response.close();
        }

        after();
        return res;
    }

    public void CloseOrder(Order order) throws Exception {
        setup();
        //请求URL
        HttpPost httpPost = new HttpPost("https://api.mch.weixin.qq.com/v3/pay/transactions/out-trade-no/sdkphp12345678920201028112429/close");
        //请求body参数
        String reqdata ="{\"mchid\": \""+order.getMchid()+"\"}";

        StringEntity entity = new StringEntity(reqdata,"utf-8");
        entity.setContentType("application/json");
        httpPost.setEntity(entity);
        httpPost.setHeader("Accept", "application/json");

        //完成签名并执行请求
        CloseableHttpResponse response = httpClient.execute(httpPost);
        try {
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode == 200) {
                System.out.println("success,return body = " + EntityUtils.toString(response.getEntity()));
            } else if (statusCode == 204) {
                System.out.println("success");
            } else {
                System.out.println("failed,resp code = " + statusCode+ ",return body = " + EntityUtils.toString(response.getEntity()));
                throw new IOException("request failed");
            }
        } finally {
            response.close();
        }

        after();
    }

}

pom.xml

<!-- 微信支付API -->
<dependency>
	<groupId>com.github.wechatpay-apiv3</groupId>
	<artifactId>wechatpay-apache-httpclient</artifactId>
	<version>0.4.8</version>
</dependency>