JAVA微信公众号开发第11微信发红包

#简介
现金红包，是微信支付商户平台提供的营销工具之一，上线以来深受广大商户与用户的喜爱。商户可以通过本平台向微信支付用户发放现金红包。用户领取红包后，资金到达用户微信支付零钱账户，和零钱包的其他资金有一样的使用出口；若用户未领取，资金将会在24小时后退回商户的微信支付账户中。

微信支付api文档
PS:此功能需要用户申请微信商家支付，下载支付证书。

package com.lh.wx.service;

import okhttp3.*;
import okhttp3.internal.platform.Platform;
import org.apache.http.ssl.SSLContexts;

import com.lh.utils.common.DateUtils;
import com.lh.wx.model.SendRedPack;
import com.lh.wx.utils.Tool;

import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.X509TrustManager;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.*;
import java.security.cert.CertificateException;
import java.util.Date;
import java.util.TreeMap;


public class WeChatSendRedPack {


    public static void main(String[] args) throws Exception {
    	 String nonce_str = System.currentTimeMillis() + "";    
         // 设置订单号
  	   	String orderid ="1325860101"
  	   			+DateUtils.format(new Date(), "yyyyMMddHHmmss");

        //具体参数查看具体实体类，实体类中的的参数参考微信的红包发放接口，这里你直接用map，进行设置参数也可以。。。
        SendRedPack sendRedPack = new SendRedPack(
        		nonce_str,
        		orderid,
                "商户号",
                "公众号appid",
                "蓝海",
                "用户Openid",
                100,
                1,
                "恭喜发财",
                "127.0.0.1",
                "微信推广",
                "蓝海",
                "PRODUCT_5"
        );
        String content=sendRedPackage(sendRedPack);
        System.out.println(content);

    }
    @SuppressWarnings("unchecked")
	public static String sendRedPackage(SendRedPack sendRedPack)throws Exception{
    	 //将实体类转换为url形式
        String urlParamsByMap = Tool.getUrlParamsByMap(Tool.toMap(sendRedPack));
        //拼接我们再前期准备好的API密钥，前期准备第5条
        urlParamsByMap += "&key=支付key";
        //进行签名，需要说明的是，如果内容包含中文的话，要使用utf-8进行md5签名，不然会签名错误
        String sign = Tool.parseStrToMd5L32(urlParamsByMap).toUpperCase();
        sendRedPack.setSign(sign);
        //微信要求按照参数名ASCII字典序排序，这里巧用treeMap进行字典排序
        @SuppressWarnings("rawtypes")
		TreeMap treeMap = new TreeMap(Tool.toMap(sendRedPack));
        //然后转换成xml格式
        String soapRequestData = Tool.getSoapRequestData(treeMap);
        //发起请求前准备
        RequestBody body = RequestBody.create(MediaType.parse("text/xml;charset=UTF-8"), soapRequestData);
        Request request = new Request.Builder()
                .url("https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack")
                .post(body)
                .build();
        //为http请求设置证书
        SSLSocketFactory socketFactory = getSSL().getSocketFactory();
        X509TrustManager x509TrustManager = Platform.get().trustManager(socketFactory);
        OkHttpClient okHttpClient = new OkHttpClient.Builder().sslSocketFactory(socketFactory, x509TrustManager).build();
        //得到输出内容
        Response response = okHttpClient.newCall(request).execute();
        String content = response.body().string();
        return content;
    }
    public static SSLContext getSSL() throws KeyStoreException, IOException, CertificateException, NoSuchAlgorithmException, UnrecoverableKeyException, KeyManagementException {
        KeyStore keyStore = KeyStore.getInstance("PKCS12");
        //证书位置自己定义
        FileInputStream instream = new FileInputStream(new File("D:/soft/apiclient_cert.p12"));
        try {
            keyStore.load(instream, "商户号".toCharArray());
        } finally {
            instream.close();
        }
        SSLContext sslcontext = SSLContexts.custom()
                .loadKeyMaterial(keyStore, "商户号".toCharArray())
                .build();
        return sslcontext;
    }

}

#效果