Java微信开发之现金红包接口

首先，商户调用微信红包接口时，服务器会进行证书验证，所以要在商户平台下载证书。在管理后台的“账户信息”里找到“安全设置”就可以下载了证书了。

商户平台：https://pay.weixin.qq.com

我们把下载好的证书解压放到目录D:/certs下。SSL接口中使用到这些证书。

接着就是向帐号中充值，因为发放现金红包将扣除商户的可用余额，所以需要预先充值，确保可用余额充足。进入“资金管理”菜单找到“现金管理”，在此进行充值，保证帐号有余额可以进行红包发放。

3、业务代码 3.1红包实体类

package com.benben.timetable.wechat.entity;

 * 现金红包

 * @ClassName: SendRedPack

 * @Description: TODO

 * @author 潘广伟(笨笨)

 * @date 2015年12月11日

public class SendRedPack {

 private String nonce_str;// 随机字符串

 private String sign;// 签名

 private String mch_billno;// 商户订单号

 private String mch_id;// 商户号

 private String wxappid;// 公众账号

 private String send_name;// 商户名称

 private String re_openid;// 用户

 private int total_amount;// 付款金额

 private int total_num;// 红包发放总人数

 private String wishing;// 红包祝福语

 private String client_ip;// Ip地址

 private String act_name;// 活动名称

 private String remark;// 备注

 public int getTotal_amount() {

 return total_amount;

 public void setTotal_amount(int total_amount) {

 this.total_amount = total_amount;

 public int getTotal_num() {

 return total_num;

 public void setTotal_num(int total_num) {

 this.total_num = total_num;

 public String getNonce_str() {

 return nonce_str;

 public void setNonce_str(String nonce_str) {

 this.nonce_str = nonce_str;

 public String getSign() {

 return sign;

 public void setSign(String sign) {

 this.sign = sign;

 public String getMch_billno() {

 return mch_billno;

 public void setMch_billno(String mch_billno) {

 this.mch_billno = mch_billno;

 public String getMch_id() {

 return mch_id;

 public void setMch_id(String mch_id) {

 this.mch_id = mch_id;

 public String getWxappid() {

 return wxappid;

 public void setWxappid(String wxappid) {

 this.wxappid = wxappid;

 public String getSend_name() {

 return send_name;

 public void setSend_name(String send_name) {

 this.send_name = send_name;

 public String getRe_openid() {

 return re_openid;

 public void setRe_openid(String re_openid) {

 this.re_openid = re_openid;

 public String getWishing() {

 return wishing;

 public void setWishing(String wishing) {

 this.wishing = wishing;

 public String getClient_ip() {

 return client_ip;

 public void setClient_ip(String client_ip) {

 this.client_ip = client_ip;

 public String getAct_name() {

 return act_name;

 public void setAct_name(String act_name) {

 this.act_name = act_name;

 public String getRemark() {

 return remark;

 public void setRemark(String remark) {

 this.remark = remark;

再次吐槽微信的xml格式。下划线啊！！！

 public String createSendRedPackOrderSign(SendRedPack redPack){

 StringBuffer sign = new StringBuffer();

 sign.append("act_name=").append(redPack.getAct_name());

 sign.append(" client_ip=").append(redPack.getClient_ip());

 sign.append(" mch_billno=").append(redPack.getMch_billno());

 sign.append(" mch_id=").append(redPack.getMch_id());

 sign.append(" nonce_str=").append(redPack.getNonce_str());

 sign.append(" re_openid=").append(redPack.getRe_openid());

 sign.append(" remark=").append(redPack.getRemark());

 sign.append(" send_name=").append(redPack.getSend_name());

 sign.append(" total_amount=").append(redPack.getTotal_amount());

 sign.append(" total_num=").append(redPack.getTotal_num());

 sign.append(" wishing=").append(redPack.getWishing());

 sign.append(" wxappid=").append(redPack.getWxappid());

 sign.append(" key=").append(payKey);

 return DigestUtils.md5Hex(sign.toString()).toUpperCase();

 }

签名算法请参考：https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=4_3
之前微信支付也用到相同的签名方式：http://blog.csdn.net/jrainbow/article/details/49904065

private String ssl(String url,String data){

 StringBuffer message = new StringBuffer();

 try {

 KeyStore keyStore = KeyStore.getInstance("PKCS12");

 FileInputStream instream = new FileInputStream(new File("D:/certs/apiclient_cert.p12"));

 keyStore.load(instream, mchId.toCharArray());

 // Trust own CA and all self-signed certs

 SSLContext sslcontext = SSLContexts.custom()

 .loadKeyMaterial(keyStore, mchId.toCharArray())

 .build();

 // Allow TLSv1 protocol only

 SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(

 sslcontext,

 new String[] { "TLSv1" },

 null,

 SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER);

 CloseableHttpClient httpclient = HttpClients.custom()

 .setSSLSocketFactory(sslsf)

 .build();

 HttpPost httpost = new HttpPost(url);

 httpost.addHeader("Connection", "keep-alive");

 httpost.addHeader("Accept", "*/*");

 httpost.addHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");

 httpost.addHeader("Host", "api.mch.weixin.qq.com");

 httpost.addHeader("X-Requested-With", "XMLHttpRequest");

 httpost.addHeader("Cache-Control", "max-age=0");

 httpost.addHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0) ");

 httpost.setEntity(new StringEntity(data, "UTF-8"));

 System.out.println("executing request" + httpost.getRequestLine());

 CloseableHttpResponse response = httpclient.execute(httpost);

 try {

 HttpEntity entity = response.getEntity();

 System.out.println("----------------------------------------");

 System.out.println(response.getStatusLine());

 if (entity != null) {

 System.out.println("Response content length: " + entity.getContentLength());

 BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(entity.getContent(),"UTF-8"));

 String text;

 while ((text = bufferedReader.readLine()) != null) {

 message.append(text);

 EntityUtils.consume(entity);

 } catch (IOException e) {

 e.printStackTrace();

 } finally {

 response.close();

 } catch (Exception e1) {

 e1.printStackTrace();

 return message.toString();

 }

注意：微信本身提供的demo中的ssl程序是不正确的。

public Map String, String sendRedPack(SendRedPack redPack) throws Exception{ String sign = createSendRedPackOrderSign(redPack); redPack.setSign(sign); xmlUtil.xstream().alias("xml", redPack.getClass()); String xml = xmlUtil.xstream().toXML(redPack); String response = ssl(sendEedPackUrl,xml); Map String, String responseMap = xmlUtil.parseXml(response); return responseMap; }
java接口总结 接口声明：interface 接口的名字 接口体：接口体中包含常量的声明（没有变量）和抽象方法（没有普通方法）两部分。