java开发微信公众号支付

java开发微信公众号支付

因此我们必须去获取openid，同时也可以处理一些我们需要的逻辑。获取用户授权有两种方式:1.scope=snsapi_base;2.scope=snsapi_userinfo.我使用的是snsapi_base

Scope为snsapi_base

https://open.weixin.qq.com/connect/oauth2/authorize?appid=wx520c15f417810387&redirect_uri=http%3A%2F%2Fchong.qq.com%2Fphp%2Findex.php%3Fd%3D%26c%3DwxAdapter%26m%3DmobileDeal%26showwxpaytitle%3D1%26vb2ctag%3D4_2030_5_1194_60&response_type=code&scope=snsapi_base&state=123#wechat_redirect

Scope为snsapi_userinfo

https://open.weixin.qq.com/connect/oauth2/authorize?appid=wxf0e81c3bee622d60&redirect_uri=http%3A%2F%2Fnba.bluewebgame.com%2Foauth_response.php&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect

//获取openId

HttpClientUtil util = HttpClientUtil.getInstance();

Map map = new HashMap();

map.put("appid", WxPayConfig.APPID);

map.put("secret", WxPayConfig.APPSECRET);

map.put("code", code);

map.put("grant_type", WxPayConfig.GRANT_TYPE);

String returnStr = util.doPostRetString("https://api.weixin.qq.com/sns/oauth2/access_token", null,map);

logger.info("returnStr:[" + returnStr + "]");

AccessToken at = JSON.parseObject(returnStr, AccessToken.class);

AccessToken.java

public class AccessToken {

private String access_token;

private String expires_in;

private String refresh_token;

private String openid;

private String scope;

private String unionid;

public String getAccess_token() {

return access_token;

}

public void setAccess_token(String access_token) {

this.access_token = access_token;

}

public String getExpires_in() {

return expires_in;

}

public void setExpires_in(String expires_in) {

this.expires_in = expires_in;

}

public String getRefresh_token() {

return refresh_token;

}

public void setRefresh_token(String refresh_token) {

this.refresh_token = refresh_token;

}

public String getOpenid() {

return openid;

}

public void setOpenid(String openid) {

this.openid = openid;

}

public String getScope() {

return scope;

}

public void setScope(String scope) {

this.scope = scope;

}

public String getUnionid() {

return unionid;

}

public void setUnionid(String unionid) {

this.unionid = unionid;

}

@Override

public String toString() {

return "AccessToken [access_token=" + access_token + ", expires_in="

+ expires_in + ", refresh_token=" + refresh_token + ", openid="

+ openid + ", scope=" + scope + ", unionid=" + unionid + "]";

}

}

二    我们获取了openid后，就可以进行下一步的统一下单的开发了。微信上统一下单接口的文档写的比较详细了，具体的参数含义我就不多做介绍了。下面直接贴最直观的代码，特别提醒的是一定要注意签名的正确。签名所使用的key并不是AppSecret而是你申请时自己定义的商户key。

//统一下单

WxPaySendData data = new WxPaySendData();

data.setAppid(WxPayConfig.APPID);

data.setAttach("微信支付");

data.setMch_id(WxPayConfig.MCHID);

data.setNonce_str(nonceStr);

data.setNotify_url(WxPayConfig.NOTIFY_URL);

data.setOut_trade_no(tradeNo);

data.setTotal_fee((int)(fee*100));//单位：分

data.setTrade_type("JSAPI");

data.setSpbill_create_ip(ip);

data.setOpenid(at.getOpenid());

String returnXml = UnifiedorderService.unifiedOrder(data,WxPayConfig.KEY);

WxPayReturnData reData = new WxPayReturnData();

XStream xs1 = new XStream(new DomDriver());

xs1.alias("xml", WxPayReturnData.class);

reData = (WxPayReturnData) xs1.fromXML(returnXml);

UnifiedorderService.java

public class UnifiedorderService {

private final static Logger logger = LoggerFactory.getLogger(UnifiedorderService.class);

public static String unifiedOrder(WxPaySendData data,String key){

//统一下单支付

String returnXml = null;

try {

//生成sign签名

SortedMap

parameters.put("appid", data.getAppid());

parameters.put("attach", data.getAttach());

parameters.put("body", data.getBody());

parameters.put("mch_id", data.getMch_id());

parameters.put("nonce_str", data.getNonce_str());

parameters.put("notify_url", data.getNotify_url());

parameters.put("out_trade_no", data.getOut_trade_no());

parameters.put("total_fee", data.getTotal_fee());

parameters.put("trade_type", data.getTrade_type());

parameters.put("spbill_create_ip", data.getSpbill_create_ip());

parameters.put("openid", data.getOpenid());

parameters.put("device_info", data.getDevice_info());

logger.info("SIGN:"+WxSign.createSign(parameters,key));

data.setSign(WxSign.createSign(parameters,key));

XStream xs = new XStream(new DomDriver("UTF-8",new XmlFriendlyNameCoder("-_", "_")));

xs.alias("xml", WxPaySendData.class);

String xml = xs.toXML(data);

logger.info("统一下单xml为:\n" + xml);

HttpClientUtil util = HttpClientUtil.getInstance();

returnXml = util.doPostForString("https://api.mch.weixin.qq.com/pay/unifiedorder", null, xml);

logger.info("返回结果:" + returnXml);

} catch (Exception e) {

e.printStackTrace();

}

return returnXml;

}

}

WxSign

public class WxSign {

private static String characterEncoding = "UTF-8";

@SuppressWarnings("rawtypes")

public static String createSign(SortedMap

StringBuffer sb = new StringBuffer();

Set es = parameters.entrySet();//所有参与传参的参数按照accsii排序（升序）

Iterator it = es.iterator();

while(it.hasNext()) {

Map.Entry entry = (Map.Entry)it.next();

String k = (String)entry.getKey();

Object v = entry.getValue();

if(null != v && !"".equals(v)

&& !"sign".equals(k) && !"key".equals(k)) {

sb.append(k + "=" + v + "&");

}

}

sb.append("key=" + key);

String sign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toUpperCase();

return sign;

}

public static String getNonceStr() {

Random random = new Random();

return MD5Util.MD5Encode(String.valueOf(random.nextInt(10000)), "UTF-8");

}

public static String getTimeStamp() {

return String.valueOf(System.currentTimeMillis() / 1000);

}

}

最后要提一下的是NOTIFY_URL回调地址，接收微信支付异步通知回调地址。

三    通过上面的操作我们获得了预支付交易会话标识prepay_id，这样我们就可以进行最后一步的操作了。使用H5调起支付api。

//H5调起支付

attr.addAttribute("appId", reData.getAppid());

attr.addAttribute("timeStamp", WxSign.getTimeStamp());

attr.addAttribute("nonceStr", reData.getNonce_str());

attr.addAttribute("package", "prepay_id="+reData.getPrepay_id());

attr.addAttribute("signType", "MD5");

SortedMap

signMap.put("appId", reData.getAppid());

signMap.put("timeStamp", WxSign.getTimeStamp());

signMap.put("nonceStr", reData.getNonce_str());

signMap.put("package", "prepay_id="+reData.getPrepay_id());

signMap.put("signType", "MD5");

logger.info("PaySIGN:"+WxSign.createSign(signMap,WxPayConfig.KEY));

attr.addAttribute("paySign", WxSign.createSign(signMap,WxPayConfig.KEY));

将需要的参数传给页面后，使用微信提供方法调起支付。

在返回结果的地方可以自定义一些自己的返回页面。

总结：由于我也是第一次做，写这篇文章是想记录一下自己的工作成果，和分享给一下也是新手的朋友们可以有一些帮助，最后希望有好的见解朋友可以留言讨论，大家一起学习进步。

以上就是关于java开发微信公众支付的所有内容了，希望大家能够喜欢。

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