Java 使用微信支付
前言百度搜了一下微信支付，都描述的不太好，于是乎打算自己写一个案例，希望以后拿来直接改造使用。
因为涉及二维码的前端显示，所以有前端的内容
一. 准备工作
所需微信公众号信息配置
我这个案例用的是尚硅谷一位老师提供的，这里不方便提供出来，需要大家自己找，或者公司提供
二. 构建项目架构
1.新建maven项目
2.导入依赖
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.2.1.RELEASE</version> </parent> <dependencies> <!--spring boot --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!--微信提供的sdk--> <dependency> <groupId>com.github.wxpay</groupId> <artifactId>wxpay-sdk</artifactId> <version>0.0.3</version> </dependency> <!--发送http请求--> <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> </dependency> <!--模板引擎--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-freemarker</artifactId> </dependency> </dependencies>
依赖中需要注意的是我导入了微信提供的sdk，以及freemarker模板引擎
3.编写配置文件application.properties
# 服务端口 server.port=8081 # 微信开放平台 appid wx.pay.app_id= #商户号 wx.pay.partner= #商户key wx.pay.partnerkey= #回调地址 wx.pay.notifyurl: spring.freemarker.tempalte-loader-path=classpath:/templates # 关闭缓存，及时刷新，上线生产环境需要修改为true spring.freemarker.cache=false spring.freemarker.charset=UTF-8 spring.freemarker.check-template-location=true spring.freemarker.content-type=text/html spring.freemarker.expose-request-attributes=true spring.freemarker.expose-session-attributes=true spring.freemarker.request-context-attribute=request spring.freemarker.suffix=.ftl spring.mvc.static-path-pattern: /static/**
4.编写启动类
@SpringBootApplication
@ComponentScan(basePackages = {"com.haiyang.wxpay"})
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
5.创建常用包controller，service，impl，utils
6.创建两个前端需要的文件夹 static和templates
三. 代码实现
1. 创建工具类读取配置文件的参数
@Component
public class WxPayUtils implements InitializingBean {
@Value("${wx.pay.app_id}")
private String appId;
@Value("${wx.pay.partner}")
private String partner;
@Value("${wx.pay.partnerkey}")
private String partnerKey;
@Value("${wx.pay.notifyurl}")
private String notifyUrl;
public static String WX_PAY_APP_ID;
public static String WX_PAY_PARTNER;
public static String WX_PAY_PARTNER_KEY;
public static String WX_OPEN_NOTIFY_URL;
@Override
public void afterPropertiesSet() throws Exception {
WX_PAY_APP_ID = appId;
WX_PAY_PARTNER = partner;
WX_PAY_PARTNER_KEY = partnerKey;
WX_OPEN_NOTIFY_URL = notifyUrl;
}
}
2. 构建工具类发送http请求
/**
* http请求客户端
*
* @author qy
*
*/
public class HttpClient {
private String url;
private Map<String, String> param;
private int statusCode;
private String content;
private String xmlParam;
private boolean isHttps;
public boolean isHttps() {
return isHttps;
}
public void setHttps(boolean isHttps) {
this.isHttps = isHttps;
}
public String getXmlParam() {
return xmlParam;
}
public void setXmlParam(String xmlParam) {
this.xmlParam = xmlParam;
}
public HttpClient(String url, Map<String, String> param) {
this.url = url;
this.param = param;
}
public HttpClient(String url) {
this.url = url;
}
public void setParameter(Map<String, String> map) {
param = map;
}
public void addParameter(String key, String value) {
if (param == null)
param = new HashMap<String, String>();
param.put(key, value);
}
public void post() throws ClientProtocolException, IOException {
HttpPost http = new HttpPost(url);
setEntity(http);
execute(http);
}
public void put() throws ClientProtocolException, IOException {
HttpPut http = new HttpPut(url);
setEntity(http);
execute(http);
}
public void get() throws ClientProtocolException, IOException {
if (param != null) {
StringBuilder url = new StringBuilder(this.url);
boolean isFirst = true;
for (String key : param.keySet()) {
if (isFirst)
url.append("?");
else
url.append("&");
url.append(key).append("=").append(param.get(key));
}
this.url = url.toString();
}
HttpGet http = new HttpGet(url);
execute(http);
}
/**
* set http post,put param
*/
private void setEntity(HttpEntityEnclosingRequestBase http) {
if (param != null) {
List<NameValuePair> nvps = new LinkedList<NameValuePair>();
for (String key : param.keySet())
nvps.add(new BasicNameValuePair(key, param.get(key))); // 参数
http.setEntity(new UrlEncodedFormEntity(nvps, Consts.UTF_8)); // 设置参数
}
if (xmlParam != null) {
http.setEntity(new StringEntity(xmlParam, Consts.UTF_8));
}
}
private void execute(HttpUriRequest http) throws ClientProtocolException,
IOException {
CloseableHttpClient httpClient = null;
try {
if (isHttps) {
SSLContext sslContext = new SSLContextBuilder()
.loadTrustMaterial(null, new TrustStrategy() {
// 信任所有
public boolean isTrusted(X509Certificate[] chain,
String authType)
throws CertificateException {
return true;
}
}).build();
SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(
sslContext);
httpClient = HttpClients.custom().setSSLSocketFactory(sslsf)
.build();
} else {
httpClient = HttpClients.createDefault();
}
CloseableHttpResponse response = httpClient.execute(http);
try {
if (response != null) {
if (response.getStatusLine() != null)
statusCode = response.getStatusLine().getStatusCode();
HttpEntity entity = response.getEntity();
// 响应内容
content = EntityUtils.toString(entity, Consts.UTF_8);
}
} finally {
response.close();
}
} catch (Exception e) {
e.printStackTrace();
} finally {
httpClient.close();
}
}
public int getStatusCode() {
return statusCode;
}
public String getContent() throws ParseException, IOException {
return content;
}
}
额~有点长就不放图片了 代码都一样
3. 新建controller
@Controller
@RequestMapping("/wxpay")
public class WxPayController {
@RequestMapping("/pay")
public String createPayQRcode(Model model) throws Exception{
String price = "0.01";
String no = getOrderNo();
Map m = new HashMap();
m.put("appid", WxPayUtils.WX_PAY_APP_ID);
m.put("mch_id", WxPayUtils.WX_PAY_PARTNER);
m.put("nonce_str", WXPayUtil.generateNonceStr());
m.put("body","微信支付测试"); //主体信息
m.put("out_trade_no", no); //订单唯一标识
m.put("total_fee", getMoney(price));//金额
m.put("spbill_create_ip", "127.0.0.1");//项目的域名
m.put("notify_url", WxPayUtils.WX_OPEN_NOTIFY_URL);//回调地址
m.put("trade_type", "NATIVE");//生成二维码的类型
//3 发送httpclient请求，传递参数xml格式，微信支付提供的固定的地址
HttpClient client = new HttpClient("https://api.mch.weixin.qq.com/pay/unifiedorder");
//设置xml格式的参数
//把xml格式的数据加密
client.setXmlParam(WXPayUtil.generateSignedXml(m, WxPayUtils.WX_PAY_PARTNER_KEY));
client.setHttps(true);
//执行post请求发送
client.post();
//4 得到发送请求返回结果
//返回内容，是使用xml格式返回
String xml = client.getContent();
//把xml格式转换map集合，把map集合返回
Map<String,String> resultMap = WXPayUtil.xmlToMap(xml);
//最终返回数据 的封装
Map map = new HashMap();
map.put("no", no);
map.put("price", price);
map.put("result_code", resultMap.get("result_code"));
map.put("code_url", resultMap.get("code_url"));
model.addAttribute("map",map);
return "pay";
}
@GetMapping("queryorder/{no}")
@ResponseBody
public String queryPayStatus(@PathVariable String no) throws Exception{
//1、封装参数
Map m = new HashMap<>();
m.put("appid", WxPayUtils.WX_PAY_APP_ID);
m.put("mch_id", WxPayUtils.WX_PAY_PARTNER);
m.put("out_trade_no", no);
m.put("nonce_str", WXPayUtil.generateNonceStr());
//2 发送httpclient
HttpClient client = new HttpClient("https://api.mch.weixin.qq.com/pay/orderquery");
client.setXmlParam(WXPayUtil.generateSignedXml(m, WxPayUtils.WX_PAY_PARTNER_KEY));
client.setHttps(true);
client.post();
//3.得到订单数据
String xml = client.getContent();
Map<String, String> resultMap = WXPayUtil.xmlToMap(xml);
//4.判断是否支付成功
if(resultMap.get("trade_state").equals("SUCCESS")) {
/*
改变数据库中的数据等操作
*/
return "支付成功";
}
return "支付中";
}
@GetMapping("success")
public String success(){
return "success";
}
@RequestMapping("test")
public String test(){
return "pay";
}
/**
* 生成订单号
* @return
*/
public static String getOrderNo() {
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
String newDate = sdf.format(new Date());
String result = "";
Random random = new Random();
for (int i = 0; i < 3; i++) {
result += random.nextInt(10);
}
return newDate + result;
}
/**
* 元转换成分
* @param amount
* @return
*/
public static String getMoney(String amount) {
if(amount==null){
return "";
}
// 金额转化为分为单位
// 处理包含, ￥ 或者$的金额
String currency = amount.replaceAll("\\$|\\￥|\\,", "");
int index = currency.indexOf(".");
int length = currency.length();
Long amLong = 0l;
if(index == -1){
amLong = Long.valueOf(currency+"00");
}else if(length - index >= 3){
amLong = Long.valueOf((currency.substring(0, index+3)).replace(".", ""));
}else if(length - index == 2){
amLong = Long.valueOf((currency.substring(0, index+2)).replace(".", "")+0);
}else{
amLong = Long.valueOf((currency.substring(0, index+1)).replace(".", "")+"00");
}
return amLong.toString();
}
}
值得一提的是 这里我们用的是controller而不是restcontroller，因为我们需要展示二维码
4. 在templates文件中新建 订单支付页面（二维码生成的页面）
注意：文件名必须和生成二维码方法中返回的字符串名称一样 我这里叫 pay
先新建html页面，然后再将后缀改成ftl（freemarker模板引擎的后缀名）
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="/static/qrcode.js"></script>
<script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.js"></script>
</head>
<center>
<div id="qrcode"></div>
</center>
<script type="text/javascript">
new QRCode(document.getElementById("qrcode"), "${map.code_url}"); // 设置要生成二维码的链接
</script>
<script type="text/javascript">
var int=self.setInterval("querystatus()",3000);
function querystatus() {
$.get("/wxpay/queryorder/${map.no}",function(data,status){
if (data==="支付中"){
console.log("支付中");
} else {
clearInterval(int)
window.location.href="/wxpay/success" rel="external nofollow"
}
})
}
</script>
</body>
</html>
再创建支付成功跳转的页面 文件名要与支付成功方法返回的文件名一样
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <h1>支付成功</h1> </body> </html>
引入 qrcode 生成二维码的依赖，放入static文件中
这里我提供下载链接
链接: https://pan.baidu.com/s/15-E3KpRCenAewh0ZaBLnjQ 提取码: xhs9 复制这段内容后打开百度网盘手机App，操作更方便哦
引入完成后
最后 我们启动项目来测试一下
浏览器输入地址
http://localhost:8081/wxpay/pay
发现二维码生成成功，并且定时器也没问题
之后我们扫码支付
成功跳转到支付成功页面 ~nice
四. 总结
实际项目中远没有这么简单，并且所有的数据都要从数据库中获取，在这里我为了方便把价格固定写死的
